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:


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 (A) from the immobilizer control unit-receiver (B).

 

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 ON (II).

Is there battery voltage?


YES - Go to 7.


NO - Check for these problems:n

  • 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 ECM/PCM, 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 - Replace the immobilizer control unit-receiver. After replacing the immobilizer control unit-receiver, rewrite the unit with a HDS.n


NO - Repair open in the RED/BLU wire.n