Anti-Lock Brake System Abs Warning Light Remains On

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK CAN COMMUNICATION SYSTEM

INSPECT SKID CONTROL ECU CONNECTOR

CHECK WIRE HARNESS (SKID CONTROL ECU - BATTERY AND BODY GROUND)

PERFORM ACTIVE TEST USING INTELLIGENT TESTER (ABS WARNING LIGHT)

DESCRIPTION

1. The 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 or short in the wire harness between the combination meter and the skid control ECU.
   

HINT:

The intelligent tester may not be used when there is a malfunction in the skid control ECU.

WIRING DIAGRAM

INSPECTION PROCEDURE

1. Check if the CAN communication system DTC is output (RAV4_ACA30 RM000001RSW00ZX.html).
   

   Result

   Result	Proceed to
   DTC is not output	A
   DTC is output	B

1. Check if the skid control ECU connector is properly installed.
   

   OK:

   The skid control ECU connector is properly installed.
   

1. Disconnect the A27 ECU connector.
   

2. Measure the resistance of the wire harness side connector.
   

   Standard resistance:

   Tester Connection	Specified Condition
   A27-2 (GND1) - Body ground	Below 1 Ω
   A27-24 (GND2) - Body ground	Below 1 Ω

3. Measure the voltage of the wire harness side connector.
   

   Standard voltage:

   Tester Connection	Condition	Specified Condition
   A27-25 (IG) - Body ground	Ignition switch ON	11 to 14 V

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

   Skid control ECU

   Tester Display	Test Part	Control Range	Diagnostic Notes
   ABS Warning Light	Turns ABS warning light	ON or OFF	Observe combination meter

   OK:

   The ABS warning light is turned on or off.
   

HINT:

When the ABS warning light remains illuminated, opens in the wire harness of the combination meter or abnormalities in the meter circuit should be considered.