Blower motor/FSR troubleshooting - Bimmerfest - BMW Forums

Welcome to Bimmerfest -- The #1 Online Community for BMW related information! Please enjoy the discussion forums below and share your experiences with the 200,000 current, new and past BMW owners. The forums are broken out by car model and into other special interest sections such as BMW European Delivery and a special forum to voice your questions to the many BMW dealers on the site to assist our members!

Please follow the links below to help get you started!

Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series & 4 Series > E46 (1999 - 2006)

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

Thread Tools Display Modes
Old 06-28-2012, 05:43 PM
Soupnutz Soupnutz is offline
Registered User
Location: Virginia
Join Date: Oct 2009
Posts: 39
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.
Reply With Quote
Old 11-02-2012, 12:54 PM
ahull's Avatar
ahull ahull is offline
Officially Welcomed to the 'Fest
Location: Carolina
Join Date: Apr 2006
Posts: 4,278
Mein Auto: ist schnell! (03 330i SC)
Good info - added link to wiki. Thanks Soupnutz.
Reply With Quote

See More Related BMW Stories

Forum Navigation
Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series & 4 Series > E46 (1999 - 2006)
Today's Posts Search
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump

All times are GMT -7. The time now is 10:13 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
© 2001-2015 performanceIX, Inc. All Rights Reserved .: guidelines .:. privacy .:. terms