Passenger Side Power Window no workie.

[sjanes]

This is on a 87 911.

The driver side window works fine. I replaced all three switches with new ones. I took a multi-metre to the passenger switch and both blue wires and both red wires have 12V.

Is that normal? How does this switch work? I looked at the wiring diagram in the Bentley manual and I don't understand why they have power with the switch in the neutral position. When both blue wires are disconnected from the switch, they both have 0V, but when I connect one, they both have 12V.

I was going to take the motor out, but the instructions say to lower the window mechanism, but without power, the window is stuck up.

Any ideas?

Thanks
Stacy

[dannobee]

It's probably the motor. Whack on the inner door panel a few times while operating the switch. If it works, keep cycling it until the brushes reseat against the commutator.

[sjanes]

Thanks. I have the door card off, so I can whack on the motor itself.

I've read in some other threads about a Torx bolt that can be used to manually wind the window up/down but I don't see it on this car, so maybe introduced in 89?

[AG81]

Originally Posted by sjanes

This is on a 87 911.

The driver side window works fine. I replaced all three switches with new ones. I took a multi-metre to the passenger switch and both blue wires and both red wires have 12V.

Thanks
Stacy

^

Me too.... pretty common I hear. I plan on taking a wack at it tonight. By wack I mean a hammer to the motor case.

[86 911 Targa]

^^^^^
Pics from our '86.

Best,

Gerrry

[86 911 Targa]

^^^^^
You will need to cut & paste the factory manual.

Best,

Gerry

[sjanes]

Thanks Gerry. By looking at that wiring diagram, it looks like 12v on the blue wire with the switch in the neutral position is correct.

I tried whacking the motor, no love. Looks like the motor may be kaput.

[76FJ55]

Have you verified that the brown wire has good connectivity to ground?

[sjanes]

I tested the power on the red/blue wires using brown as the ground for my multimeter. Is there a different test I should do?

[AG81]

Both switches replaced......a few light wacks of the hammer on the motor case and the passenger window is good to go........ Super happy.....

[shuzboomer]

Originally Posted by 76FJ55

Have you verified that the brown wire has good connectivity to ground?

I have an issue related to ground; my driver side switches don’t work.

If I hard jump them to the door frame, everything works just fine.

I am very confused!

RBL