Brake Warning Light Remains ON
BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: Brake Warning Light Remains ON
Brake Warning Light Remains ON
DESCRIPTION
The BRAKE warning light lights up when the brake fluid is insufficient, the parking brake is applied or the EBD is defective.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTE: When replacing the master cylinder solenoid, perform zero point calibration (Programming and Relearning).
PROCEDURE
1. CHECK DTC
(a) Check the DTCs (Vehicle Stability Control System).
B -- REPAIR CIRCUITS INDICATED BY OUTPUT DTCS
A -- Continue to next step.
2. CHECK BRAKE FLUID LEVEL
(a) Check the amount of brake fluid in the brake reservoir.
OK:
Brake fluid level is correct.
NG -- ADD BRAKE FLUID
OK -- Continue to next step.
3. CHECK SKID CONTROL ECU CONNECTOR
(a) Check whether skid control ECU connector is connected securely.
OK:
The skid control ECU connector is connected securely.
NG -- CONNECT CONNECTOR CORRECTLY
OK -- Continue to next step.
4. INSPECT BATTERY
(a) Check the battery voltage.
Standard:
11 to 14 V
NG -- INSPECT CHARGING SYSTEM
OK -- Continue to next step.
5. INSPECT SKID CONTROL ECU (IG1 TERMINAL VOLTAGE)
(a) Disconnect the skid control ECU connector.
(b) Turn the ignition switch to the ON position.
(c) Measure the voltage.
Standard:
(d) Turn the ignition switch to OFF.
(e) Reconnect the skid control ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)
OK -- Continue to next step.
6. CHECK HARNESS AND CONNECTOR (GND TERMINAL CONTINUITY)
(a) Disconnect the skid control ECU connectors.
(b) Measure the resistance.
Standard:
(c) Reconnect the skid control ECU connectors.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT)
OK -- Continue to next step.
7. INSPECT BRAKE FLUID LEVEL WARNING SWITCH
(a) Disconnect the brake fluid level warning switch connector.
(b) Measure the resistance.
Standard:
(c) Reconnect the brake fluid level warning switch connector.
HINT: If there is no problem after finishing the above check, adjust the brake fluid level to the maximum level.
NG -- REPLACE BRAKE MASTER CYLINDER RESERVOIR SUB-ASSEMBLY
OK -- Continue to next step.
8. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BRAKE FLUID LEVEL WARNING SWITCH)
(a) Disconnect the skid control ECU connector.
(b) Disconnect the brake fluid level warning switch connector.
(c) Measure the resistance.
Standard:
(d) Measure the resistance.
Standard:
(e) Reconnect the brake fluid level warning switch connector.
(f) Reconnect the skid control ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
9. INSPECT PARKING BRAKE SWITCH ASSEMBLY
(a) Disconnect the parking brake switch connector.
(b) Measure the resistance.
Standard:
(c) Reconnect the parking brake switch connector.
NG -- REPLACE PARKING BRAKE SWITCH ASSEMBLY
OK -- Continue to next step.
10. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - PARKING BRAKE SWITCH)
(a) Disconnect the skid control ECU.
(b) Disconnect the parking brake switch connector.
(c) Measure the resistance.
Standard:
(d) Reconnect the parking brake switch connector.
(e) Reconnect the skid control ECU.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
11. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - COMBINATION METER)
(a) Disconnect the skid control ECU connector.
(b) Disconnect the combination meter connector.
(c) Measure the resistance.
Standard:
(d) Measure the resistance.
Standard:
(e) Reconnect the combination meter connector.
(f) Reconnect the skid control ECU connector.
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
12. INSPECT COMBINATION METER ASSEMBLY
(a) Check the combination meter system (Problem Symptoms Table).
OK:
Combination meter is normal.
NG -- REPLACE COMBINATION METER ASSEMBLY
OK -- REPLACE MASTER CYLINDER SOLENOID