Hello to all. I have this unique problem with the left side fog lamp on my 2008 Nitro. After replacing the lamp, it flickered 4-5 times and then nothing while the right hand side works perfectly. I have tested the bulb, and it is not blown. I then fitted a new bulb, but nothing. Took out my digital volt meter and test the voltage while the fog lamp switch is in on position. It registered at 11.84V. Then I removed the terminals from the housing, thinking that is had some corrosion on them and cleaned it. Put every thing back and tested the bulb, nothing. Take a voltage test with the bulb fitted to the socket and found it to be 2.3V. My question is the following: Does the fog lamps supply come from a CAN Bus module or not, and does the this module test for over current and open circuit? If so, where is it hidden?

 

You fog lamps are powered through the TIPM (fuse box in engine) and are on two different circuits. You should have 2 fuses, one for each. Check the fuses first, you may have a bad one for the left. Based on the schematic I'm looking at (08 Nitro 4.0L 4WD) hot comes in all times, to the TIPM, then on two seprate wires, goes to each fog light individually on two seperate grounds.

I'd check the VD on the right side and compare it to the VD you got on the left side. Also check source voltage on the right, the same as you did on the left. If everything checks out then it'd be the fuse, if not, then possibly bad resistance in the wiring. Based on your VD output and nothing else being on the schematic, that bulb should have 12V as the VD. Def sounds like a corrosion at the ground maybe or something. I'll see if I can post the schematic I have...Let me know if you're using a different engine/sub-model, transmission, and/or AWD orRWD

 

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