System Without Deadlock

General






The central locking unit is used to simultaneously lock or unlock all the doors, trunk/tailgate and tank cover The central locking system is activated via a key in either into either of the front doors or trunk/tailgate. The central locking system is controlled by a central locking relay located in the electrical distribution box in the passenger compartment.

If there is no electrical supply to the central locking system, the doors and trunk/tailgate can be locked and unlocked mechanically with the key or from the inside with the lock button and handle. The tank cover unlocked via the emergency release located under separate cover at the upper front section of the right hand luggage area panel. The central locking system also controls the alarm system if fitted. When fault tracing the alarm system please see the Anti-theft Alarm Section.


Central Locking Units

The central locking system features locks in the doors trunk/tailgate and tank cover. Components unique in the central locking system are:





Central lock motor.
Operating switch fitted in the trunk/tailgate and front door central lock units for activation of the central locking system via the key.
Switch for interior cabin lighting and courtesy lights.
Switch fitted in the front door central locking units for activation of the alarm system via the key.






Central Lock Motors






The central locking motors in the doors, trunk/tailgate and tank cover are coupled in series. These motors are activated by a brief 12 V pulse lasting 0.7 seconds, transmitted from the central locking relay. The central locking motor's two wires are grounded when the central locking motor is at standby, to prevent accidental activation.



Operating Switch, Central Lock






The operating switch is integrated into the central lock motors in the front doors and trunk/tailgate. The dual-position operating switch has a grounded in. coming signal wire and two outgoing wires which activate the central locking relay with agrounding signal for locking and unlocking respectively.

The position of the operating switch is altered mechanically by the central locking motor's control rod when locking and unlocking with the key, interior door handle or lock buttons, and electrically for activation by the central locking relay. The control rod acts on the operating switch when the latter is halfway through the rod's total operational sphere, when the door key has been turned about 40° in the lock.

When the operating switch position is altered, a ground signal is sent to the central locking relay which in turn activates all the central locking motors, which execute the locking or unlocking operation and shift the operating switches to the unlocked or locked positions respectively.


Switches For Interior, Courtesy Lights And Door-Warning Lights

The switches for the interior, courtesy and door-warning lights are 2-way microswitches located in the central lock units. They are affected by the position of the central lock unit's latch. The switches at the front door central lock units consist of double microswitches. When the door is open, both microswitches are connected to ground, one micro- switch controls the interior lighting while the other controls the courtesy and door-warning lights.





The rear door central lock unit uses the same micro- switch for the interior and door-warning lights. If either of the front doors is opened, the rear door door-warning lights are therefore switched on. When the door is opened or shut, control signals are sent from the interior light microswitch to the central locking relay, which regulates the function of the interior lighting. The switch at the trunk/tailgate central lock unit consists of a microswitch which only regulates the luggage area lighting and therefore does not send any signal to the central locking relay.

Trunk/Tailgate Lock Unit Signals Only Central Locking Relay:

The function of the central locking system is not affected by the switches for the interior, courtesy and door warning lights. The switches can be blocked to keep the interior, courtesy and door-warning lights off when the doors are opened by pushing the central lock unit's latch to the locked position with the help of a screwdriver.


Deadlock Switch

Deadlock Switch Located At Outer Cam Disc:

The deadlock switch consists of a 2-way microswitch which is only fitted in the two front door central lock units, located at the lock unit's outer cam disc. The deadlock switch is only activated when the door key is used to lock or unlock, and activates or deactivates the car's alarm system when the key is turned a further 20° in either direction by sending a ground signal to the central locking relay, which in turn sends a control signal to the alarm relay. The deadlock switch's wires are not connected to ground when it is in standby. The deadlock switch does not affect the central lock system's functions. For fault tracing of the alarm system, seeAnti-Theft Alarm Section.


Service Security Setting






The trunk/tailgate central lock unit, which can only be operated mechanically with the master and wallet keys, features a service security setting which bypasses the central locking system, preventing unauthorized access. In this service setting, the central lock motor is activated but its control rod is disconnected from the system's lock mechanism, so it cannot operate the lock mechanism. Locking in the service deadlock setting:

Turn the key about 90° anti-clockwise.
Pull out the key vertically.
Unlocking from the service deadlock position:
Turn the key about 120° clockwise a, the key will automatically revert to the vertical position 1 . Pull the key out vertically.


Central Locking Relay






The central locking relay is actually a control module consisting of a microprocessor, two relay coils for voltage supply to the central locking motors and a relay coil for voltage supply to the Interior lighting. The central locking relay receives the central lock unit control signals and activates the car's central locking system, interior lighting and alarm relay.

Central locking relay connections:
ATR 12 V pulsed input signal from receiver for remote-controlled central locking or optional alarm.
15 12 V input signal from ignition lock, key in position II.
30 Input voltage supply (30) from fuse box position 11/6:1.
31 Ground.
85A Grounded input signal from operating switch for driver's door when unlocking.
85B Grounded input signal from operating switch for front passenger door when unlocking.
85R Grounded input signal from operating switch for trunk/tailgate when unlocking.
86 Grounded input signal from operating switch in front doors and trunk/tailgate when locking.
87 12 V output signal to central locking motors for 0.7 seconds when locking.
88 12 V output signal to central locking motors for 0.8 seconds when unlocking.
AL1 Not used.
AL2 Output signal to alarm relay. 5 V constant output signal when the alarm is activated, and grounded constant output signal when the alarm is deactivated.
AT Grounded input signal from central lock units in front doors.
LA Grounded output signal to interior roof lighting.
T Grounded input signal from door switches for interior roof lighting.