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E85 / E86 Z4 (2003-2008)
E85 Z4 Roadster, E86 Z4 Coupe, E85 Z4 M Roadster, and E86 Z4 M Coupe talk with our BMW gurus here.

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Old 01-16-2011, 04:34 PM
Aussiegreens Aussiegreens is offline
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Location: Australia QLD Gold Coast
Join Date: Jan 2011
Posts: 2
Mein Auto: 2008 Z4 Coupe 3.0SI
Corrosion issue with SRS airbag

well this should prove to be interesting i have just experienced an electrical problem similar to earlier posts with SRS airbag warning light coming on intermitently and losing auto sense wipers and auto head lights refusing to turn off along with seat belt alarm failing.
if its corrosion on termianls they cannot acuse me of leaving the roof down as mine is a coupe. so im hoping its covered under warranty, my dealers been pretty good in that regard
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Old 03-07-2011, 04:42 PM
Aussiegreens Aussiegreens is offline
Registered User
Location: Australia QLD Gold Coast
Join Date: Jan 2011
Posts: 2
Mein Auto: 2008 Z4 Coupe 3.0SI
Well according to the Auto shop it was my ignition switch and that cost $744.25 to check and replace as warranty was up
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Old 03-07-2011, 07:38 PM
droz3 droz3 is offline
Location: Montreal, QC
Join Date: Nov 2006
Posts: 181
Mein Auto: 2001 Z3 / 2006 X3
AC, this may sound stupid but did you try cleaning the male and female contact with some Deoxit electrical contact cleaner ?
If the module has not been damaged by the water but only the contacts are affected, maybe you don't need to replace the module but just clean the contacts.

Z3 2001 3.0L 5-speeds,Topaz Blue/Sport+Premium package/Stong-Strut/Bilstein shocks/Rogue Engineering RSM/Ireland Engineering rear sub-frame bushing/CDV delete/Conforti CAI/Jim Conforti Shark/DRL module/European Wiper Module/Pioneer AVIC-N4 GPS-Receiver+XM Radio+iPod/iPhone interface+Bluetooth+12CD Charger/ASA-AR1 18" wheels+Michelin PSS/Bi-Xenon upgrade.
Latest mod : 3.73 diff. ... WOW
X3 2006 3.0L Automatic, Silver Gray, all original ... so far ...
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Old 07-02-2013, 08:04 PM
bucks73 bucks73 is offline
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Location: NY
Join Date: Jul 2013
Posts: 1
Mein Auto: NY
Rain wreaks havoc on Z4

After looking through multiple forums, it looks like I am the latest victim to fall prey to airbag control unit failure after rain incident.

Shortly after a rain delay at my son's baseball game I realized I had left my 2003 z4 top down.

Symptom #1: Car started up fine but noticed Pass Airbag Off light was on during de home.
Symptom #2: Top down function does not work, SRS airbag light on dash, radio controls work but no volume, turn signals work but indicator does not, and remote intermittently works for locks & trunk.

It appears that I need to replace the airbag control unit located under rear section of the center console. (under coin holder).


1) Any tips on replacing the unit? pictures, procedures, gotchas, etc.
2) Disconnect neg side of batter 1st I assume, correct? Reconnect after airbag control unit replacement.
3) Previous posts indicate that you need to take to BMW dealer to program/clear the airbag indicator. Any workarounds or tips to do it yourself?
4) Tips on where to find quality part for best price?

Note to self:
Do not leave top down in the rain ......

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Old 02-20-2016, 06:40 AM
harmel53 harmel53 is offline
Registered User
Location: Niwot, Colorado
Join Date: Feb 2016
Posts: 11
Mein Auto: 2006 Z4 M-roadster
This sounds like a possible fix for my 2006 M-Roadster. The following items malfunction intermittently with no pattern. The first indication, and only one for a while, was the air bag light coming on. Then it developed the following intermittent failures - directionals, radio volume, radio power, door lock switch, window auto-button, appearance of total dead battery (no lights, no nothin when turn the key - 4 or 5 tries and it works) trunk button, keyless lock or unlock. I just looked up the part number mentioned above on getbmwparts and the discounted price was $680. Any chance you could post the link to the page where you ordered the part?
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