Question about 2002 GMC Sierra

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Fog Lights won't work

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 Mar 23, 2014

    Fog light install

  • Anonymous Mar 25, 2014

    replace fog light switch

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  • 23 Answers

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!).

Posted on Dec 01, 2008

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SOURCE: fog lights on 2002 gmc

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

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

2 Answers

2002 Grand Am GT Headlights seem dim , fog lights dont work


Check at the headlight sockets for a bad ground.

Mar 02, 2009 | 2002 Pontiac Grand Am

5 Answers

98 Jeep Cherokee Fog lights


It's definitely the switch...I bought two of 'em so far...known bug. I don't use the fog lights as much anymore , but the "Airtex" oem equivalent switch from Rockauto seems to be holding up well. If you dissamble your broke switch you'll probably see evidence that it is beginning to melt and theres alot, maybe too much, grease, which may or may not have been the cause of the bad, heating contacts inside switch.
If I remember right, even though the foglights have a relay there is still full amperage going through the switch or something....don't qoute me on that last statement.

Jan 23, 2009 | 1998 Jeep Cherokee

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