RM35X0E _59 Vehicle Exterior _079256 LIGHTING (EXT) _0396321 LIGHTING SYSTEM(w/ Headlight ECU) C

LIGHTING (EXT)  LIGHTING SYSTEM(w/ Headlight ECU)  B242F  Open in B Power Line  


DESCRIPTION

The headlight ECU sub-assembly operates using the power source voltage input from the IG terminal and ECUB terminal.

The power source voltage of the ECUB terminal is supplied when the main body ECU (multiplex network body ECU) turns the ECUB power supply relay (H-LP LH relay and H-LP RH relay) to ON.

The headlight ECU sub-assembly compares the power source voltage supply condition of the IG terminal and ECUB terminal and monitors the result.

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from Note
B242F Open in B Power Line
Detection condition:

The engine switch is on (IG)


Malfunction status:

No power source voltage supplied to ECUB terminal while power source voltage being supplied to IG terminal


Malfunction duration:

10 seconds or more


·

Headlight ECU sub-assembly LH

·

Headlight ECU sub-assembly RH

·

Harness or connector

·

H-LP LH relay

·

H-LP RH relay

·

Instrument panel junction block assembly

·

Main body ECU (multiplex network body ECU)


HL AutoLeveling
HL AutoLeveling (Sub) 		-

WIRING DIAGRAM

E418425E01
0.792,0.281 2.458,0.521 1.667,0.24 10 false from Battery 1.25,3.427 2.875,3.729 1.625,0.302 10 false No. 1 Integration Relay 1.344,1.094 1.948,1.281 0.604,0.188 10 false H-LP LH 1.302,2.427 1.917,2.615 0.615,0.188 10 false H-LP RH 2.073,1.677 2.698,1.896 0.625,0.219 10 false H-LP LH 2.115,2.979 2.729,3.177 0.615,0.198 10 false H-LP RH 4.458,1.365 6.083,1.917 1.625,0.552 10 false Instrument Panel Junction Block Assembly 5.427,3.354 7.104,3.938 1.677,0.583 10 false Main Body ECU (Multiplex Network Body ECU) 5.802,2.24 6.188,2.469 0.385,0.229 10 false N19 5.865,0.938 6.25,1.167 0.385,0.229 10 false A 5.833,0.729 6.219,0.958 0.385,0.229 10 false 15 5.844,2.042 6.229,2.271 0.385,0.229 10 false 12 0.531,0.729 0.719,0.927 0.188,0.198 10 false 1 2.875,0.938 3.26,1.167 0.385,0.229 10 false 1C 6.167,0.823 6.635,1.063 0.469,0.24 10 false HRLY 6.177,2.115 6.646,2.365 0.469,0.25 10 false HRY2 2.365,4.635 2.823,4.854 0.458,0.219 10 false ECUB 2.354,6.104 2.813,6.323 0.458,0.219 10 false ECUB 2.823,4.521 3.281,4.74 0.458,0.219 10 false 13 2.833,5.969 3.292,6.188 0.458,0.219 10 false 13 1.75,5.073 2.135,5.302 0.385,0.229 10 false A54 1.802,6.531 2.188,6.76 0.385,0.229 10 false A55 1.76,5.229 3.031,5.771 1.271,0.542 10 false Headlight ECU Sub-assembly LH 1.813,6.698 3.073,7.073 1.26,0.375 10 false Headlight ECU Sub-assembly RH 1.719,4.521 2.177,4.74 0.458,0.219 10 false 12 1.958,4.646 2.417,4.865 0.458,0.219 10 false GND 1.969,6.115 2.427,6.333 0.458,0.219 10 false GND 1.729,5.979 2.188,6.198 0.458,0.219 10 false 12 2.865,1.385 3.25,1.615 0.385,0.229 10 false 1C 2.885,2.25 3.271,2.479 0.385,0.229 10 false 1D 2.865,2.708 3.25,2.938 0.385,0.229 10 false 1D 0.479,0.938 0.865,1.167 0.385,0.229 10 false 1H 0.854,0.938 1.24,1.167 0.385,0.229 10 false 1I 0.906,0.74 1.094,0.938 0.188,0.198 10 false 1 0.49,1.156 0.708,1.354 0.219,0.198 10 false *1 0.854,1.156 1.073,1.354 0.219,0.198 10 false *2 2.906,1.188 3.094,1.385 0.188,0.198 10 false 2 2.927,0.719 3.115,0.917 0.188,0.198 10 false 1 2.927,2.042 3.115,2.24 0.188,0.198 10 false 4 2.917,2.5 3.104,2.698 0.188,0.198 10 false 3 4.396,7.021 6.021,7.323 1.625,0.302 10 false *1: for 1GD-FTV 4.406,7.344 6.031,7.646 1.625,0.302 10 false *2: for 7GR-FKS 4.448,0.948 4.833,1.177 0.385,0.229 10 false 3C 4.458,0.729 4.844,0.958 0.385,0.229 10 false 31

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.

·

If the headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the headlight ECU sub-assembly LH.

Click hereVehicle Exterior>LIGHTING (EXT)>LIGHTING SYSTEM (w/ Headlight ECU)>INITIALIZATION

·

When replacing the headlight ECU sub-assembly LH, always replace it with a new one. If a headlight ECU sub-assembly LH which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.



PROCEDURE

1.CLEAR DTC
a.

Connect the GTS to the DLC3.


b.

Turn the engine switch on (IG).


c.

Turn the GTS on.


d.

Enter the following menus: Body Electrical / HL AutoLeveling or HL AutoLeveling (Sub) / Clear DTCs.


e.

Clear the DTCs.

Body Electrical > HL AutoLeveling > Clear DTCs
50002 361
Body Electrical > HL AutoLeveling (Sub) > Clear DTCs
50002 414

Result:
Proceed to
NEXT



NEXT

2.CHECK FOR DTC
2.CHECK FOR DTC
a.

Connect the GTS to the DLC3.


b.

Turn the engine switch on (IG).


c.

Wait 10 seconds or more.


d.

Turn the GTS on.


e.

Enter the following menus: Body Electrical / HL AutoLeveling or HL AutoLeveling (Sub) / Trouble Codes.


f.

Check for DTCs.

Body Electrical > HL AutoLeveling > Trouble Codes
50001 361
Body Electrical > HL AutoLeveling (Sub) > Trouble Codes
50001 414
OK:

DTC B242F is not output.



Result:
Result Proceed to
OK A
NG (DTC output from headlight ECU sub-assembly LH and RH) B
NG (DTC output only from headlight ECU sub-assembly LH) C
NG (DTC output only from headlight ECU sub-assembly RH) D



A

USE SIMULATION METHOD TO CHECK

Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>HOW TO PROCEED WITH TROUBLESHOOTING


B

3.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - BATTERY)

C

4.CHECK HEADLIGHT ECU SUB-ASSEMBLY LH (ECUB TERMINAL VOLTAGE)

D

10.CHECK HEADLIGHT ECU SUB-ASSEMBLY RH (ECUB TERMINAL VOLTAGE)
3.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - BATTERY)
a.

Disconnect the No. 1 integration relay connector.


b.
E417378C01
1.563,0.323 1.906,0.552 0.344,0.229 1.573,0.688 1.917,0.917 0.344,0.229 0.146,0.125 0.458,0.281 0.313,0.156 10 false *a 1.656,0.375 1.969,0.531 0.313,0.156 10 false 1H 1.698,0.708 2.01,0.865 0.313,0.156 10 false 1I 1.958,0.365 2.271,0.521 0.313,0.156 10 false *A 1.979,0.719 2.292,0.875 0.313,0.156 10 false *B
*A for 1GD-FTV
*B for 7GR-FKS
*a Front view of wire harness connector
(to No. 1 Integration Relay)


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

Standard Voltage:
for 1GD-FTV
Tester Connection Condition Specified Condition
1H-1 - Body ground Always 11 to 14 V

for 7GR-FKS
Tester Connection Condition Specified Condition
1I-1 - Body ground Always 11 to 14 V



Result:
Proceed to
OK
NG



OK

REPLACE NO. 1 INTEGRATION RELAY

Click herePower Source / Network>POWER DISTRIBUTION>INTEGRATION RELAY>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.CHECK HEADLIGHT ECU SUB-ASSEMBLY LH (ECUB TERMINAL VOLTAGE)
E410532C05
1.5,0.531 1.896,0.833 0.396,0.302 1.385,2.5 1.208,1.938 false 0.24,0.24 0.552,0.438 0.313,0.198 10 false *a 1.573,0.604 1.885,0.802 0.313,0.198 10 false A54 1.281,2.531 1.823,2.813 0.542,0.281 10 false ECUB
*a Front view of wire harness connector
(to Headlight ECU Sub-assembly LH)


a.

Disconnect the headlight ECU sub-assembly LH connector.


b.

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

Standard Voltage:
Tester Connection Switch Condition Specified Condition
A54-13 (ECUB) - Body ground Engine switch on (IG) 11 to 14 V



Result:
Proceed to
OK
NG



OK

5.CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY LH - BODY GROUND)

NG

6.INSPECT NO. 1 INTEGRATION RELAY (H-LP LH RELAY)
5.CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY LH - BODY GROUND)
a.

Disconnect the headlight ECU sub-assembly LH connector.


b.
E410532C06
1.5,0.531 1.896,0.833 0.396,0.302 1.073,2.49 0.896,1.927 false 0.24,0.24 0.552,0.438 0.313,0.198 10 false *a 1.573,0.604 1.885,0.802 0.313,0.198 10 false A54 1.031,2.51 1.573,2.792 0.542,0.281 10 false GND
*a Front view of wire harness connector
(to Headlight ECU Sub-assembly LH)


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

Standard Resistance:
Tester Connection Condition Specified Condition
A54-12 (GND) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH

Click hereVehicle Exterior>LIGHTING (EXT)>HEADLIGHT ECU>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

Disconnect the A54 headlight ECU sub-assembly LH connector.


b.

Disconnect the 1C No. 1 integration relay connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
1C-2 - A54-13 (ECUB) Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

8.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)
a.

Disconnect the 1C No. 1 integration relay connector.


b.

Disconnect the 3C instrument panel junction block assembly connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
1C-1 - 3C-31 Always Below 1 Ω
1C-1 or 3C-31 - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

9.INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
E416825C08
1.74,0.583 2.115,0.833 0.375,0.25 4.875,0.938 5.25,1.188 0.375,0.25 4.563,2.083 4.938,1.573 true 0.479,0.438 0.792,0.635 0.313,0.198 10 false *a 1.844,0.635 2.156,0.833 0.313,0.198 10 false 3C 5.01,0.99 5.323,1.188 0.313,0.198 10 false A 4.427,2.125 4.958,2.354 0.531,0.229 10 false HRLY
*a Component without harness connected
(Instrument Panel Junction Block Assembly) 		- -


a.

Remove the instrument panel junction block assembly.

for LHD:

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU (for LHD)>REMOVAL

for RHD:

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU (for RHD)>REMOVAL


b.

Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
3C-31 - A-15 (HRLY) Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

for LHD:

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU (for LHD)>REMOVAL

for RHD:

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU (for RHD)>REMOVAL


NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

for LHD:

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU (for LHD)>REMOVAL

for RHD:

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU (for RHD)>REMOVAL


10.CHECK HEADLIGHT ECU SUB-ASSEMBLY RH (ECUB TERMINAL VOLTAGE)
E410532C07
1.5,0.531 1.896,0.833 0.396,0.302 1.385,2.5 1.208,1.938 false 0.24,0.24 0.552,0.438 0.313,0.198 10 false *a 1.573,0.604 1.885,0.802 0.313,0.198 10 false A55 1.281,2.531 1.823,2.813 0.542,0.281 10 false ECUB
*a Front view of wire harness connector
(to Headlight ECU Sub-assembly RH)


a.

Disconnect the headlight ECU sub-assembly RH connector.


b.

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

Standard Voltage:
Tester Connection Switch Condition Specified Condition
A55-13 (ECUB) - Body ground Engine switch on (IG) 11 to 14 V



Result:
Proceed to
OK
NG



OK

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

NG

12.INSPECT NO. 1 INTEGRATION RELAY (H-LP-RH RELAY)
11.CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY RH - BODY GROUND)
a.

Disconnect the headlight ECU sub-assembly RH connector.


b.
E410532C08
1.5,0.531 1.896,0.833 0.396,0.302 1.063,2.479 0.885,1.917 false 0.24,0.24 0.552,0.438 0.313,0.198 10 false *a 1.573,0.604 1.885,0.802 0.313,0.198 10 false A55 1.021,2.521 1.563,2.802 0.542,0.281 10 false GND
*a Front view of wire harness connector
(to Headlight ECU Sub-assembly RH)


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

Standard Resistance:
Tester Connection Condition Specified Condition
A55-12 (GND) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH

Click hereVehicle Exterior>LIGHTING (EXT)>HEADLIGHT ECU>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

12.INSPECT NO. 1 INTEGRATION RELAY (H-LP-RH RELAY)
a.

Remove the No. 1 integration relay.

Click herePower Source / Network>POWER DISTRIBUTION>INTEGRATION RELAY>REMOVAL


b.

Inspect the H-LP RH relay.

Click herePower Source / Network>POWER DISTRIBUTION>INTEGRATION RELAY>INSPECTION


Result:
Proceed to
OK
NG



OK

13.CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY RH - NO. 1 INTEGRATION RELAY)

NG

REPLACE NO. 1 INTEGRATION RELAY

Click herePower Source / Network>POWER DISTRIBUTION>INTEGRATION RELAY>REMOVAL


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

Disconnect the A55 headlight ECU sub-assembly RH connector.


b.

Disconnect the 1D No. 1 integration relay connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
1D-3 - A55-13 (ECUB) Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

Remove the 1D No. 1 integration connector.


b.

Disconnect the N19 main body ECU (multiplex network body ECU) connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
1D-4 - N19-12 (HRY2) Always Below 1 Ω
1D-4 or N19-12 (HRY2) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

for LHD:

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU (for LHD)>REMOVAL

for RHD:

Click herePower Source / Network>POWER DISTRIBUTION>MAIN BODY ECU (for RHD)>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR