The dash switch only do lock but wont unlock the doors.
Mercedes vito sliding door lock problems.
Try all the way i could find from the.
Red black green and white.
You will need to connect red and green wires door locks perfectly and open door light in dash is not illuminated.
If so replace the fuse.
The physical lock unlock buttons work ok from inside.
The driver side sliding door and rear door wont lock or unlock by central lock.
If just one lock won t open on your mercedes then the problem may rest with broken wiring a bad solenoid or perhaps with a blown fuse.
Push you see it catch push more you see it close a little further.
Check your fuse box first to determine if a blown fuse is keeping the lock from working.
My 2006 merc vito has 4 wires into the rear door locking mechanism.
When locking the door the indicator wont flash as it should be but do 1 flash when unlocking as normal.
The electrics will not be connected until the door closes properly as the contacts are on the same end of the door that does not engage the lock hook correctly.
Lite on the dash switch wont turn on anymore.
Initially tested by putting wire across terminals and figured out that green and red turned the open door light off in the dash.
My vito had some central locking problem and fixed.
You can try this with a screw driver shaft into the the receiver the u clasp engages with.
Be sure to unlock before you close the door again.
So sometimes it will not unlock remotely more importantly sometimes it will not lock remotely so i need to manually lock it inside first.
Left hand side id normal.