Door Switches

Door Switches

The anti-theft alarm ECU (C1979 on LHD, C0061 on RHD) monitors the condition of the door switches as follows:

The driver door switch (C0266 on LHD, C2007 on RHD) on an SW wire The front passenger door switch (C0265 on LHD, C0106 on RHD) on a PU wire The LH rear door switch (C0104) on a PU wire The RH rear door switch (C0108) on a PU wire The tail door switch (C0615) on a PU wire – 90 Station Wagons only The tail door switch (C1992) on a PU wire – 110 Station Wagons only The tail door switch (C1993) on a PU wire – 90 Hard top vehicles with Central Door Locking (CDL) only The tail door switch (C1994) on a PU wire – 110 Hard top vehicles with CDL only.

When any of the doors are opened, the relevant door switch contacts close creating an earth path. When the anti-theft alarm ECU registers an earth, it illuminates the interior lamps.

Front Interior Lamp

With the lamp switch in the central position, current flows across the bulb and switch contacts (C0355) to the anti-theft alarm ECU (C1979 on LHD, C0061 on RHD) on a PW wire. When the anti-theft alarm ECU registers an earth path via the door switches, it provides an earth path to illuminate the front interior lamp.

With the lamp switch in the 'On' position, current flows across the bulb and switch contacts (C1210) to earth on a B wire.

With the lamp switch in the 'Off' position, current cannot flow across the bulb and switch contacts.