## Immobilizer System Troubleshooting

Before troubleshooting the immobilizer system, troubleshoot any ECM/PCM with Diagnostic Trouble Codes (DTCs),and make sure the ECM/PCM has no malfunction.
Note these items before troubleshooting:

- Due to the action of the immobilizer system, the engine takes slightly more time to start than on a vehicle without an immobilizer system.
- When the system is normal, and the proper key is inserted, the indicator light comes on for 2 seconds, then it will go off.
- If the indicator starts to blink after 2 seconds, or if the engine does not start, repeat the starting procedure.
  If the engine still does not start, continue with this procedure.

1. | Turn the ignition switch ON (II) with proper key.

2. | Check to see if the immobilizer indicator light comes on. Does the indicator light blink? YES - Go to 3. NO - Check for these problems:n Blown No. 8 (15A) fuse in the under-hood fuse/relay box. An open in the BLU/ORN wire between the gauge assembly and the immobilizer control unit-receiver. Faulty immobilizer indicator light. If all the check prove OK go to 3.

3. | Remove the steering column covers.

4. | Disconnect the 7P connector from the immobilizer control unit-receiver.

5. | Check for voltage between the immobilizer control unit-receiver 7P connector No. 7 terminal and body ground. Is there battery voltage? YES - Go to 6. NO - Check for these problems:n Blown No. 8 (15A) fuse in the under-hood fuse/relay box. An open in the WHT/RED wire.

6. | Check for voltage between the immobilizer control unit-receiver 7P connector No. 6 terminal and body ground with the ignition switch 0N (II). Is there battery voltage? YES - Go to 7. NO - Check for these problems: Blown No. 20 (15A) fuse in the under-hood fuse/relay box. Faulty PGM-FI main relay 1. An open in the YEL/BLK wire.

7. | Check for voltage between the immobilizer control-unit receiver 7P connector No. 4 terminal and body ground with the parking brake lever pulled, then released. Is there 1 V or less (pulled), then 5 V or more? (Released) YES - Go to 8. NO - Check for these problems:n Faulty parking brake switch or a poor body ground of the parking brake switch. Faulty brake fluid level switch. An open in the GRN/ORN wire. Faulty brake indicator light.

8. | Check for continuity between the immobilizer control unit-receiver 7P connector No. 1 terminal and body ground. Is there continuity? YES - Go to 9. NO - Check for these problems:n Poor ground (G101). Faulty ECMPCM, or disconnect ECM/ PCM connector.n An open in the BRN/YEL wire.

9. | Check for continuity between the immobilizer control unit-receiver 7P connector No. 2 terminal and ECM/PCM terminal E27. Is there continuity? YES - Go to 10. NO - Repair open in the RED/BLU wire.n

10. | Check for continuity between the immobilizer control unit-receiver 7P connector No. 2 terminal and the Imoes unit connector terminal No. 2. Is there continuity? YES - Replace the immobilizer control unit-receiver. After replacing the immobilizer control unit-receiver, rewrite the unit with a Honda PGM- Tester.n NO - Repair open in the RED/BLU wire. If the harness is OK, check to see if there is any input test for the Imoes unit.n