Disco 1 300tdi mfu problems

Hi all

I have a P reg 300tdi with all the symptoms of mfu problems. Interior lights, wipers, fog lights etc.

My question is though, how do I find out which mfu I need? Ive seen ones with different numbers on and I'm not convinced that the one that was in there is even the right one. I put a different one (black with a different number from an N reg) in just to see the effects and the fog lights come on when I open the rear door, the wipers sort of work better, heated rear screen now makes a relay click but the light on the switch doesn't work/come on. Interior lights still don't come on.

A previous owner has bypassed/disconnected the immobiliser, and there's all sorts of stuff happening with the dash immobiliser light.

If I can start by getting the right mfu I'll be able to rule it out at least.

Any ideas?

There only two types, early is black, later is cream, so it appears you have a 96MY or later disco requiring the cream item.

That's about the best reply I could hope for. Cheers!

Damn this comes up and it makes me wonder if I have the same fault or even the car car!! Had my immobilizer removed as well by the looks of it for whatever reason. Main annoyance being the interior map light and wipers being faulty

Don't guess, test. The Multi Function Unit has a diagnostic facility, just Googles to find, most D1 forums have the details posted, I expect details are in the LR D1 workshop manual also. Simples




Sent from my iPad Air on a train.

discool said:

Don't guess, test. The Multi Function Unit has a diagnostic facility, just Googles to find, most D1 forums have the details posted, I expect details are in the LR D1 workshop manual also. Simples

Click to expand...

+1 - test procedure is fiddly but doable