ABS Light: Testing and Inspection

1. If the anti-lock warning light does not come on with ignition switch turned on, check the following items:
a. Blown anti-lock warning bulb.
b. Open circuit in YEL lead between No. 13 fuse and combination meter.
c. Open circuit in BLU/RED lead between combination meter and control unit.
d. Bad ground connection of control unit to body.
2. If no problems are found, install a known-good control unit and recheck above items.
3. If the anti-lock warning light remains on and no trouble codes exist, check the following:
a. Loose or poor connection of wire harness at control unit.
b. Blown ABS fuse.
c. Open circuit in WHT lead between ABS fuse and control unit.
d. Open circuit in YEL/BLK lead between fuse No. 17 and fail safe relays.
e. Open or short circuit in YEL/GRN lead between fail safe relays.
f. Short circuit in BLU/RED lead between combination meter and control unit.
g. Open circuit in WHT/BLU lead between alternator and control unit.
4. If no problems are found, install a known-good control unit and recheck warning light operation.