A costly mistake, please help!

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Originally Posted by Graeme

The suspension fault and subsequent lowering is likely to be the result of the hand-brake message/fault because that is what the suspension system does for any brake system generated fault.

What year model D3 is it? On early vehicles the TC module connected to the high speed canbus but on later vehicles the high speed canbus was input to then output from the TC ecu which would mean that a dead TC module would cause a lot of other ecus including the park brake ecu to be unable to communicate.

Did you manage to clean-up the sockets in the connectors?

Are there any other connectors nearby that could be corroded by the battery acid? To change ranges the TC module has to know that the gbox is in neutral so bad connections at the gbox connector could be a cause.

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Its a 2006 HSE. There is a plug directly under the battery that looked like it got something when this problem first occurred but when disconnecting the terminals are very clean.

The handbrake doesn't beep until after I have put the gbox into P, but what you are saying about the Low Range makes sense as well.

Does anybody know what the plug is that sits under the battery and just in front of the transfer case module? It has one of those grey bits that you have to pull out to disconnect and push in to connect.

I have heard that there is a transmission module, where is that one?

Is this battery on the RHS in front of the brake m/c? The TC module on the D4 is there as well as the connector for the gbox harness but I don't know the D3. The transmisison module is inside the gbox.

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Originally Posted by Graeme

Is this battery on the RHS in front of the brake m/c? The TC module on the D4 is there as well as the connector for the gbox harness but I don't know the D3. The transmisison module is inside the gbox.

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This is the cranking battery on the LHS of the vehicle, perhaps the harness thats under the battery is the gearbox one on the D3 as well, that would probably explain a lot! Can anybody confirm?

Could water have gotten into any other connector and it still be wet?

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Originally Posted by Graeme

Could water have gotten into any other connector and it still be wet?

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x 2

If there are 2 canbus wire pairs for the TC module then the handbrake ecu and the suspension ecu will be cut-off from the rest of the network if the TC module is dead, according to the high speed canbus network diagram. Canbus wires are quite thin and each pair has a slow twist. Removing the TC module if there are 2 canbus pairs should not alter the existing faults if the TC module has failed.

I have conflicting information for the 2007 model, with the wiring diagram for the TC module showing only 1 canbus yet the comms network diagram showing 2. I suspect the change was made for the 2007 MY with some documentation not updated but perhaps the change was made earlier.

MY07 changed the way modules 'talked' to each other. Stopped cascade faults which caused the D3 to lower to bump stops an chuck it's toys out of the pram.

I was aware of the e-diff ecu canbus connection change but hadn't even looked into the TC's connection to the rest.

Whilst the vehicle is a 2006 model, is it a 2006-built MY07?

Is there anything to be gained by testing the crook / suspect module in another ( same MY ) car?

Or is there a risk of creating problems in the good car, that stay after it's original module is reinstated?
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Quote:

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Originally Posted by Graeme

I was aware of the e-diff ecu canbus connection change but hadn't even looked into the TC's connection to the rest.

Whilst the vehicle is a 2006 model, is it a 2006-built MY07?

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I am unsure what MYyear it is at the moment, next time I'm out having a look at it I'll have a look. How do I find what MY year it is??