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  #13  
Old 12-17-2013, 05:16 PM
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Re: Replacing BCM on Grand Cherokee 2.7 CRD Ltd

Hi Tony

I know that it's almost been a year since your first post but I was wondering if you ever cured the problem, as I now have exactly the same faults.

I have trolled the web and can only find your post and it is to the word the same issues that I have.

I have a 2.7 CRD JGC Overland 2003 RHD

Your help would be greatly accepted as I have no heat and It is pretty cold outside (North Wales).

Regards

Gavo
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Old 12-18-2013, 06:24 AM
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Re: Replacing BCM on Grand Cherokee 2.7 CRD Ltd

Hi Gavo,

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.

Cheers

Tony N
Attached Files
File Type: pdf JGC Heater Blend Door Installation Instructions.pdf (575.1 KB, 1 views)
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Old 12-18-2013, 06:11 PM
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Re: Replacing BCM on Grand Cherokee 2.7 CRD Ltd

Tony

Thank for your response, listed are the problems that I experiencing at the moment.

Interior lights inop on door opening
Electric windows inop
Steering wheel controls (radio volume, seek buttons) inop
No heat from heater
Temp not showing just compass
On board computer not changing from U.S to M
AC automatically comes on
Alarm not sounding on 3rd press
When on main beam no blue light on dash
Engine management light comes on and goes into limp mode (intermittently)
There could be more but yet to have come across them.

When I remove a 10amp fuse from the top row I think #7 it clears all faults and I get everything back again.

I also have these fault codes coming on with intermittent engine management light coming on and going into limp mode

Fault codes

0235 turbocharger boost a circuit malfunction
2125 ACC Pedal position sensor 2 signal voltage to high or low
0340 camshaft position sensor circuit malfunction
0700 transmission control system malfunction
1685 invalid key received from smart key immobiliser module

When I do a key dance the light goes off and all is normal again.

I have read forum after forums and still struggling to understand what is what (and I'm not the brightest spark in the battery but I know a little).

The blend door issue I am aware of and I will sort that once I get my head around these issues which I can only assume is an electrical fault of some sort?

I appreciate your help and really hope I haven't brought a dog!

Gavin
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Old 12-19-2013, 04:28 AM
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Re: Replacing BCM on Grand Cherokee 2.7 CRD Ltd

Hello again Gavin,

I'm very much afraid that it sounds as though you're not going to get to the bottom of this without it being hooked up to the Jeep test gear. The problems you are having sound very similar to mine, although I would hesitate to say the cause is the same.

As I understand it, all the data to and from the BCM travels on a single PCI bus line, so any part of the system going down could affect it.

I had all the symptoms you listed except that I never experienced the "limp mode".

You might find a smaller garage than a main dealer that has a Bosch tester. When my ABS light came on and stayed on, a local auto-electrician correctly diagnosed it as being the front left sensor, although when I went to him with the original BCM problem he said he couldn't cope with that. I would suggest scouring your local area for an auto-electrician, the most likely place to find such a tester. You may be luckier than I was.

Be interested to hear how you get on.

Cheers

Tony N
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