Normal Operation

WARNING: This page is about a different car, the 2009 Mercury Milan, 2009 Lincoln MKZ, and 2009 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

When the key is inserted into the ignition cylinder, the key-in-ignition warning switch (part of the ignition switch) closes providing voltage on circuit CDC30 (BU/GY) to the instrument cluster (IC). The voltage input signals the instrument cluster (IC) that the key is inserted. Door ajar status is communicated to the instrument cluster (IC) from the smart junction box (SJB) through the controller area network (CAN). If the instrument cluster (IC) detects that the ignition lock cylinder is in the OFF or ACC position, the key is inserted in the ignition cylinder, and the SJB communicates to the instrument cluster (IC) that the driver door is ajar, the key-in-ignition warning chime sounds.

DTC B1352 (Ignition Key-In Circuit Failure) - is a continuous DTC that sets in the instrument cluster (IC) if the instrument cluster (IC) does not sense voltage applied on circuit CDC30 (BU/GY) with voltage applied to circuit CBP23 (BN/YE) or CBP20 (YE/VT).

This pinpoint test is intended to diagnose the following:

Wiring, terminals or connectors
Key-in-ignition warning switch (part of the ignition switch)
Instrument cluster (IC)