Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMERCURY2006GRAND MARQUIS V8-4.6L VIN WREPAIR AND DIAGNOSISBODY AND FRAMEBODY CONTROL SYSTEMSTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSLIGHTING CONTROL MODULE (LCM)PINPOINT TESTS
2006 Mercury Grand Marquis V8-4.6L VIN W
Pinpoint Tests
2006 Mercury Grand Marquis V8-4.6L VIN WSECTION Pinpoint Tests
PINPOINT TEST C: NO COMMUNICATION WITH THE LIGHTING CONTROL MODULE (LCM)
Normal Operation
The headlamps with autolamps, turn signal lamps/hazard flasher lamps, cornering lamps, parking lamps, courtesy lamps, demand lamps, battery saver and backlighting are controlled by the LCM. Voltage is supplied through the central junction box (CJB) on circuit 221 (OG/WH). The LCM is grounded through circuit 676 (PK/OG).
Possible Causes
- fuse
- circuit 221 (OG/WH) open or short to ground
- circuit 676 (PK/OG) open
- LCM
C1-C2:
C2 Continued:
Normal Operation
The headlamps with autolamps, turn signal lamps/hazard flasher lamps, cornering lamps, parking lamps, courtesy lamps, demand lamps, battery saver and backlighting are controlled by the LCM. Voltage is supplied through the central junction box (CJB) on circuit 221 (OG/WH). The LCM is grounded through circuit 676 (PK/OG).
Possible Causes
- fuse
- circuit 221 (OG/WH) open or short to ground
- circuit 676 (PK/OG) open
- LCM
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.