75ZT Community

Artic thinks Duncan is the man in the know for this.

I have an early Facelift Tourer and a late Facelift tourer.
It could be T4 (Testbook version 4.Computer Diagnostic System) programming.

Late Tourer, 1 short click, only drivers door unlocks, second click, all doors and tail gate unlock. 1 long click and drivers door and tail gate unlock.


Early Tourer 1 short click, only drivers door unlocks, second click, all doors but not tail gate unlocks. 1 long click drivers door and tailgate unlock.

Is the early tourer faulty or is it T4?


The button in the centre console will not work, could this have been T4 disabled or a fault?


Could my two issues be connected by something not T4


thanks
Dirk Pitt

OK.
I hadn't come across a long press on a tourer doing that. There's a setting than can be changed by T4 between drivers door, or all doors unlocking on a single short press. I've never seen anything else the T4 can change directly.

Regarding the none working internal button. There have been a few times where the wrong centre console harness had been fitted. Earlier cars had a rocker switch (one side unlock, the other lock). To save money it was replaced with a push switch. Push to lock, push again to unlock. This requires one wire less, and if the harness with one wire is fitted, and the switch is a rocker, it does odd things. So, what type of switch is in your early car? It's also possible that someone swapped out the switch, or even the console, and they don't match.

If have seen odd behaviour, where the BCU (Body Control Unit) has been changed. The one that foxed me for ages, was a very early BCU had been fitted to a facelift tourer. I double and triple checked the coding was right, but it still behaved wrong. Figured out the car was behaving as if it were a saloon, even though coded as a tourer. Problem was the very early BCU didn't know what a tourer was, som completely ignored that coding.

There was a change on the saloons, as the boot release switch in the lower A pillar got deleted. At that point I know a long press on the unlock, would pop the boot open, so maybe the behaviour on the tourer changed, too?

Hi Duncan.
Big thankyou for answering the question, which originally was asked over on the OC, which i suggested the owner ask here as he might get an answer, it seemed similar to the car which we were talking about at the Nano albeit that was a saloon and the owner was oening the door with the key, but now uses the fob with one click opening all the doors as opposed to one click for the drivers door, second click for the reat of the doors, and he had the 5mph lock taken off.

Hi Duncan,
sorry for not replying sooner, I thought I had clicked to get an email notification for a reply but no email received. Thank you for the reply.
I would describe the switch as a rocker, the same as in my later car, 2004 and 2006 cars. There are 2 black wires and two wires of other colours that go to the rocker switch. I was told :-
Remove the black 6 way connector from the switch.
Using a jump lead, bridge pin 4 (black wire) to pin 1 (grey/pink). Do the doors lock?
Bridge pin 4 (black wire) to pin 6 (grey/green). Do the doors unlock?
The bridging should be done for about one second only to mimic the operation of the rocker switch.


Having done the above test I got
1 and 4 locks, and, 1 and 4 unlocks
4 and 6 do nothing.
I assume 4 and 5 and connected together somewhere, as 5 is also Black.


What I am getting in the way of activation, does seem to match what you are saying. Could I get the BCU, Body Control Unit, reprogrammed to tell the BCU it is fitted to a Tourer? I could leave things as they are but I think the tailgate not opening with the second click is going to get on my nerves.

Dirk Pitt

Hi.
The switches look the same, but aren't. When I say rocker, if you push the ends, it rocks one was or the other. If you push in the centre it won't move. The push switch, the whole thing moves down, wherever you press. The rocker is on earlier cars, the push on later. My 2004 early facelift has a push switch for example. EDIT: the change happened at chassi number 3D288163
Sounds like you have the wiring in the car for the rocker. But it sounds like you have it coded for the push switch. If that's the case, then one side of the rocker switch will both lock and unlock. The other side will do nothing, just as you found when bridging 4-1.
According to the circuit diagrams, pin 5 should be red/white for switch illumination. Pin 4 is the ground for the switch and illumination.

It is possible to reprogram the BCU yes. The first thing, though would be to properly understand what the coding is now, and go from there.

Thanks Duncan. Between you and others on another forum I am learning but I can read something time and time again and not understand and then suddenly, bingo.
I never noticed the switch in the car and the spare I fitted were rocker and single push. I would attach a picture but cant see how to do it.
Last night I thought it all sorted in respect of the switch and locking and unlocking but this morning no. I have a rocker switch now fitted, this is one with the electrical plugs are in the middle and as you say, from the top, they look the same. Whilst a rocker switch will lock and unlock the car, it seems to depend what locking and unlocking, has been done by the fob. If memory serves me right, if drivers door only has been unlocked by the fob, the centre console switch will unlock the other doors and relock the doors. If the fob has unlocked all the doors, the centre console switch does nothing.

I dont have access to a T4 but have downloaded TOAF, I have ordered a lead and will very carefully see if I can see anything. As for changing settings
mmmm may be not but perhaps I can at least compare them to my 2006 Tourer

thanks for all the help

Dirk Pitt