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

LIGHTING (EXT)  LIGHTING SYSTEM(w/ Headlight ECU)  B242E  Open in IG Circuit  


DESCRIPTION

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

The IG terminal power source voltage is supplied by turning the IG1 NO. 1 relay to ON.

The headlight ECU sub-assembly receives engine switch on (IG) signals from the main body ECU (multiplex network body ECU) via CAN communication, compares the engine switch on (IG) signal and the power source voltage supply condition of the IG terminal and monitors the result.

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from Note
B242E Open in IG Circuit
Detection condition:

The engine switch is on (IG)


Malfunction status:

When the IG terminal power source voltage is 0 V (engine switch off), IG ON signals from the main body ECU (multiplex network body ECU) via CAN communication are continuously received


Malfunction duration:

10 seconds or more


·

Headlight ECU sub-assembly LH

·

Headlight ECU sub-assembly RH

·

Harness or connector


HL AutoLeveling
HL AutoLeveling (Sub) 		-

WIRING DIAGRAM

E370857E12
0.292,0.708 2.281,0.906 1.99,0.198 10 false from IG1 NO.1 Relay 2.458,0.875 3.521,1.156 1.063,0.281 10 false ECU-IG1 NO.3 4.708,1.875 5.146,2.115 0.438,0.24 10 false A54 4.719,4.115 5.125,4.354 0.406,0.24 10 false A55 4.708,2.031 7.021,2.313 2.313,0.281 10 false Headlight ECU Sub-assembly LH 4.708,4.25 7.125,4.5 2.417,0.25 10 false Headlight ECU Sub-assembly RH 5.021,0.625 5.229,0.875 0.208,0.25 10 false 4 5.01,2.844 5.219,3.094 0.208,0.25 10 false 4 5.188,0.729 5.427,0.948 0.24,0.219 10 false IG 5.188,2.948 5.427,3.167 0.24,0.219 10 false IG 4.948,1.25 5.156,1.5 0.208,0.25 10 false 12 4.938,3.469 5.146,3.719 0.208,0.25 10 false 12 5.177,1.354 5.552,1.615 0.375,0.26 10 false GND 5.177,3.563 5.552,3.823 0.375,0.26 10 false GND

CAUTION / NOTICE / HINT

NOTICE:
·

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

·

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 B242E is not output.



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



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 (HEADLIGHT ECU SUB-ASSEMBLY LH - BATTERY AND BODY GROUND)

C

4.CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY RH - BATTERY AND BODY GROUND)
3.CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY LH - BATTERY AND BODY GROUND)
E411296C02
1.5,0.531 1.896,0.833 0.396,0.302 1.688,2.5 1.823,1.865 false 0.625,2.521 0.76,1.885 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 1.604,2.531 1.917,2.729 0.313,0.198 10 false IG 0.563,2.563 0.875,2.76 0.313,0.198 10 false GND
*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
A54-4 (IG) - Body ground Engine switch on (IG) 11 to 14 V



c.

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

4.CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY RH - BATTERY AND BODY GROUND)
E411296C03
1.5,0.531 1.896,0.833 0.396,0.302 1.688,2.5 1.823,1.865 false 0.604,2.51 0.781,1.906 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 1.604,2.531 1.917,2.729 0.313,0.198 10 false IG 0.469,2.531 0.781,2.729 0.313,0.198 10 false GND
*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
A55-4 (IG) - Body ground Engine switch on (IG) 11 to 14 V



c.

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