The BMW E30 were first introduced in October of 1982 as a model to replace the E21 chassis. The E30s offered aerodynamic advantages over the E21. The grill was now less radical and angular and the spotlights were embedded in it. There were two variants, known as pre-reestiling until 1989, and post-reestling until end of production.

The 1988 BMW E30 325i Central Locking System is controlled by the Central Locking Control Unit. This unit senses when a lock switch is moved by a key, and sends the appropriate signal to drive the Motors. The Central Locking Control Unit controls the Door Locks, Gas Filler Lock and Trunk Lock. The unit also has an Inertia Switch which closes on impact greater then 5g. If in RUN or START the locks are then unlocked.

The following schematic diagram depicts the 1988 BMW 325i E30 Central Locking Wiring System and Circuit.

1988 BMW 325i E30 Central Locking Wiring System and Circuit Diagram

1988 BMW 325i E30 Central Locking Wiring System and Circuit Diagram

Locks

When the Key is inserted into a lock and turned clockwise, the Lock switch moves to LOCK and grounds termonal 7 of the Central Locking Control Unit. The unit then activates the Lock Relay and applies voltage from Fuse 27 to the Lock Motor, which is grounded through the Central Locking Control Unit terminal 2. The Lock Motor then pulls the lock down. The door locks also control the Trunk Lock and Gas Filler Lock.

Unlock

When the key is turned counterclockwise, terminal 6 of the Central Locking Control is grounded throught the Lock Switch. The Central Locking Control Unit then activates the Unlock Relay and applies voltage from Fuse 27, through terminal 2 to the Lock Motor. The motor is grounded through the Central Locking Control Unit terminal 1. The polarity is reversed and the motor pushes the lock up.



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