It is down to the micro switch which is integral to the boot lock. The boot lock also is connected to the main door control module. I have a similar problem on my 8L Audi S3, which is based on a Golf MK4.
I had it were non of the doors would lock You had to open the drivers door lock the doors on the button on the door Then shut the drivers door and lock it with the key If you tried it with the fob or key only the drivers door worked lol And were the drivers door wouldn't open Had to thump the door next to the lock while locking and unlocking till the drivers door opened At this point the drivers lock module was changed for a good secondhand one That fixed it
Also noticed the boot lock over shoots by a few mm on my 4motion So it won't unlock just miss the catch It don't always do it but most of the time if you need in
you have 2s switches for the mk4 boot, theres one in the boot catch itself which tells the CCM module when the boot is open, plus it turns on the boot light. the 2nd switch is in the lock, which tells the CCM module if the boot lock is in the locked or unlocked position. plus theres the boot lock actuator as well, which coudl be faulty. have you checked the ccm module with vagcom to see if its got any codes flagged? also if you scan thru the measuring blocks you can see the status of all the lock modules, windows, boot and bonnet switches etc. its possible the ccm module is faulty also
Ta so folks. Sorry to take so long to reply, but I have been trying to get my head around the wiring diagrams! Before I start to strip the rear panels out and trouble shoot I wondered what the voltage state should be to solenoids/microswitches. Does the CCM allow a constant voltage to the operating solenoids, or just long enough to operate the unit 'til the switch changes state? I ask this because if the voltage is constant it will be easier to trouble shoot.
the ccm module doesn't care about the signals from either of the switches when triggering the solenoid, it'll open/close it regardless of the switch positions (I haven't yet wired either of mine in!) I'll check if the solenoid gets a constant 12v or if its pulsed later if I remember, also need to try and dig out some battery boxes for you!
Thas a reet good 'un, son! Regarding the limit switches. Just realised that the CCM does not need to know about limit switches as it knows the the state of the system from the last key-switch signal it received. i.e. LOCKED OR UNLOCKED. Battery disconnect would perhaps be the only time it did not know the state? I was thinking back to the control systems on the machines I designed. Power was switched off at the end of a work cycle so we had to have a limit switch at each end of travel so the PLC could look at their signal to check the state when power was returned.
I spent some time yesterday looking through quite a few SSPs. Two of note: SSP 193 = AUDI 'Komfort' System. It looks similar to the MK4 system. Trouble is the things in German!!!! SSP 204 = ESP. Wish I had not read this one! The amount of electronics: accelerometers (lateral and yaw), switches, sensors, controls, control modules, etc., is SCAREY! So much to go wrong that can/t be checked without Scan Tools etc.
Ta so Eddie, but I was at the dealer's yesterday and they are going to help me at no charge. YES. FREE!
Wonder if there's gonna be a self study guide for a VW self driving car They promise it by 2020 https://tranio.com/world/spotlight/...ss-cars-will-change-the-property-market_5354/ might need to do our homework in advance
