Operation CHARM: Car repair manuals for everyone.

System Components

System components

Security system ECU



The security system ECU is microprocessor based for direct interface with vehicle inputs, RF transmitter reception, alarm outputs and control of certain vehicle Systems. The ECU is mounted behind the right rear trunk trim panel.

Shock sensor
The standard equipment shock sensor detects impacts or jarring motions and inputs directly to the security system ECU. The shock sensor is mounted to the ECU case.

Back-up battery
The back-up battery will power the security system ECU and drive the alarm sounder in the event of vehicle battery disconnection. The back-up battery is also mounted to the ECU case.

Security sounder



The sounder is a powerful speaker located ahead of the left front wheel arch.

Relays



Two relays are included in the security system: a normally-open (light blue case) relay for headlight operation, and a change-over (violet case) relay for starter disable. The relays are mounted on a bracket located on the left blower housing.

Key fob RF transmitter



The transmitter has a single button to operate all security system functions. Since the transmitter is RF (radio frequency), it does not have to be aimed at the vehicle. The operating range of the transmitter is approximately 20 feet

Antenna
The antenna receives RF transmissions from the key fob transmitter and is positioned behind the right rear quarter interior trim panel.

Valet switch



The valet switch disables the security system theft protection functions while allowing the use of the convenience features (remote central locking and headlights ON). The valet switch is located on the right side of the steering column cover.

Warning LED



The warning LED provides a visual indication of the security system status (one flash per second with the system enabled and armed, or with the system disabled and the doors locked). The warning LED is positioned at the top of the steering column cover.