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'98 C70 seats - clicking noise when I move the switches

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jsloden
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'98 C70 seats - clicking noise when I move the switches

Post by jsloden »

Hey guys, just picked up a 98 c70 coupe. Not sure how the seats are supposed to operate in it. I know the passenger one is messed up because it doesn't move at all. I can hear a clicking noise though when I move the switches. The driver side seat moves just fine when I move the switches but I thought it was also supposed to move when you tilted it forward. It doesn't do this though. Any help is greatly appreciated.

Thanks
Last edited by matthew1 on Wed Dec 27, 2017 5:43 pm, edited 1 time in total.
Reason: improved title, added tags

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rspi
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Post by rspi »

Probably have bad switch pack on the passenger side.
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jsloden
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Post by jsloden »

The clicking I'm hearing was more that just the switch clicking. I can actually hear what sounds like a relay clicking under the seat. It just doesn't move though. I guess it could be the motor but I assumed there was more than just one motor under there. I would find it hard to believe that none of them work.

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Post by scot850 »

I'd remove the seat if you can, and have a look under it for broken wires. The fact you get clicking from the motor would suggest it has either hit a limit stop or has a stripped drive cog. Again easiest to see it by removing.

Not clear what you mean by the seat doesn't move when tilted forward? Does the back rest angle change when the seat back is fixed in place?

Not had a 2 door so not familiar with the operation of the backrest.

Neil.
2000 V70 R - still being an endless PITA
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jsloden
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Post by jsloden »

Gotcha, I'll take the seat out and see if I can tell any more. With it all the way back like it is now it makes it pretty hard to actually see under it. The coupe has a separate manual lever on it that tilts the back forward so you can get into the back. As the seat flips forward its also supposed to slide forward as well, of course, since nothing works on the passenger side it's not going to slide forward even though you can still pull the lever and flip it forward. I was wondering if it's also supposed to do this on the drivers side as well since all of the other functions on the drivers side seen to be functioning normally.

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RickHaleParker
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Post by RickHaleParker »

Look under the passenger seat and press the switch to move the seat. Does one of the mechanical cables tense but not the other? Over time the plastic jacket expands and the core backs out of the motor. If this is the case the "quick fix" is to shorten the plastic jacket by ~3/8" and press the end cap back on. You can get a better idea how much needs to be cut off by measuring the slack of the core.
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD. Yamaha V8 conversion
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.

jsloden
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Post by jsloden »

Ok, got the seat out. The two big plugs that plug into the back of the control module were un-plugged. I wish I could say that I plugged them back in and it started working, unfortunately, that's not what happened. Still didn't work. I then noticed the micro switch that some people have talked about. It seemed to be in place. That little metal piece that is supposed to come down and make contact with it doesn't seem to have any kind of force behind it. I read about some people saying that sometimes a spring breaks that makes this piece operate. Would this be the case?

jsloden
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Post by jsloden »

Ok, set the seat back in the car. The seat now works as long as I hold the micro-switch down with my finger. The cam that is supposed to press it down doesn't because I think there is a spring missing. Anyone had this issue?

Thanks

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Post by jimmy57 »

In the lower seat back under cover is a switch that shuts down seat if it thinks the seat is tilted forward for rear entry. That switch has history of coming loose. You can connect wires and it will work regardless of seatback postion if that is what is wrong.

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RickHaleParker
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Post by RickHaleParker »

The seat now works as long as I hold the micro-switch down with my finger.

Had the same problem on my C70. Yes there should be a spring but the other end of the spring was anchored by a plastic part that is broken now.

This is my solution and it has been working for three years without any problem.

From the front, feel up the post of the seat back. Your find what feels like a square hook.
Clear the hole at the end of the micro-switch cam.
Feed a hair elastic through the hole and pull it back through itself. The ones that look like a cloth covered rubber band.
Hook the other end of the hair elastic on the square hook.
This will keep the cam against the micro-switch.
1998 C70, B5234T3, 16T, AW50-42, Bosch Motronic 4.4, Special Edition package.
2003 S40, B4204T3, 14T twin scroll AW55-50/51SN, Siemens EMS 2000.
2004 S60R, B8444S TF80 AWD. Yamaha V8 conversion
2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0.

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