C70 Master Window Switch

Bay1 · Post by **Bay1** » 15 Apr 2011, 16:16

My 99 C70 Convertible pass window was stuck down. Master switch and door switch will not move it. Pulled the panel and disconnected the switch, put 12V to the motor and window worked fine. Brought a new door switch, same problem. Ordered a master switch, be in Monday. Now I hear there is a relay under the dash some where. I feel it is the master switch cause all the other windows and locks work.
If the relay is bad, will all the other windows and locks still work?
My question is what is the procedure to determine if it is the master at fault or the relay? Does the master feed the other switches after going through the relay or before? I need to know what circuits to check for voltage. Tried to use the search function, but I cannot narrow it down to this specific question.

Thank you....

v70xc · Post by **v70xc** » 25 Apr 2011, 23:13

I have a similar issue.
1998 V70 AWD Turbo
I can't raise or lower any of the windows from the Master switch on the driver's door.
From the Right Front door, it can work its own window up/down.
None of the Rear Doors can operate their own windows.
Master cannot control any windows.
The Master has a Blue wire (+12V) and a Black wire (ground) which appear to test ok.
When I take these Blue and Black and lead them to the window motor (the motor which I know is good) I get no action out of the window.
When I take another 12V battery and connect it to the window motor, the motor functions up and down (correctly) as I inverse the polarity.

Taking a lead from the blue and the black of the white plug gives me no action when directly connected to the motor in any configuration.

I have no idea what to look for as a relay under the dash.
Any clues as to colour, size or location?... any hints would be great...
I have found relay 2/30 in the main fuse tray once I removed the 4 torx and there they were ... relays with bit white "J" on them...
I wanted to find it to be blown, it is fine…

I have cleaned all contacts on the master control.
As best as I can remember, when I was noticing the windows to be becoming problematic, I do recall hearing a sound of burning connections or shorting connections coming from the master switch, ...I am wondering if that could indicate that something on the circuit board burnt and cannot be tested?
I don't have a junk yard around with Volvo parts.... so... to simply get another part (driver's door master switch) for testing, could easily cost my $400. Not the diagnostics I wish to afford

Any pictures and information would be greatly appreciated since I will be looking at going to a mechanic on Thursday, since I need the car for a trip in a few days ....
Things only happen when we are pressed for time

Thank you..
ps: you keep me posted and I will do the same

thanks and best of luck fixing your issue that I share

info
Details and pics always appreciated

Post by **jimmy57** » 25 Apr 2011, 23:58

convertible is unique. It has a window control unit under dash on driver's side above /near accel pedal(LH drive versions).
The function where windows drop a bit for top operation requires the central operation of all windows by a single signal from top CU.
It could be relay for that window that is soldered to the board in the window CU.
The driver's master switch is unique to convertible too. It has far fewer wires and contains resistors so up and down are different voltage on the same wire per window. Regular master for S/V70 will not work. The S/V70 switch also is missing the global window switch.

v70xc · Post by **v70xc** » 27 Apr 2011, 12:25

C70 master: might you be dealing with flaky power as I thing I am dealing with? I am told that if the master does not work its own window, none of the others will work neither, but in my case, I can still operate the front passenger window from the front right door switch even though none of the other three windows operate from their own switch or from the master.
Here is something else to add to the thought process, I also tried to activate the window motor on the driver’s door with another 12V source and found that the motor works fine.
I am going to use that 12V source and directly connect the source Red (+) to the Blue wire on the white plug and then connect the source Black (+) to the Black wire on the white plug, having the white plug attached to the Master window switch and see if I can now use the Master Switch to raise and lower at least my driver’s window.
After messing with this for way too long now, it appears as though the blue power line in the door is not as stable as I thought. I have checked it a few more times from the white connector to ground and have been getting anywhere from 9.5V to 12V. Pulling ever so slightly on the blue wire has me thinking that I don’t have a good connection where the wiring harness for the door connect to the wiring harness receiver going to the engine compartment.
I have tried to probe the harness connector to find out where the blue wire connects to the 24 pin harness, no luck. Does anyone have the layout of the wiring harness connector so that I know what I am going after? I managed to find out where the black (ground) goes to on the harness (pin 18) but can’t find that Blue one on the door harness. The attached picture shows where I have found the negative Black wire connection on the wiring harness from the door.

: Wire_Harness_Driver_Door_Negative_Connector.jpg (114.19 KiB) Viewed 4477 times

.
I may have to remove the door to get to harness and see what I can do about getting a solid 12V into the door.
Any pictures, diagram or input of any sort is greatly appreciated.
Thanks in advance.

Post by **jimmy57** » 27 Apr 2011, 13:46

download the wiring diagram from the repair database and look at convertible window page to see the differences between it the non-convertibles. what probing and checking you do will vary greatly due to the driver's control being a signal switch set instead of a current switching device as it is on the NON-convertibles.
I'm not saying problem isn't the switch or the body connector for the door. I'm saying the jumpering and probing will not get you the same result on convertible as it does on the direct wired other variants.

v70xc · Post by **v70xc** » 27 Apr 2011, 13:56

Thanks Jimmy57.
I have looked at what I was able to find for a wiring diagram and could not find where it is that they might list what harness pins connect to what wires. Mine is the 1998 V70 XC AWD Turbo (wagon, non-convertible.
Have you been able to find the pin outs? Maybe I am just blind after looking at this so long

Bay1: Hope you have not done like I have and assumed power to be good at one time and therefore to be good all the time. I am seeing power fluctuations depending on exactly how far open or closed the door is. I was then following through to see if there are fluctuations when I squeeze along the wire harness... and it appears that the voltage does fluctuate.
I really think I am tracking down a bad power feed through the door harness... if ever I can find the pin outs. Sounds to me that I might be seriously removing the door tonight or this weekend.
Thanks everyon

v70xc · Post by **v70xc** » 27 Apr 2011, 17:48

I have found that by applying the leads from a 12V battery directly to the blue and black wires in the white connector and attaching the white connector to the Master window switch, everything lit up and the windows work. Showing me the switch is good and the only thing to do now is to find out where the blue wire is suppose to connect on the wiring harness.
Negative is going to pin number 18, if anyone knows what pin the Blue 12V is suppose to go to, I am all ears.

thanks
Volvo V70 AWD Turbo non-convertable. I have looked over the wiring diagrams I have found and still don't see what pin it is suppose to connect to. Hopefully someone out there can see more than I am seeing.
Thanks again.
Guess it is time to run to the hardware store and see if they carry torx wrenches in order to remove the doors two 10mm bolts. I believe they are 10mm, correct?

v70xc · Post by **v70xc** » 04 May 2011, 20:52

I had two wires in the connector shown in the above picture that were dying.
Both dead connection, along with 5 others as preventative maintenance had to be replaced.
It was not fun. Door removed, new female ends had to be found and replace.
Packed with di-electric grease.....
I had a cracked inside left wheel skit allowing much humidity, dirt and maybe even water to get where it should not go.
Best of luck.
Need more info? Send comments here and I will tell you what I can

scgator62 · Post by **scgator62** » 10 Dec 2014, 15:01

My 99 c70 convertible had a slight burning smell, saw a little smoke from the drivers door near the front. All window controls from master and individual windows stopped working. The windows move when I engage the convertible top button. I have checked the fuse under the hood it is fine. I have read there is a relay under the dash near the gas pedal that controls the top and windows. Where exactly or at least what am I looking for? I thought I would try to clean it and see if that works or replace. The other step is to unwrap all wires and look for a burnt wire. The master is not getting any power. Any help is appreciated.

v70xc · Post by **v70xc** » 10 Dec 2014, 21:56

This is just a guess but if that were me, I would be taking off the driver's door pannel and looking at the master window control to see if you are at least getting power to it. That is how I found one of my previous problems. By finding that power was not getting to the master control, it then directed me to looking to the connector at the front of the door. It is not an area of the car that is easy or fun to work at, but that is where I found I was having damaged connections which were causing many of my window problems.
post back with info, out comes and progress.

Good luck