Theft alarm system – circuit operation

THEFT ALARM SYSTEM – CIRCUIT OPERATION

CIRCUIT OPERATION

For 1996 models a vehicle alarm system is available as original equipment. Three different functions are integrated into the Theft Alarm System: 3. The main function of the system is to offer easy-to-use remote locking and unlocking of the vehicle (Central Locking). 4. Anti-Theft System function. 5. Engine Immobilisation function. NOTE: The Theft Alarm ECU (Z163) is fully programmable to meet different market requirements; therefore some of the features listed will vary dependent on vehicle model or territory.

ALARM COMPONENTS

1. Theft Alarm Unit (Z163) 2. Handset Transmitter 3. Passive Immobilisation Coil (Z270) (Not on all vehicles!) 4. Alarm Sensor (X213) (Not on all vehicles!) 5. Lock Actuators (M114, M122, M117, M125, M132) 6. Alarm Bonnet Switch (X212) (Not on all vehicles!) 7. Right Front Door Key Switch (X202) 8. Door Switches (X150, X118, X142, X163) 9. Rear End Door Switch (X265) 10. Direction Indicator Lamps (Hazard Lamps) 11. Battery Backed Up Alarm Sounder (Z272) (Not on all vehicles!) 12. Alarm Sounder (Z171) and Sounder Relay (K160) (Not on all vehicles!) 13. Theft Alarm LED and Engine Immobilised Warning Lamp (EIWL) (Included in the Instrument Cluster (Z142)) 14. Engine Immobilisation Control Unit (Z171) MFI-V8 and 300 Tdi without EDC Engines only (Not on all vehicles!)

Central Locking FUNCTION

Central Locking is controlled by the Theft Alarm Unit (Z163) and may be locked by using the driver’s door key, sill button(s) or handset. The vehicle may be unlocked by using the handset or EKA code.

NOTE: The central door locking system will shut down for a period of approximately 15 seconds if the Theft Alarm Unit (Z163) determines that the Lock Actuators could be overheating.

ANTI-THeft System Function

The alarm system offers the following forms of protection: Perimetric protection against unauthorised
opening of all doors, tailgate, and bonnet. Engine crank inhibit against unauthorised engine
crank. Electronic engine immobilisation against
unauthorised engine start. Volumetric protection against intrusion into the
passenger compartment. NOTE: Perimetric protection is also triggered by the driver’s door sill switch being lifted and the ignition switch being turned on.