DTC B2430: LED Headlight LH; DTC B2431: LED Headlight RH [08/2019 - ]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Main Body / Trouble Codes.
5. Clear the DTCs.

   Body Electrical > Main Body > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

1. Connect the Techstream to the DLC3.
2. Start the engine.
3. Operate the light control switch to turn on the low beam headlights and wait 12 seconds or more.
4. Turn the Techstream on.
5. Enter the following menus: Body Electrical / Main Body / Trouble Codes.
6. Check for DTCs.

   Body Electrical > Main Body > Trouble Codes 

   OK

   DTC B2430 and B2431 are not output.

   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 [08/2019 - ] 

Result: 

C 

See step  7

Result: 

B 

See step  3

1. Remove the semiconductor power integration ECU from the engine room relay block and junction block assembly.
2. Inspect the semiconductor power integration ECU.

   Refer to INSPECTION [09/2015 - ]

   OK

   Semiconductor power integration ECU is normal.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE SEMICONDUCTOR POWER INTEGRATION ECU. Refer to  REMOVAL [08/2019 - ] 

Result: 

OK 

See step  4

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   B-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  5

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1D-8 - 2C-31	Always	Below 1 Ω
   1D-8 or 2C-31 - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  6

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Refer to REMOVAL [08/2019 - ]

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   2C-31 - 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 [08/2019 - ] 

Result: 

NG 

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [08/2019 - ] 

1. Remove the semiconductor power integration ECU from the engine room relay block and junction block assembly.

   Refer to REMOVAL [08/2019 - ]

2. Inspect the semiconductor power integration ECU.

   Refer to INSPECTION [09/2015 - ]

   OK

   Semiconductor power integration ECU is normal.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE SEMICONDUCTOR POWER INTEGRATION ECU. Refer to  REMOVAL [08/2019 - ] 

Result: 

OK 

See step  8

1. Disconnect the A20 headlight assembly LH connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *A	for LH Side
   *B	for RH Side
   *a	Front view of wire harness connector (to Headlight Assembly)

2. Disconnect the A24 headlight assembly RH connector.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   FOR LH SIDE
   
   

   Tester Connection	Condition	Specified Condition
   A20-5 (LO) - Body ground	Light control switch in head position	11 to 14 V

   FOR RH SIDE
   
   

   Tester Connection	Condition	Specified Condition
   A24-5 (LO) - Body ground	Light control switch in head position	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  9

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

   Standard Resistance

   FOR LH SIDE
   
   

   Tester Connection	Condition	Specified Condition
   A20-6 (E) - Body ground	Always	Below 1 Ω

   FOR RH SIDE
   
   

   Tester Connection	Condition	Specified Condition
   A24-6 (E) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  10

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

   Standard Voltage

   FOR LH SIDE
   
   

   Tester Connection	Condition	Specified Condition
   A20-7 (S) - Body ground	Light control switch in head position	11 to 14 V

   FOR RH SIDE
   
   

   Tester Connection	Condition	Specified Condition
   A24-7 (S) - Body ground	Light control switch in head position	11 to 14 V

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *A	for LH Side
   *B	for RH Side
   *a	Front view of wire harness connector (to Headlight Assembly)

   Result

   Result	Proceed to
   OK (for TMC Made)	A
   OK (for TMMC Made)	B
   NG	C

Result: 

A 

REPLACE HEADLIGHT UNIT. Refer to  DISASSEMBLY [08/2019 - ] 

Result: 

B 

REPLACE HEADLIGHT ASSEMBLY. Refer to  REMOVAL [08/2019 - ] 

Result: 

C 

See step  11

1. Disconnect the J8 main body ECU (multiplex network body ECU) connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   FOR LH SIDE
   
   

   Tester Connection	Condition	Specified Condition
   A20-7 (S) - J8-16 (LLEW)	Always	Below 1 Ω
   A20-7 (S) or J8-16 (LLEW) - Body ground	Always	10 kΩ or higher

   FOR RH SIDE
   
   

   Tester Connection	Condition	Specified Condition
   A24-7 (S) - J8-3 (RLEW)	Always	Below 1 Ω
   A24-7 (S) or J8-3 (RLEW) - 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 [08/2019 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR