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 (GND TERMINAL)

INSPECT PARKING BRAKE SWITCH

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

INSPECT BRAKE FLUID LEVEL WARNING SWITCH

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

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

NOTICE:

When replacing the brake actuator assembly, perform zero point calibration (CAMRY_ACV40 RM000000XHR03AX.html).

1. Check if the CAN communication system DTC is output (CAMRY_ACV40 RM000000WIB05NX.html for LHD, or CAMRY_ACV40 RM000000WIB05SX.html for RHD).
   
   

   Result:

   
   

   Condition	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 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 on (IG).
   

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

   Standard voltage:

   Tester Connection	Condition	Specified Condition
   A26-46 (IG1) - Body ground	Ignition switch on (IG)	10 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
   A26-32 (GND1) - Body ground	Always	Below 1 Ω
   A26-1 (GND2) - Body ground	Always	Below 1 Ω

1. Disconnect the parking brake switch connector.
   

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

   Standard resistance:

   Tester Connection	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:

   A/T:

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

   M/T:

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

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 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
   1 - 2	Float up (Switch OFF)	1.9 to 2.1 kΩ
   1 - 2	Float down (Switch ON)	Below 1 Ω

   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 connector.
   

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

   Standard resistance:

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

1. Perform Active Test of the combination meter (meter CPU) using the intelligent tester (CAMRY_ACV40 RM0000012G700LX.html).
   

   OK:

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

   HINT:

   1. Reinstall the connectors and restore the vehicle to its prior condition before checking the combination meter.
      
   2. 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 (CAMRY_ACV40 RM000000XHN04RX.html).