Update 2010-08-28 10:24
Hello again. I am here with good news (but with an "asterisk" *)
As of this week I can report that , so far,
my electrical problem
" 06 Grand Cherokee - Electrical Problem with Dash Cluster" has been solved (*).
After many components being replaced and, with 20/20 hindsight, we now know that some of them were probably OK, but it was difficult to know at that time.
- Front Control Module
- Steering Control Module
- Shift Control Module
- Ignition Power Module
- Ignition Switch (2x)
- Fuse Block
The last effort by the "team" looking into this problem was the big one:
the wiring harness.
The team included:
Dodge/Chrysler/Jeep dealer (local) --- Service Director
Dodge/Chrysler/Jeep dealer (local) --- Senior Electrical Technician
Dodge/Chrysler/Jeep dealer (local) --- Service Adviser
Chrysler / Jeep (Detroit corporate) --- Customer Service Representative
Chrysler / Jeep (Detroit corporate) --- 5 star Engineering Support
and lastly... --- myself
After all the above components being replaced and the same initial electrical problem still there, it was obvious (to me anyway) that we never found the source of the original problem. All the previous repair efforts have to be credited to a best educated guess.
So, the last attempt at repair was to replace two (2) wiring harnesses: one forward of the firewall and the other in the cabin.
NOTE: it took considerable effort to persuade the Jeep Corporation to replace these components. Many phone calls were made and a lot of coordination and frankly many hours of normal business day working hours were needed to accomplish this. Many thanks to my company for being so tolerant of this saga as we called it. Some things just can’t be accomplished nights and weekends.
So… the two harnesses were replaced and now after a few days, (queue the heavenly chorus) and so far, no problems are occurring
. Though, the final verdict is not in yet, it seems to be fixed. I told the dealership service department, that I will be closely monitoring this and it is not over till, quite frankly, many months of good performance.
Bottom line today: FIXED BUT NOT CASE CLOSED
An observation just after repair is that I think my Jeep GC is running better and smoother than when I purchased it from the Jeep dealer (used with 29k). I am now over 80k and the last few days I feel that the Jeep is running so much better and that I am now thinking that this electrical problem was there from date of purchase and just took a little time to reveal itself. If the problem was there at the beginning it makes me wonder whether the original owner noticed the irregularities and just maybe wanted to trade it in. Mechanical problems are one thing but electrical problems are and can be a nightmare.
If anyone out there is having similar electrical problems and it is pointing at "this module" or "that module", and they are replaced and the problem still occurs... then go straight to the wiring harness, albeit not an inexpensive way, but it may just solve the problem(s).
* the asterisk represents the fact that this final fix was an expensive one and probably not easily achieved by one with less training than a factory trained technician.