2003 R53 airbag control module issue - Bimmerfest - BMW Forums

Go Back   Bimmerfest - BMW Forums > The Best of Bimmerfest! > The MINI Board

The MINI Board
The Mini Cooper Forum

Thread Tools Display Modes
Old 03-30-2020, 09:02 PM
nated2755 nated2755 is offline
Registered User
Join Date: Mar 2020
Posts: 1
Mein Auto:
2003 R53 airbag control module issue

Hello all,

I'm having an issue with my airbag light on my mini cooper s. I'm getting fault codes:

90 MRSZ5 airbag control unit faulty (alive counter, K bus message 70H)
91 K bus: communication between MRS4/MRS5 and instrument cluster faulty.

I replaced the airbag control module with one from the scrap yard but am still getting the same error.

I checked power to the module, and am getting apprx 12 volts, as well as checking continuity on the K-bus line from the airbag module to the instrument cluster with no apparent issue there.

I've tried to research as best as I can and only found 1 other post regarding the 91 error involving an icelink controller that they had plugged into the stereo which was causing voltage drop on the K bus wire, but when I check voltage, I'm getting 12 volts (just for clarification I don't have an icelink, but there is an aftermarket stereo that I wanted to rule out).

Not sure where to go from here. I don't have any real history on the vehicle as I just recently purchased it. There is one other error which is error code 50 "vehicle identification in ZKE and instrumentation is different", but from what I've found online shouldn't cause an issue with the airbag module. I'm thinking there could be an issue with the instrument cluster, but I don't have any other symptoms, and unless the used airbag module has the exact same fault I'm thinking its possibly a wiring issue, but I don't know what else to test. Another thought is one of the sensors plugged into the module is causing some kind of interference with the modules ability to communicate with the instrument panel, but I don't know if that is possible

Thank you for taking the time to read, and any input would be greatly appreciated.
Reply With Quote

See More Related BMW Stories

Forum Navigation
Go Back   Bimmerfest - BMW Forums > The Best of Bimmerfest! > The MINI Board
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 04:04 AM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
© 2001- VerticalScope Inc. All rights reserved.