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Old 09-22-2016, 04:20 PM
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Question 02 Overland Electrical issue help please

Short & long of it.. bought a 2002 Jeep Grand Cherokee Overland 4.7L HO 4 yrs ago (My 98 Durango finally bit the dust). 334,000 KM. The blower fan started cutting out intermittantly, went to the wreckers got an identical Control Module from another 2002 JGC Overland with the connector that was pristine, (When I took mine out, the 3 prong connector was literally fused to the CM) & the blend door actuator (mine was making weird noises after shutting off). Connected the CM & the blower motor with butt joints, checked continuity with an OHM meter, installed the actuator, turned on the ignition, moved the AZC dial to Auto, turned off ignition, removed fuse # 15 (IOD) for 2 minutes, put it back in, turned on Jeep for two minutes to re-calibrate the blend doors. Now I have NO 12v power to the installed CM or actuator or blow motor, none. Checked fuses #7 & #20 under the dash, and fuses # 1 (40A) and #15(50A) under the hood, all good. If I move the right control, the lights on the control panel light up, can change temp settings to HI or LO, I can hear doors moving in the dash, but it is not the blend doors (change settings defrost, mid-dash, floor & everything in between). The left control for fan speed does nothing. Totally at a loss here, any & all help is appreciated.

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  #2  
Old 09-23-2016, 12:22 AM
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Re: 02 Overland Electrical issue help please

The melting of the connector on the blower motor controller is a well known problem. Its caused by bad contact/resistance and subsequent heating of the connector and melting of the plastic.
Are you sure that you connected the wires correctly?
Regarding weird noises after switching ignition off, it depends what you where hearing. It is normal that the system will move the blend doors some minutes after ignition off. You will hear the blend door actuators running and at the end of the travel you will hear a different noise when it hits the end stop.
Did you try the self diagnostic test to see if any fault(s) are stored? Press AC and recirc button at the same time and turn the left temp control knob clock wise one click. A segment test will start and now you can release the AC and recirc buttons. If a 0 is shown, then no faults are stored. If faults are stored, then they will be shown one after the other, until you turn the left temp control knob one click counter clock wise.
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Old 09-23-2016, 06:35 AM
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Re: 02 Overland Electrical issue help please

Thank you for the quick reply. The actuator plastic connector (the white part)that connects to the blend doors was broken on 2 edges, making the actuator continuously run after the blend doors were closed (hence the strange noise). All wires butt connected red - red, black - black, and the resistance wire, blower motor red - red, black - black. Not getting any voltage to the new setup. Is there a resistor or inline fuse between the fan speed knob on the dash and the control module under the glove box? Ran the diags & got errors 52,53, & 54 but I think those are from previous as I have no power to the new setup.
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Old 09-23-2016, 08:31 AM
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Re: 02 Overland Electrical issue help please

The codes 01 up to 32 are current faults, 33 to 64 are historical faults. I would first try a battery disconnect for some minutes, maybe the module is frozen and needs to be reset. The historical faults will be reset as well at that time.
I would also re-check the wiring. I would not thrust too much that same colors are the same connection. There are stories known of (after market) connectors for the blower control module, where the wires are crossed.
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Old 09-23-2016, 07:26 PM
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Re: 02 Overland Electrical issue help please

Thanks Frango, going to re-check the voltage going to the CM connections tomorrow, it is not an aftermarket kit, it came out of another 2002 Overland, unit is identical to mine. Tested my CM tonight, did an ohm check on the 'what looked like burned prong' and it was fine. The original actuator for the blend doors that was cracked on the connector tube, I epoxied and clamped and re-installed. Do you know how to remove the blower controller panel in the dash above the ashtray so I can test the blower control switch? Can find nothing on youtube for that. Any help appreciated.
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Old 09-23-2016, 09:42 PM
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Re: 02 Overland Electrical issue help please

A very good reference for the WJ you can find under WJJeeps.com - Jeep Grand Cherokee WJ 1999-2004
See here the description on how to remove the AC control panel: Jeep Grand Cherokee WJ - lamps and lighting - bulb removal
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Old 09-24-2016, 01:37 PM
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Re: 02 Overland Electrical issue help please

After checking all fuses again, still no voltage to the control module. Went back out to the wreckers and plucked the control panel from the center of the dash. Plugged it in and now have motor blower again! Fellow at the wreckers said the 5 volt sensor shorts out and will not turn on the 12 volt to the control module, hence no power to the module or blower. Thanks for the help Frango!
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