ABS Warning Light does not Come ON

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT ABS WARNING LIGHT

CHECK CAN COMMUNICATION LINE

CHECK DTC (CAN COMMUNICATION SYSTEM)

CHECK OPERATION OF ABS WARNING LIGHT (ACTIVE TEST)

Description

If any of the following is detected, the ABS warning light remains on.

  1. The skid control ECU connectors are disconnected from the skid control ECU.
  2. There is a malfunction in the skid control ECU internal circuit.
  3. There is an open in the harness between the combination meter and skid control ECU.

HINT:

There is a case that the intelligent tester cannot be used when the skid control ECU is abnormal.

Wiring diagram

ABS Warning Light does not Come ON. Land Cruiser.

Inspection procedure

NOTICE:

When replacing the master cylinder solenoid, perform zero point calibration .

1.INSPECT ABS WARNING LIGHT

  1. Disconnect the skid control ECU connector.

  1. Turn the ignition switch to ON.

  1. Check that the ABS warning light comes on.

    OK:

    ABS warning light comes on.

    Result
    Result Proceed to
    NG A
    OK LHD B
    RHD C
  B  
REPLACE MASTER CYLINDER SOLENOID
 
  C  
REPLACE MASTER CYLINDER SOLENOID
 
A  
   

2.CHECK CAN COMMUNICATION LINE

  1. Turn the ignition switch off.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and the intelligent tester on.

  1. Select "Bus Check" from the System Selection Menu screen, and follow the prompts on the screen to inspect the CAN Bus.

    OK:

    "Bus Check" indicates no malfunctions in CAN communication.

    Result
    Result Proceed to
    OK A
    NG LHD B
    RHD C
  B  
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)
 
  C  
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)
 
A  
   

3.CHECK DTC (CAN COMMUNICATION SYSTEM)

  1. Turn the ignition switch off.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and the intelligent tester on.

  1. Check for DTCs (LHD: /RHD: ).

    Result
    Result Proceed to
    CAN system DTC is not output A
    CAN system DTC is output LHD B
    RHD C
  B  
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)
 
  C  
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)
 
A  
   

4.CHECK OPERATION OF ABS WARNING LIGHT (ACTIVE TEST)

  1. Turn the ignition switch off.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON and the intelligent tester on.

  1. Enter the following menus: Body Electrical / Combination Meter / Active Test.

  1. Check the condition of the ABS warning light by operating the intelligent tester.

    Combination Meter
    Tester Display Test Part Control Range Diagnostic Note
    Indicat. Lamp ABS ABS Warning Light Warning light ON/OFF -

    OK:

    The warning light turns on when operating the intelligent tester.

    Result
    Result Proceed to
    OK A
    NG w/ Multi-information Display B
    w/o Multi-information Display C
  B  
REPLACE COMBINATION METER ASSEMBLY
 
  C  
REPLACE COMBINATION METER ASSEMBLY
 
A  
   
USE SIMULATION METHOD TO CHECK