Ecc flashing lights-blower not working.

[BEJinFbk]

Sure - Here are the diagrams:

98 ECC.pdf

(522.35 KiB) Downloaded 205 times

98 S-V70 ECC component locations.pdf

(370.25 KiB) Downloaded 224 times

There are two systems that shipped in these cars,
and they're both in these PDF's, but the parts that
you're checking are the same in both.
The power stage is 4/31 and the blower is 6/28.

The blower gets 12 volts when ever the key is on from the
Yellow/Violet wire. The blue wire from the power stage
to the blower is an ECC controlled variable resistance to
ground to change speed.

[configsys]

Bear in mind that the 850's and V70's shipped with two systems.
The Manual Climate Control (MCC) is a pretty basic setup.
The Electronic Climate Control is automated and "smarter".

I think you may be confusing the MCC ( that uses actual resistors
for the lower blower motor speeds ) and the ECC that your R has.
ECC uses the mosfet based electronic power stage for the blower.

A lot of confusion results from people calling the power stage a resistor. It's not.
It's more of an ECC controlled variable output power supply for the blower motor.

One of the big differences is that the 4 speed MCC has a full speed override relay
that totally bypasses the low (1,2 & 3) speed resistors for the highest speed, #4.
If MCC runs at speed 4, but not the lower speeds, it's often a bad resistor pack.
With the ECC, the power stage is variable and provides power to the blower motor
at all speeds. If the mosfet dies, it'll usually short and be full on, or open at full off.

Something else that may be shutting you down is a dirty cabin air temp sensor.
It's worth taking a minute and giving it a shot of canned air. That may work.
I've had to do that twice in 7 years to clear the blinkies...

tempsensor.jpg

If you need real answers, the ECC has a diagnostic system, but you'll
need a propietary Volvo tool plugged into the OBD ll port to read them.

Was out of town for a week and came back and drove my '00 V70R and tried turning on the A/C. Blower turned on for a moment than shut down after a few seconds then came the flashing lights. Read this post here but didn't have a canned air so used the leaf blower I had;-) It seems to work now - Thanks!!!

[wizechatmgr]

I'm guessing you're a fellow IT'er based upon your username? =)

[configsys]

I'm guessing you're a fellow IT'er based upon your username? =)

You guessed right!