For 1990-2009 cars

When you activate a front door lock switch in the LOCK or the UNLOCK position, all of the doors lock or unlock in unison. You can also operate each lock manually from the locking knob. The automatic door locks are operated by reversible motors that receive voltage and ground from the automatic door lock relay. The automatic door lock feature is controlled by the multi-function alarm module. If the automatic door locks are activated with a door open, the doors will not lock until that door is closed.

### Doors Lock (Automatic Transaxle)

With the ignition switch in RUN and the gear selector moved from the PARK or NEUTRAL position, the multi-function alarm module receives a ground signal through CKT 1786. When the ground signal is received, power is supplied to the door lock relay through CKT 195. This locks the doors. If the vehicle reaches 13 km/h (8 mph) without receiving the ground signal via CKT 1786, the multi-function alarm module will supply power to CKT 195. This occurs once per ignition cycle.

### Doors Lock (Manual Transaxle)

The multi-function alarm module reads the vehicle speed through CKT 817. With the ignition switch in RUN and the vehicle exceeding 13 km/h (8 mph), the multi-function alarm module provides power to the door lock relay through CKT 195. This locks the doors. This occurs once per ignition cycle.

### Doors Unlock

The multi-function alarm module unlocks all of the doors when the module detects that the ignition has been turned off. This signal comes through CKT 39 (the ALARM fuse). The multi-function alarm module then supplies battery voltage through CKT 194 to the door lock relay which in turn unlocks the doors. The DR UNLK fuse was designed as a disable feature for the automatic door unlock feature. If the DR UNLK fuse is removed, the automatic unlock feature will not operate.