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Vehicle Security System Diagnosis

  1. Cycle ignition switch to ACCESSORY position 3 times, leaving ignition in ACCESSORY position. Security system is now in diagnostic mode. Park lights and taillights will flash verifying their operation. The horn will sound twice verifying trunk key cylinder is in proper position.
  2. Return ignition switch to OFF position. Turning ignition off will stop lights from flashing, but keep security system in diagnostic mode. With security system in diagnostic mode, vehicle horn will sound when switches are activated, verifying proper operation of switches.
  3. Begin diagnosis with all doors, hood and trunk closed. Open and close each door with a one-second delay between opening and closing. Vehicle horn will sound when door switch opens and when door switch closes.
  4. Open and close hood. Vehicle horn will sound when hood switch opens and when switch closes. Activate power door locks. Vehicle horn will sound when door locks are activated in LOCK position and again when door locks are activated to UNLOCK position.
  5. Using door key, lock and unlock vehicle doors with a one-second delay between locking and unlocking. Vehicle horn will sound when switch is locked and when switch is unlocked.
  6. Cycle ignition switch to RUN position. Vehicle horn will sound once, indicating ignition input is operating properly. Cycling ignition switch to RUN position will also take security system out of diagnostic mode.
  7. If horn does NOT sound during testing, this indicates no input from switch, faulty wiring or defective security system module. Security system module is located above glove box. If SBEC has been replaced recently, vehicle security system will not function until 20 engine cranks have occurred.
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