Question about 2002 Ford F150 Regular Cab

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Map lights 2002 Ford F 150 Supercrew FX4. Map lights quit working. Checked interior light relay, and battery saver relay as well as the fuse all are working and in order. Also the glove box light and the engine compartment light which are acccording to the hayes manual on the same circuit are still working. checked for power at the fixture, no power to the map lights. Both rear map lights work when doors are opened but do not work independently. HELP!!!!

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Just wondering if you ever found a solution to this problem. I have a similarly equipped 01 SuperCrew and the Map lights do not work independently. All come on when the door is opened and all work via dome light switch on dash, but none will come on when I try to switch them independantly. Everything else works fine. I suspect a bad relay, but all relays are the same part number and I have swapped places with no change in results.

Posted on Jan 08, 2011

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Where is the interior light relay on 2001 ford windstar


Your interior lights are controlled by the GEM - generic electronic module !
Battery Saver The battery saver relay is controlled by the generic electronic module (GEM) and is located in the fuse junction panel. The battery saver relay is designed to supply B+ voltage to the following:
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PINPOINT TEST AF: COURTESY LAMPS ON CONTINUOUSLY AF1 PRELIMINARY CHECKS
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  • Check for loose or damaged wires.
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Is resistance 5 ohms or less? Yes No SERVICE Circuit 434 (LB/BK) for short to ground. RESTORE vehicle. RETEST system. REPLACE interior lamp relay. RESTORE vehicle. RETEST system. Interior lamp relay is located in the Instrument panel fuse box .
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This is for the engine compartment and illuminated vanity lamps, as well as the map lights.

The FET ( Field-Effect Transistor ) shows the fuse #9 also on it. ( marked interior lighting ), which power the interior lamps ( door / switch ).

Could be a few things if both those fuses are OK.

1. The map / interior lamp combos are usually dual element bulbs, which means if the interior lamps ( door or dimer switch on headlamp panel ) are OK, it could still be a burn out bulb.

2. The FET is having an issue from a dead short ( blown bulb or dead short to ground ). Until the short is correct, the FET will not turn back on.

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4 Answers

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