RM38T0EC _59 Vehicle Exterior _112294 LIGHTING (EXT) _0510962 LIGHTING SYSTEM J

LIGHTING (EXT)  LIGHTING SYSTEM  LO-beam Headlight does not Illuminate  


DESCRIPTION

The main body ECU (multiplex network body ECU) controls the low beam headlights.

WIRING DIAGRAM

for LED Headlight


E449528E04
1.052,0.5 2.885,0.698 1.833,0.198 10 false from Auxiliary Battery 0.688,1.177 2.521,1.375 1.833,0.198 10 false H-LP LH 2.094,1.594 2.74,1.844 0.646,0.25 10 false H-LP LH 2.073,3.063 2.719,3.313 0.646,0.25 10 false H-LP RH 0.708,2.635 1.354,2.885 0.646,0.25 10 false H-LP RH 4.281,2.854 4.927,3.104 0.646,0.25 10 false 8E 4.021,0.885 4.667,1.135 0.646,0.25 10 false 6 2.635,0.885 2.833,1.094 0.198,0.208 10 false 1 1.99,0.906 2.188,1.115 0.198,0.208 10 false 2 1.969,1.208 2.167,1.417 0.198,0.208 10 false 5 2.646,1.177 2.844,1.385 0.198,0.208 10 false 3 5.719,0.813 6.365,1.063 0.646,0.25 10 false 8 5.667,1 6.021,1.229 0.354,0.229 10 false MB 6.083,0.906 6.729,1.156 0.646,0.25 10 false HRLY 2.615,3.677 3.26,3.927 0.646,0.25 10 false LO 1.885,4.094 2.531,4.344 0.646,0.25 10 false E 1.844,4.458 2.427,4.708 0.583,0.25 10 false A175 2.625,5.521 3.271,5.771 0.646,0.25 10 false LO 1.885,5.885 2.531,6.135 0.646,0.25 10 false E 1.813,6.271 2.271,6.479 0.458,0.208 10 false A176 1.823,4.635 3.771,4.958 1.948,0.323 10 false Headlight Assembly RH 1.958,2.677 2.156,2.885 0.198,0.208 10 false 5 1.948,2.344 2.146,2.552 0.198,0.208 10 false 2 2.656,2.615 2.854,2.823 0.198,0.208 10 false 3 2.646,2.354 2.844,2.563 0.198,0.208 10 false 1 6.042,2.365 6.688,2.615 0.646,0.25 10 false HRY2 5.427,4.531 7.073,5.021 1.646,0.49 10 false Main Body ECU (Multiplex Network Body ECU) 4.281,3.021 5.76,3.469 1.479,0.448 10 false Power Distribution Box Assembly 2.938,3.583 3.135,3.802 0.198,0.219 10 false 4 1.667,4 1.844,4.198 0.177,0.198 10 false 2 2.938,5.385 3.135,5.594 0.198,0.208 10 false 4 1.677,5.76 1.813,5.958 0.135,0.198 10 false 2 1.031,1.938 2.865,2.135 1.833,0.198 10 false from Auxiliary Battery 3.969,2.344 4.615,2.594 0.646,0.25 10 false 10 5.708,2.25 5.927,2.438 0.219,0.188 10 false 9 5.667,2.458 6.021,2.688 0.354,0.229 10 false MB 1.813,6.458 3.76,6.781 1.948,0.323 10 false Headlight Assembly LH 0.104,0.063 1.938,0.26 1.833,0.198 12 false for TFTM Made:

E449528E05
1.052,0.5 2.885,0.698 1.833,0.198 10 false from Auxiliary Battery 0.688,1.177 2.521,1.375 1.833,0.198 10 false H-LP LH 2.094,1.594 2.74,1.844 0.646,0.25 10 false H-LP LH 2.073,3.063 2.719,3.313 0.646,0.25 10 false H-LP RH 0.708,2.635 1.354,2.885 0.646,0.25 10 false H-LP RH 4.281,2.854 4.927,3.104 0.646,0.25 10 false 8E 4.021,0.885 4.667,1.135 0.646,0.25 10 false 6 2.635,0.885 2.833,1.094 0.198,0.208 10 false 1 1.99,0.906 2.188,1.115 0.198,0.208 10 false 2 1.969,1.208 2.167,1.417 0.198,0.208 10 false 5 2.646,1.177 2.844,1.385 0.198,0.208 10 false 3 5.719,0.813 6.365,1.063 0.646,0.25 10 false 8 5.667,1 6.021,1.229 0.354,0.229 10 false MB 6.083,0.906 6.729,1.156 0.646,0.25 10 false HRLY 2.615,3.677 3.26,3.927 0.646,0.25 10 false LO 1.885,4.094 2.531,4.344 0.646,0.25 10 false E 1.844,4.458 2.427,4.708 0.583,0.25 10 false A175 2.625,5.521 3.271,5.771 0.646,0.25 10 false LO 1.885,5.885 2.531,6.135 0.646,0.25 10 false E 1.813,6.271 2.271,6.479 0.458,0.208 10 false A176 1.823,4.635 3.771,4.958 1.948,0.323 10 false Headlight Assembly RH 1.958,2.677 2.156,2.885 0.198,0.208 10 false 5 1.948,2.344 2.146,2.552 0.198,0.208 10 false 2 2.656,2.615 2.854,2.823 0.198,0.208 10 false 3 2.646,2.354 2.844,2.563 0.198,0.208 10 false 1 6.042,2.365 6.688,2.615 0.646,0.25 10 false HRY2 5.427,4.531 7.073,5.021 1.646,0.49 10 false Main Body ECU (Multiplex Network Body ECU) 4.281,3.021 5.76,3.469 1.479,0.448 10 false Power Distribution Box Assembly 2.938,3.583 3.135,3.802 0.198,0.219 10 false 4 1.667,4 1.844,4.198 0.177,0.198 10 false 6 2.938,5.385 3.135,5.594 0.198,0.208 10 false 4 1.677,5.76 1.813,5.958 0.135,0.198 10 false 6 1.031,1.938 2.865,2.135 1.833,0.198 10 false from Auxiliary Battery 3.969,2.344 4.615,2.594 0.646,0.25 10 false 10 5.708,2.25 5.927,2.438 0.219,0.188 10 false 9 5.667,2.458 6.021,2.688 0.354,0.229 10 false MB 1.813,6.458 3.76,6.781 1.948,0.323 10 false Headlight Assembly LH 0.104,0.063 2.01,0.354 1.906,0.292 12 false for GTMC Made:


for Halogen Headlight


E449528E07
1.052,0.5 2.885,0.698 1.833,0.198 10 false from Auxiliary Battery 0.688,1.177 2.521,1.375 1.833,0.198 10 false H-LP LH 2.094,1.594 2.74,1.844 0.646,0.25 10 false H-LP LH 2.073,3.063 2.719,3.313 0.646,0.25 10 false H-LP RH 0.708,2.635 1.354,2.885 0.646,0.25 10 false H-LP RH 4.281,2.854 4.927,3.104 0.646,0.25 10 false 8E 4.021,0.885 4.667,1.135 0.646,0.25 10 false 6 2.635,0.885 2.833,1.094 0.198,0.208 10 false 1 1.99,0.906 2.188,1.115 0.198,0.208 10 false 2 1.969,1.208 2.167,1.417 0.198,0.208 10 false 5 2.646,1.177 2.844,1.385 0.198,0.208 10 false 3 5.719,0.813 6.365,1.063 0.646,0.25 10 false 8 5.667,1 6.021,1.229 0.354,0.229 10 false MB 6.083,0.906 6.729,1.156 0.646,0.25 10 false HRLY 2.615,3.677 3.26,3.927 0.646,0.25 10 false LO 1.885,4.094 2.531,4.344 0.646,0.25 10 false E 1.844,4.458 2.427,4.708 0.583,0.25 10 false A142 2.625,5.521 3.271,5.771 0.646,0.25 10 false LO 1.885,5.885 2.531,6.135 0.646,0.25 10 false E 1.813,6.271 2.271,6.479 0.458,0.208 10 false A137 1.823,4.635 3.771,4.958 1.948,0.323 10 false Headlight Assembly RH 1.958,2.677 2.156,2.885 0.198,0.208 10 false 5 1.948,2.344 2.146,2.552 0.198,0.208 10 false 2 2.656,2.615 2.854,2.823 0.198,0.208 10 false 3 2.646,2.354 2.844,2.563 0.198,0.208 10 false 1 6.042,2.365 6.688,2.615 0.646,0.25 10 false HRY2 5.427,4.531 7.073,5.021 1.646,0.49 10 false Main Body ECU (Multiplex Network Body ECU) 4.281,3.021 5.76,3.469 1.479,0.448 10 false Power Distribution Box Assembly 2.938,3.583 3.135,3.802 0.198,0.219 10 false 2 1.667,4 1.844,4.198 0.177,0.198 10 false 1 2.938,5.385 3.135,5.594 0.198,0.208 10 false 2 1.677,5.76 1.813,5.958 0.135,0.198 10 false 1 1.031,1.938 2.865,2.135 1.833,0.198 10 false from Auxiliary Battery 3.969,2.344 4.615,2.594 0.646,0.25 10 false 10 5.708,2.25 5.927,2.438 0.219,0.188 10 false 9 5.667,2.458 6.021,2.688 0.354,0.229 10 false MB 1.813,6.458 3.76,6.781 1.948,0.323 10 false Headlight Assembly LH


CAUTION / NOTICE / HINT

NOTICE:
·

Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.*1

·

Inspect the fuses for circuits related to this system before performing the following procedure.

*1: w/ Smart Entry and Start System




PROCEDURE

1.CHECK VEHICLE TYPE
a.

Check vehicle type.


Result:
Result Proceed to
for LED headlight A
for Halogen headlight B



A

2.PERFORM ACTIVE TEST USING GTS

B

31.PERFORM ACTIVE TEST USING GTS
2.PERFORM ACTIVE TEST USING GTS
a.

Enter the following menus: Body Electrical / Main Body / Active Test.


b.

Perform the Active Test according to the display on the GTS.

Body Electrical > Main Body > Active Test
Tester Display Measurement Item Control Range Diagnostic Note
Headlight Relay / Light Power Supply Relay Headlights OFF or ON -
Body Electrical > Main Body > Active Test
Tester Display
Headlight Relay / Light Power Supply Relay
50004 449 50
OK:

Low beam headlights illuminate.



Result:
Result Proceed to
OK A
NG (LH side low beam light does not illuminate.) (for TFTM Made) B
NG (RH side low beam light does not illuminate.) (for TFTM Made) C
NG (LH side low beam light does not illuminate.) (for GTMC Made) D
NG (RH side low beam light does not illuminate.) (for GTMC Made) E



A

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

Click hereVehicle Exterior>LIGHTING (EXT)>LIGHTING SYSTEM>PROBLEM SYMPTOMS TABLE


B

3.INSPECT HEADLIGHT ASSEMBLY LH (LO TERMINAL VOLTAGE)

C

10.INSPECT HEADLIGHT ASSEMBLY RH (LO TERMINAL VOLTAGE)

D

17.INSPECT HEADLIGHT ASSEMBLY LH (LO TERMINAL VOLTAGE)

E

24.INSPECT HEADLIGHT ASSEMBLY RH (LO TERMINAL VOLTAGE)
3.INSPECT HEADLIGHT ASSEMBLY LH (LO TERMINAL VOLTAGE)
a.

Disconnect the A176 headlight assembly LH connector.


b.

Measure the voltage according to the value(s) in the table below.

Standard Voltage:
Tester Connection Condition Specified Condition
A176-4 (LO) - Body ground Light control switch in head position 11 to 14 V



Result:
Proceed to
OK
NG



OK

4.CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LH - BODY GROUND)

NG

5.INSPECT H-LP LH RELAY
4.CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LH - BODY GROUND)
a.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
A176-2 (E) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

REPLACE HEADLIGHT ASSEMBLY LH

Click hereVehicle Exterior>LIGHTING (EXT)>HEADLIGHT ASSEMBLY (for LED Headlight)>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.INSPECT H-LP LH RELAY

Click hereVehicle Exterior>LIGHTING (EXT)>RELAY>ON-VEHICLE INSPECTION

Result:
Proceed to
OK
NG



OK

6.CHECK HARNESS AND CONNECTOR (H-LP LH RELAY - HEADLIGHT ASSEMBLY LH)

NG

REPLACE H-LP LH RELAY

6.CHECK HARNESS AND CONNECTOR (H-LP LH RELAY - HEADLIGHT ASSEMBLY LH)
a.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
3 (H-LP LH relay) - A176-4 (LO) Always Below 1 Ω
3 (H-LP LH relay) - Body ground Always 10 kΩ or higher
A176-4 (LO) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

7.CHECK HARNESS AND CONNECTOR (H-LP LH RELAY - BATTERY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.CHECK HARNESS AND CONNECTOR (H-LP LH RELAY - BATTERY)
a.
B340809C08
0.115,0.083 0.427,0.281 0.313,0.198 10 false *a
*a Front view of wire harness connector
(to H-LP LH Relay)


Measure the voltage according to the value(s) in the table below.

Standard Voltage:
Tester Connection Switch Condition Specified Condition
2 (H-LP LH relay) - Body ground Ignition switch off 11 to 14 V
5 (H-LP LH relay) - Body ground Ignition switch off 11 to 14 V



Result:
Proceed to
OK
NG



OK

8.CHECK HARNESS AND CONNECTOR (H-LP LH RELAY - POWER DISTRIBUTION BOX ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.CHECK HARNESS AND CONNECTOR (H-LP LH RELAY - POWER DISTRIBUTION BOX ASSEMBLY)
a.

Disconnect the 8E power distribution box assembly connector.


b.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
1 (H-LP LH relay) - 8E-6 Always Below 1 Ω
1 (H-LP LH relay) - Body ground Always 10 kΩ or higher
8E-6 - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

9.CHECK POWER DISTRIBUTION BOX ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.CHECK POWER DISTRIBUTION BOX ASSEMBLY
a.

Remove the power distribution box assembly.

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


b.

Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

E443881C13
1.438,0.073 1.854,0.333 0.417,0.26 5.313,0.302 5.729,0.563 0.417,0.26 4.406,1.24 4.802,0.906 true 0.104,0.083 0.417,0.281 0.313,0.198 10 false *a 1.573,0.125 1.885,0.323 0.313,0.198 10 false 8E 5.406,0.354 5.719,0.552 0.313,0.198 10 false MB 4,1.198 4.615,1.396 0.615,0.198 10 false HRLY
*a Component without harness connected
(Power Distribution Box Assembly) 		- -



c.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
8E-6 - MB-6 (HRLY) Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


10.INSPECT HEADLIGHT ASSEMBLY RH (LO TERMINAL VOLTAGE)
a.

Disconnect the A175 headlight assembly RH connector.


b.

Measure the voltage according to the value(s) in the table below.

Standard Voltage:
Tester Connection Condition Specified Condition
A175-4 (LO) - Body ground Light control switch in head position 11 to 14 V



Result:
Proceed to
OK
NG



OK

11.CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH - BODY GROUND)

NG

12.INSPECT H-LP RH RELAY
11.CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH - BODY GROUND)
a.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
A175-2 (E) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

REPLACE HEADLIGHT ASSEMBLY RH

Click hereVehicle Exterior>LIGHTING (EXT)>HEADLIGHT ASSEMBLY (for LED Headlight)>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

12.INSPECT H-LP RH RELAY

Click hereVehicle Exterior>LIGHTING (EXT)>RELAY>ON-VEHICLE INSPECTION

Result:
Proceed to
OK
NG



OK

13.CHECK HARNESS AND CONNECTOR (H-LP RH RELAY - HEADLIGHT ASSEMBLY RH)

NG

REPLACE H-LP LH RELAY

13.CHECK HARNESS AND CONNECTOR (H-LP RH RELAY - HEADLIGHT ASSEMBLY RH)
a.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
3 (H-LP LH relay) - A175-4 (LO) Always Below 1 Ω
3 (H-LP LH relay) - Body ground Always 10 kΩ or higher
A175-4 (LO) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

14.CHECK HARNESS AND CONNECTOR (H-LP RH RELAY - BATTERY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

14.CHECK HARNESS AND CONNECTOR (H-LP RH RELAY - BATTERY)
a.
B340809C08
0.115,0.083 0.427,0.281 0.313,0.198 10 false *a
*a Front view of wire harness connector
(to H-LP RH Relay)


Measure the voltage according to the value(s) in the table below.

Standard Voltage:
Tester Connection Switch Condition Specified Condition
2 (H-LP LH relay) - Body ground Ignition switch off 11 to 14 V
5 (H-LP LH relay) - Body ground Ignition switch off 11 to 14 V



Result:
Proceed to
OK
NG



OK

15.CHECK HARNESS AND CONNECTOR (H-LP RH RELAY - POWER DISTRIBUTION BOX ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

15.CHECK HARNESS AND CONNECTOR (H-LP RH RELAY - POWER DISTRIBUTION BOX ASSEMBLY)
a.

Disconnect the 8E power distribution box assembly connector.


b.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
1 (H-LP RH relay) - 8E-10 Always Below 1 Ω
1 (H-LP RH relay) - Body ground Always 10 kΩ or higher
8E-10 - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

16.CHECK POWER DISTRIBUTION BOX ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

16.CHECK POWER DISTRIBUTION BOX ASSEMBLY
a.

Remove the power distribution box assembly.

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


b.

Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

E443881C17
1.438,0.073 1.854,0.333 0.417,0.26 5.313,0.302 5.729,0.563 0.417,0.26 4.51,1.24 4.906,0.906 true 0.104,0.083 0.417,0.281 0.313,0.198 10 false *a 1.573,0.125 1.885,0.323 0.313,0.198 10 false 8E 5.406,0.354 5.719,0.552 0.313,0.198 10 false MB 4.125,1.219 4.74,1.417 0.615,0.198 10 false HRY2
*a Component without harness connected
(Power Distribution Box Assembly) 		- -



c.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
8E-10 - MB-9 (HRY2) Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


17.INSPECT HEADLIGHT ASSEMBLY LH (LO TERMINAL VOLTAGE)
a.

Disconnect the A176 headlight assembly LH connector.


b.

Measure the voltage according to the value(s) in the table below.

Standard Voltage:
Tester Connection Condition Specified Condition
A176-4 (LO) - Body ground Light control switch in head position 11 to 14 V



Result:
Proceed to
OK
NG



OK

18.CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LH - BODY GROUND)

NG

19.INSPECT H-LP LH RELAY
18.CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LH - BODY GROUND)
a.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
A176-6 (E) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

REPLACE HEADLIGHT ASSEMBLY LH

Click hereVehicle Exterior>LIGHTING (EXT)>HEADLIGHT ASSEMBLY (for LED Headlight)>DISASSEMBLY


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

19.INSPECT H-LP LH RELAY

Click hereVehicle Exterior>LIGHTING (EXT)>RELAY>ON-VEHICLE INSPECTION

Result:
Proceed to
OK
NG



OK

20.CHECK HARNESS AND CONNECTOR (H-LP LH RELAY - HEADLIGHT ASSEMBLY LH)

NG

REPLACE H-LP LH RELAY

20.CHECK HARNESS AND CONNECTOR (H-LP LH RELAY - HEADLIGHT ASSEMBLY LH)
a.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
3 (H-LP LH relay) - A176-4 (LO) Always Below 1 Ω
3 (H-LP LH relay) - Body ground Always 10 kΩ or higher
A176-4 (LO) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

21.CHECK HARNESS AND CONNECTOR (H-LP LH RELAY - BATTERY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

21.CHECK HARNESS AND CONNECTOR (H-LP LH RELAY - BATTERY)
a.
B340809C08
0.115,0.083 0.427,0.281 0.313,0.198 10 false *a
*a Front view of wire harness connector
(to H-LP LH Relay)


Measure the voltage according to the value(s) in the table below.

Standard Voltage:
Tester Connection Switch Condition Specified Condition
2 (H-LP LH relay) - Body ground Ignition switch off 11 to 14 V
5 (H-LP LH relay) - Body ground Ignition switch off 11 to 14 V



Result:
Proceed to
OK
NG



OK

22.CHECK HARNESS AND CONNECTOR (H-LP LH RELAY - POWER DISTRIBUTION BOX ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

22.CHECK HARNESS AND CONNECTOR (H-LP LH RELAY - POWER DISTRIBUTION BOX ASSEMBLY)
a.

Disconnect the 8E power distribution box assembly connector.


b.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
1 (H-LP LH relay) - 8E-6 Always Below 1 Ω
1 (H-LP LH relay) - Body ground Always 10 kΩ or higher
8E-6 - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

23.CHECK POWER DISTRIBUTION BOX ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

23.CHECK POWER DISTRIBUTION BOX ASSEMBLY
a.

Remove the power distribution box assembly.

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


b.

Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

E443881C13
1.438,0.073 1.854,0.333 0.417,0.26 5.313,0.302 5.729,0.563 0.417,0.26 4.406,1.24 4.802,0.906 true 0.104,0.083 0.417,0.281 0.313,0.198 10 false *a 1.573,0.125 1.885,0.323 0.313,0.198 10 false 8E 5.406,0.354 5.719,0.552 0.313,0.198 10 false MB 4,1.198 4.615,1.396 0.615,0.198 10 false HRLY
*a Component without harness connected
(Power Distribution Box Assembly) 		- -



c.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
8E-6 - MB-6 (HRLY) Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


24.INSPECT HEADLIGHT ASSEMBLY RH (LO TERMINAL VOLTAGE)
a.

Disconnect the A175 headlight assembly RH connector.


b.

Measure the voltage according to the value(s) in the table below.

Standard Voltage:
Tester Connection Condition Specified Condition
A175-4 (LO) - Body ground Light control switch in head position Below 1 V



Result:
Proceed to
OK
NG



OK

25.CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH - BODY GROUND)

NG

26.INSPECT H-LP RH RELAY
25.CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH - BODY GROUND)
a.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
A175-6 (E) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

REPLACE HEADLIGHT ASSEMBLY RH

Click hereVehicle Exterior>LIGHTING (EXT)>HEADLIGHT ASSEMBLY (for LED Headlight)>DISASSEMBLY


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

26.INSPECT H-LP RH RELAY

Click hereVehicle Exterior>LIGHTING (EXT)>RELAY>ON-VEHICLE INSPECTION

Result:
Proceed to
OK
NG



OK

27.CHECK HARNESS AND CONNECTOR (H-LP RH RELAY - HEADLIGHT UNIT ASSEMBLY RH)

NG

REPLACE H-LP RH RELAY

27.CHECK HARNESS AND CONNECTOR (H-LP RH RELAY - HEADLIGHT UNIT ASSEMBLY RH)
a.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
3 (H-LP RH relay) - A175-4 (LO) Always Below 1 Ω
3 (H-LP RH relay) - Body ground Always 10 kΩ or higher
A175-4 (LO) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

28.CHECK HARNESS AND CONNECTOR (H-LP RH RELAY - BATTERY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

28.CHECK HARNESS AND CONNECTOR (H-LP RH RELAY - BATTERY)
a.
B340809C08
0.115,0.083 0.427,0.281 0.313,0.198 10 false *a
*a Front view of wire harness connector
(to H-LP RH Relay)


Measure the voltage according to the value(s) in the table below.

Standard Voltage:
Tester Connection Switch Condition Specified Condition
2 (H-LP RH relay) - Body ground Ignition switch off 11 to 14 V
5 (H-LP RH relay) - Body ground Ignition switch off 11 to 14 V



Result:
Proceed to
OK
NG



OK

29.CHECK HARNESS AND CONNECTOR (H-LP RH RELAY - POWER DISTRIBUTION BOX ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

29.CHECK HARNESS AND CONNECTOR (H-LP RH RELAY - POWER DISTRIBUTION BOX ASSEMBLY)
a.

Disconnect the 8E power distribution box assembly connector.


b.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
1 (H-LP RH relay) - 8E-10 Always Below 1 Ω
1 (H-LP RH relay) - Body ground Always 10 kΩ or higher
8E-10 - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

30.CHECK POWER DISTRIBUTION BOX ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

30.CHECK POWER DISTRIBUTION BOX ASSEMBLY
a.

Remove the power distribution box assembly.

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


b.

Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

E443881C14
1.438,0.073 1.854,0.333 0.417,0.26 5.313,0.302 5.729,0.563 0.417,0.26 4.5,1.271 4.917,0.917 true 0.104,0.083 0.417,0.281 0.313,0.198 10 false *a 1.573,0.125 1.885,0.323 0.313,0.198 10 false 8E 5.427,0.354 5.74,0.552 0.313,0.198 10 false MB 4.094,1.188 4.708,1.385 0.615,0.198 10 false HRY2
*a Component without harness connected
(Power Distribution Box Assembly) 		- -



c.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
8E-10 - MB-9 (HRY2) Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


31.PERFORM ACTIVE TEST USING GTS
a.

Enter the following menus: Body Electrical / Main Body / Active Test.


b.

Perform the Active Test according to the display on the GTS.

Body Electrical > Main Body > Active Test
Tester Display Measurement Item Control Range Diagnostic Note
Headlight Relay / Light Power Supply Relay Headlights OFF or ON -
Body Electrical > Main Body > Active Test
Tester Display
Headlight Relay / Light Power Supply Relay
50004 449 50
OK:

Low beam headlights illuminate.



Result:
Result Proceed to
OK A
NG (LH side low beam light does not illuminate.) B
NG (RH side low beam light does not illuminate.) C



A

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

Click hereVehicle Exterior>LIGHTING (EXT)>LIGHTING SYSTEM>PROBLEM SYMPTOMS TABLE


B

32.INSPECT HEADLIGHT ASSEMBLY LH (LO TERMINAL VOLTAGE)

C

39.INSPECT HEADLIGHT ASSEMBLY RH (LO TERMINAL VOLTAGE)
32.INSPECT HEADLIGHT ASSEMBLY LH (LO TERMINAL VOLTAGE)
a.

Disconnect the A137 headlight assembly LH connector.


b.

Measure the voltage according to the value(s) in the table below.

Standard Voltage:
Tester Connection Condition Specified Condition
A137-2 (LO) - Body ground Light control switch in head position 11 to 14 V



Result:
Proceed to
OK
NG



OK

33.CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LH - BODY GROUND)

NG

34.INSPECT H-LP LH RELAY
33.CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LH - BODY GROUND)
a.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
A137-1 (E) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

REPLACE HEADLIGHT ASSEMBLY LH

Click hereVehicle Exterior>LIGHTING (EXT)>HEADLIGHT ASSEMBLY (for LED Headlight)>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

34.INSPECT H-LP LH RELAY

Click hereVehicle Exterior>LIGHTING (EXT)>RELAY>ON-VEHICLE INSPECTION

Result:
Proceed to
OK
NG



OK

35.CHECK HARNESS AND CONNECTOR (H-LP LH RELAY - HEADLIGHT ASSEMBLY LH)

NG

REPLACE H-LP LH RELAY

35.CHECK HARNESS AND CONNECTOR (H-LP LH RELAY - HEADLIGHT ASSEMBLY LH)
a.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
3 (H-LP LH relay) - A137-2 (LO) Always Below 1 Ω
3 (H-LP LH relay) -Body ground Always 10 kΩ or higher
A137-2 (LO) -Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

36.CHECK HARNESS AND CONNECTOR (H-LP LH RELAY - BATTERY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

36.CHECK HARNESS AND CONNECTOR (H-LP LH RELAY - BATTERY)
a.
B340809C08
0.115,0.083 0.427,0.281 0.313,0.198 10 false *a
*a Front view of wire harness connector
(to H-LP LH Relay)


Measure the voltage according to the value(s) in the table below.

Standard Voltage:
Tester Connection Switch Condition Specified Condition
2 (H-LP LH relay) - Body ground Ignition switch off 11 to 14 V
5 (H-LP LH relay) - Body ground Ignition switch off 11 to 14 V



Result:
Proceed to
OK
NG



OK

37.CHECK HARNESS AND CONNECTOR (H-LP LH RELAY - POWER DISTRIBUTION BOX ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

37.CHECK HARNESS AND CONNECTOR (H-LP LH RELAY - POWER DISTRIBUTION BOX ASSEMBLY)
a.

Disconnect the 8E power distribution box assembly connector.


b.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
1 (H-LP LH relay) - 8E-6 Always Below 1 Ω
1 (H-LP LH relay) - Body ground Always 10 kΩ or higher
8E-6 - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

38.CHECK POWER DISTRIBUTION BOX ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

38.CHECK POWER DISTRIBUTION BOX ASSEMBLY
a.

Remove the power distribution box assembly.

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


b.

Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

E443881C13
1.438,0.073 1.854,0.333 0.417,0.26 5.313,0.302 5.729,0.563 0.417,0.26 4.406,1.24 4.802,0.906 true 0.104,0.083 0.417,0.281 0.313,0.198 10 false *a 1.573,0.125 1.885,0.323 0.313,0.198 10 false 8E 5.406,0.354 5.719,0.552 0.313,0.198 10 false MB 4,1.198 4.615,1.396 0.615,0.198 10 false HRLY
*a Component without harness connected
(Power Distribution Box Assembly) 		- -



c.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
8E-6 - MB-8 (HRLY) Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


39.INSPECT HEADLIGHT ASSEMBLY RH (LO TERMINAL VOLTAGE)
a.

Disconnect the A142 headlight assembly RH connector.


b.

Measure the voltage according to the value(s) in the table below.

Standard Voltage:
Tester Connection Condition Specified Condition
A142-2 (LO) - Body ground Light control switch in head position 11 to 14 V



Result:
Proceed to
OK
NG



OK

40.CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH - BODY GROUND)

NG

41.INSPECT H-LP RH RELAY
40.CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH - BODY GROUND)
a.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
A142-1 (E) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

REPLACE HEADLIGHT ASSEMBLY RH

Click hereVehicle Exterior>LIGHTING (EXT)>HEADLIGHT ASSEMBLY (for LED Headlight)>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

41.INSPECT H-LP RH RELAY

Click hereVehicle Exterior>LIGHTING (EXT)>RELAY>ON-VEHICLE INSPECTION

Result:
Proceed to
OK
NG



OK

42.CHECK HARNESS AND CONNECTOR (H-LP RH RELAY - HEADLIGHT UNIT ASSEMBLY RH)

NG

REPLACE H-LP RH RELAY

42.CHECK HARNESS AND CONNECTOR (H-LP RH RELAY - HEADLIGHT UNIT ASSEMBLY RH)
a.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
3 (H-LP RH relay) - A142-2 (LO) Always Below 1 Ω
3 (H-LP RH relay) - Body ground Always 10 kΩ or higher
A142-2 (LO) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

43.CHECK HARNESS AND CONNECTOR (H-LP RH RELAY - BATTERY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

43.CHECK HARNESS AND CONNECTOR (H-LP RH RELAY - BATTERY)
a.
B340809C08
0.115,0.083 0.427,0.281 0.313,0.198 10 false *a
*a Front view of wire harness connector
(to H-LP RH Relay)


Measure the voltage according to the value(s) in the table below.

Standard Voltage:
Tester Connection Switch Condition Specified Condition
2 (H-LP RH relay) - Body ground Ignition switch off 11 to 14 V
5 (H-LP RH relay) - Body ground Ignition switch off 11 to 14 V



Result:
Proceed to
OK
NG



OK

44.CHECK HARNESS AND CONNECTOR (H-LP RH RELAY - POWER DISTRIBUTION BOX ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

44.CHECK HARNESS AND CONNECTOR (H-LP RH RELAY - POWER DISTRIBUTION BOX ASSEMBLY)
a.

Disconnect the 8E power distribution box assembly connector.


b.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
1 (H-LP RH relay) - 8E-10 Always Below 1 Ω
1 (H-LP RH relay) - Body ground Always 10 kΩ or higher
8E-10 - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

45.CHECK POWER DISTRIBUTION BOX ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

45.CHECK POWER DISTRIBUTION BOX ASSEMBLY
a.

Remove the power distribution box assembly.

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


b.

Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

E443881C14
1.438,0.073 1.854,0.333 0.417,0.26 5.313,0.302 5.729,0.563 0.417,0.26 4.5,1.271 4.917,0.917 true 0.104,0.083 0.417,0.281 0.313,0.198 10 false *a 1.573,0.125 1.885,0.323 0.313,0.198 10 false 8E 5.427,0.354 5.74,0.552 0.313,0.198 10 false MB 4.094,1.188 4.708,1.385 0.615,0.198 10 false HRY2
*a Component without harness connected
(Power Distribution Box Assembly) 		- -



c.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
8E-10 - MB-9 (HRY2) Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL


NG

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU>REMOVAL