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95 Volvo 850 blower motor will not come on

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

toddrl72
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Year and Model: 1995 850 Turbo
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95 Volvo 850 blower motor will not come on

Post by toddrl72 » Wed Oct 16, 2019 9:51 am

Cannot get blower motor to work on an 850 turbo I pulled the blower and it works when hooked direct to battery power
I'm getting a 124 and a 418 code from the ECC can someone help with this?



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RickHaleParker
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Re: 95 Volvo 850 blower motor will not come on

Post by RickHaleParker » Wed Oct 16, 2019 2:05 pm

1-2-4 Driver’s side interior temperature sensor open circuit or shorted to 12 volts.
4-1-8 No control signal to blower fan power stage.
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Platform: P80 1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0, Plant Torslanda Sweden.
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1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

toddrl72
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Joined: Wed Oct 16, 2019 8:59 am
Year and Model: 1995 850 Turbo
Location: Maine
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Re: 95 Volvo 850 blower motor will not come on

Post by toddrl72 » Wed Oct 16, 2019 9:00 pm

So what does the no signal to power stage mean? No signal to the blower resistor or no signal to the blower motor?



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RickHaleParker
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Re: 95 Volvo 850 blower motor will not come on

Post by RickHaleParker » Wed Oct 16, 2019 10:35 pm

The 1995 850 has Power stage (Power Transistor) between the blower motor not a Resistor Pack.
The Power stage is what you are incorrectly calling the blower resistor.

Look for shorts, opens in the loom between the ECC and the Power Stage. It could be the Power Stage but check the wiring first. There is a remote chance it is a defect in the ECC, considering the age of the car don't discount the ECC but check the other two things first.
95_850_ECC.png
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Platform: P80 1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0, Plant Torslanda Sweden.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

toddrl72
Posts: 5
Joined: Wed Oct 16, 2019 8:59 am
Year and Model: 1995 850 Turbo
Location: Maine
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Re: 95 Volvo 850 blower motor will not come on

Post by toddrl72 » Fri Oct 18, 2019 1:23 pm

Does anyone happen to know where the cabin temp sensors are located. It says in headiner above drivers and passenger seat. Is that correct. I got power to the blower motor but not getting a ground connection.



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RickHaleParker
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Re: 95 Volvo 850 blower motor will not come on

Post by RickHaleParker » Fri Oct 18, 2019 5:51 pm

The Power Stage grounds the blower motor.

Look under the grab handles above the doors.
Last edited by RickHaleParker on Fri Oct 18, 2019 6:22 pm, edited 1 time in total.


Platform: P80 1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0, Plant Torslanda Sweden.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

toddrl72
Posts: 5
Joined: Wed Oct 16, 2019 8:59 am
Year and Model: 1995 850 Turbo
Location: Maine
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toddrl72

Re: 95 Volvo 850 blower motor will not come on

Post by toddrl72 » Fri Oct 18, 2019 6:18 pm

Ok I get it. The sensor is in the headliner. How do I get the headliner down?



toddrl72
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Year and Model: 1995 850 Turbo
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Re: 95 Volvo 850 blower motor will not come on

Post by toddrl72 » Sun Oct 20, 2019 9:46 pm

The power stage was bad. Thank you so much for your help with this.



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