Normal Operation

The door lock control switches provide a ground, circuit 57 (BK) for the vehicle security module (VSM) lock and unlock signal circuits 119 (PK/YE) and 120 (PK/LG). The door lock actuator output circuits 117 (PK/BK), 118 (PK/OG) and 163 (RD/OG) are at ground on circuit 57 (BK) through the VSM when the lock and unlock relays are not energized.

When the VSM receives a lock request through circuit 119 (PK/YE), the VSM processes the lock request and energizes the all lock relay, supplying voltage to circuit 117 (PK/BK) to lock the doors. Circuits 118 (PK/OG) and 163 (RD/OG) are at ground on circuit 57 (BK) through the VSM.

When the VSM receives an unlock request through circuit 120 (PK/LG), the VSM processes the unlock request and energizes the all unlock relay and driver unlock relay supplying voltage to circuits 118 (PK/OG) and 163 (RD/OG) to unlock the doors. Circuit 117 (PK/BK) is at ground on circuit 57 (BK) through the VSM.

The side and rear cargo doors equipped with the E-Guard Cargo Protection^TM , will only unlock with the key from outside of the vehicle. All doors will lock with a command from a remote keyless entry (RKE) transmitter or door lock control switch, but only the front doors will unlock from an RKE or door lock control switch command.

This pinpoint test is intended to diagnose the following:

• Wiring, terminals or connectors
• Door lock control switch
• VSM