Dtc B2430 Led Headlight Lh Circuit Malfunction

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CLEAR DTC

CHECK FOR DTC

INSPECT HEADLIGHT RELAY (H-LP LO OR H-LP LH)

CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY [H-LP LO OR H-LP LH] - BATTERY)

CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY [H-LP LO OR H-LP LH] - COWL SIDE JUNCTION BLOCK LH)

INSPECT COWL SIDE JUNCTION BLOCK LH

CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY [H-LP LO OR H-LP LH] - HEADLIGHT)

CHECK HARNESS AND CONNECTOR (HEADLIGHT - MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] AND BODY GROUND)

CHECK HEADLIGHT ASSEMBLY

DESCRIPTION

HINT:

DTC B2430 and B2431 are not output if 20 seconds have not elapsed since the ignition switch was turned on.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

1. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
   
2. If the main body ECU (multiplex network body ECU) is replaced, refer to Registration (Click here).
   

1. Clear the DTCs (Click here).
   

1. Check for DTCs (Click here).
   

   OK:

   DTC B2430 or B2431 output does not occur.
   

1. Remove the headlight relay from the engine room relay block.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   3 - 5	Battery voltage not applied between terminals 1 and 2	10 kΩ or higher
   3 - 5	Battery voltage applied between terminals 1 and 2	Below 1 Ω

1. Remove the headlight relay from the engine room relay block.
   

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

   Standard Voltage:

   Tester Connection	Condition	Specified Condition
   Headlight relay terminal 1 - Body ground	Always	11 to 14 V
   Headlight relay terminal 3 - Body ground	Always	11 to 14 V

   Text in Illustration

   *a	Front view of wire harness connector (to Headlight Relay)

1. Remove the headlight relay from the engine room relay block.
   

2. Disconnect the 2H cowl side junction block LH connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   Headlight relay terminal 2 - 2H-30	Always	Below 1 Ω
   2H-30 - Body ground	Always	10 kΩ or higher

1. for LHD:
   

   1. Remove the cowl side junction block LH (Click here).
      

   2. Remove the main body ECU (multiplex network body ECU) from the cowl side junction block LH (Click here).
      

2. for RHD:
   

   1. Remove the cowl side junction block LH (Click here).
      

   2. Remove the main body ECU (multiplex network body ECU) from the cowl side junction block LH (Click here).
      

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   A-15 (HRLY) - 2H-30	Always	Below 1 Ω

   Result

   Result	Proceed to
   OK	A
   NG (for LHD)	B
   NG (for RHD)	C

1. Remove the headlight relay from the engine room relay block.
   

2. Disconnect the A65*1 or A68*2 headlight connector.
   

   1. *1: for LH
      
   2. *2: for RH
      

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

   Standard Resistance:

   for LH:

   Tester Connection	Condition	Specified Condition
   Headlight relay terminal 5 - A65-1 (LO)	Always	Below 1 Ω
   Headlight relay terminal 5 - Body ground	Always	10 kΩ or higher

   for RH:

   Tester Connection	Condition	Specified Condition
   Headlight relay terminal 5 - A68-1 (LO)	Always	Below 1 Ω
   Headlight relay terminal 5 - Body ground	Always	10 kΩ or higher

1. Disconnect the A65*1 or A68*2 headlight unit connector.
   

   1. *1: for LH
      
   2. *2: for RH
      

2. Disconnect the E118 main body ECU (multiplex network body ECU) connector.
   

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

   Standard Resistance:

   for LH:

   Tester Connection	Condition	Specified Condition
   A65-7 (S) - E118-16 (LLEW)	Always	Below 1 Ω
   A65-2 (E) - Body ground	Always	Below 1 Ω
   A65-7 (S) - Body ground	Always	10 kΩ or higher

   for RH:

   Tester Connection	Condition	Specified Condition
   A68-7 (S) - E118-3 (RLEW)	Always	Below 1 ΩS
   A68-2 (E) - Body ground	Always	Below 1 Ω
   A68-7 (S) - Body ground	Always	10 kΩ or higher

1. for LED Headlight:
   

   1. Temporarily replace the headlight with a new or normally functioning one (Click here).
      

2. for Halogen Headlight and LED Headlight:
   

   1. Temporarily replace the headlight with a new or normally functioning one (Click here).
      

3. Check for DTCs (Click here).
   

   OK:

   DTC B2430 or B2431 output does not occur.