Anti-Lock Brake System Brake Warning Light Remains On

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK DTC

INSPECT CAN COMMUNICATION SYSTEM

CHECK IF SKID CONTROL ECU CONNECTOR SECURELY CONNECTED

CHECK BATTERY

INSPECT SKID CONTROL ECU CONNECTOR (IG1 TERMINAL VOLTAGE)

INSPECT SKID CONTROL ECU CONNECTOR (GND TERMINAL CONTINUITY)

INSPECT PARKING BRAKE SWITCH

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

INSPECT BRAKE FLUID LEVEL WARNING SWITCH ASSEMBLY

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

INSPECT COMBINATION METER ASSEMBLY

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 is not possible.
   

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT:

Check the condition of each related circuit connector before troubleshooting (CAMRY_ACV40 RM000000UZ301ZX.html).

1. Check if an ABS DTC is output (CAMRY_ACV40 RM000001JB800PX.html).
   
   

   Result:

   
   

   Condition	Proceed to
   CAN communication system DTC is not output	A
   CAN communication system DTC is output	B

1. Check if a CAN communication system DTC is output (CAMRY_ACV40 RM000001JB800PX.html).
   
   

   Result:

   
   

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

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

   OK:

   The connector should be securely connected.
   

1. Check the battery voltage.
   

   Standard voltage:

   11 to 14 V
   

1. Disconnect the skid control ECU connector.
   

2. Turn the ignition switch to the ON position.
   

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

   Standard voltage:

   Tester Connection	Condition	Specified Condition
   A25-18 (IG1) - Body ground	Ignition switch on	10 to 14 V

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

   Standard resistance:

   Tester Connection	Specified Condition
   A25-4 (GND1) - Body ground	Below 1 Ω
   A25-1 (GND2) - Body ground	Below 1 Ω

1. Remove the parking brake switch.
   

2. Disconnect the parking brake switch connector.
   

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

   Standard resistance:

   Automatic Transaxle

   Tester Connection	Condition	Specified Condition
   (A18-1) - Ground part	Free	Below 1 Ω
   (A18-1) - Ground part	Pushed in	10 kΩ or higher

   Manual Transaxle

   Tester Connection	Condition	Specified Condition
   (E33-1) - Ground part	Free	Below 1 Ω
   (E33-1) - Ground part	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:

   Automatic Transaxle:

   Tester Connection	Specified Condition
   IC-14 - A18-1 (PKB)	Below 1 Ω
   A18-1 (PKB) - Body ground	10 kΩ or higher

   Manual Transaxle:

   Tester Connection	Specified Condition
   IM-2 (PKB) - E33-1 (PKB)	Below 1 Ω
   E33-1 (PKB) - Body ground	10 kΩ or higher

3. Connect the connector.
   

1. Remove the reservoir tank cap.
   

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 located inside the reservoir.

   Its position can be changed by increasing or decreasing the level of brake fluid.

   Standard resistance:

   Tester Connection	Condition	Specified Condition
   (A16-1) - (A16-2)	Float UP	10 kΩ or higher (No Continuity)
   (A16-1) - (A16-2)	Float DOWN	Below 1 Ω (Continuity)

   HINT:

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

1. Disconnect the combination meter assembly connector.
   

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

   Standard resistance:

   Tester Connection	Specified Condition
   A16-1 - F2-6 (B/LE)	Below 1 Ω
   F2-6 (B/LE) - Body ground	10 kΩ or higher
   A16-2 - Body ground	Below 1 Ω

3. Connect the connector.
   

1. Connect the intelligent tester to the DLC3.
   

2. Select the "Active Test" on the tester (CAMRY_ACV40 RM000001JBA003X.html).
   
   

   Active Test: ABS

   Tester Display	Test Part/Control Range	Diagnostic Note
   Brake Warning Light	Turn brake warning light ON / OFF	Observe combination meter

3. Check the ABS warning light operation.
   

   OK:

   The BRAKE warning light turns on or off in accordance with the intelligent tester.
   

   
   

   Result:

   
   

   Condition	Proceed to
   OK	A
   OK (When troubleshooting in accordance with the PROBLEM SYMPTOMS TABLE)	B
   NG	C