Inspection and Verification

Visually inspect for obvious signs of mechanical and electrical damage.

VISUAL INSPECTION CHART

MECHANICAL AND ELECTRICAL CHART

Mechanical	Electrical
Brake pedal position (BPP) switch Multifunction switch (Grand Marquis only)	Central junction box (CJB) fuse 22 (15A) Circuitry Loose or corroded connections Stoplamp bulb(s)

If the concern remains after the inspection, connect the diagnostic tool to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:
1. Check that the program card is correctly installed.
2. Check the connections to the vehicle.
3. Check the ignition switch position.
If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool manual.
Carry out the DATA LINK DIAGNOSTIC TEST. IF the diagnostic tool responds with:
1. CKT914, CKT915 or CKT 70 = ALL ECUS NO RESP/NOT EQUIP, refer to MODULE COMMUNICATIONS NETWORK .
2. NO RESP/NOT EQUIP for the driver door module (DDM), refer to MODULE COMMUNICATIONS NETWORK .
3. SYSTEM PASSED, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out self-test diagnostics for the DDM.
If the DTCs retrieved are related to the concern, go to the DDM DIAGNOSTIC TROUBLE CODE (DTC) INDEX .
If no DTCs related to the concern are retrieved, proceed to the Symptom Chart .