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2000 S70: Drivers side damper motor, unknown ECC codes

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
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2000 S70: Drivers side damper motor, unknown ECC codes

Post by itsmekirby » Sun Dec 18, 2016 6:40 pm

My drivers side climate control is stuck on cold, it's not the best for this time of year, I've been surviving on the heated seats to be honest. Anyway I finally decided to take a look into it, I get the blinky ECC lights but don't have a code reader. I could get an OBDII reader but I'm under the impression those can't read ECC codes, right?

I figure I could remove the damper motor while leaving it plugged in, see if it's turning or not, but I'll need to get ahold of one of those flexible bit drivers because I can't reach the screw that is supposedly on the far side. Photos attached. Am I looking at the correct motor? I can't feel it doing anything when I adjust the temperature setting, which leads me to believe the motor itself is shot and not the shaft.

Are there any easy fixes (temp sensors?) I might be missing? Is it possible to read the codes without spending more than $50?
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IMG_20161217_160124.jpg
IMG_20161217_160031.jpg

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Re: 2000 S70: Drivers side damper motor, unknown ECC codes

Post by abscate » Mon Dec 19, 2016 4:44 am

A good reader that reads ECC module codes will cost $150 or so, or you can setup VIDA fir about $100.

That motor controls both the blend and the distribution on the late 1998(?)-on ECC so it is probably the culprit
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Re: 2000 S70: Drivers side damper motor, unknown ECC codes

Post by sleddriver » Mon Dec 19, 2016 12:47 pm

I had a similar problem. Turns out the ECC was faulty, not the damper motor.
I adjusted mine using a 9V battery and DIY wiring harness.
Read here:
2. ECC lost it's head, blowing 100% HOT air towards drivers side. Pulled ECC code indicated a faulty driver temp control damper motor. Pulled & tested; it was fine. Extensive schematic reading & voltage testing revealed the ECC was itself faulty and wasn't capable of testing itself: Above ckt had a faulty motor driver that wouldn't reverse polarity. $100 for local & on-line used part. Got lucky and found one in a PNP for $16 that actually worked. Also discovered fault in Autodiagnos' motor calibration program.

98 V70 ECC-211 Damper Motor Position Sensor Fault
98 V70 ECC Driver HOT Passenger COLD Issue
1998 V70 T5 226,808 miles. Original Owner.
M1 10W-30 HM

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Re: 2000 S70: Drivers side damper motor, unknown ECC codes

Post by itsmekirby » Sat Jan 28, 2017 9:52 pm

Interesting. I pulled the motor and confirmed that it isn't turning. Then I checked the wires with a multimeter and made the following measurements:
[ ] Pink white 5V
[ ] Yellow red 4.9V
[ ] Red white 0.5V when still 11V after turning temperature control
[ ] Red black same but delayed couple seconds after turning temperature control

Comparing against this schematic:

I assume this is part 6/45, looks like a motor with some kind of buffer/relay? Anyway these measurements don't really make sense against the schematic, but I'm kind of reading tea leaves and don't really understand how this connection is supposed to work. Anybody know if this proves if the fault is in the motor or the ECC?

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Re: 2000 S70: Drivers side damper motor, unknown ECC codes

Post by Ozark Lee » Sat Jan 28, 2017 10:32 pm

Assuming that 6/45 is the correct motor (without the secret decoder ring I can't say for sure) then the motor control voltage is applied to the Red/White and Red/Black wires and the polarity will change depending on whether or not it is opening or closing. The Yellow/Red wire is a sample voltage that tells the system what position the damper is in. That portion of the motor assembly is essentially the center tap on a volume control and the voltage sample will vary based on damper flap position. The voltage between the Pink/White wire and the Brown wire should be constant.

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Re: 2000 S70: Drivers side damper motor, unknown ECC codes

Post by itsmekirby » Sun Jan 29, 2017 1:56 pm

Ah, I see how it works, thanks for the explanation. Given that the R-W and R-BL wires respond to the temperature knob but the motor doesn't turn, sounds like the motor itself is at fault. Found a used replacement on ebay shipped from Germany for $55 shipped. Thanks everyone!

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Re: 2000 S70: Drivers side damper motor, unknown ECC codes

Post by leftyref56 » Sun Dec 10, 2017 5:46 pm

The motor you have pictured does not control the heat. It is the motor that controls the air to the floor or to the defrosted. The heater motor is down lower on the driver's side.
I have the same car and need to repair that motor as I don't have defrost.
Bob

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Re: 2000 S70: Drivers side damper motor, unknown ECC codes

Post by abscate » Mon Dec 11, 2017 4:34 am

I think I have a spare for sale in the parts forum under "parting out 1999 "


Search by part number listed in this post

viewtopic.php?f=7&t=78551&p=457007#p457007
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Re: 2000 S70: Drivers side damper motor, unknown ECC codes

Post by Chuck W » Tue Dec 12, 2017 10:24 am

I think the DIY code read set-up works for the 2000's, as well. I made one up to fix the ECC stuff in the wife's '97 GLT.

(see here viewtopic.php?t=79406

(I may be wrong about this working on the 99-00 cars, but I'm sure someone else will add input if necessary)
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Re: 2000 S70: Drivers side damper motor, unknown ECC codes

Post by jvl » Sun Jan 21, 2018 11:15 pm

Chuck W wrote:
Tue Dec 12, 2017 10:24 am
I think the DIY code read set-up works for the 2000's, as well. I made one up to fix the ECC stuff in the wife's '97 GLT.

(see here viewtopic.php?t=79406

(I may be wrong about this working on the 99-00 cars, but I'm sure someone else will add input if necessary)
I have a MY2000 v70xc and unfortunately did not get this code reader to work. I had read about it only working up to '98 cars before, but decided to try anyway, no luck!
1999 V70XC. Stock, except.... I like tinkering:
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audio
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