DTC B2430: LED Headlight LH Circuit Malfunction; DTC B2431: LED Headlight RH Circuit Malfunction [08/2015 - ]: Procedure

1. Clear the DTCs. Refer to DTC CHECK / CLEAR [08/2015 - ] .
2. Check for DTCs. Refer to DTC CHECK / CLEAR [08/2015 - ] .
   RESULT
   
   

   Result	Proceed to
   Both DTC B2430 and B2431 are not output.	A
   Both DTC B2430 and B2431 are output.	B
   DTC B2430 or B2431 is output.	C

B → Refer to   2 

C → Refer to   6 

A → Refer to   16 

1. Disconnect the 1H No. 1 integration relay connector.
2. Measure the voltage and resistance according to the value(s) in the table below.

   Standard Voltage

   Tester Connector	Condition	Specified Condition
   1H-7 (BATT) - Body ground	Power switch off	11 to 14 V

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1H-3 (GND2) - Body ground	Always	Below 1 Ω

3. Disconnect the 1G No. 1 integration relay connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1G-22 (GND1) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the 2C instrument panel junction block assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1G-9 (HL4) - 2C-32	Always	Below 1 Ω
   1G-9 (HL4) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the instrument panel junction block assembly. Refer to REMOVAL [08/2015 - ] .

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   2C-32 - MB-15 (HRLY)	Always	Below 1 Ω
   2C-32 - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Instrument Panel Junction Block Assembly)

NG → Refer to   15 

OK: Go to next step 

1. Temporarily replace the No. 1 integration relay with a new or normally functioning one. Refer to REMOVAL [08/2015 - ] .
2. Check for DTC. Refer to DTC CHECK / CLEAR [08/2015 - ] .

   OK

   DTC B2430 and B2431 are not output.

NG → Refer to   12 

OK → END (NO. 1 INTEGRATION RELAY WAS DEFECTIVE) 

1. Disconnect the A79 or A81 headlight assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Voltage

   LH SIDE (B2430)
   
   

   Tester Connection	Switch Condition	Specified Condition
   A79-3 (B) - Body ground	Light control switch in head position	11 to 14 V

   RH SIDE (B2431)
   
   

   Tester Connection	Switch Condition	Specified Condition
   A81-3 (B) - Body ground	Light control switch in head position	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Headlight Assembly LH)
   *b	Front view of wire harness connector (to Headlight Assembly RH)

NG → Refer to   10 

OK: Go to next step 

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   LH SIDE (B2430)
   
   

   Tester Connection	Switch Condition	Specified Condition
   A79-1 (PPOS) - Body ground	Power switch on (IG) and light control switch in head position	11 to 14 V

   RH SIDE (B2431)
   
   

   Tester Connection	Switch Condition	Specified Condition
   A81-1 (PPOS) - Body ground	Power switch on (IG) and light control switch in head position	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Headlight Assembly LH)
   *b	Front view of wire harness connector (to Headlight Assembly RH)

NG → Refer to   11 

OK: Go to next step 

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

   Standard Resistance

   LH SIDE (B2430)
   
   

   Tester Connection	Condition	Specified Condition
   A79-5 (E) - Body ground	Always	Below 1 Ω

   RH SIDE (B2431)
   
   

   Tester Connection	Condition	Specified Condition
   A81-5 (E) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Temporarily replace the headlight assembly with a new or normally functioning one. Refer to REMOVAL [08/2015 - ] .
2. Check for DTC. Refer to DTC CHECK / CLEAR [08/2015 - ] .

   OK

   DTC B2430 or B2431 is not output.

NG → Refer to   14 

OK → END (HEADLIGHT ASSEMBLY WAS DEFECTIVE) 

1. Disconnect the 1G No. 1 integration relay connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   LH SIDE (B2430)
   
   

   Tester Connection	Condition	Specified Condition
   1G-2 (HLPL) - A79-3 (B)	Always	Below 1 Ω
   1G-2 (HLPL) - Body ground	Always	10 kΩ or higher

   RH SIDE (B2431)
   
   

   Tester Connection	Condition	Specified Condition
   1G-1 (HLPR) - A81-3 (B)	Always	Below 1 Ω
   1G-1 (HLPR) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → Refer to   13 

1. Disconnect the L8 main body ECU (multiplex network body ECU) connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   LH SIDE (B2430)
   
   

   Tester Connection	Condition	Specified Condition
   L8-21 (LLEW) - A79-1 (PPOS)	Always	Below 1 Ω
   L8-21 (LLEW) - Body ground	Always	10 kΩ or higher

   RH SIDE (B2431)
   
   

   Tester Connection	Condition	Specified Condition
   L8-5 (RLEW) - A81-1 (PPOS)	Always	Below 1 Ω
   L8-5 (RLEW) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → Refer to   12