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).
NOTICE:
DTC B2430 and B2431 are not stored until 12 seconds have elapsed after turning the power switch on (READY).
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:
NOTICE:
DTC B2430 and B2431 are not stored until 12 seconds have elapsed after turning the power switch on (READY).
B -- CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - AUXILIARY BATTERY AND BODY GROUND)
C -- INSPECT HEADLIGHT UNIT
A -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting
2. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - AUXILIARY BATTERY AND BODY GROUND)
(a) Disconnect the 1G and 1H No. 1 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. 1 INTEGRATION RELAY - INSTRUMENT PANEL JUNCTION BLOCK)
(a) Disconnect the 1G No. 1 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.
Text in Illustration
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
OK -- Continue to next step.
5. REPLACE NO. 1 INTEGRATION RELAY
(a) Replace the No. 1 integration relay with a new or a known good one Removal.
(b) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.
NOTICE:
DTC B2430 and B2431 are not stored until 12 seconds have elapsed after turning the power switch on (READY).
OK:
DTC B2430 and B2431 are not output.
NG -- REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Removal
OK -- END (NO. 1 INTEGRATION RELAY WAS DEFECTIVE)
6. INSPECT HEADLIGHT UNIT
(a) Disconnect the A47 or A48 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. 1 INTEGRATION RELAY)
OK -- Continue to next step.
7. INSPECT MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
(a) Disconnect the A47 or A48 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 A47 or A48 headlight unit connector.
(b) 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 -- Continue to next step.
9. REPLACE LIGHT CONTROL ECU
(a) Replace the headlight control ECU with a new or a known good one Disassembly.
(b) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.
NOTICE:
DTC B2430 and B2431 are not stored until 12 seconds have elapsed after turning the power switch on (READY).
OK:
DTC B2430 or B2431 is not output.
NG -- REPLACE HEADLIGHT UNIT Removal
OK -- END (LIGHT CONTROL ECU WAS DEFECTIVE)
10. CHECK HARNESS AND CONNECTOR (HEADLIGHT UNIT - NO. 1 INTEGRATION RELAY)
(a) Disconnect the 1G No. 1 integration relay connector.
(b) Disconnect the A47 or A48 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. 1 INTEGRATION RELAY Removal
11. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - HEADLIGHT UNIT)
(a) Disconnect the H17 main body ECU (multiplex network body ECU) connector.
(b) Disconnect the A47 or A48 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) Removal