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Unread 08-25-2013, 02:47 PM   #1
Rockeater
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1998 ZJ 
 
Join Date: Jul 2013
Location: Superior, Arizona
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No Gauge Cluster, No Radio - Bad BCM?

In the past, my gauge cluster lights would flicker. Now my gauge cluster and radio have died at the same time. The only light within the gauge cluster that works is my ABS warning light (always on since the day I bought my Jeep). All my fuses are okay (IOD okay). When I remove the front connection (14 pins) to my Body Control Module (BCM), nothing changes (i.e. vehicle driving remains the same). When front connection is connected to BCM, most flow with 12v, except Pin 6, 8, 13, & 14. Pin 1(11.2v), Pin 2(10.9v), Pin 3(11.2v), Pin 4(11.2v), pin 5(no wire), Pin 6(0.5v), Pin 7(no wire), Pin 8(0.0v), Pin 9(11.2v), Pin 10(11.2v), Pin 11(no wire), Pin 12(no wire), Pin 13(0.0v), Pin 14(0.0v).
Either my BCM or wiring to BCM is faulty. How do I check to see if my wiring to my BCM is faulty? In this normal current from or to my BCM?
Grand Jeep Cherokee Limited ZJ. 5.9L, V8


Last edited by Rockeater; 08-25-2013 at 05:43 PM.. Reason: More information.
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Unread 08-25-2013, 06:24 PM   #2
ZeeJay1997
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There's an orange wire from the BCM this is the panel lamp driver for the radio and instrument panel. it splices a couple of times and has the other panel lamps on the circuit also.

So your warning, cruise, cel, etc do not do a bulb check when the switch is turned on?
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Unread 08-25-2013, 09:26 PM   #3
Rockeater
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ZeeJay1997,
I presume I check this orange cable from my BCM with a voltmeter, and check it carries a current (voltage)?
If so, does this indicate I have a faulty BCM?
If not, indicate the orange cable needs attention?
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Unread 08-25-2013, 09:54 PM   #4
ZeeJay1997
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check out the panel lamp drive outputs. the diagrams explain it better than i can. if the output is not there, you're going to missing other lamps too. it may be a splice or a bad cluster.
iclamp2.jpg

iclamps.jpg

radio1.jpg

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Unread 09-11-2013, 08:29 AM   #5
Rockeater
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Well the issue was not resolved and things have gotten worse.
Several days ago I turned the key (ignition) and nothing happened, all interior lights dead. A minute later with key in the ignition, the interior lights came on and I was able to started the jeep.
The problem seemed to disappear, until yesterday.
Now all interior lights, all headlights and all electrical power cables under my dashboard are dead. My battery is good and power is delivered to most electrical components under the hood.
Do you think this a Power Control Module (PCM) problem?
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Unread 09-11-2013, 03:36 PM   #6
ZeeJay1997
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Quote:
Originally Posted by Rockeater View Post
Do you think this a Power Control Module (PCM) problem?
The PCM will have no effect on the body components like lights, radio, etc.

What you are describing sounds like a battery cable or connection.
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Unread 09-12-2013, 12:34 AM   #7
Speedymcracer01
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Quote:
Originally Posted by ZeeJay1997 View Post

The PCM will have no effect on the body components like lights, radio, etc.

What you are describing sounds like a battery cable or connection.
Yep i agree i would check power supply connections from the battery to the pdc and also the power supply for the inside fuse box as well
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Unread 09-14-2013, 09:59 AM   #8
Rockeater
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ZeeJay 1997 & Speedymcracer01

Today I will attempt your suggestions.
Thanks for your help.
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Unread 09-14-2013, 12:47 PM   #9
Rockeater
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ZeeJay 1997 & Speedymcracer01

As per your suggestions, I did check my power supply connections.
One of the negative cables was corroded, and warm to the touch after several times of failed starts.
While attempting to start, the headlights would die.
After a dose of baking soda, cutting away small section of corrosion of negative battery cable and reconnecting;
My jeep started up first time.
Again, thanks.

However my gauge-cluster and radio (died same time) are still not working.
mmmm, some things I may have to live with.
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Unread 09-14-2013, 01:33 PM   #10
ZeeJay1997
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Quote:
Originally Posted by Rockeater View Post
ZeeJay 1997 & Speedymcracer01

However my gauge-cluster and radio (died same time) are still not working.
probably something loose under the dash. i think fuses 6 and/or 7 in the inside fusebox supply the power
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Unread 09-14-2013, 01:56 PM   #11
ZeeJay1997
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Quote:
Originally Posted by Rockeater View Post
ZeeJay 1997 & Speedymcracer01

However my gauge-cluster and radio (died same time) are still not working.
probably something loose under the dash. i think fuses 6 and/or 7 in the inside fusebox supply the power
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Unread 09-15-2013, 08:12 PM   #12
Rockeater
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I have checked all my fuses, all are closed and good - problem not solved.
I did remove the gauge cluster and check the power supply to it. I used a 12v light tester.
I notice all 10 wires leading the the gauge cluster, except one, have no power.
I presume the one wire that is receiving power is the one illuminating the ABS light, which is always illuminated when ignition is on.
How do I locate and check to see if the PCI Bus is transmitting power (information?) to the gauge cluster?
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Unread 09-15-2013, 09:21 PM   #13
newfieZJ
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Quote:
Originally Posted by Rockeater View Post
I have checked all my fuses, all are closed and good - problem not solved.
I did remove the gauge cluster and check the power supply to it. I used a 12v light tester.
I notice all 10 wires leading the the gauge cluster, except one, have no power.
I presume the one wire that is receiving power is the one illuminating the ABS light, which is always illuminated when ignition is on.
How do I locate and check to see if the PCI Bus is transmitting power (information?) to the gauge cluster?
Since there are 2 fuse boxes , some might consider the PDC under the hood a fuse box . I need clarification . The fuse for these is fuse 7 located on the pass side kick panel fuse box . I know personally , this will cause your symptoms . Also test for power at that source .

The ABS would be powered from a different source .
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Unread 09-15-2013, 09:29 PM   #14
newfieZJ
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You might as well read up on this too for the next fix . It's quite simple . http://www.jeepforum.com/forum/f13/r...-heavy-702703/
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Unread 11-12-2013, 10:27 AM   #15
Rockeater
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It works now

I got some advice from Muzramp.
Although it was not the fuse, it was connection to fuse #7.
Attached are photos of repair.
kickpanel-fuse-box-2.jpg   kickpanel-fuse-box-3b.jpg  
kickpanel-fuse-box.jpg

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