ABS Indicator Circuit Troubleshooting - With VSA

ABS indicator does not come on


1.Turn the ignition switch ON (II), and watch the ABS indicator.

Does the ABS indicator come on for several seconds?


YES - The system is OK at this time.n


NO - Go to 2.


2.Apply the parking brake.

Does the brake system indicator come on?


YES - Go to 3.


NO - Repair open in the indicator power source circuit.n


3.Turn the ignition switch OFF.

4.Substitute a known-good VSA modulator-control unit.

5.Turn the ignition switch ON (II).

Does ABS indicator come on?


YES - Replace the VSA modulator-control unit.n


NO - Go to 6.


6.Turn the ignition switch OFF.

7.Remove the gauge assembly.

8.Disconnect the gauge assembly connector A (22P).

9.Check for continuity between the gauge assembly connector A (22P) terminal No. 19 and body ground.

 

Is there continuity?


YES - Repair short to body ground in the wire between the gauge assembly and the VSA modulator-control unit.n


NO - Go to 10.


10.Disconnect the gauge assembly connector B (22P).

11.Check for continuity between the gauge assembly connector B (22P) terminal No. 11 and body ground.

 

Is there continuity?


YES - Check for loose terminals in the gauge assembly connectors. If the connectors are OK, replace the gauge assembly.n


NO - Repair open in the wire between the gauge assembly and body ground (G501).n

ABS indicator does not go off, and no DTCs are stored


1.Check the No. 18 (30A) fuse in the under-hood fuse/relay box.

Is the fuse OK?


YES - Reinstall the fuse, and go to 2.


NO - Replace the fuse, and recheck. If the fuse is blown, check for a short to body ground in this fuse circuit. If the circuit is OK, replace the VSA modulator-control unit.n


2.Check the No. 4 (10A) fuse in the under-dash fuse/relay box.

Is the fuse OK?


YES - Reinstall the fuse, and go to 3.


NO - Replace the fuse, and recheck. If the fuse is blown, check for a short to body ground in this fuse circuit. If the circuit is OK, replace the VSA modulator-control unit.n


3.Turn the ignition switch OFF.

4.Disconnect the VSA control unit 47P connector.

5.Measure the voltage between the VSA control unit 47P connector terminal No. 32 and body ground.

 

Is there battery voltage?


YES - Go to 6.


NO - Repair open in the wire between the No. 18 (30A) fuse and the VSA control unit.n

6.Turn the ignition switch ON (II).

7.Measure the voltage between the VSA control unit 47P connector terminal No. 4 and body ground.

 

Is there battery voltage?


YES - Go to 8.


NO - Repair open in the wire between the No. 4 (10A) fuse and the VSA control unit.n


8.Turn the ignition switch OFF.

9.Check for continuity between the VSA control unit 47P connector terminal No. 16 and body ground.

 

Is there continuity?


YES - Check for loose terminals in the VSA control unit 47P connector. If necessary, substitute a known-good VSA modulator-control unit, and recheck.n


NO - Repair open in the wire between the VSA control unit and body ground (G202).n