Antilock Warning Lamp Diode Circuit
NOTE:
For connector terminal identification, see CONNECTOR IDENTIFICATION. For wiring diagram, see wiring diagram.
- Turn ignition on. If ANTI-LOCK warning light does not glow at start-up, go to TEST 3A. If ANTI-LOCK warning light glows at start-up, use scan tool to actuate ANTILOCK LAMP. If ANTI-LOCK warning light does not flash, go to next step. If ANTI-LOCK warning light flashes, go to step 3).
- Turn ignition off. Remove ABS relay. See Figure. Turn ignition on. Using scan tool, actuate ANTILOCK LAMP. If ANTI-LOCK warning light flashes, replace ABS diode, located behind right front fender shield. Perform TEST VER-1A. If ANTI-LOCK warning light does not flash, replace CAB. Perform TEST VER-1A.
- Using scan tool, actuate SYSTEM RELAY. If ANTI-LOCK warning light does not flash, go to next step. If ANTI-LOCK warning light flashes, ANTI-LOCK warning light circuit is functioning properly at this time. Perform TEST VER-1A.
- Turn ignition off. Disconnect CAB 60-pin connector. See Figure. Inspect, clean and repair connector as necessary. Connect jumper wire between chassis ground and CAB connector terminal No. 47 (Red/Light Blue wire). See Figure. If ANTI-LOCK warning light glows, go to next step. If ANTI-LOCK warning light does not glow, go to step 6).
- Using scan tool in ohmmeter mode, check resistance of Black wire at ABS relay connector terminal "E". See Figure. If resistance is more than 5 ohms, repair open in Black wire. Perform TEST VER-1A. If resistance is less than 5 ohms, replace ABS relay. Perform TEST VER-1A.
- Turn ignition on. Access ANTI-LOCK warning light diode, located behind right front fender shield. Connect a jumper wire between chassis ground and Light Green/Orange wire at diode. If ANTI-LOCK warning light does not glow, repair open in Light Green/Orange wire between diode and body splice. Perform TEST VER-1A. If ANTI-LOCK warning light glows, go to next step.
- Disconnect jumper wire. Connect jumper wire between chassis ground and Red/Light Blue wire at diode. If ANTI-LOCK warning light glows, repair open in Red/Light Blue wire between diode and body splice. Perform TEST VER-1A. If ANTI-LOCK warning light does not glow, replace diode. Perform TEST VER-1A.