AC/heater control
06-11-2011, 10:28 AM
#1
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Location: Western Michigan
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Year: 1993
Model: Grand Cherokee
Engine: 4.0l inline 6
AC/heater control
93 Grand Cherokee, I-6 4.oL
I got my grand 2 weeks ago and have been trying to fix things that the PO didnt get to before he sold it to me. The AC/Heater control (auto temp) panel isnt working (no power). And I seem to be missing the Vehicle information center (VIC). On the back of the AC/ Heater control panel I have a empty plug hole. I was wondering, does the VIC have a cable/wire that plugs into this control panel? I'm at work and dont have my FSM or wiring diagram with me. I haven't had the chance to get out my meter and start traceing wires, and I dont have a VIC to compare anything to so I was just wondering. Any ideas?
I got my grand 2 weeks ago and have been trying to fix things that the PO didnt get to before he sold it to me. The AC/Heater control (auto temp) panel isnt working (no power). And I seem to be missing the Vehicle information center (VIC). On the back of the AC/ Heater control panel I have a empty plug hole. I was wondering, does the VIC have a cable/wire that plugs into this control panel? I'm at work and dont have my FSM or wiring diagram with me. I haven't had the chance to get out my meter and start traceing wires, and I dont have a VIC to compare anything to so I was just wondering. Any ideas?
11-05-2011, 08:36 AM
#3
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Join Date: May 2010
Location: Western Michigan
Posts: 1,680
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Year: 1993
Model: Grand Cherokee
Engine: 4.0l inline 6
on going heater saga;
Since the weather has started getting colder the heater issue has moved it self to the forefront. I had thought I checked all the basic things but some peeps suggested I check the fuses. If I checked them then I must have had my eyes closed. The 7.5 fuse that runs the heater was blown. I replaced it and now I have power to the heater control panel ( hmmmmm, go figure). I ran the self check and here is what I got;
(Fault code - description - problem area)
01 - circuit open - ambient temp sensor
02 - circuit open - in-vehicle temp sensor
03 - circuit open - solar sensor input circuit
04 - circuit open - front panel blower/fan control input
05 - circuit open - front panel mode control input
06 - circuit open - blend air door feed back circuit
07 - circuit open - mode door feedback circuit
16 - feedback to low - blower/fan feedback circuit
26 - coolant temp message missing - collision detection c2d bus inputs
27 - vehicle speed message missing - collision detection c2d bus inputs
28 - engine RPM message missing - collision detection c2d bus inputs
I took the blower motor resistor out, mainly to have a look, found that the cavity that it sits in was full of tree debris (really weird) and that the heat sink (the finned metal piece that the resistor sits against) had a small burn mark on it. Put it back together and no heat. The blower doesn't kick on and I get no heat. The heater control display shows an error and when I do the self-check I get the same fault codes.
Question is;
Where do I go from here and what should I check?
Since the weather has started getting colder the heater issue has moved it self to the forefront. I had thought I checked all the basic things but some peeps suggested I check the fuses. If I checked them then I must have had my eyes closed. The 7.5 fuse that runs the heater was blown. I replaced it and now I have power to the heater control panel ( hmmmmm, go figure). I ran the self check and here is what I got;
(Fault code - description - problem area)
01 - circuit open - ambient temp sensor
02 - circuit open - in-vehicle temp sensor
03 - circuit open - solar sensor input circuit
04 - circuit open - front panel blower/fan control input
05 - circuit open - front panel mode control input
06 - circuit open - blend air door feed back circuit
07 - circuit open - mode door feedback circuit
16 - feedback to low - blower/fan feedback circuit
26 - coolant temp message missing - collision detection c2d bus inputs
27 - vehicle speed message missing - collision detection c2d bus inputs
28 - engine RPM message missing - collision detection c2d bus inputs
I took the blower motor resistor out, mainly to have a look, found that the cavity that it sits in was full of tree debris (really weird) and that the heat sink (the finned metal piece that the resistor sits against) had a small burn mark on it. Put it back together and no heat. The blower doesn't kick on and I get no heat. The heater control display shows an error and when I do the self-check I get the same fault codes.
Question is;
Where do I go from here and what should I check?
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