Brake Warning Light Circuit

ANTI-LOCK BRAKE SYSTEM:

Brake Warning Light Circuit

DESCRIPTION

The BRAKE warning light comes on when the brake fluid is insufficient, the parking brake is applied or the EBD is defective.

WIRING DIAGRAM

INSPECTION PROCEDURE

HINT: When releasing the parking brake, set the chocks to hold the vehicle for safety.

PROCEDURE

1. CHECK BRAKE FLUID
(a) Check that the brake fluid level is properly.
NG -- ADD BRAKE FLUID
OK -- Continue to next step.
2. CHECK DTC FOR ABS
(a) Check if other DTCs are recorded (ABS (Antilock Brake System)).
NO -- INSPECT BRAKE WARNING LIGHT
YES -- REPAIR CIRCUIT INDICATED BY OUTPUT DTC
3. INSPECT BRAKE WARNING LIGHT
(a) WHEN USING TECHSTREAM:
(1) Connect Techstream to the DLC3.
(2) Start the engine.
(3) Select the item "Brake Warning Light" in the Active Test and operate the BRAKE warning light on Techstream.

ABS / VSC / TRAC:

(4) Check that "ON" and "OFF" of the BRAKE warning light are indicated on the combination meter when using Techstream.
OK:
Turn the BRAKE warning light on or off in accordance with Techstream.
(b) WHEN NOT USING TECHSTREAM:

(1) Turn the ignition switch off and disconnect the connector from the skid control ECU.
(2) Ground the terminal EBDW of the skid control ECU.
(3) Turn the ignition switch to the ON position.
(4) Check the BRAKE warning light.
OK:
Turn the light on or off in accordance with the connection of the terminal GND and EBDW.
NG -- INSPECT PARKING BRAKE SWITCH ASSEMBLY
OK -- REPLACE BRAKE ACTUATOR ASSEMBLY
4. INSPECT PARKING BRAKE SWITCH ASSEMBLY

(a) Remove the parking brake switch connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPLACE PARKING BRAKE SWITCH ASSEMBLY
OK -- Continue to next step.
5. CHECK HARNESS OR CONNECTOR (SKID CONTROL ECU - PARKING BRAKE SWITCH)

(a) Disconnect the skid control ECU connector and the parking brake switch connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
6. INSPECT BRAKE FLUID LEVEL WARNING SWITCH
(a) Remove the reservoir tank cap and strainer.

(b) Disconnect the brake fluid level warning switch connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPLACE BRAKE FLUID LEVEL WARNING SWITCH
OK -- Continue to next step.
7. CHECK HARNESS OR CONNECTOR (BRAKE FLUID LEVEL WARNING SWITCH - COMBINATION METER)

(a) Disconnect the combination meter connector and the brake fluid level warning switch connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
8. CHECK HARNESS OR CONNECTOR (SKID CONTROL ECU - COMBINATION METER)

(a) Disconnect the skid control ECU connector and combination meter connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE COMBINATION METER ASSEMBLY