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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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  #1  
Old 04-19-2011, 11:29 AM
dansr dansr is offline
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Mein Auto: 2002 540i Sport 6Spd
No your usual air bag codes

Hey guys and gals,

Need some help with troubleshooting air bag codes.

Got the dreaded air bag light on my wife's 02 325i, just in time for a state safety inspection, of course . Pulled the codes with a BavAuto reader and reset. The light comes back on after about 3 seconds. The codes at first were 04 08 50, table 04, code 08 = Firing circuit, side airbag, rear right side and table 04, code 50 = supply voltage. I disconnect battery, remove door and such check the circuit condition with a meter through the plug, all seems good. Reconnect, recheck the codes. Now, I get a table 04, code 08.

I was hoping it was the front passenger airbag, as there are a lot of threads on that. Haven't found anything through the search forum function nor google on these codes or the side rear airbags. Bentley's hasn't been that helpful either.

Is there measurable current on the airbag circuit that I can look for? Is there a way to further isolate this? Any thoughts on where to look next?

Many thanx in advance,
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2002 540i 6 spd, Sports Pkg
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  #2  
Old 04-19-2011, 02:38 PM
dansr dansr is offline
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Location: NOVA
 
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Mein Auto: 2002 540i Sport 6Spd
Not your usual airbag codes

Could really use some help, cause I suck at electrical troubleshooting.

Any ideas on how to isolate the problem?
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Dan
Northern Virginia
--
Former Volvo Enthusiast

2002 540i 6 spd, Sports Pkg
Mods so far:
Redline MTL in tranny | Redline 75W90 in diff |
05/545i short shifter | Weighted selector rod |
CDV Delete | Zionsville Cooling Solution
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  #3  
Old 04-20-2011, 01:59 PM
jcjdavis1 jcjdavis1 is offline
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Hi. Try this- http://cgi.ebay.com/ebaymotors/BMW-E...Q5fAccessories Jim
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  #4  
Old 10-04-2011, 07:18 AM
dansr dansr is offline
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Looking back I realized I never closed the loop on this airbag code issue. So, here's the re-cap:

Turns out that the ECU was programmed with the rear airbags disconnected. When the PO had the window regulator replaced the mechanic connected the airbag during reassembly. DOH! I disconnected the airbag, reset the codes and "Boom Baby!" No code!

Hope that helps someone in the future.

Cheers,
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Dan
Northern Virginia
--
Former Volvo Enthusiast

2002 540i 6 spd, Sports Pkg
Mods so far:
Redline MTL in tranny | Redline 75W90 in diff |
05/545i short shifter | Weighted selector rod |
CDV Delete | Zionsville Cooling Solution
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  #5  
Old 10-04-2011, 10:21 AM
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bluebee bluebee is online now
Seek to understand,^Value
Location: San Jose, California
 
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Mein Auto: 02 BMW 525i M54 automatic
Quote:
Originally Posted by dansr View Post
the ECU was programmed with the rear airbags disconnected. When the PO had the window regulator replaced the mechanic connected the airbag during reassembly.
I'm confused.

Do you mean 'programmed' (which means updating to a newer software release, in toto) or 'coded' (which means setting/resetting specific available options in a module)?

Either way, do I understand correctly the (strange) sequence of events?
  1. Presumably, at time zero
    • the airbag light was off;
    • the airbags were working;
    • and the ECU was properly 'programmed'
  2. Then, at some point in time, the PO had the window regulator fixed
    • The mechanic either disconnected or reconnected the yellow airbag connector with the battery cables connected
    • This caused (predictably) an airbag warning light on the cluster
  3. Later, instead of simply clearing the airbag light, the PO (apparently)
    • Had the ECU re-programmed with new software updates
  4. Somehow, this re-programming 'accepted' the fact that the airbag warning was lit, and, it somehow decided 'not' to show the warning anymore.
  5. Then, the OP bought the vehicle
  6. Unbeknownst to him, the ECU was ignoring the airbag light warning
  7. Then, for some strange reason, just before inspection, the ECU decided to honor the airbag warning
    • This apparently lit the warning on the cluster
  8. When the OP performed a normal airbag reset, the codes remained
  9. But, when the OP disconnected the airbag, and 'then' did a normal reset, the codes were cleared.
I don't profess to understand how some of these steps could possibly occur ... but that must just mean that I didn't understand the sequence of events.

For those who did accurately understand the logical sequence of events ... would you kindly summarize so that the sequence makes sense logically?
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