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Fog lights on 2002 gmc sierra won,t work. Bulbs are good, relay and switch seem fine and fuse is good. I got them to come on when I put a test light on the negative switch post on the relay//// Help

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  • Anonymous Aug 15, 2008

    It was never programmed on the computer chip. When I brought my vehicle in and complained they re-programmed the chip, now it works.

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GET A TESTER. LOOKS LIKE A SCREW DRIVER BUT HAS A LIGHT AND GATOR CLIP. AND TEST THE SOCKET.

Posted on Oct 29, 2009

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2005 gmc sierra rt side low beam and fog lights not working


use dc voltage meter and see if you have power in the sockets and if the fuse is good and relay , also check to make sure you haven't lost the ground.

Feb 08, 2013 | 1998 GMC Sierra

1 Answer

My fog lights won't turn on Nissan sentra GEX 2002


There are several things that can cause your fog lamps to not work. The fog lamp circuits need to be diagnosed. Your entire fog lamp circuit can be tested at the plug for the fog lamp relay located n the relay box.

PIN 5 on the relay should have battery power at all times. This power comes from Fuse #43 (15 Amp) in the fuse and fusible link box in the engine compartment. If there is power at this pin, the fuse and the circuit between the fuse and the relay is good.

PIN 3 on the relay goes to the fog lamp bulbs. There should be continuity to ground through the bulbs on this pin. If you have continuity to ground, connecting a jumper wire between PIN 5 and PIN 3 should make the fog lamps come on unless there is a short circuit to ground, which will cause Fuse #43 to blow. If there is no continuity to ground on this pin, the problem is either that BOTH fog lamp bulbs are burned out or there is a break in the wire between the relay and the bulbs.

PIN 1 Is the battery power for the primary coil in the relay. This power comes from the headlamp switch and power is only supposed to be present here when the headlamps are on and the dimmer switch is on LOW BEAM. If power is not present at this pin, the problem is a bad headlamp switch or an open circuit between the headlamp switch and the relay.

PIN 2 Is the control circuit for the primary relay coil. The control circuit should have continuity to ground when the fog lamp switch is set to the ON position. If there is no continuity to ground with the fog lamp switch on, the problem is a faulty fog lamp switch, an open between the relay and the fog lamp switch, or an open between the fog lamp switch and ground E37 (right front of engine compartment) and ground F7 (left rear of engine compartment) Please note: This circuit has redundant grounds....if one ground is not making good contact, the other ground can still make the circuit work.

PIN 4 on the relay is not used.

If all of the circuits/pins are working as described above, replace the relay.

That is pretty much it... That is all you really need to know to get your fog lamp circuits diagnosed. Let me know if you need further assistance.

May 13, 2012 | 2002 Nissan Sentra

2 Answers

My fog lights won't work but switch shows power, however when hit the switch can hear the relay on passenger side fuse box can hear it click does that need replaced


Hi, if the light on the switch is coming on, the relay is fine. Unless both bulbs are burned out, the problem is in the wiring between the relay and the lights. I recommend you trace the wiring backward from the passenger side fog light to the power box under the hood to see if the wire is cut. There should be two wires coming out of the power box--one going to each fog light. If the wiring looks good, it is also possible that the ground to the lights is bad.

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Aug 29, 2011 | 2000 Oldsmobile Alero

3 Answers

Brake lights won't come on after changing brake booster on 97 gmc 1500. Also won't shift into gear.


check for a bad brake light fuse! if not the fuse, the brake light switch operates brake lights and if bad you will not be able to shift it out of park, as well as the brake lights not coming on.! because you have to put foot on brake to do so. if bad switch, it wont let it out of park. it could be just out of adjustment also!! good-day !

Aug 28, 2011 | 1997 GMC Sierra

2 Answers

My 2002 gmc Sierra's low beams will not work but my drl high beams and fogs work fine....


check your headlamp switch.is your switch on the dash or part of the turn signal switch.gm have a thing with plastic switches and metal contacts these switchs have a tendency to melt..also check for grounds.was the vehicle in a accident involving the front end.if you changed your headlamps to 80/100 watts bulbs.the circuit breaker may not work hence the switch melts.

Jun 23, 2010 | Cars & Trucks

1 Answer

I have a 2002 GMC sierra 1500. Instrument Lights Not Working


When dash lights don't work odds are the tail lights don't work either.Sounds like Dimmer switch may be a problem.

Oct 02, 2009 | 2002 GMC Sierra 1500

1 Answer

2002 GMC SIerra Parking lIghts


Get a test light and see if there is power in the sockets. If not then check the circuit fuse, switch, wiring etc.

Jun 22, 2009 | 2002 GMC Sierra

1 Answer

Front fog lights not working


if the fuse on the driver side panel is good,and the relay under the dash is good then check your connections or your bulbs

Jun 01, 2009 | 2002 Volvo S60

1 Answer

Fog lights not turning on


Sounds good to me except, the switch light shout be on the relay primary circiut and light off until you turn it on. When you turn the switch on, it lights up and energizes the relay, the relay closes and completes the secondary circiut for ythe fog lights. VIOLA' I have a silverado. done deal thanks

May 28, 2009 | 2003 GMC Sierra

1 Answer

Fog Lights won't work


Definitely a ground. Clean everything with light sandpaper. Follow any/all wires and see where it grounds, clean there too. If all else fails, run a new ground wire from the frame to the exact spot you got the bulbs to work (a workaround that usually remains permanent on my cars!).

Aug 07, 2008 | 2002 GMC Sierra

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