Central Locking System
>>BCentral Locking System:
WIRING DIAGRAM
Central Locking System: Component Location:
COMPONENT LOCATION VIEW
Central Locking System: Component ID:
COMPONENT ID
22A Fuse board behind the cover flap in the glove box.
175 Control module, central locking system, on a bracket under the dashboard on the left-hand side.
184 Central locking motor, passenger's door, in the front passenger's door.
185 Central locking motor, rear right-hand door, in the rear right-hand door.
186 Central locking motor, rear left-hand door, in the rear left-hand door.
208 Door lock indication, in the locking mechanism inside each door.
213 Pictogram, in the main instrument display panel.
230 Distribution terminal (+30 circuit) in main fuse box behind the glove box.
274 Microswitch, beside the lock cylinder in the driver's door.
289 Control module, anti-theft alarm, under the dashboard on the right-hand side behind the knee shield.
386 Switch, electric window lifts and sunroof, on the centre console between the front seats.
434 Fuel filler flap motor, central locking system, adjacent to the fuel filler flap.
435 Microswitch, beside the lock cylinder in the front passenger's door.
436 Motor, central locking system, driver's side, in the driver's door.
514A Switch, simultaneous actuation of central locking system, in 386.
2-Pin Connectors
H2-14 in the right-hand front door, beside the locking mechanism.
H2-16 Beside the locking mechanism inside the right-hand front door.
H2-30 In the right-hand rear door, beside the locking mechanism.
H2-34 Beside the locking mechanism inside the left-hand front door.
H2-36 In the left-hand rear door, beside the locking mechanism.
H2-73 Beside the locking mechanism in the driver's door.
H2-74 On the right-hand side in the tug- gage compartment beside the central locking motor for the fuel filter flap.
4-Pin Connectors
H4-13 In the left-hand front door, adjacent to the microswitch.
H4-19 In the passenger's door beside the locking mechanism.
10-Pin Connectors
H10-14 In the luggage compartment to the left beside the rear filament monitor.
H10-22 In right-hand B pillar.
H10-24 In left-hand B pillar.
22-Pin Connectors
H22-1 Behind the cable entry in the left-hand A pillar.
H22-2 Behind the cable entry in the right-hand A pillar.
Grounding Points
G6 Grounding point, negative distribution terminal, in main fuse box 22B behind the glove box.
G8 Grounding point, dashboard, by the left-hand front loudspeaker socket.
G14 Grounding point, left-hand front seat member.
DESCRIPTION OF OPERATION
With the key in the driver's door or front passenger's door, all the car's doors and fuel tank filler cap can be locked and unlocked centrally.
Control module 175 for the central locking system is continuously supplied with current via fuse 16.
The control module is controlled from microswitch 274 in the driver's door, microswitch 435 in the passenger's door or from a switch in switch unit 386 in the centre console.
When the doors are locked, terminal 2 of the control module is grounded and current is supplied for 0.7 seconds to all actuating motors, closing the locks. The motors are grounded via terminal 8.
When the switch 386 in the centre console is activated by pressing the "LOCK" symbol on the switch, terminal 5 of the control module is grounded and current is supplied for 0.7 seconds to all actuating motors, closing the locks. The motors are grounded via terminal 8.
When the driver's or passenger's door is unlocked, terminal 1 of the control module is grounded and current is supplied for 0.7 seconds to all actuating motors, opening the locks. The motors are grounded via terminal 7.
When the switch in the centre console is activated by pressing the part of the switch without a symbol, terminal 6 of the control module is grounded and current is supplied for 0.7 seconds to all actuating motors, opening the locks. The motors are grounded via terminal 7.
If the driver's door is not completely closed and an attempt is made to use the central locking system from this door or from the switch in the centre console, it will not be possible to lock the doors.
If an attempt is made to use the central locking system from the passenger's door when the driver's door is not completely closed the control module will lock the doors, only to unlock them again shortly afterwards.
FAULT DIAGNOSIS HINTS
General
1. Check that fuse 16 is intact and supplied with current.
2. Check the connectors, wiring harness and ground connections.
1. Check that terminal 4 of the control module is supplied with current.
2. Check that current is supplied to pin 8 of the control module when the doors are being unlocked and to pin 7 when they are being locked.
IMPORTANT:
Control module terminals 7 and 8 are live for only about 1 second, so readings on them must be taken at the precise moment when the locking mechanism changes position. In the inactivated position, both outputs are grounded.
Note also that the actuating motors (on testing) should be connected only to terminals 7 and 8 of the control module. Otherwise the motors could be overloaded and damaged.