Question about 1997 Jeep Grand Cherokee

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What causes a fog light switch not to work?

Would a bad fuse cause the fog light switch not to work (the amber light doesn't come on and it won't turn on or off the fog lights, also would a fuse cause the window lock not to operate correctly?

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  • 53 Answers

Yes it will it will be blowen fuse

Posted on Jul 29, 2009

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Posted on Jan 02, 2017

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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

5 Answers

Fog lights stay on when light switch is turned off


I just fixed this problem on my wife's PT. It was the switch on the column. Her car has the fog light switch as part of the head light / turn signal switch. The lights stayed on after turning off the ignition and the lights.
You will most likely have to replace the switch.
Unless you are lucky and a skilled mechanic / electrician you may be able to open up and fix the switch like I just did.

Apr 30, 2009 | 2001 Chrysler PT Cruiser

1 Answer

Fog lights not coming on when turn switch


It is possibly the light switch that is faulty but before you change this make sure you check all fuses and relative relays

Apr 23, 2009 | 2000 Ford Focus

1 Answer

Fog lamps


a bad relay is your most likely cause.  It's inside the fuse box.

Mar 06, 2009 | 1994 Ford Mustang

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

1 Answer

Lights


FROM: Lusty Kid:

Your fog lights should not work with high beam... they should work with the low beams. they are connected wrong, which probably drew too much current through the light switch burning out the contact points for the parking lights in the switch

Start by Fixing the fog light connections to work with low beams. Appears to me this was not factory installed. Aftermarket kit maybe! Then see if your parking lights work. If parking lights don't work still and everything else works, replace the light switch $50 at the dealer. The switch works the fog lamps when you pull out the knob to turn on the fog lamps when the lights are turned on. When the fogs are on you will see a little amber light to let you know your fogs are on. When you switch to high beam the fog lamps go off. Again if its not working that way, then is wired wrong. Needless to say, there should be connectors in the harness of the lights for the fog lamps. Use those if possible with the kit that you can get at the dealer, or you can splice the connector with those blue splicing clips sold at the auto part store. Make sure ground is ground when splicing and water proof the connection sith silicone and tape.

Dec 13, 2008 | 2004 Ford F150

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