Central Locking System, 2-Step

General

The central locking system can be used to lock and unlock all doors and the trunk/tailgate simultaneously. What is unique about the 2-STEP central locking system is that when you unlock the front door locks with the key, the door lock concerned opens purely mechanically. If you 'unlock' the door once more within 10 seconds, all the doors open, plus the trunk in 4-door models and the tailgate in 5-door models.

There is a central locking button on the dashboard for locking and unlocking the central locking system from inside. The central locking system is controlled by a central locking relay and a driver's door relay located in the passenger compartment fuse panel. The central locking system also controls the interior lighting. When you first unlock the car using the key. remote control or central locking switch, the interior lighting comes on.

The light stays on for 30 seconds or until the ignition is switched on. If there is a central locking system power failure, the doors and trunk/tailgate can be locked and unlocked mechanically using the key or the interior locking button and door locks. The fuel filler cap can be opened using the emergency lever located under a separate cover in the top front section of the right hand luggage compartment panel. The central locking system also controls the alarm system (basic alarm) if the car is fitted with this. When fault-tracing in the alarm system, see Anti-Theft Alarm Section.

NOTE: If you open the trunk on 4-door models or tailgate on 5-door models using the key, the side doors will not unlock.


Central Locking Modules

The central locking system has central locking modules located in the:
doors.





trunk/tailgate.





fuel filler cap.





Components unique to the central locking modules are:
central locking motor.
control switches installed in the front door central locking modules for controlling the central locking system by key and activating/deactivating the basic alarm.
The control switch in the trunk/tailgate controls activating/deactivating the basic alarm by the key only.
passenger compartment lighting and interior lighting switch.
The rear doors (including the tailgate in 5-door models) are fitted with child safety locks. With the child safety lock on, a door cannot be opened from inside.

Central Locking Motors






One side of the driver's door central locking motor is connected to the drive's door relay. This gives a short 12 volt pulse for approximately 0.6 seconds to the driver's door central locking motor when the UNLOCK button on the remote control is pressed or the central locking switch is used. (This is because the central locking relay gives a grounding control signal to the driver's door relay.) This relay is also activated by 'other unlocking' using the keys in the front doors.

The central locking motors in the other doors, trunk/tailgate and fuel filler cap are connected in parallel and activated by 'other unlocking' or when unlocking via the central locking switch. All central locking motors are activated by a short 12 Volt pulse for approximately 0.6 seconds which the central locking relay transmits when the doors are locked. The two wires on the central locking motor are grounded when the central locking motor is in standby mode to prevent them being activated accidentally.

The link arms on the central locking door motors are mechanically disengaged from the motors via a centrifugal clutch. Operating the link arm does not trip the motor. This does not apply to the trunk/tailgate or fuel filler cap, where the link arm is mechanically connected to the motor.

Central Locking System Control Switch






The control switch is integral with the locking module in both front doors. The control switch is of the 3-way monostable type (resting position in center only) and has a grounded incoming signal lead and two outgoing leads which control the central locking relay via a grounding signal for locking and unlocking respectively.

Deadlock Switch Located At Outer Cam Disc:

The position of the control switch is controlled exclusively by the door key when locking or unlocking. The trunk locking unit (4-door models) and tailgate locking unit (5-door models) has a 2-way alternating control switch which only controls the basic alarm via the central locking relay when activating and deactivating. The control switch emits a grounding signal in the unlocked position.


Passenger Compartment, Interior Lighting And Door Warning Light Switch







The switches for the passenger compartment and interior lights and door warning light are 2-way microswitches located in the central locking module and controlled by the position of the central locking module locking disks. The front door central locking module switch consists of a double microswitch. When the door is open, both microswitches are grounded: one microswitch controls the passenger compartment lighting and the other the interior lighting and door warning lights.

The rear door central locking modules have a common microswitch which controls both the passenger compartment and door warning lights. If either front door is opened, the rear door warning lights will come on. When the door is opened or closed, the microswitch sends signals to control the passenger compartment lighting to the central locking relay which controls the passenger compartment lighting. The switch on the trunk central locking module (4-door modules) is a microswitch which controls the trunk lighting only and does not therefore send any signals to the central locking relay.

Trunk/Tailgate Lock Unit Signals Only Central Locking Relay:

The central locking system is not affected by the door switches for the passenger compartment or interior lighting or door warning light switches.
The door switches can be immobilized so that the passenger compartment ,interior and door warning lights do not activate when the doors are open by pushing the central locking module locking disk into the locked position using a screwdriver.


Service/Security Position







The trunk/tailgate central locking module, which can only be operated mechanically with the master and wallet keys, is fitted with a service/security position which takes the central locking module out of the control of the central locking system. The service/security setting activates the central locking motor, but the central locking motor control rod is disengaged from the central locking module locking mechanism so it does not activate the locking mechanism.

Locking in service/security setting:
Turn key approximately 90 ° anti-clockwise.
Remove key horizontally.

Unlocking service/security setting:
Turn key approximately 120 ° clockwise (1), the key will return to the vertical position automatically (2)
Remove key vertically.


Control Module (Central Locking Relay And Driver's Door Relay)

The central locking relay is actually a control module consisting of a microprocessor, two relay coils supplying power to the central locking motors and a transistor for the grounding signal to the interior lighting. The central locking relay receives control signals from the central locking modules and activates the car's central locking system, driver's door relay, interior lighting and alarm relay.


NOTE: If you activate the central locking relay more than 30 times in quick succession, the relay will lock to prevent itself and the central locking motors overheating.





The central locking relay is located in the central relay module in position 205/206. The central locking relay has a backup in the form of a conventional (two-way) type driver's door relay in the central relay module in position 202.