Wife just brought this to my attention, the tailgate while latching, will not lock. We'll use the fob to lock the doors, no problem, but the tailgate, you can just open. The alarm sounds, but it's unlocked?
We did have a problem with the rear passenger lock solenoid, which I haven't replaced as we don't use that door. Basically, it doesn't work. You can manually lock/unlock the door, but not electronically.
Any ideas on the tailgate? Am I missing something?
Should have asked if the internal Door Lock (the switch) locks the trunk.
When you say the remote does not lock the Tailgate have you tried locking the car and then in 15 minutes checking to see if the TailGate is locked. I know that the Fuel lid on all three of our Volvos do not immediately lock when the key fob is pressed but will lock after a short period of time.
I removed the panel on the tailgate this weekend to check some things. The motor/solenoid, if put into the "locked" position, will unlock if you hit the unlock button.
However, it will not lock when you lock the car. So, the motor itself is working, but my father-in-law thinks it might be something to do with the control module itself. Being an electrical engineer, he asked if I had a wiring diagram, not having one, I came here. Does anyone have the wiring diagram for a 2001 XC70, or know where I can find one?
Turns out, after some plug and play round robin, that one of the relays in the rear control board had failed. Volvo Part# 9441161.
I think this might also be why the RR door no longer locks/unlocks electronically.
Went to the dealership today and purchased a replacement relay for approx. $25, to say I guffawed when I looked up the price is an understatement. Most relays run the gamut of $2-5, $25 is quite a bit outrageous, but it's the going price.