Alarm - Operation Changes in Convertible Models

CATEGORY
Electrical

SECTION
3

PAGE
12

ISSUE
09/91-0134

CODE
383

Subject:
Changes in Alarm Operation

Application:
900 Convertible, 1992

A number of significant changes have been made to the operation of the alarm system in 1992 900 convertible models including the addition of a start inhibitor feature and integration with the central locking. Also, the complete alarm system will be factory installed and will not require any dealer installation during PDI. Outlined below are the components that have changed and a description of any new operational function.

^ Remote Disarm Transmitters: Two transmitters are now included with every car. Previously, the car was equipped with one transmitter and one frequency-matched ROM chip that could be installed if the customer wanted two transmitters.

^ Alarm Electronic Control Unit (ECU) Relocation: The alarm ECU is located under the rear seat beam directly behind the drivers seat. A new bracket secures the ECU and houses the starter inhibitor relay and flasher relay and is easily accessed on the front side of the seat beam. To gain access, lift the rear seat bottom and fold down the carpet. A T-30 torx screw secures the bracket to the front side of the seat beam and a locating tab on the back of the bracket fits into a slot under the seat beam.

The central lock ECU is also attached to the bottom of this bracket.

A 5 amp blade type fuse for the alarm system is located in-line in the alarm wiring harness beneath the alarm ECU bracket.

^ Starter Inhibitor Function: A starter inhibitor relay is integrated into the system from the factory. Should the alarm be triggered (set off), the starter inhibitor will prevent the car from being started until it is has been disarmed. The relay is located on the alarm ECU bracket for easy access.

^ Keyless Entry with Arming/Disarming Function: The central locking system is now integrated and controlled by the alarm system remote transmitters. To arm the alarm system and lock the doors and trunk lid, remove the ignition key, exit the car and close the doors. When the transmitter button is depressed, the central locking system will actuate both door locks and trunk lock and the alarm system will verify that it is armed by a short chirp of the siren.

To disarm the system and unlock the doors, press the transmit button. The central locking system will unlock and the siren will chirp twice indicating that the alarm is now disarmed.

Note
The central locking system does not actuate from the driver's door lock (key or lock knob). From the interior of the car, the central lock can be actuated by a new rocker switch located on the center console.

^ Rear Seat-Bottom Wired for Tampering: The rear seat cushion is now wired into the alarm system by forming a ground through the hold down springs to provide anti-tampering protection. Should the rear seat cushion be pulled up, it will activate the alarm if the alarm is armed.

A one-pole connector in the wire can be easily detached to allow the seat bottom to be removed. Be sure this connector is reattached after any work requiring rear seat removal is completed.