For 1990-2009 cars

SYMPTOM | PROCEDURE
--- | ---
Decklid/Liftgate inoperative, LOCK and UNLOCK operate normally. | CHART 10
LOCK and UNLOCK functions on transmitter and interior door switches inoperative. DECKLID/LIFTGATE operates normally. |

• | Check circuit 450 for open between IPFB and RIGHT Body Ground Splice back.

• | If OK, replace body control module (BCM).

LOCK function inoperative, UNLOCK function operates normally. | CHART 11
Transmitters will not synchronize or program. | CHART 12
DRL lamps do not flash when alarm is activated. | CHART 13
No horn activation when door is opened, security system armed. | CHART 14
No horn activation or DRL lamp flash when ignition is turned on with security system armed. | CHART 15
Dome lamp operates in ON position, but not in DOOR position. | CHART 16
Key cannot be removed from ignition lock. | CHART 17
Steering wheel will not unlock. | CHART 18
Key difficult to remove from ignition lock. | CHART 19
LOCK function inoperative, only driver door UNLOCK function operates. |

• | Monitor ALL LOCK RELAY FEEDBACK on Scan tool while activating locks.

• | Feedback should follow command.

• | If not, check Door Lock Relay in IPFB or circuit 195, for open/short-to-ground.

• | If OK, replace body control module (BCM).

LOCK and UNLOCK functions inoperative for Driver door. LOCK and UNLOCK functions for all other doors operate normally. |

• | Check for open circuit 294 or 295 or driver door lock motor.

• | Check driver door jamb switch.

• | If OK, replace body control module (BCM).

UNLOCK function inoperative for all doors except Driver door. LOCK function operates normally. |

• | Monitor Passenger Unlock Relay Feedback on Scan tool while activating locks.

• | Feedback should follow command.

• | If not, check for open circuit 194 or Other Doors Unlock Relay.

• | If OK, replace body control module (BCM).

Driver door LOCK inoperative. Switch also does not lock other doors. Passenger door switch operates normally. |

• | Check for open/short-to-ground in CKT 340 or CKT 780 between IPFB and driver door switch.

• | Check driver door switch.

• | If OK, replace body control module (BCM).

Passenger door LOCK inoperative. Switch also does not lock other doors. Driver door switch operates normally. |

• | Check for open/short-to-ground in CKT 340 or 781 between IPFB and passenger door switch.

• | Check passenger door switch.

• | If OK, replace body control module (BCM).

Driver door UNLOCK inoperative. Switch also does not unlock other doors. Passenger door switch operates normally. |

• | Check for open/short-to-ground in CKT 340 or 780 between IPFB and driver door switch.

• | Check driver door switch.

• | If OK, replace body control module (BCM).

Passenger door UNLOCK inoperative. Switch also does not unlock other doors. Driver door switch operates normally. |

• | Check for open/short-to-ground in CKT 340 or 781 between IPFB and passenger door switch.

• | Check passenger door switch.

• | If OK, replace body control module (BCM).