ANTI-LOCK BRAKE SYSTEM > ABS Warning Light does not Come ON

for Preparation Click here


DESCRIPTION

If the skid control ECU detects a malfunction, it will prohibit ABS control, illuminate the ABS warning light and store a DTC. Connecting terminals TC and CG of the DLC3 causes the ECU to display DTCs through ABS warning light blinking patterns.

WIRING DIAGRAM


C108877E01


INSPECTION PROCEDURE

1.CHOOSE DIAGNOSIS METHOD

  1. Choose the diagnosis method
    Method 
    Method
    		Proceed to
    Using intelligent tester
    		A
    Not using intelligent tester
    		B



B
Go to step 3
A


2.PERFORM ACTIVE TEST BY INTELLIGENT TESTER (ABS WARNING LIGHT)

  1. Select the Active Test, generate a control command, and then check that the ABS warning light operates.


Skid control ECU 
Item
Vehicle Condition / Test Details
Diagnostic Note
ABS Warning Light
Turn ABS warning light ON / OFF
Observe combination meter

OK:
ABS warning light turns on or off.



OK
REPLACE BRAKE ACTUATOR ASSEMBLY
NG


3.CHECK ABS WARNING LIGHT
C108884E08

  1. Disconnect the S2 ECU connector.

  1. Turn the ignition switch ON.

  1. Using a service wire, connect terminal WA to GND1 or GND2 of the S2 ECU connector. Check the ABS warning light.

    OK:
    ABS warning light turns off.

  1. Turn the ignition switch OFF.

  1. Remove the service wire.

  1. Turn the ignition switch ON. Check the ABS warning light.

    OK:
    ABS warning light illuminates.



OK
REPLACE BRAKE ACTUATOR ASSEMBLY
NG


4.CHECK WIRE HARNESS (SKID CONTROL ECU - COMBINATION METER ASSEMBLY)
C108898E03

  1. Disconnect the S2 ECU connector.

  1. Disconnect the C8 meter connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    S2-13 (WA) - C8-38
    		Below 1 Ω
    S2-13 (WA) - Body ground
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


5.CHECK INDICATOR AND WARNING LIGHT

  1. Check if the indicators and warning lights (SRS, etc.) other than the ABS warning light operate normally.


Result 
Result
Proceed to
Indicator and warning lights operate normally
A
Indicator and warning lights do not operate normally
B


B
CHECK COMBINATION METER ASSEMBLY (COMBINATION METER CIRCUIT)
A

REPLACE COMBINATION METER ASSEMBLY