Central Locking System

�@BCentral Locking System:

WIRING DIAGRAM

Central Locking System: Component Location:

COMPONENT LOCATION VIEW

Central Locking System: Component ID:

COMPONENT ID
22A Main fuse board in the dashboard.
175 Control module, central locking system, in the cabin on the right-hand side.
184 Central locking motor in the passenger's door.
185 Central locking motor in the right-hand rear door.
186 Central locking motor in the left-hand rear door.
274 Microswitch, in the driver's door.
434 Fuel filler flap motor, central locking system, adjacent to the fuel filler flap.
435 Locking mechanism in the passenger's door.
436 Motor, central locking system, in the driver's door.

10-Pin Connectors
H10-6 In left-hand B pillar.
H10-7 In right-hand B pillar.

26-Pin Connectors
H26-1 Connector, left-hand front door.
H26-2 Connector, right-hand front door.

33-Pin Connector
H33-1 Grey connector on the bracket below the left-hand A pillar.

Grounding Points
G24 Grounding point, right-hand front seat member, under the seat.
G35 Grounding point, dashboard, behind the connector bracket below the left-hand A pillar.

Description of Operation
With the key in the driver's door or passenger's door, the central locking system can be actuated to lock and unlock all the doors of the car and the fuel filler flap.

Pin 4 of central locking system control module 175 is supplied with current via fuse 25.

With the ignition switch in the Drive position, pin 3 of the control module is supplied with current (+54 circuit) via fuse 20.

The control module is controlled from microswitch 274 in the driver's door, which attends to both locking and unlocking the central locking system.

When the car is locked from the passenger's door, microswitch 274 controls the central locking system control module.

When the car is unlocked from the passenger's door, locking mechanism 435 in the passenger's door controls the central locking system control module.

When the driver's door is locked, pin 2 of the control module is grounded and current is supplied to all actuating motors for 1 second via pin 7 of the control module, thus locking the doors.

When the passenger's door is locked, pin 5 of the control module is grounded and current is supplied to all actuating motors for 1 second via pin 7 of the control module, thus locking the doors.

When the driver's door or passenger's door is unlocked, pin 6 of the control module is grounded and current is supplied to all actuating motors for 1 second via pin 8 of the control module, thus unlocking the doors.

Central Locking Anti-theft Protection
By means of the key in the driver's door it is possible to secure all the car's locks centrally against theft (deadlock), i.e. the central locking motor is blocked so that it cannot be actuated by means of the lock buttons.

Turning the key in the driver's door past the locking position to the deadlock position, 90° below the neutral position, causes pin 12 of the control module to be grounded for about 0.1 seconds, following which pin 12 is supplied with current for about 1 second via a logic circuit.

The central locking system is now protected against theft, which can be seen from the position of the lock bolt in the driver's door, i.e. the cylinder does not spring back to the neutral position.

When unlocking from the deadlock position, the key is turned back to the unlocked position through 135° from the deadlock position.

The deadlock function can only be used after central locking and can only be operated from the lock cylinder in the driver's door.

FAULT DIAGNOSIS HINTS
1. Check that fuses 25 and 20 are intact and supplied with current.
2. Check that current is present on pins 4 and 3 of the control module.
3. Check that current is present on pin 7 of the control module when the doors are being locked and on pin 8 when they are being unlocked.

IMPORTANT:
Since pins 7 and 8 of the control module are supplied with current for only about 1 second, instrument readings must be taken at the exact moment the locking mechanism switches over.

Note also that the actuating motors (on testing) should be connected only to pins 7 and 8 of the control module. Otherwise the motors could be overloaded and damaged.

When the control module is not activated, pins 7 and 8 are both connected to ground.

4. Check the connectors, wiring harness and ground connections.