B2431

LIGHTING (EXT): LIGHTING SYSTEM: B2430,B2431: LED Headlight LH Circuit Malfunction
B2431 - LED Headlight RH Circuit Malfunction

DESCRIPTION

These DTCs are stored when the low beam headlights do not illuminate, or a malfunction is detected in the communication between the headlight assembly and main body ECU (multiplex network body ECU).





WIRING DIAGRAM





INSPECTION PROCEDURE

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

PROCEDURE

1. CHECK FOR DTC

(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(b) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

Result





C -- INSPECT HEADLIGHT UNIT

B -- CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY - BATTERY AND BODY GROUND)

A -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting

2. CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY - BATTERY AND BODY GROUND)

(a) Disconnect the 1G and 1H No. 2 integration relay connectors.

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

Standard Voltage:





Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY - INSTRUMENT PANEL JUNCTION BLOCK)

(a) Disconnect the 1G No. 2 integration relay connector.

(b) Disconnect the 2C instrument panel junction block assembly connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Remove the instrument panel junction block assembly.





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

Standard Resistance:





Text in Illustration





NG -- REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
OK -- Continue to next step.

5. REPLACE NO. 2 INTEGRATION RELAY

(a) Temporarily replace the No. 2 integration relay with a new or normally functioning one Components.

(b) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC B2430 and B2431 are not output.

NG -- REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Service and Repair

OK -- END

6. INSPECT HEADLIGHT UNIT

(a) Disconnect the A17 or A16 headlight unit connector.





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

Standard Voltage:

LH Side (B2430)





RH Side (B2431)





Text in Illustration





NG -- CHECK HARNESS AND CONNECTOR (HEADLIGHT UNIT - NO. 2 INTEGRATION RELAY)
OK -- Continue to next step.

7. INSPECT MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

(a) Disconnect the A17 or A16 headlight unit connector.





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

Standard Voltage:

LH Side (B2430)





RH Side (B2431)





Text in Illustration





NG -- CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - HEADLIGHT UNIT)
OK -- Continue to next step.

8. CHECK HARNESS AND CONNECTOR (HEADLIGHT UNIT - BODY GROUND)

(a) Disconnect the A17 or A16 headlight unit connector.





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

Standard Resistance:

LH Side (B2430)





RH Side (B2431)





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

9. REPLACE LIGHT CONTROL ECU

(a) Temporarily replace the headlight control ECU with a new or normally functioning one Components.

(b) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC B2430 or B2431 is not output.

NG -- REPLACE HEADLIGHT UNIT Components

OK -- END

10. CHECK HARNESS AND CONNECTOR (HEADLIGHT UNIT - NO. 2 INTEGRATION RELAY)

(a) Disconnect the 1G No. 2 integration relay connector.

(b) Disconnect the A17 or A16 headlight unit connector.

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

Standard Resistance:

LH Side (B2430)





RH Side (B2431)





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE NO. 2 INTEGRATION RELAY Components

11. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - HEADLIGHT UNIT)

(a) Disconnect the F7 main body ECU (multiplex network body ECU) connector.

(b) Disconnect the A17 or A16 headlight unit connector.

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

Standard Resistance:

LH Side (B2430)





RH Side (B2431)





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Service and Repair