RM3660EC _59 Vehicle Exterior _080784 LIGHTING (EXT) _0600055 LIGHTING SYSTEM(for NR Series Engine) J

LIGHTING (EXT)  LIGHTING SYSTEM(for NR Series Engine)  LO-beam Headlight does not Illuminate  


DESCRIPTION

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

WIRING DIAGRAM

for TFTM Made


E386589E45
4.219,2.375 4.531,2.573 0.313,0.198 10 false 4B 0.969,0.396 2.042,0.594 1.073,0.198 10 false H-LP LH 0.948,0.802 2.021,1 1.073,0.198 10 false H-LP RH 2.26,0.25 4.406,0.448 2.146,0.198 10 false from Battery 2.833,1.323 3.146,1.521 0.313,0.198 10 false 1A 1.479,1.323 1.792,1.521 0.313,0.198 10 false 1B 1.469,2.375 1.781,2.573 0.313,0.198 10 false 1A 4.229,2.167 4.542,2.365 0.313,0.198 10 false 31 5.844,2.375 6.156,2.573 0.313,0.198 10 false MB 5.833,1.323 6.292,1.521 0.458,0.198 10 false I85 5.844,1.125 6.156,1.323 0.313,0.198 10 false 12 5.854,2.188 6.167,2.385 0.313,0.198 10 false 15 6.188,2.292 6.802,2.49 0.615,0.198 10 false HRLY 6.188,1.24 6.802,1.438 0.615,0.198 10 false HRY2 2,2.01 3.073,2.208 1.073,0.198 10 false H-LP RH 2,3.073 3.073,3.271 1.073,0.198 10 false H-LP LH 1.563,3.417 3.396,3.615 1.833,0.198 10 false No. 1 Integration Relay 1.615,4.927 3.365,5.229 1.75,0.302 10 false Headlight Assembly LH 1.594,6.229 3.583,6.427 1.99,0.198 10 false Headlight Assembly RH 2.51,5.573 2.823,5.771 0.313,0.198 10 false LO 2.51,4.26 2.823,4.458 0.313,0.198 10 false LO 1.823,5.573 1.979,5.771 0.156,0.198 10 false E 1.813,4.26 1.969,4.458 0.156,0.198 10 false E 1.656,5.479 1.813,5.677 0.156,0.198 10 false 1 1.656,4.156 1.813,4.354 0.156,0.198 10 false 1 2.771,5.479 2.927,5.677 0.156,0.198 10 false 2 2.771,4.167 2.927,4.365 0.156,0.198 10 false 2 5.365,5.469 7.021,6.031 1.656,0.563 10 false Main Body ECU (Multiplex Network Body ECU) 4.438,2.906 6.063,3.656 1.625,0.75 10 false Driver Side Junction Block Assembly 1.604,4.781 2.573,5.042 0.969,0.26 10 false A23 2.865,2.615 3.021,2.813 0.156,0.198 10 false 1 2.875,2.188 3.031,2.385 0.156,0.198 10 false 2 2.844,1.552 3.094,1.75 0.25,0.198 10 false 12 2.844,1.135 3.115,1.333 0.271,0.198 10 false 11 1.521,1.125 1.677,1.323 0.156,0.198 10 false 8 1.521,2.177 1.677,2.375 0.156,0.198 10 false 5 2.25,0.677 4.396,0.875 2.146,0.198 10 false from Battery 2.823,1.74 3.135,1.938 0.313,0.198 10 false 1A 2.833,2.375 3.146,2.573 0.313,0.198 10 false 1B 2.823,2.792 3.135,2.99 0.313,0.198 10 false 1B 1.583,6.063 1.906,6.333 0.323,0.271 10 false A22


for GTMC Made


E386589E46
4.219,2.375 4.531,2.573 0.313,0.198 10 false 4B 0.969,0.396 2.042,0.594 1.073,0.198 10 false H-LP LH 0.948,0.802 2.021,1 1.073,0.198 10 false H-LP RH 2.26,0.25 4.406,0.448 2.146,0.198 10 false from Battery 2.833,1.323 3.146,1.521 0.313,0.198 10 false 1A 1.479,1.323 1.792,1.521 0.313,0.198 10 false 1B 1.469,2.365 1.781,2.563 0.313,0.198 10 false 1A 4.229,2.167 4.542,2.365 0.313,0.198 10 false 31 5.844,2.375 6.156,2.573 0.313,0.198 10 false MB 5.833,1.323 6.292,1.521 0.458,0.198 10 false I85 5.844,1.125 6.156,1.323 0.313,0.198 10 false 12 5.854,2.188 6.167,2.385 0.313,0.198 10 false 15 6.188,2.292 6.802,2.49 0.615,0.198 10 false HRLY 6.188,1.24 6.802,1.438 0.615,0.198 10 false HRY2 2,2.01 3.073,2.208 1.073,0.198 10 false H-LP RH 2,3.073 3.073,3.271 1.073,0.198 10 false H-LP LH 1.542,3.417 3.375,3.615 1.833,0.198 10 false No. 1 Integration Relay 1.542,4.906 3.292,5.208 1.75,0.302 10 false Headlight Assembly LH 1.542,6.219 3.531,6.417 1.99,0.198 10 false Headlight Assembly RH 2.479,5.573 2.792,5.771 0.313,0.198 10 false LO 2.479,4.25 2.792,4.448 0.313,0.198 10 false LO 1.823,5.594 1.979,5.792 0.156,0.198 10 false E 1.833,4.26 1.99,4.458 0.156,0.198 10 false E 1.615,5.469 1.771,5.667 0.156,0.198 10 false 5 1.604,4.156 1.76,4.354 0.156,0.198 10 false 5 2.76,5.458 2.917,5.656 0.156,0.198 10 false 4 2.771,4.156 2.927,4.354 0.156,0.198 10 false 4 5.365,5.469 7.021,6.031 1.656,0.563 10 false Main Body ECU (Multiplex Network Body ECU) 4.438,2.906 6.063,3.656 1.625,0.75 10 false Driver Side Junction Block Assembly 1.552,6.063 2.583,6.25 1.031,0.188 10 false A167 1.542,4.75 2.51,5.01 0.969,0.26 10 false A168 2.865,2.615 3.021,2.813 0.156,0.198 10 false 1 2.875,2.188 3.031,2.385 0.156,0.198 10 false 2 2.844,1.552 3.094,1.75 0.25,0.198 10 false 12 2.844,1.135 3.115,1.333 0.271,0.198 10 false 11 1.521,1.125 1.677,1.323 0.156,0.198 10 false 8 1.521,2.177 1.677,2.375 0.156,0.198 10 false 5 2.25,0.677 4.396,0.875 2.146,0.198 10 false from Battery 2.823,1.74 3.135,1.938 0.313,0.198 10 false 1A 2.833,2.375 3.146,2.573 0.313,0.198 10 false 1B 2.823,2.792 3.135,2.99 0.313,0.198 10 false 1B


CAUTION / NOTICE / HINT

NOTICE:
·

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

·

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



PROCEDURE

1.PERFORM ACTIVE TEST USING GTS
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

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


e.

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 Low beam headlights OFF or ON -
Body Electrical > Main Body > Active Test
Tester Display
Headlight Relay
50004 123 14
OK:

Low beam headlights illuminate.



Result:
Result Proceed to
OK A
NG (for LH Side) B
NG (for RH Side) C



A

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

Click hereVehicle Exterior>LIGHTING (EXT)>LIGHTING SYSTEM (for NR Series Engine)>PROBLEM SYMPTOMS TABLE


B

2.CONFIRM MODEL

C

13.CONFIRM MODEL
2.CONFIRM MODEL
a.

Choose the model to be inspected.


Result:
Result Proceed to
for TFTM Made A
for GTMC Made B



A

3.INSPECT HEADLIGHT ASSEMBLY LH (LO TERMINAL VOLTAGE)

B

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

Disconnect the A23 headlight assembly LH connector.


b.
E367359C49
1.448,0.625 1.927,0.896 0.479,0.271 2.052,2.833 1.719,1.844 false 0.25,0.344 0.708,0.542 0.458,0.198 10 false *a 1.969,2.865 2.427,3.063 0.458,0.198 10 false LO 1.552,0.677 2.167,0.875 0.615,0.198 10 false A23
*a Front view of wire harness connector
(to Headlight Assembly LH)


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

Standard Voltage:
Tester Connection Condition Specified Condition
A23-2 (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.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - HEADLIGHT ASSEMBLY LH)
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
A23-1 (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 TFTM Made)>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - HEADLIGHT ASSEMBLY LH)
a.

Disconnect the 1B No. 1 integration relay connector.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
1B-1 - A23-2 (LO) Always Below 1 Ω
1B-1 or A23-2 (LO) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

9.INSPECT NO. 1 INTEGRATION RELAY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.INSPECT HEADLIGHT ASSEMBLY LH (LO TERMINAL VOLTAGE)
a.
A417826C53
1.51,0.167 1.917,0.406 0.406,0.24 2.583,0.688 1.958,0.99 true 0.125,0.125 0.438,0.281 0.313,0.156 10 false *a 1.531,0.208 1.948,0.417 0.417,0.208 10 false A168 2.698,0.563 3.313,0.76 0.615,0.198 10 false LO
*a Front view of wire harness connector
(to Headlight Assembly LH)


Disconnect the A168 headlight assembly LH connector.


b.

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

Standard Voltage:
Tester Connection Condition Specified Condition
A168-4 (LO) - Body ground Light control switch in head position 11 to 14 V



Result:
Proceed to
OK
NG



OK

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

NG

8.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - HEADLIGHT ASSEMBLY LH)
7.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
A168-5 (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 GTMC Made)>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - HEADLIGHT ASSEMBLY LH)
a.

Disconnect the 1B No. 1 integration relay connector.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
1B-1 - A168-4 (LO) Always Below 1 Ω
1B-1 or A168-4 (LO) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

9.INSPECT NO. 1 INTEGRATION RELAY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.CHECK HARNESS AND CONNECTOR (POWER SOURCE - NO. 1 INTEGRATION RELAY)
a.

Disconnect the 1A No. 1 integration relay connector.


b.

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

Standard Voltage:
Tester Connection Condition Specified Condition
1A-5 - Body ground Always 11 to 14 V



Result:
Proceed to
OK
NG



OK

11.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

11.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - DRIVER SIDE JUNCTION BLOCK ASSEMBLY)
a.

Disconnect the 4B driver side junction block assembly connector.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
1B-2 - 4B-31 Always Below 1 Ω
1B-2 or 4B-31 - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

12.INSPECT DRIVER SIDE JUNCTION BLOCK ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

12.INSPECT DRIVER SIDE JUNCTION BLOCK ASSEMBLY
E344206C23
1.292,0.177 1.604,0.396 0.313,0.219 4.635,0.531 4.948,0.75 0.313,0.219 4.448,1.542 4.615,1.104 false 4.229,1.594 4.646,1.76 0.417,0.167 10 false HRLY 4.698,0.573 5.01,0.771 0.313,0.198 10 false MB 1.365,0.208 1.677,0.406 0.313,0.198 10 false 4B 0.135,0.115 0.406,0.313 0.271,0.198 10 false *a
*a Component without harness connected
(Driver Side Junction Block Assembly) 		- -


a.

Remove the main body ECU (multiplex network body ECU) from the driver side junction block assembly.

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


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
4B-31 - MB-15 (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 DRIVER SIDE JUNCTION BLOCK ASSEMBLY

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


13.CONFIRM MODEL
a.

Choose the model to be inspected.


Result:
Result Proceed to
for TFTM Made A
for GTMC Made B



A

14.INSPECT HEADLIGHT ASSEMBLY RH (LO TERMINAL VOLTAGE)

B

17.INSPECT HEADLIGHT ASSEMBLY RH (LO TERMINAL VOLTAGE)
14.INSPECT HEADLIGHT ASSEMBLY RH (LO TERMINAL VOLTAGE)
a.
E367359C51
1.469,0.677 1.896,0.917 0.427,0.24 2.052,2.833 1.719,1.844 false 1.563,0.719 2.021,0.917 0.458,0.198 10 false A22 0.25,0.344 0.708,0.542 0.458,0.198 10 false *a 1.969,2.865 2.427,3.063 0.458,0.198 10 false LO
*a Front view of wire harness connector
(to Headlight Assembly RH)


Disconnect the A22 headlight assembly RH connector.


b.

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

Standard Voltage:
Tester Connection Condition Specified Condition
A22-2 (LO) - Body ground Light control switch in head position 11 to 14 V



Result:
Proceed to
OK
NG



OK

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

NG

16.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - HEADLIGHT ASSEMBLY RH)
15.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
A22-1 (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 TFTM Made)>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

16.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - HEADLIGHT ASSEMBLY RH)
a.

Disconnect the 1A No. 1 integration relay connector.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
1A-12 - A22-2 (LO) Always Below 1 Ω
1A-12 or A22-2 (LO) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

20.INSPECT NO. 1 INTEGRATION RELAY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

17.INSPECT HEADLIGHT ASSEMBLY RH (LO TERMINAL VOLTAGE)
a.
A417826C55
1.51,0.167 1.917,0.406 0.406,0.24 2.583,0.688 1.958,0.99 true 0.125,0.125 0.438,0.281 0.313,0.156 10 false *a 1.563,0.208 1.979,0.417 0.417,0.208 10 false A167 2.698,0.563 3.313,0.76 0.615,0.198 10 false LO
*a Front view of wire harness connector
(to Headlight Assembly RH)


Disconnect the A167 headlight assembly RH connector.


b.

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

Standard Voltage:
Tester Connection Condition Specified Condition
A167-4 (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 RH - BODY GROUND)

NG

19.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - HEADLIGHT ASSEMBLY RH)
18.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
A167-5 (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 GTMC Made)>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

19.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - HEADLIGHT ASSEMBLY RH)
a.

Disconnect the 1A No. 1 integration relay connector.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
1A-12 - A167-4 (LO) Always Below 1 Ω
1A-12 or A167-4 (LO) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

20.INSPECT NO. 1 INTEGRATION RELAY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

21.CHECK HARNESS AND CONNECTOR (POWER SOURCE - NO. 1 INTEGRATION RELAY)
a.

Disconnect the 1B No. 1 integration relay connector.


b.

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

Standard Voltage:
Tester Connection Condition Specified Condition
1B-8 - Body ground Always 11 to 14 V



Result:
Proceed to
OK
NG



OK

22.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

22.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))
a.

Disconnect the I85 main body ECU (multiplex network body ECU) connector.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
1A-11 - I85-12 (HRY2) Always Below 1 Ω
1A-11 or I85-12 (HRY2) - Body ground Always 10 kΩ or higher



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

REPAIR OR REPLACE HARNESS OR CONNECTOR