Door closed sensor failed? / continuous chime

beewstew · Post by **beewstew** » 12 Mar 2025, 06:55

Working on a 3rd hand 2004 xc70.

When all doors are closed and the car is running, the red ! on the dash lights up, the message panel reads "the door is open dummy!", and the 1Hz indicator chime is continuous (for 10 minutes or so of driving).

I can block the chime out with the radio, but the interior lights stay on and drain the battery.

The best way to fix this is probably a junkyard driver door lock module? Is that where the door closed sensor lives?

I haven't spend the money for an aliexpress vida/dice module yet. Is that the proper way to diagnose this sort of electrical problem?

Post by **volvolugnut** » 12 Mar 2025, 07:35

One of two things may have failed.
A wire from door to the wire harness goes through the door jamb may be pinched or broken.
The door module may have a failed sensor or wiring fault.
Replacement door modules may need to match your old module to sync with the computer.
volvolugnut

beewstew · Post by **beewstew** » 12 Mar 2025, 07:46

@volvolugnut thanks! I'm new to this. What do you mean by "Replacement door modules may need to match your old module"

Does it have to come from a 2004? From a 2004 xc70?

Post by **br0dy519** » 12 Mar 2025, 09:56

He means the module part number has to match exactly the one in your car. You would have to pull yours first to verify.

I would start by disconnecting the wiring harness at the door (it's in a corrugated rubber boot looking thing) and spraying it with a contact/electronics cleaner on both the male and female plug and plug/unplug it a few times to clean up the connections. It may just be a tarnished contact on either side.

Post by **firstv70volvo** » 12 Mar 2025, 11:26

beewstew wrote: ↑12 Mar 2025, 06:55 Working on a 3rd hand 2004 xc70.

When all doors are closed and the car is running, the red ! on the dash lights up, the message panel reads "the door is open dummy!", and the 1Hz indicator chime is continuous (for 10 minutes or so of driving).

I can block the chime out with the radio, but the interior lights stay on and drain the battery.

The best way to fix this is probably a junkyard driver door lock module? Is that where the door closed sensor lives?

I haven't spend the money for an aliexpress vida/dice module yet. Is that the proper way to diagnose this sort of electrical problem?

Within the door lock/latch module there are two microswitches, one for the door open/close status and one for the door lock/unlock status. These switches do create problems and you can't access them to clean or repair them. A used or new door module will likely be needed for the fix but it can also be an open wire but this is a less probable cause for this problem, it's usually a switch in the module.