| 1. | Check for the communication between the vehicle and the HDS. Is there the communication? YES - Check for loose terminals in the gauge control module (tach) connector (36P). If necessary, substitute a known-good gauge control module (tach), then recheck. If it is OK, replace the original gauge control module (tach).n NO - If the HDS does not communicate with all the system of the vehicle, troubleshoot the DLC circuit: R18A1 engine model, K20Z2 engine model. If the HDS does not communicate with only VSA, go to 2. |
| 2. | Check the No. 4 (7.5 A) fuse in the under-dash fuse/relay box. Is the fuse blown? YES - Install the new No. 4 (7.5 A) fuse, and recheck.n NO - Reinstall the checked fuse, then go to 3. |
| 3. | Turn the ignition switch OFF. |
| 4. | Disconnect the VSA modulator-control unit 37P connector. |
| 5. | Turn the ignition switch ON (II). |
| 6. | Measure voltage between VSA modulator-control unit 37P terminal No. 28 and body ground.
Is there battery voltage? YES - Go to 7. NO - Repair open in the wire between the No. 4 (7.5 A) in the under-dash fuse/relay box and the VSA modulator-control unit.n |
| 7. | Turn the ignition switch OFF. |
| 8. | Check for continuity between VSA modulator-control unit 37P terminal No. 36 and body ground.
Is there continuity? YES - Check for loose terminals in the VSA modulator-control unit 37P connector, clean terminal G202 and recheck. If necessary, substitute a known-good VSA modulator-control unit and retest.n NO - Repair open in the wire between the VSA modulator-control unit and body ground (G202).n |