Our MY2015 Volvo XC60 is suffering some electrical problems, presumably after the sunroof drains blocked and water ingressed.
When my wife came back after 2 weeks away, there was a lot of water in the driver side footwell. She baled the worst of it, then dried the rest the best she could. The weather was quite warm, so she left the windows open to allow the remaining water to evaporate.
When I came back another 3 weeks later, I noticed some electrical problems. I don't know that anyone drove the car in the interrim, so I can't say whether the water ingress caused these problems immediately, or whether they occurred before or after the ingress.
Notably:
- The sunroof controls don't work at all.
- The control panel for the radio doesn't work, e.g. the volume control, the tuning control and the numpad are non-functional. I can still reset the head unit with the power button, and there's some activity on the center console screen when I press the power button.
I can operate the menus etc. from the steering wheel controls, though. - There is no audio from the radio.
- I can dial my phone and it thinks it's connected to BlueTooth, but there's no audio and no microphone pickup.
- I manually opened the sunroof and cleaned the drains. I hope there's only the front ones - is there more to do?
- I found a wiring diagram online.
- I tested all the fuses in the engine compartment and under the glove compartment. They're all good.
- I found a friend with an OBD2 scanner and hooked it up. Neither his FIXD app nor Torque Pro found any codes. I don't know that this amounts to a hill of beans, though. From what I understand I need something like VIDA to navigate and interrogate the module tree?
- I pulled the drivers side door seal and trims to look at the floor harness. It looks fine, though it's still a little wet.
- I started pulling the driver side A-pillar trim to look at the connector in the A-pillar. I ran out of time before I was quite into it, though the connector looks just fine from a distance. Where it's placed, I doubt the water would have ran through or over it, though I'm more than willing to be persuaded otherwise.
In the past I've done component-level electrical repairs on old test gear and on home appliances, so I have DMMs, a clamp meter, oscilloscopes, the works. I'm comfortable with schematics and component-level repairs, though car electronics and the Volvo wiring diagrams are new and still a bit of of a mystery to me.
I'm looking for advice on where to go next.
Is there e.g. a connector or a harness in the MY2015 XC60 that's common to the sunroof module and audio?
Is there a well-known thingymabob that gives up the ghost when the driver side footwell floods?
Can I test voltages at point X and get a brilliant insight?
I'm all ears, edumaficate me!
If you're in the greater Montreal area and you have a VIDA setup and some time to spare, I'd love to pay you a visit. The pizza and the beer are on me
.Thanks in advance,
Siggi