ABS Indicator Circuit Troubleshooting

ABS Indicator Circuit Troubleshooting
1. Turn the ignition switch ON (II), and watch the ABS indicator.
Does the ABS indicator come on?
YES - If the ABS indicator comes on and goes off, it's OK. If the ABS indicator stays on, go to step 13.
NO - Go to step 2.
2. Turn the ignition switch OFF then ON (II) again.
Does the brake system indicator come on?
YES - Go to step 3.
NO - Repair open in the brake system indicator circuit.
- Blown BACK-UP LIGHT (7.5 A) fuse.
- Open in the wire between the BACK-UP LIGHT (7.5 A) fuse and the gauge assembly.
- Open circuit inside the fuse box.
3. Turn the ignition switch OFF.
4. Disconnect the ABS control unit connector B (12P).
5. Turn the ignition switch ON (II).
Does the ABS indicator come on?
YES - Check for loose ABS control unit connectors. If necessary, substitute a known-good ABS control unit, and recheck.
NO - Go to step 6.
6. Check the ABS indicator bulb in the gauge assembly.
Is the bulb OK?
YES - Go to step 7.
NO - Replace the ABS indicator bulb.
7. Turn the ignition switch OFF.
8. Disconnect the gauge assembly 16P connector.





9. Check for continuity between the gauge assembly 16P connector terminal No. 10 and body ground.
Is there continuity?
YES - Repair short to body ground in the wire between the gauge assembly and the ABS control unit.
NO - Go to step 10.
10. Connect the gauge assembly 16P connector.
11. Connect the gauge assembly 22P connector terminal No. 16 to body ground with a jumper wire.





12. Turn the ignition switch ON (II).
Does the ABS indicator come on?
YES - Repair open in the wire between the gauge assembly and body ground (G501).
NO - Replace the printed circuit board in the gauge assembly.
13. Check the POWER MIRROR (7.5A) fuse in the under-dash driver's fuse/relay box, and reinstall the fuse if it is OK.
Is the fuse OK?
YES - Go to step 14.
NO - Replace the fuse, and recheck.





14. Connect the ABS control unit connector terminal A1 to body ground with a jumper wire.
15. Turn the ignition switch ON (II).
Does the ABS indicator go off?
YES - Repair open in the wire between the ABS control unit and body ground (G304).
NO - Go to step 16.





16. Measure the voltage between the ABS control unit connector terminal All and body ground.
Is there battery voltage?
YES - Go to step 17.
NO - Repair open in the wire between the CLOCK (7.5 A) fuse and the ABS control unites





17. Connect the ABS control unit connector terminal B1 to body ground with a jumper wire.
Does the ABS indicator go off?
YES - Check for loose ABS control unit connectors. If necessary, substitute a known-good ABS control unit, and recheck.
NO - Go to step 18.





18. Connect the gauge assembly 16P connector terminal No. 10 to body ground with a jumper wire.
Does the ABS indicator go off?
YES - Repair open in the wire between the gauge assembly and the ABS control unit.
NO - Replace the printed circuit board in the gauge assembly.