Dtc B2430 Led Headlight Lh Circuit Malfunction

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CLEAR DTC

CHECK FOR DTC

INSPECT HEADLIGHT RELAY (H-LP LO)

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

CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY [H-LP LO] - DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

INSPECT DRIVER SIDE JUNCTION BLOCK ASSEMBLY

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

CHECK HARNESS AND CONNECTOR (HEADLIGHT - MAIN BODY ECU AND BODY GROUND)

CHECK HEADLIGHT UNIT

DESCRIPTION

HINT:

DTC B2430 and B2431 are not output if 12 seconds have not elapsed since the ignition switch was turned ON.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

1. Clear the DTCs (LandCruiser RM000000PKT0AFX.html).
   

1. Check for DTCs (LandCruiser RM000000PKT0AFX.html).
   

   OK:

   DTC B2430 or B2431 output does not occur.
   

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

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 assembly.
   

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

   Standard Voltage:

   Tester Connection	Condition	Specified Condition
   Headlight relay terminal 5 - Body ground	Always	11 to 14 V
   Headlight relay terminal 1 - Body ground

   Text in Illustration

   *a	Front view of wire harness connector (to Headlight Relay [H-LP LO])

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

2. Disconnect the 2F driver side junction block assembly 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 - 2F-40	Always	Below 1 Ω
   2F-40 - Body ground	Always	10 kΩ or higher

1. Remove the driver side junction block assembly (LandCruiser RM000003WBO05FX.html).
   

2. Remove the main body ECU from the driver side junction block assembly (LandCruiser RM000003WBO05FX.html).
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   A-15 (HRLY) - 2F-40	Always	Below 1 Ω

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

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

2. Disconnect the A86*1 and A87*2 headlight connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   Headlight relay terminal 3 - A86-1 (B)*1	Always	Below 1 Ω
   Headlight relay terminal 3 - A87-1 (B)*2	Always	Below 1 Ω
   Headlight relay terminal 3 - Body ground	Always	10 kΩ or higher

1. Disconnect the A86*1 or A87*2 headlight unit connector.
   

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

2. Disconnect the G64 main 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
   A86-3 (S) - G64-21 (LLEW)	Always	Below 1 Ω
   A86-2 (LO) - Body ground		Below 1 Ω
   A86-3 (S) - Body ground		10 kΩ or higher

   for RH:

   Tester Connection	Condition	Specified Condition
   A87-3 (S) - G46-8 (RLEW)	Always	Below 1 Ω
   A87-2 (LO) - Body ground		Below 1 Ω
   A87-3 (S) - Body ground		10 kΩ or higher

1. Temporarily replace the headlight with a new or normally functioning one (LandCruiser RM000003QVM00XX.html).
   

2. Check for DTCs (LandCruiser RM000000PKT0AFX.html).
   

   OK:

   DTC B2430 or B2431 output does not occur.