Vehicle Stability Control System Brake Warning Light Remains On

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK CAN COMMUNICATION SYSTEM

CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED

CHECK BATTERY

INSPECT SKID CONTROL ECU (IG1 TERMINAL)

INSPECT SKID CONTROL ECU (GND1 TERMINAL)

READ VALUE USING TECHSTREAM (PARKING BRAKE SWITCH)

INSPECT BRAKE FLUID LEVEL WARNING SWITCH

CHECK HARNESS AND CONNECTOR (COMBINATION METER - BRAKE FLUID LEVEL WARNING SWITCH)

INSPECT COMBINATION METER ASSEMBLY

INSPECT PARKING BRAKE SWITCH

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - PARKING BRAKE SWITCH)

DESCRIPTION

1. The skid control ECU connector is disconnected from the skid control ECU.
   
2. The brake fluid level is insufficient.
   
3. The parking brake is applied.
   
4. EBD operation has been disabled.
   

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:

When replacing the brake actuator assembly, perform zero point calibration (COROLLA_ZRE142 RM000000XHR08KX.html).

1. Check if a CAN communication system DTC is output (COROLLA_ZRE142 RM000000WIB0BUX.html).
   
   

   Result:

   
   

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

1. Check if the skid control ECU connector is securely connected.
   

   OK:

   The connector is securely connected.
   

1. Check the battery voltage.
   

   Standard Voltage:

   11 to 14 V
   

   
   

   Result:

   
   

   Result	Proceed to
   OK	A
   NG (for 2AZ-FE)	B
   NG (for 2ZR-FE)	C

1. Disconnect the skid control ECU connector.
   

2. Turn the ignition switch to ON.
   

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

   Standard Voltage:

   Tester Connection	Switch Condition	Specified Condition
   A66-34 (IG1) - Body ground	Ignition switch ON	11 to 14 V

1. Turn the ignition switch off.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   A66-1 (GND1) - Body ground	Always	Below 1 Ω

1. Reconnect the skid control ECU connector.
   

2. Connect the Techstream to the DLC3.
   

3. Turn the ignition switch to ON.
   

4. Select Data List mode on the Techstream (COROLLA_ZRE142 RM000000XHW0BYX.html).
   
   

   ABS/VSC/TRAC

   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	-

5. Using the Techstream, check the switch operation when the parking brake is applied.
   

   OK:

   The Techstream displays ON or OFF according to parking brake operation.
   

1. Turn the ignition switch off.
   

2. Remove the reservoir filler cap and strainer.
   

3. Disconnect the brake fluid level warning switch connector.
   

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

   HINT:

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

   Standard Resistance:

   Tester Connection	Switch Condition	Specified Condition
   1 (+) - 2 (E)	Switch OFF (Float up)	1.9 to 2.1 kΩ
   1 (+) - 2 (E)	Switch ON (Float down)	Below 1 Ω

   HINT:

   If there are no problems after finishing the check above, adjust the brake fluid level to the MAX level.

1. Disconnect the combination meter connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   E46-40 (SW) - A12-1 (+)	Always	Below 1 Ω
   E46-40 (SW) - Body ground	Always	10 kΩ or higher
   A12-2 (E) - Body ground	Always	Below 1 Ω

1. Perform the Active Test of the combination meter (meter CPU) using the Techstream (COROLLA_ZRE142 RM0000012G70D8X.html).
   

2. Check the combination meter.
   

   HINT:

   Reinstall the connectors and restore the vehicle to its prior condition before checking the combination meter.

   OK:

   The brake warning light turns on or off in accordance with the Techstream operation.
   

   HINT:

   If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part (COROLLA_ZRE142 RM000000XHN0DUX.html).

1. Turn the ignition switch off.
   

2. Disconnect the parking brake switch connector.
   

3. 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 free)	Below 1 Ω
   1 - Body ground	Parking brake switch OFF (Switch pin pushed in)	10 kΩ or higher

1. Disconnect the main body ECU connector.
   

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   2C-5 (PKB) - E12-1	Always	Below 1 Ω
   2C-5 (PKB) - Body ground	Always	10 kΩ or higher

   HINT:

   If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part (COROLLA_ZRE142 RM000000XHN0DUX.html).