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Section 107 (Immobilizer System): Troubleshooting

WARNING: This page is about a different car, the 2006 Honda Odyssey and 2005 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn the ignition switch ON (II) with a programmed key.
  2. Check to see if the immobilizer indicator comes on.

    Does the indicator come on? 

    1. YES  - Go to step 3.
    2. NO  - Go to step  12 .
  3. Check the immobilizer indicator operation.

    Does the indicator come on for 2 seconds, then go off? 

    1. YES  - Go to step 4.
    2. NO  - Go to step  6 .
  4. Try to crank the engine.

    Does the starter motor operate? 

    1. YES  - Go to step 5.
    2. NO  - Check the starter motor.
  5. Try to start the engine.

    Does the engine start? 

    1. YES  - Check the Status Log in the Immobilizer Info with the HDS (see STATUS LOG  ).
    2. NO  - Go to step  27 .
  6. Check to see if the immobilizer indicator comes on and blinks.

    Does the indicator blink? 

    1. YES  - Go to step  27 .
    2. NO  - Go to step 7.
  7. Disconnect the 7P connector from the immobilizer control unit-receiver.
  8. Check to see if the immobilizer indicator goes off.

    Does the indicator go off? 

    1. YES  - Substitute a known-good immobilizer control unit-receiver and/or PCM.
    2. NO  - Go to step 9.
  9. Turn the ignition switch OFF.
  10. Remove the gauge control module and disconnect its connectors (see GAUGE CONTROL MODULE REPLACEMENT ).
  11. Check for continuity between the immobilizer control unit-receiver 7P connector No. 5 terminal and body ground.
    Fig 1: Checking Continuity Between Immobilizer Control Unit-Receiver 7P Connector Terminal 5 And Body Ground
    G03706890Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Repair a short in the wire.
    2. NO  - Faulty immobilizer indicator, replace the gauge control module.
  12. Try to start the engine.

    Does the engine start? 

    1. YES  - Go to step 13.
    2. NO  - Go to step  19 .
  13. Turn the ignition switch OFF.
  14. Disconnect the 7P connector from the immobilizer control unit-receiver.
  15. Check for voltage between the immobilizer control unit-receiver 7P connector No. 7 terminal and body ground.
    Fig 2: Checking Voltage Between Immobilizer Control Unit-Receiver 7P Connector Terminal 7 And Body Ground
    G03706891Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Go to step 16.
    2. NO  - Faulty No. 7 (7.5 A) fuse in the driver's under-dash fuse/relay box. If the fuse is OK, check for an open in the wire between the immobilizer control unit-receiver and driver's under-dash fuse/relay box.
  16. Using a jumper wire, connect the immobilizer control unit-receiver No. 5 terminal to ground.
    Fig 3: Connecting Immobilizer Control Unit-Receiver Terminal 5 To Ground
    G03706892Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Does the indicator come on? 

    1. YES  - Replace the immobilizer control unit-receiver.
    2. NO  - Go to step 17.
  17. Remove the gauge control module and disconnect its 30P connector (see GAUGE CONTROL MODULE REPLACEMENT ).
  18. Check for continuity between the immobilizer control unit-receiver 7P connector No. 5 terminal and gauge control module connector A (30P) No. 16 terminal.
    Fig 4: Checking Continuity Between Immobilizer Unit-Receiver 7P Connector Terminal 5 And Gauge Control Module Connector A (30P) Terminal 16
    G03706893Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Faulty immobilizer indicator, replace the gauge control module.
    2. NO  - Repair an open in the wire.
  19. Turn the ignition switch OFF.
  20. Disconnect the 7P connector from the immobilizer control unit-receiver.
  21. Turn the ignition switch ON (II).
  22. Check for voltage between the immobilizer control unit-receiver 7P connector No. 6 terminal and body ground.
    Fig 5: Checking Voltage Between Immobilizer Control Unit-Receiver 7P Connector Terminal 6 And Body Ground
    G03706894Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Go to step 23.
    2. NO  - Faulty No. 19 (15 A) fuse in the driver's under-dash fuse/relay box. If the fuse is OK, check for an open in the wire between the immobilizer control unit-receiver and driver's under-dash fuse/relay box.
  23. Check for voltage between the immobilizer control unit-receiver 7P connector No. 1 and No. 6 terminals.
    Fig 6: Checking Voltage Between Immobilizer Control Unit-Receiver 7P Connector Terminals 1 And 6
    G03706895Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there battery voltage? 

    1. YES  - Substitute a known-good immobilizer control unit-receiver control and recheck.
    2. NO  - Go to step 24.
  24. Turn the ignition switch OFF.
  25. Jump the SCS line with the HDS, then disconnect PCM connector A (44P) (see HOW TO TROUBLESHOOT CIRCUITS AT THE PCM CONNECTORS ).
  26. Check for continuity between the immobilizer control unit-receiver 7P connector No. 1 terminal and PCM connector A (44P) No. 22 terminal.
    Fig 7: Checking Continuity Between 7P Connector Terminal 1 And PCM Connector A Terminal 22
    G03706896Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Check the PCM terminals B36, B43 and C1 for poor connections to G101 and terminals B1 and C40 for poor connections to G102. If OK, substitute a known-good immobilizer control unit-receiver and recheck.
    2. NO  - Repair an open in the wire.
  27. Turn the ignition switch OFF.
  28. Connect the HDS to the data link connector.
  29. Turn the ignition switch ON (II).
  30. Look at the System Check in the Immobilizer Info with the HDS (see SYSTEM CHECK  ).

    Is the immobilizer system normal? 

    1. YES  - Go back to step  1 .
    2. NO  - Go to step 31.
  31. Verify the System Check display on the HDS for the following information:
    • Harness short from the PCM to the immobilizer unit. (S-net line short)
    • The communication was not good between the PCM and the immobilizer unit by the battery voltage low.
    • The communication was not good between the immobilizer unit and the PCM by influence of some noise.
    • Immobilizer unit failure
    • PCM failure

    Does the HDS display any of the above information? 

    1. YES  - Go to step 32.
    2. NO  - Go to step  36 .
  32. Turn the ignition switch OFF.
  33. Disconnect the 7P connector from the immobilizer control unit-receiver.
  34. Jump the SCS line with the HDS, then disconnect PCM connector A (44P) (see HOW TO TROUBLESHOOT CIRCUITS AT THE PCM CONNECTORS ).
  35. Check for continuity between the immobilizer control unit-receiver 7P connector No. 2 terminal and body ground.
    Fig 8: Checking Continuity Between Immobilizer Control Unit-Receiver 7P Connector Terminal 2 And Body Ground
    G03706897Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Repair a short in the wire.
    2. NO  - Substitute a known-good immobilizer control unit-receiver and/or PCM.
  36. Verify the System Check display on the HDS for the following information:
    • Blown fuse
    • Harness open from the PCM and the immobilizer unit.
    • The communication was not good between the PCM and the immobilizer unit by battery voltage low.
    • The communication was not good between the immobilizer unit and the PCM by the battery voltage low.
    • The communication was not good between the immobilizer unit and the PCM by influence of some noise.
    • Immobilizer unit failure
    • PCM failure

    Does the HDS display any of the above information? 

    1. YES  - Go to step 37.
    2. NO  - Check the Possible Failures shown on the System Check display (see SYSTEM CHECK  ).
  37. Turn the ignition switch OFF.
  38. Disconnect the 7P connector from the immobilizer control unit-receiver.
  39. Jump the SCS line with the HDS, then disconnect PCM connector A (44P) (see HOW TO TROUBLESHOOT CIRCUITS AT THE PCM CONNECTORS ).
  40. Check for continuity between the immobilizer control unit-receiver 7P connector No. 2 terminal and PCM connector A (44P) No. 44 terminal.
    Fig 9: Checking Continuity Between Immobilizer Control Unit-Receiver 7P Connector Terminal 2 And PCM Connector A (44P) Terminal 44
    G03706898Courtesy of AMERICAN HONDA MOTOR CO., INC.

    Is there continuity? 

    1. YES  - Substitute a known-good immobilizer control unit-receiver and recheck the system. If the immobilizer control unit-receiver is OK, substitute a known-good PCM and recheck (see PCM UPDATING AND SUBSTITUTION FOR TESTING ).
    2. NO  - Repair an open in the wire.
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