Vehicle Stability Control 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 HARNESS AND CONNECTOR (SKID CONTROL ECU - BATTERY AND BODY GROUND)

READ VALUE USING INTELLIGENT TESTER (PARKING BRAKE SWITCH)

INSPECT BRAKE FLUID LEVEL WARNING SWITCH

CHECK HARNESS AND CONNECTOR (BRAKE FLUID LEVEL WARNING SW - COMBINATION METER/BODY GROUND)

INSPECT COMBINATION METER ASSEMBLY

INSPECT PARKING BRAKE SWITCH ASSEMBLY

CHECK HARNESS AND CONNECTOR (PARKING BRAKE SWITCH - JUNCTION BLOCK/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

NOTICE:

When replacing the brake actuator assembly, perform zero point calibration (RAV4_ACA30 RM000001K1O00SX.html).

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 RM000000ONJ02VX.html).
   

   Result:

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

1. Check if a CAN communication system DTC is output (RAV4_ACA30 RM000001W16007X.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 skid control ECU connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   A67-1 (GND1) - Body ground	Always	Below 1 Ω
   A67-13 (GND2) - Body ground	Always	Below 1 Ω

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

   Standard Voltage:

   Tester Connection	Switch Condition	Specified Condition
   A67-34 (IG1) - Body ground	Ignition switch ON	11 to 14 V

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

   ABS/VSC/TRC:

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   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 according to the value(s) in the table below.
   

   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	Condition	Specified Condition
   1 (+) - 2 (E)	Float up (Switch off)	10 kΩ or higher
   1 (+) - 2 (E)	Float down (Switch on)	Below 1 Ω

   Result:

   Result		Proceed to
   OK		A
   NG	for LHD	B
   	for RHD	C

   HINT:

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

1. Disconnect the combination meter connector.
   

2. Disconnect the brake fluid level warning switch connector.
   

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

   Standard Resistance:

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

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

1. Remove the parking brake switch (RAV4_ACA30 RM000001C4T019X.html).
   

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

   Standard Resistance:

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

1. Disconnect the junction block connector.
   

2. Disconnect the parking brake switch connector.
   

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

   Standard Resistance:

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