Anti-Lock Brake System Brake Warning Light Remains On

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PREPARE FOR INSPECTION

CHECK DTC FOR ABS

CHECK CAN COMMUNICATION SYSTEM

INSPECT SKID CONTROL ECU CONNECTOR

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

READ VALUE USING INTELLIGENT TESTER (PARKING BRAKE SWITCH)

INSPECT BRAKE FLUID LEVEL WARNING SWITCH

CHECK WIRE HARNESS (COMBINATION METER - LEVEL WARNING SWITCH AND BODY GROUND)

CHECK COMBINATION METER

INSPECT PARKING BRAKE SWITCH ASSEMBLY

CHECK WIRE HARNESS (JUNCTION BLOCK - PARKING BRAKE SWITCH AND BODY GROUND)

DESCRIPTION

1. The ECU connectors are disconnected from the skid control ECU.
   
2. The brake fluid level is insufficient.
   
3. The parking brake is applied.
   
4. The EBD is defective.
   

WIRING DIAGRAM

INSPECTION PROCEDURE

1. Check that both of the following conditions are satisfied.
   

   1. The brake fluid level in the brake master cylinder reservoir is correct.
      
   2. The parking brake is released.
      

   HINT:

   When the ABS warning light remains illuminated, repair the malfunctions in the ABS system first.

1. Check if any ABS DTCs are output (RAV4_ACA30 RM000000ONJ026X.html).
   

   Result

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

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. Using the Data List, check for proper functioning of the parking brake switch.
   
   

   Skid control ECU

   Tester Display	Measurement Item / Range	Normal Condition	Diagnostic Notes
   Parking Brake SW	Parking brake switch / ON or OFF	ON: Parking brake applied OFF: Parking brake released	-

   OK:

   When the parking brake lever is operated, the display changes as shown above.
   

1. Remove the reservoir tank cap and strainer.
   

2. Disconnect the brake fluid level warning switch connector.
   

3. Measure the resistance of the switch.
   

   HINT:

   A float is placed inside the reservoir. Its position can be changed by increasing or decreasing the brake fluid level.

   Standard resistance:

   Tester Connection	Switch Condition	Specified Condition
   1 (+) - 2 (E)	Float up (Switch OFF)	10 kΩ or higher
   1 (+) - 2 (E)	Float down (Switch ON)	Below 1 Ω

   HINT:

   If there is no problem after the above check is finished, adjust the brake fluid level to the MAX level.

1. Disconnect the E22 combination meter connector.
   

2. Disconnect the A10 switch connector.
   

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

   Standard resistance:

   Tester Connection	Specified Condition
   E22-14 (SW) - A10-1 (+)	Below 1 Ω
   E22-14 (SW) - Body ground	10 kΩ or higher
   A10-2 (E) - Body ground	Below 1 Ω

1. Check the combination meter (RAV4_ACA30 RM0000020M0001X.html).
   

1. Remove the parking brake switch.
   

2. Measure the resistance of the switch.
   

   Standard resistance:

   Tester Connection	Switch Condition	Specified Condition
   1 - Body ground	Parking brake switch ON (Switch pin not pushed)	Below 1 Ω
   1 - Body ground	Parking brake switch OFF (Switch pin pushed)	10 kΩ or higher

1. Disconnect the ID junction block connector.
   

2. Disconnect the E46 switch connector.
   

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

   Standard resistance:

   Tester Connection	Specified Condition
   ID-4 (PKB) - E46-1	Below 1 Ω
   ID-4 (PKB) - Body ground	10 kΩ or higher