Troubleshooting

Anti-lock Brake System Indicator Light

Temporary Driving Conditions:
1. The anti-lock brake system indicator light comes on and the control unit memorizes the problem under certain conditions.

NOTE: Problem codes are explained on page 19-60.

•   The tire(s) adhesion is lost due to excessive cornering speed.
Problem codes: 5, 5-4, 5-8.
•   The vehicle loses traction when starting from a stuck condition on a muddy, snowy, or sandy road.
Problem code: 4-1, 4-2, 4-4, 4-8.
•   When the parking brake is applied for more than 30 seconds while the vehicle is being driven. Problem code: 2-1.
•   The vehicle is driven on an extremely rough road.

2. The anti-lock brake system is OK if the anti-lock brake system indicator light goes off after the engine is restarted.

3. If you receive a customer's report that the anti-lock brake system indicator light sometimes comes on, check the system using the ALB checker to confirm whether there is any trouble in the system. See page 19-55.

4. The anti-lock brake system indicator light will come on and the control unit will memorize a problem code when there is insufficient battery voltage to the control unit. An example would be when the battery is so weak that the car must be jumpstarted. After the battery is sufficiently recharged, the anti-lock brake system indicator light will work normally after the engine is stopped and restarted.

However, after recharging the battery, the problem code must be cleared from the control unit's memory by disconnecting the ABS B2 (15 A) fuse for at least 3 seconds.
Anti-lock Brake System Indicator Light Circuit:

CAUTION: Use only the digital multimeter to check the system.

1. The indicator light does not go on when the ignition switch is turned on.

Check the following items. If they are OK, check the control unit connectors. If not loose or disconnected, substitute a known-good control unit and recheck:

•   Blown anti-lock brake system indicator light bulb.
•   Open circuit in YEL wire between the No. 15 BACK-UP LIGHT (10 A) fuse and gauge assembly.
•   Open circuit in BLU/RED wire between the gauge assembly and control unit.
•   Poor ground connection between the control unit and the body.

2. The anti-lock brake system indicator light remains ON after the engine is started, however the antilock brake system indicator light does not blink any code or sub-code. Check the following items:

•   Loose or poor connection of the wire harness at the control unit.
•   Faulty ABS B2 (15 A) fuse.
•   Open circuit in WHT wire between the ABS 82 (15 A) fuse and control unit.
•   Open circuit in BLK/YEL wire between the No. 13 RR DEF RLY/HEATER MOTOR RLY/ COOLING FAN MOTOR RLY (7.5 A) fuse and control unit.
•   Short circuit in BLU/RED wire between gauge assembly and control unit.
•   Open circuit in WHT/BLU wire between alternator and control unit.

If the problem is not found, substitute a known-good control unit and recheck whether the anti-lock brake system indicator light remains ON.