DTC B2430: LED Headlight LH Circuit Malfunction; DTC B2431: LED Headlight RH Circuit Malfunction [09/2014 - 03/2019]: Procedure

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [09/2014 - 03/2019]

   Body Electrical > Main Body > Clear DTCs 

2. Check for DTCs.

   Refer to DTC CHECK / CLEAR [09/2014 - 03/2019]

   Body Electrical > Main Body > Trouble Codes 

   Result

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

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - 08/2016]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2016 - 11/2017]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2017 - 03/2019] 

Result: 

C 

See step  6

Result: 

B 

See step  2

1. Remove the semiconductor pwr integration ECU from the No. 2 engine room relay block and No. 2 junction block assembly.

   Refer to REMOVAL [09/2014 - ]

2. Inspect the semiconductor pwr integration ECU.

   Refer to INSPECTION [09/2014 - ]

   Result

   Semiconductor pwr integration ECU is normal.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE SEMICONDUCTOR POWER INTEGRATION ECU. Refer to  REMOVAL [09/2014 - ] 

Result: 

OK 

See step  3

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   2B-1 (BATT) - Body ground	Always	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Disconnect the 4C 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
   2D-8 (HLLS) - 4C-29	Always	Below 1 Ω
   2D-8 (HLLS) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Remove the instrument panel junction block assembly.

   Refer to REMOVAL [09/2014 - ]

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a

   Component without harness connected (Instrument Panel Junction Block Assembly)

   -

   -

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   4C-29 - MB-15 (HRLY)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [09/2014 - ] 

Result: 

NG 

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [09/2014 - ] 

1. Disconnect the A31*1 or A2*2 headlight assembly connector.
   1. *1: for LH Side
   2. *2: for RH Side
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   FOR LH SIDE (B2430)
   
   

   Tester Connection	Condition	Specified Condition
   A31-5 (LO) - Body ground	Engine switch off, light control switch in head position	11 to 14 V

   FOR RH SIDE (B2431)
   
   

   Tester Connection	Condition	Specified Condition
   A2-5 (LO) - Body ground	Engine switch off, light control switch in head position	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  11

Result: 

OK 

See step  7

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

   Standard Resistance

   FOR LH SIDE (B2430)
   
   

   Tester Connection	Condition	Specified Condition
   A31-6 (E) - Body ground	Always	Below 1 Ω

   FOR RH SIDE (B2431)
   
   

   Tester Connection	Condition	Specified Condition
   A2-6 (E) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  8

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

   Standard Voltage

   FOR LH SIDE (B2430)
   
   

   Tester Connection	Condition	Specified Condition
   A31-7 (S) - Body ground	Engine switch on (IG), light control switch in head position	11 to 14 V

   FOR RH SIDE (B2431)
   
   

   Tester Connection	Condition	Specified Condition
   A2-7 (S) - Body ground	Engine switch on (IG), light control switch in head position	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  10

Result: 

OK 

See step  9

1. Temporarily replace the headlight assembly with a new or known good one.

   Refer to REMOVAL [09/2014 - 03/2019]

2. Check for DTCs.

   Refer to DTC CHECK / CLEAR [09/2014 - 03/2019]

   Body Electrical > Main Body > Trouble Codes 

   Result

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

Result: 

A 

END (HEADLIGHT ASSEMBLY WAS DEFECTIVE) 

Result: 

B 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [09/2014 - ] 

1. Disconnect the O2 main body ECU (multiplex network body ECU) connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   FOR LH SIDE (B2430)
   
   

   Tester Connection	Condition	Specified Condition
   A31-7 (S) - O2-16 (LLEW)	Always	Below 1 Ω
   A31-7 (S) - Body ground	Always	10 kΩ or higher

   FOR RH SIDE (B2431)
   
   

   Tester Connection	Condition	Specified Condition
   A2-7 (S) - O2-3 (RLEW)	Always	Below 1 Ω
   A2-7 (S) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [09/2014 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Remove the semiconductor pwr integration ECU from the No. 2 engine room relay block and No. 2 junction block assembly.

   Refer to REMOVAL [09/2014 - ]

2. Inspect the semiconductor pwr integration ECU.

   Refer to INSPECTION [09/2014 - ]

   Result

   Semiconductor pwr integration ECU is normal.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPAIR OR REPLACE HARNESS OR CONNECTOR (HEADLIGHT ASSEMBLY - SEMICONDUCTOR PWR INTEGRATION ECU) 

Result: 

NG 

REPLACE SEMICONDUCTOR POWER INTEGRATION ECU. Refer to  REMOVAL [09/2014 - ]