NO.6 BRAKE SYSTEM WARNING LIGHT STAYS ON 4 S OR MORE WHEN THE IGNITION SWITCH IS TURNED TO THE ON POSITION (PARKING BRAKE IS RELEASED) [L3]

id0403008022a1

6

BRAKE system warning light stays on 4 s or more when the ignition switch is turned to the ON position. (Parking brake is released.)

[TROUBLESHOOTING HINTS]

• Instrument cluster malfunction

• Short to ground in circuit in parking brake switch

• Brake fluid level sensor is low

Diagnostic procedure

STEP

INSPECTION

ACTION

1
INSPECT BRAKE FLUID LEVEL
• Is brake fluid level normal?
Yes
Go to the next step.
No
Add brake fluid.
2
INSPECT FOR DTCs IN ABS HU/CM
• Have DTCs been stored in memory?
Yes
Perform the applicable DTC inspection.
(See DTC Table.)
No
Go to the next step.
3
VERIFY WHETHER MALFUNCTION IS IN PARKING BRAKE SWITCH
• Disconnect the parking brake switch connector.
• Does BRAKE system warning light go out with the ignition switch is turned to the ON position?
Yes
Replace the parking brake switch.
No
Perform the following inspection. Repair if necessary.
• Short to ground in the wiring harness between the instrument cluster (BRAKE system warning light) and parking brake switch.
Inspect the instrument cluster.

*4

INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC -2 FOR CONTINUITY
• Disconnect the ABS HU/CM connector.
• Is there continuity between connector terminal AQ and DLC-2?
Yes
Go to the next step.
No
Repair the wiring harness between the ABS HU/CM and DLC-2.

*5

INSPECT WIRING HARNESS BETWEEN ABS/ HU/CM AND DLC-2 FOR SHORT TO POWER SUPPLY
Is the voltage approx. 12 V at connector terminal AQ?
Yes
Repair the wiring harness between the ABS HU/CM and DLC-2.
No
Go to the next step.

*6

INSPECT WIRING HARNESS BETWEEN ABS HU/CM AND DLC-2 FOR SHORT TO GROUND
Is there continuity between connector terminal AQ and ground?
Yes
Repair the wiring harness between the ABS HU/CM and DLC-2.
No
Replace the ABS HU/CM (communication circuit malfunction in ABS HU/CM).

• When performing an asterisked (*) troubleshooting inspection, slightly shake the wiring harness and connectors while performing the inspection to discover whether poor contact points are the cause of any intermittent malfunction. If there is a problem, verify that the connectors, terminals and wiring harness are connected correctly and undamaged.