Front Cover Removal

The horn will pulse twice to indicate that the trunk key cylinder is in its proper position. Placing the key in the ignition will allow the warning lamp, headlamps and interior lamps to be checked for proper flashing operation. If any door is open the interior lamps will not flash. Remove the ignition key from the ignition switch in order to check for door lock cylinder switch operation. At the completion of each of the following operations, a horn pulse will occur to indicate proper operation. Each action must be separated by a minimum of one second or horn pulse will not occur.
- Activate the power door locks in both the lock and unlock positions.
- Open then close each door one at a time.
- Rotate the ignition key in each of the door lock cylinders to the lock and unlock positions.
- Cycle the ignition switch key to the ON position as the last step. A single horn pulse will indicate proper operation of the ignition switch. This will also take the system out of the stand alone diagnostic mode.

The self diagnostic mode may also be exited by using the scan tool.

Activating the Remote Keyless Entry System (RKE) to exercise any of the above inputs will also cause the horn to pulse. When the RKE lock button is pressed, the RKE module itself will also pulse the horn. This is part of the RKE normal operation.