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If this vehicle came prewired, and all you had to do was plug in the fog lamps, then 50A fuse 7 in the power distribution center would be hot at all times, applying power to 15A fuse 24 and the fog lamp relay. Setting the left multifunction switch to FOG causes the body control module to close the fog lamp relay and turn on the fog lamps. It is possible your Jeep came prewired but without the fuses and relay so a dealer could install them to make your fog lamps work. You can check whether the fuses are in the box and OK and whether the fog lamp is installed or just an empty socket. Once everything has been checked and any missing parts installed, your fog lights should work.
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.
You need to check the bulbs.These are known to go out a lot.Also you can check that you have power to the lights with a test light.Sounds like a bulb or wiring problem.I have had a few of these that are broken off because they are so close to the ground.Depending on if your four wheeling or in snow country.Hope this helps.Good luck.
Fog lamps are installed on the front bumper. The switch is located
to the left of the steering column on the dash panel. The fog lamps are
turned off by the circuit relay when the high beam driving lamps are
turned on. The circuit relay is located on the right front wheelhouse
panel near the blower motor.
Good luck, and remember rated this help.
Removal & InstallationFog Lamp Element See Figure 1
Fig. 1: Exploded view of a fog lamp assembly
Remove the lamp stone shields, the four bezel attaching screws, and the bezel.
Remove the reflector assembly from the lamp body.
Remove the bulb holder from the assembly. Remove the element from the bulb.
DO NOT handle elements with your bare hands, always handle with a
clean cloth. Oil from your hands will cause the element to fail.
Installation is the reverse of removal.
Fog Lamp Switch The fog lamp switch is removed and
installed by simply prying the switch from the instrument panel and
unplugging the electrical connector.
FOGLAMP BEAM ADJUSTMENT
Position the vehicle on a level surface, facing a wall
approximately 25 feet away. Remove the lamp stone shields and loosen
the adjustment nuts.
Turn the fog lamps ON and adjust as follows:
Distance between the light beam centers should be equal to the distance between the lamp assemblies on the bumper.
Height of the light beams on the wall should be 4 inches less than the center of the lamp assemblies when mounted on the bumper.
Install all previously removed items after turning OFF the fog lamps.
No.. power is supplied to both bulbs in parallell... when power is present at one, it's also present at the other. Clarification needed - have you checked to see if you have power (battery voltage) and ground at the fog lamp connectors?.. if so, the problem is the bulb(s) it/them/self/selves. If you have an ohm meter or a test light, it's a simple procedure. Check the bulbs with an ohm meter. Then using a test light (12 volt, make sure the test light bulb is good by connecting it to a charges 12 v battery) connect the test light bulb to each of the fog lamp connectors with the fog lamp sw turned on and the ignition key in the 'run' position. If the test light illuminates at both fog lamp connectors, then the problem is in the fog lamp bulb(s) themselves. If not, there's a wiring/control circuit problem. You can go to http://www.hmaservice.com/ and register and gain access to lots and lots of technical info about your Sonata.
hi from uk the fog lghts? i assume front fog lamps ? the head lights have to be on dipped beam then the fogs will also work but in uk this is so as to prevent fogs only being used (blinding oncoming traffic ) if weather conditions req fogs to be used for poor visibility ? then the side/tail and h/lights must also be on like wise the rear fog light/s operate the same way hope this helps and makes perfect sense ?? all above is assuming bulbs have been checked and fuse/relay and power to each lamp ?