1998 Jeep Cherokee Could it be the PCU? Many electrical pro

Tiny
GZILLANTE
  • MEMBER
  • 1998 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 151,000 MILES
Hello. I have been having many electrical problems happening with my Jeep recently. They seem to be intermittant and extremely annoying.

-Intermittant air bag light (already replaced harness to gauge cluster and made sure connections are good)

-Window switches work intermittantly on passenger controls, electric mirror controls don't work

- Heat/fan blower shuts off on it's own and then comes back on no matter what the setting is on

- Fan blower for heat/ac stayed on for 5 minutes after shutting off the vehicle AND REMOVING THE KEY, and was still controllable with fan speed selector! (This one took the cake of my confusion)

I actually removed the bulb that shows the airbag warning because it was too annoying to me. I have had my dash apart on so many different occasions trying to find any problems with the way the gauge cluster was sitting. I also replaced the faulty wire harness that causes the gauges to spontaneously drop up and down and that issue is fixed. I had a mechanic friend check the warning codes and there was nothing that said that there was a disconnected cluster. I am contemplating purchasing a remanufactured PCU to see if that has anything to do with my problems, unless you have any other ideas or have heard these symptoms before. I love this jeep and would hate to ever get rid of it. I have always taken good care of it and just want everything to work as it should. Thank you for your time.
Saturday, October 9th, 2010 AT 12:50 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,643 POSTS
Honestly, I have three thoughts in mind. They are the body control module, a bad body ground, or the ignition switch. The fact that the blower motor ran like that tells me it was still getting power which should only happen when the key is in the on position.

Have you checked those things?
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Saturday, October 9th, 2010 AT 11:50 PM
Tiny
GZILLANTE
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  • 2 POSTS
That reminds me that I have ahd an issue with the ignition switch a few years ago where I was actually at the gas station, went to turn the truck on and wouldn't crank, electricity was on, but no engine crank. I have some time today, is there any specific way I should test the ignition switch? I'll check the BCM and ground wiring.
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Sunday, October 10th, 2010 AT 8:40 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,643 POSTS
It actually needs removed and checked to see if there is continunity in different settings.
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Sunday, October 10th, 2010 AT 11:59 AM

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