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Old 4th June 2024, 22:10   #1
TomTheTyke
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Default Intermittent Drivers Window Switchpack Fault

Hi all,

As above, have developed an intermittently faulty drivers window switch pack.

Keeps occasionally needing multiple presses to operate any window, seems to temporarily fix itself sometimes, others it takes a minute of pressing to get a response.

Iíve had the switchpack apart, contact cleaner to the PCB and cleaned the membrane, but no difference. Iíve also sprayed contact cleaner on the connectors.

I did notice the mirror selector led was faint / flickering. Could this be a bad earth? Where does it earth?

Which fuses (which fuse box) should I check?

I want to exhaust other options before buying a replacement switch pack.

Thanks in advance, any help much appreciated.
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Old 5th June 2024, 05:57   #2
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Keeps occasionally needing multiple presses to operate any window, seems to temporarily fix itself sometimes, others it takes a minute of pressing to get a response.
Apply silicone spray to the glass channels in the door frame Tom. This worked on Lida's car when she had the symptoms you've described.

Simon
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Old 5th June 2024, 22:18   #3
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Apply silicone spray to the glass channels in the door frame Tom. This worked on Lida's car when she had the symptoms you've described.

Simon
Thanks Simon. Iíve given it a try.
Am I missing something obvious though as Iím not sure on the logic of this? It seemed more electrical than mechanical, given that when the switch isnít working it wonít operate any of the 4 windows.

Is the switchpack throwing a wobbly because the glass is sticking?
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Old 6th June 2024, 05:35   #4
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Thanks Simon. Iíve given it a try.
Did you treat all four doors and did it work?

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Old 8th June 2024, 09:49   #5
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Unfortunately this made no difference.

I press the one touch down and it goes half way down then I hear the relay click and the window stops. Also happens passenger door using the passenger door switch.

I have given all the a pillar earths a blast of contact cleaner but they seem tight.

BCU?
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Old 8th June 2024, 18:51   #6
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I did notice the mirror selector led was faint / flickering. Could this be a bad earth? Where does it earth?
I've looked at the wiring diagrams for you Tom and the mirror switching circuit shares an earth with the front driver's side window switch (DDM: Driver's Door Module).

The earth is C0706 which is located behind the carpet at the base of the RH 'A' pillar. There are several earthing points here; you need the lowermost, nearest the floorpan. It will have a total of eight black wires attached to an eyelet.

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Old 10th June 2024, 17:21   #7
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Thanks Simon. I found that earth, though as you say there are a few down there, nothing felt at all loose and I have them all a good blast of contact cleaner but itís made no difference.

Iíve also gone back and given everything a more thorough dose of silicone spray.

But as I said earlier surely all 4 windows experiencing issues suggests electrical rather than mechanical. It also did affect the switches on the other doors.

This leads me to query the BCU. The Pektron units as in my TF fail for fun and have spawned several mail order businesses specialising is soldering in new relays - Iíve not read much about failures here. I can definitely hear the relay clicking off when the window stops even though the switch is pressed, though again that could be a signal issue.

Any suggests as to what order to try things?
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Old 10th June 2024, 17:50   #8
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If you have Toaf, or some kind soul locally has, you can activate each of the windows using the programme which will prove the BCU is working (or not).

Anyone locally who you could borrow a master switchback from, alternatively can't cost that much at a UK breaker's.

Good luck
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Old 10th June 2024, 19:10   #9
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I found that earth, though as you say there are a few down there, nothing felt at all loose and I have them all a good blast of contact cleaner but itís made no difference.
Hi Tom,

You've said previously that you suspect this earthing point. What you need to do is to remove the screw and check that all the eyelets are bright and shiny as well as the contact surface on the body. If all this is in order then turn to the power supply feeding the flickering mirror selector LED.
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I can definitely hear the relay clicking off when the window stops even though the switch is pressed ...
Which window? Just the driver's side or all of them? If we're to narrow this down we need detail!

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Old 12th June 2024, 06:43   #10
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Update. I found the earth, it was the lowermost at the RH side tho I only counted 7 wires to it. Iíve cleaned it up.

On the drive everything worked fine.

This morning on the way to work, back to the flickering light and the operation of the windows worse than ever. The light flickers and the relay clicks, whichever window I am trying to lower.

I have ordered a replacement switch pack, from a breakers just to rule that out.
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