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ECC Unit Removed (After Dash Removal), 1996 850 Turbo Topic is solved

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
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

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Re: ECC UNIT WILL NOT COME OUT, 1996 850 Turbo

Post by misha » Tue Jan 28, 2020 5:24 pm

On that bracket you have bendable pins on the left & right side.
Also...you have the same pins up & down the opening which tightly secures the radio when you put it in that bracket.
What i'm trying to say is that there is possibility that some of those pins on the upper side are not allowing an ECC unit to come out.
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Re: ECC UNIT WILL NOT COME OUT, 1996 850 Turbo

Post by Chuck W » Tue Jan 28, 2020 8:52 pm

Yeah, they're stubborn, but they just pop out of the dash as you push them from behind.
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Re: ECC UNIT WILL NOT COME OUT, 1996 850 Turbo

Post by RickHaleParker » Wed Jan 29, 2020 3:12 am

The ECC is held in place by tension from four band springs, two each side. My best guess is cold weather has caused the space between the springs and the frame to contract and tighten up. You might try placing a electric space heater in the cab and let everything warm up.

Watch the video, you will see the springs on the side of the ECC when Robert sildes the ECC out.
Good views of the springs after 2:38.

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Re: ECC UNIT WILL NOT COME OUT, 1996 850 Turbo

Post by jreed » Wed Jan 29, 2020 5:51 am

There is also a white pin on each side of the ECC unit that slots into a hole in the face of the opening.
Volvo ECC pin.jpg
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Re: ECC UNIT WILL NOT COME OUT, 1996 850 Turbo

Post by abscate » Wed Jan 29, 2020 6:24 am

Good luck with that, I’m sure it will come.

Mechanic convention

Parts are identified relative to the car, so

The REAR of the ECC control unit has the knobs and dials

You remove it by pushing the the FRONT of the ECC control unit towards the rear of the car, from under the dash, through the radio hole
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Re: ECC UNIT WILL NOT COME OUT, 1996 850 Turbo

Post by rick4484 » Wed Jan 29, 2020 1:24 pm

Thanks to all who've replied. I received my replacement unit and it looks just like image provided by jreed. I tried the heat method recommended by RickHaleParker, with a space heater and a hair blower, got the temp inside up to high 70's F, used the hair dryer for direct heat application, then tried to push it out toward the rear of the car as mentioned by abscate. BTW, that's how I've been trying all along, but it's not budging. I think I'll be removing the top of the dash to see what's hanging it up. I tried some metal putty knives, going in through the opening left by the radio, trying to slide them in along the sides to depress the side bands, but that's really awkward and so far no luck.

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Re: ECC UNIT WILL NOT COME OUT, 1996 850 Turbo

Post by Chuck W » Wed Jan 29, 2020 2:12 pm

I've used plastic putty knives or the like as prying implements on the front sides of the unit, to get really stubborn ones to move.

You just have to use a light touch, so as to not damage the dash surround.
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Re: ECC UNIT WILL NOT COME OUT, 1996 850 Turbo

Post by misha » Wed Jan 29, 2020 3:29 pm

Removing the top of the dash will be a waste of time since you will not have visual access to the ECC unit.

Push it harder....it needs to come out.
You will damage the trim with knives and things.
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Re: ECC Unit Removed (After Dash Removal), 1996 850 Turbo  Topic is solved

Post by rick4484 » Thu Jan 30, 2020 6:40 pm

SUCCESS!!!!!! Last night I tried again to remove the ECC Unit by pushing / pulling it toward the rear of the car , this time more forcefully, and heard what sounded like plastic cracking, at which point I stopped. The unit did not appear to have moved from it's position, so I decided to remove the dash the following day.

Once the dash was out I tried to see the retaining tabs on the passenger side of the unit. It's wasn't easy to see them, but I saw enough of them to work with. I used a long flat blade screw driver and worked it into the area to place it against the top passenger side tab and pushed against the tab while reaching behind the unit and pulling / pushing the unit toward the rear of the car. The top passenger side of ECC unit began to come out slightly, but the lower tab was still holding. I moved the screw driver down to the lower tab, repeated the process, and the right side popped out a little more. I then positioned the screw driver on the driver's side of the ECC unit, again from the top and, with limited clearance, was able to see enough of the tabs to press against them. I pressed the top tab first while grabbing the unit and pulling on it. The entire unit then popped free and I disconnected the wiring. Once the unit was completely out I looked at the tabs, comparing them to the replacement unit and saw no differences. I don't know why the original unit was so difficult to remove, but it's been in there 24 years so maybe the metal tabs were losing their spring effect. I'm thinking about using some silicone grease on the tabs of the replacement unit before I install it.

I wonder why the original ECC Unit failed, I might open up the housing and look for capacitors that might show signs of damage.

Update: The reason I replaced the ECC Unit was because of the blower running at full speed when the key was in the on position, so whenever the car was running the blower was full blast and could not be controlled by the ECC. When the engine was off, and key was off, the blower stopped. I replaced the Blower Motor Resistor earlier, which did not correct the problem, so the ECC Unit was bad.
I replaced the dash, reconnected everything and turned on the key, problem is fixed I tested the replacement ECC Unit and now my controls are working properly.
.
Thanks to all who replied, your posts were helpful and inspiring.
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Re: ECC Unit Removed (After Dash Removal), 1996 850 Turbo

Post by scot850 » Thu Jan 30, 2020 9:52 pm

Well done! Shows that a little lateral thinking and persistence take you a long way.

Neil.
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