VSA System Symptom Troubleshooting Index

VSA System Symptom Troubleshooting Index - Indicator Circuit

When the vehicle has one of these symptoms, check for a diagnostic trouble code (DTC) with the HDS. If there is no DTC, do the diagnostic procedure for the symptom, in the sequence listed, until you find the cause.

Symptom Diagnostic procedure
HDS does not communicate with the VSA modulator-control unit or the vehicle Troubleshoot the DLC circuit: R18A1 engine model, K20Z2 engine model.
ABS indicator does not come on 1.

2. Do the gauge control module troubleshooting.
Substitute a known-good VSA modulator-control unit, then recheck. If it is OK, replace the original VSA modulator-control unit.
ABS indicator does not go off, and no DTCs are stored 1.

2. Do the gauge control module troubleshooting.
Symptom Troubleshooting.
Brake system indicator does not come on 1.

2. Do the gauge control module troubleshooting.
Substitute a known-good VSA modulator-control unit, then recheck. If it is OK, replace the original VSA modulator-control unit.
Brake system indicator does not go off Do the gauge control module troubleshooting.
VSA indicator does not come on 1.

2. Do the gauge control module troubleshooting.
Substitute a known-good VSA modulator-control unit, then recheck. If it is OK, replace the original VSA modulator-control unit.
VSA indicator does not go off, and no DTCs are stored 1.

2. Do the gauge control module troubleshooting.
Symptom Troubleshooting.
VSA activation indicator does not come on at start-up (bulb check) 1.

2. Do the gauge control module troubleshooting.
Substitute a known-good VSA modulator-control unit, then recheck. If it is OK, replace the original VSA modulator-control unit.
VSA activation indicator does no go off, and no DTCs are stored 1.

2.

3. Do the gauge control module troubleshooting.
Substitute a known-good VSA modulator-control unit, then recheck. If it is OK, replace the original VSA modulator-control unit.
Symptom Troubleshooting.
ABS indicator, brake system indicator and VSA indicator do not go off at the same time 1.

2.
Do the gauge control module troubleshooting.
Symptom Troubleshooting.

Symptom	Diagnostic procedure
HDS does not communicate with the VSA modulator-control unit or the vehicle	Troubleshoot the DLC circuit: R18A1 engine model, K20Z2 engine model.
ABS indicator does not come on	1. 2.	Do the gauge control module troubleshooting. Substitute a known-good VSA modulator-control unit, then recheck. If it is OK, replace the original VSA modulator-control unit.
ABS indicator does not go off, and no DTCs are stored	1. 2.	Do the gauge control module troubleshooting. Symptom Troubleshooting.
Brake system indicator does not come on	1. 2.	Do the gauge control module troubleshooting. Substitute a known-good VSA modulator-control unit, then recheck. If it is OK, replace the original VSA modulator-control unit.
Brake system indicator does not go off	Do the gauge control module troubleshooting.
VSA indicator does not come on	1. 2.	Do the gauge control module troubleshooting. Substitute a known-good VSA modulator-control unit, then recheck. If it is OK, replace the original VSA modulator-control unit.
VSA indicator does not go off, and no DTCs are stored	1. 2.	Do the gauge control module troubleshooting. Symptom Troubleshooting.
VSA activation indicator does not come on at start-up (bulb check)	1. 2.	Do the gauge control module troubleshooting. Substitute a known-good VSA modulator-control unit, then recheck. If it is OK, replace the original VSA modulator-control unit.
VSA activation indicator does no go off, and no DTCs are stored	1. 2. 3.	Do the gauge control module troubleshooting. Substitute a known-good VSA modulator-control unit, then recheck. If it is OK, replace the original VSA modulator-control unit. Symptom Troubleshooting.
ABS indicator, brake system indicator and VSA indicator do not go off at the same time	1. 2.	Do the gauge control module troubleshooting. Symptom Troubleshooting.