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 MANUALSLINCOLN2008NAVIGATOR 4WD V8-5.4LREPAIR AND DIAGNOSISBODY AND FRAMEMIRRORSTESTING AND INSPECTIONPINPOINT TESTSTEST F: THE HEATED EXTERIOR MIRROR IS INOPERATIVE
2008 Lincoln Navigator 4WD V8-5.4L
Test F: The Heated Exterior Mirror Is Inoperative
2008 Lincoln Navigator 4WD V8-5.4LSECTION Test F: The Heated Exterior Mirror Is Inoperative
PINPOINT TEST F: THE HEATED EXTERIOR MIRROR IS INOPERATIVE
Normal Operation
When the engine is running and the heated rear window switch is pressed, the electronic automatic temperature control (EATC) or the electronic manual temperature control (EMTC) grounds circuit CHI22 (WH/OG) and the heated rear window relay closes. When the heated rear window relay is closed, power is supplied to circuit CRD06 (BN/YE) to battery junction box (BJB) fuse 23 (15A). The heated exterior mirrors receive power from circuit CBB23 (BN/YE), through BJB fuse 23 (15A). Ground is supplied to the LH heated exterior mirror through circuit GD143 (BK/VT) and to the RH heated exterior mirror through circuit GD138 (BK/WH).
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Exterior mirror glass
- Exterior mirror
Normal Operation
When the engine is running and the heated rear window switch is pressed, the electronic automatic temperature control (EATC) or the electronic manual temperature control (EMTC) grounds circuit CHI22 (WH/OG) and the heated rear window relay closes. When the heated rear window relay is closed, power is supplied to circuit CRD06 (BN/YE) to battery junction box (BJB) fuse 23 (15A). The heated exterior mirrors receive power from circuit CBB23 (BN/YE), through BJB fuse 23 (15A). Ground is supplied to the LH heated exterior mirror through circuit GD143 (BK/VT) and to the RH heated exterior mirror through circuit GD138 (BK/WH).
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Exterior mirror glass
- Exterior mirror
F1-F4:
F4-F6:
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.