Door Switches

Door Switches

In order for the perimetric alarm system to operate, the anti-theft alarm ECU monitors the condition of the door switches. The door switches are open circuit when the doors are closed. When the doors are opened, the switches close and an earth path is created. The anti-theft alarm ECU (C1979 on LHD, C0061 on RHD) is connected to the door switches as follows:

To the driver door switch (C0266 on LHD, C2007 on RHD) on an SW wire To the front passenger door switch (C0265 on LHD, C0106 on RHD) on a PU wire To the LH rear passenger door switch (5 door vehicles only) (C0104) on a PU wire To the RH rear passenger door switch (5 door vehicles only) (C0108) on a PU wire To the tail door switch (C0615 on 90 Station Wagons, C1992 on 110 Station Wagons, C1993 on 90 Hard Tops, C1994 on 110 Hard Tops) on a PU wire.

NOTE: The anti-theft alarm ECU treats the passenger doors and the tail door as a single item.

Bonnet Switch

In addition to the door switches, the anti-theft alarm ECU also monitors the condition of the bonnet switch. The bonnet switch is open circuit when the bonnet is closed. When the bonnet is opened, the switch contacts close and an earth path is created.

The anti-theft alarm ECU (C1979 on LHD, C0061 on RHD) provides a feed to the bonnet switch (C1981 on LHD, C0007 on RHD) on an OU wire. The switch is earthed on a B wire.

Volumetric Sensor

The anti-theft alarm ECU (C1979 on LHD, C0061 on RHD) provides a feed to the volumetric sensor (C0719 on Truck Cabs, C0359 on Station Wagons) on a BN wire. The volumetric sensor (C0719 on Truck Cabs, C0359 on Station Wagons) is earthed on a B wire. When the alarm is armed, the volumetric sensor (C0719 on Truck Cabs, C0359 on Station Wagons) provides a feed to the anti-theft alarm ECU (C1979 on LHD, C0061 on RHD) on a WB wire. If the sensor detects any movement within the passenger compartment, it replaces the feed with a pulsed signal. If the anti-theft alarm ECU receives a pulse of greater than 50 mS or three pulses within 1 second, it will trigger the alarm system.