Central locking of my 2004 W639 vito only working on front doors and only unlocks on tailgate. Fuses ok (under seat). Have been checking the connector to the position switch (the connector plates on the sliding door frame (see photo) and I get no power there (blue and red wire I presume). Do the wires come from the fuse box directly or is there anywhere else I can test the power supply? The sliding doors don't have a control unit. The tailgate is difficult to test with the multimetre but I seem to get some reading on the blue and red wire and it does at least unlock remotely. Everything opens and closes manually. I just think there is an electrical problem somewhere and I'd like to find it before I spend money on replacing the door locks. I'd appreciate some advice!
No power to sliding door position switch vito w639 2004
- Thread starter Kathvito
- Start date
m80
MB Enthusiast
- Joined
- Apr 26, 2015
- Messages
- 6,743
- Location
- Derbyshire, High Peak
- Car
- Viano ex long, 651 2014. S211 646 2009 (till the Gov't drones blow 'em off the road)
If you manually lock all 3 rear doors, do they unlock on the fob?
I have taken off the tailgate lock and the little solenoid only unlocks with fob. I could replace the solenoid or the whole lock but I am not sure that this is the answer to the door open beep. I have used the Haynes Autofix wiring diagrams and it tells me to "Measure the resistance between pin 4 (in boot lid lock unit) and A 20 (E6 Power supply control unit). Is it less than 1 Ω?". I presume this is the ecu in the fuse box?? A20 doesn't seem to be a used connection, A19 and pin 3 gave me a resistance reading but nothing on A20. Any ideas??
m80
MB Enthusiast
- Joined
- Apr 26, 2015
- Messages
- 6,743
- Location
- Derbyshire, High Peak
- Car
- Viano ex long, 651 2014. S211 646 2009 (till the Gov't drones blow 'em off the road)
m80
MB Enthusiast
- Joined
- Apr 26, 2015
- Messages
- 6,743
- Location
- Derbyshire, High Peak
- Car
- Viano ex long, 651 2014. S211 646 2009 (till the Gov't drones blow 'em off the road)
No, the door is fed via the pins and pads on the B pillar.
There is a motor and controller within the rear trim. That's a fair bit o work to remove.
There are pulse signals through to solenoids within the door.
There are micro switches that send open / closed signals to the SAM.
The micro switches are a known failure on these.
I don't know what your E6 relates to.
Some research here and you should find some DIY cct diagrams that may help.
There is a motor and controller within the rear trim. That's a fair bit o work to remove.
There are pulse signals through to solenoids within the door.
There are micro switches that send open / closed signals to the SAM.
The micro switches are a known failure on these.
I don't know what your E6 relates to.
Some research here and you should find some DIY cct diagrams that may help.
