JGPierce

I'm looking for some electrical help. What should the voltage be at the door contacts that turn on the dome lighting (i.e. at the brown/white wire connected to the door switch)?

I am getting 7.6V at both door contact brown/white wires. The switches have been cleaned and work as intended, keeping the interior dome lights on for ~20 seconds. The alarm module internal relay clicks as it should.

I've followed the wires from the doors, through the A-pillars, and under the dash and the plastic sheathing around the wire is intact.

I would've thought that the voltage should be 12V, similar to the frunk and engine bay lighting brown/white wires.

Thoughts? Could someone check this on their car?

Thanks.

JohnK964

I thought those wires were grounds as in with doors and such closed no contact open they goto ground

JGPierce

I thought so too. The electrical diagram isn't that helpful.

The door switches work as intended so it's weird.

Don't know if someone wouldn't mind using a volt meter and putting one lead on their switches and the other to ground to see what they get. Maybe my alarm system is wonky.

ToreB

Measuring voltage on the door switch is not very relevant. There is a weak pull-up resistor in the door lock control unit, and the switch grounds this when the door opens. The GND signal is the one that triggers things, not the pull-up voltage.

Cheers,
Tore

JGPierce

Thanks Tore!