Probable CANbus fault 2.0 CDTI Tourer

[KSM62]

Hi all, I've had the, no rev counter, temp gauge, rear demister fault, intermittently for the last couple of years, but a few weeks ago they all failed again and have not come back to life since. As per advice here on the forum, I have checked for damage and done some continuity testing to the wiring under the front nearside wing and couldn't find any problems. So I have booked in a T4 diagnostic this week to see if there is a problem with the CANbus. If, as is likely, the CANbus is faulty, what are my options. Its a NNN100692. Showing as out of stock on Rimmers site but eye wateringley expensive. Probably nearly as much as the car is worth I'm assuming that the Ex Rover tech, who is doing the diagnostics, would also be able to programme another unit if required.

[Jamiewelch]

Might be worth seeing if someone near you has an ECU kit (ECU, EWS and transponder) to fit to the car just to see if the error disappears. If it does then you know where the issue most likely lies. If it doesn't then the issue is elsewhere on the car. I wouldn't recommend using an ECU kit for more than testing to be honest, it would get the car running though.

If the ECU is fried then MarinaBrian is the guy to speak to about repair / replacement, he can do it through the post too.

[thanos.m]

If I'm not mistaken the rear defrost in on the K-Bus and from what I know the K-bus and canbus meet at the IPK so it could potentially be an ipk failing or an ecu If It does turn out to be canbus or k-bus issue and you cant find a replacement section for the 75 you may as well look at BMW for one the E46 3 series and a few others used the same system finally I'll advise to find a shop with an oscilloscope so they can check the cunbus signals for anomalies

[David Lawrence]

Do you have a fuel burning heater fitted? If so, try unplugging it.

Mine has the K line cut, but if the loose end flaps around I got some strange things like you describe going on. Might be worth checking the wiring to it to see if anything appears exposed and possibly shorting somewhere

[marinabrian]

Nope it's can messages failure instrument pack 3.

The CANBUS controller is NLA for the NNN100692, and as you point out Rimmer Bros is out of stock of these units.

I have one or two NNN100692SR units on the shelf, and if you would like a plug and play replacement for your defective unit, I can definitely assist or indeed a virgin unit to be coded to the car with T4......and not at Rimmer Bros prices either, as you will be cutting out two middlemen

Drop me a PM if you need to know more.

Brian

[markypicks]

if iwas you i would take brians offer p north east. there is also bigg russ up west yorkshire both do a postal service and a quick turnaround rgds mark