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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 736 (Handles, Locks, Latches And Entry Systems) >> Diagnostic Tests >> Locks, Latches and Entry Systems >> Pinpoint Tests >> Pinpoint Test F: The Door Locks Operate Only One Way >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2007 Lincoln Mark LT and 2007 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.

The door lock control switches supply a ground signal to the vehicle security module (VSM). When the VSM receives ground through circuit 119 (PK/YE), the VSM grounds circuits 163 (RD/OG) and 118 (PK/OG), while energizing circuit 117 (PK/BK) to lock the doors. When the VSM reads ground at circuit 120 (PK/LG), the VSM grounds circuit 117 (PK/BK), while energizing circuits 163 (RD/OG) and 118 (PK/OG) to unlock the doors. The driver and passenger door lock control switch circuits are spliced together within the wiring harness.

DTC B1309 - is an on-demand DTC that sets if the VSM detects a short to ground on the driver door lock switch circuit 119 (PK/YE).

DTC B1341 - is an on-demand DTC that sets if the VSM detects a short to ground on the driver door unlock switch circuit 120 (PK/LG).

Possible Causes

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