Re: Replacing BCM on Grand Cherokee 2.7 CRD Ltd
I'm not sure which of my several problems you are referring back to, but here goes: -
1) What I thought was a failing BCM, which resulted in the EVIC tripping out, together with loss of window controllers, remote locking and several other features, was not, directly, down to the BCM at all.
In the end I had to bite the bullet and let the local Jeep main dealer hook it up to their diagnostic gear. (£120 + VAT). They diagnosed a faulty PCB in the gear lever assembly, mine is a 5 speed auto, and verified it by fitting a spare assembly, which had a different fault, that they had in the workshop. As is fairly typical these days, it was not a case of dismantling the gear lever assembly and fitting a new PCB. It was a case of supply and fit a new gear lever assembly at £670 + VAT. Altogether the best part of Grand!
There is a not very good 'work-around' for the above failure which is, with ignition OFF, to open bonnet and lid of the PDC (Power Distribution Centre) on left side of engine bay, and remove the IOD (Ignition Off Draw) fuse (Cavity 15) for, say, 30 seconds then replace it. All systems will then function enabling you to close windows and remote lock the car. Next time you use the vehicle the system will drop out again. I filed a little groove in the plastic case of the IOD fuse to facilitate the fitting of a small tie-wrap around it to make removal easy.
2) You do however, mention it being cold in your neck of the woods, so I'm hoping that your problem is the, considerably cheaper to repair, broken blend door(s). The original plastic blend doors are prone to break near their hinges with consequent loss of heater control. Jeep themselves are aware that it was a poor design and their replacements are made in aluminium. You can't, of course, buy replacement doors individually, it's the whole kit or nothing. There is, however, a cheaper (also ali) repair kit available from Mansfield 4 x 4 Ltd. "www.mansfield4x4.co.uk". When I purchased this kit in Nov '12 it cost £77 + VAT.
I have attached a 'pdf' of the fitting instructions and recommend the use of a small (2mm), short, dremel to cut out the partitions. Do not go to the main dealers to get this done, it will cost an arm and a leg. The approved "Jeep" method is to attack it from the front, removing the AirCon evaporator unit with consequent labour and re-charging of the aircon costs.
Hope this diatribe helps.