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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSMERCURY1998MOUNTAINEER 5.0 P, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 21 (DEFOGGER - REAR WINDOW)COMPONENT TESTINGREAR DEFOGGER SWITCH
1998 Mercury Mountaineer 5.0 P, AWD
Rear Defogger Switch
1998 Mercury Mountaineer 5.0 P, AWDSECTION Rear Defogger Switch
WARNING: This page is about a different car, the 1997 Mercury Mountaineer and 1997 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
- Unplug rear defogger switch. Connect switch terminal No. 4 (Black wire on mating connector) to ground. Apply battery voltage to terminal No. 6 (Dark Green/Purple wire on mating connector). Defogger indicator light should come on.
- Apply battery voltage to switch terminal No. 5 (Red/Black wire on mating connector). Switch illumination light should come on.
- Disconnect jumper wires from switch. Depress and hold switch button while checking for continuity between switch terminals No. 3 (Dark Blue/Orange wire on mating connector) and No. 4 (Black wire on mating connector). Continuity should exist. Continuity should not exist with switch released (OFF position). If operation is not as specified, replace switch.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.