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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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Old 06-28-2012, 05:43 PM
Soupnutz Soupnutz is offline
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Mein Auto: mustang GT, 330i
Blower motor/FSR troubleshooting

Posted this on fanatics, figured I'd post it here also.

I know this is a common problem, (one which I'm having). I've found several posts diy'ing how to replace either the motor or the FSR but not a post on how to easily determine which one is bad, so I thought I would post this.

I think it's easier to do it from the FSR connector, which takes about 10 minutes to get to. But read for 12vdc on pin 2 which should be hot at all times, then make sure you have a good ground on pin 4. Next install jumpers from pins 1-2 and from 4-5, the motor should kick on. If your voltage and ground is good and the motor doesnt run then it is bad. If the motor runs than it's almost certainly the FSR. At this point you can take it a step further and eliminate the hvac module if you want. Hook a meter set to vdc onto pins 3 and 4 of the connector. Turn on the ignition, with the a/c turned off you will get 0vdc, as you turn it on and turn the blower up to full power it will range from 2vdc at the lowest setting to around 10vdc at the highest setting.

If all of that is good, its the FSR.
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Old 11-02-2012, 12:54 PM
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ahull ahull is offline
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Mein Auto: ist schnell! (03 330i SC)
Good info - added link to wiki. Thanks Soupnutz.
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