Question about 2008 Jeep Wrangler

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My jeep wrangler 2008 has no parking lights everthing else works, i changed th light switch but that was not it , at the fuse box there is no voltage in the both fuses that belong to the parking lights

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Welcome to the world of modern technology, where the vehicle manufacturers are having a race to see who can do the best job of keeping a vehicle owner from diagnosing something as simple as a light circuit! In an attempt to FORCE them into the dealership repair shops. Please check out this web site: Right To Repair

Okay - Here's how the manufacturer has succeeded in deterring any DIY attempt to repair your park lamp circuits:

The light switch does not actually switch the lights on or off. The light switch is actually a small computer that sends a digital signal to the Body Control Module (BCM) to tell it that you are "requesting" that the lights be turned on.
The BCM (if it decides to comply) then sends a digital signal to the Totally Integrated Power Module (TIPM) This is the thing under the hood that most people would call a "fuse box", however, it also contains a small computer. Fuses M17 and M18 in the TIPM are what provide power (protect the circuits) for your park lamps (both are 15 Amp fuses). I am assuming that these are the fuses that you checked. Please note that these fuses are "switched". They only have power when the power is turned on by the TIPM, and this only happens when the BCM tells the TIPM to do so.

If you are checking the fuses with the ignition switch in the RUN position and the headlamp switch in the PARK or HEADLAMP position and there is no power at these fuses, you will have to use a scanner that can read the data from the BCM to find out why.

If your headlamps are working, I would say that he problem is not a data communications problem between the headlamp switch and the BCM or between the BCM and the TIPM. It will most likely end with replacement of the TIPM, but then, the data really needs to be checked before replacing ANYTHING.

Posted on May 25, 2011

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