DSC, ABS, and brake light on highway

[Riggodeaux]

Actually, on retest at the Interstate shop, the battery showed 759 cca and 12.43v on the meter [18 months in to the 30 month free replacement warranty]. Operator error on the multimeter at my local O'Reillys on the earlier test [it pays to doublecheck these guys; I suspect the machines are pre-set to say 'bad battery' to motivate sales .....]. I replaced the gear in the transfer case actuator yesterday afternoon and no more 'trifecta' with that and my having replaced my alternator with a Bosch rebuild from autohausaz ....

[Ricky Bobby]

Naz, you can mark the thread title as fixed and I am bumping it to help out others.

Long story short, use DIS scan tool. In the last 2 years the intermittent trifecta which would come on, and reset at the next drive cycle was cumbersome but didn't really effect me. About a month ago I wanted it gone for good.

I sent my ABS module for a rebuild (prevenatively and I thought it might be my issue) and after receiving back I had received 2 random trifectas since then. So I hooked up DIS. THE ONLY CODE I HAD ON MY ABS MODULE was 2 codes for Brake Light Switch.

Bought a new one from the dealer, installed on Saturday morning 2 weeks ago and installed. Has not been back since.

In my case the trifecta was a Brake Light Switch ($33) from BMW needing replaced.

[cielo]

Hi guys. Read through this thread and others in relation to my '04 4.8is w/80k.

The trifecta came on after replacing my battery (always on, never intermittent). I never heard any clicking or noticed any effect on drivability. Indy rebuilt actuator and replaced/programmed transfer case module which cleared some related codes but their scan still shows fault to transfer case. Any possibility the transfer case is not the issue? Could it be the DSC/ABS control module or a sensor?

[Ricky Bobby]

What does the fault say? Have you reset the transfer case adaptations or done a fluid change?

[cielo]

Originally Posted by Ricky Bobby

What does the fault say? Have you reset the transfer case adaptations or done a fluid change?

Thanks for the response. I'll have to get the fault from the shop; I think they performed a reset though I'll verify. Fluid was changed around around 72k.

[Ricky Bobby]

Adaptations need to be reset at the time of fluid change on Xdrive models in case you didnt know or didnt have it done

[cielo]

Originally Posted by Ricky Bobby

Adaptations need to be reset at the time of fluid change on Xdrive models in case you didnt know or didnt have it done

Thanks. I'm sure they would have done adaptations as they are an experienced BMW indy. Plan to talk to them again today.

[jac]

Originally Posted by Ricky Bobby

Naz, you can mark the thread title as fixed and I am bumping it to help out others.

Long story short, use DIS scan tool. In the last 2 years the intermittent trifecta which would come on, and reset at the next drive cycle was cumbersome but didn't really effect me. About a month ago I wanted it gone for good.

I sent my ABS module for a rebuild (prevenatively and I thought it might be my issue) and after receiving back I had received 2 random trifectas since then. So I hooked up DIS. THE ONLY CODE I HAD ON MY ABS MODULE was 2 codes for Brake Light Switch.

Bought a new one from the dealer, installed on Saturday morning 2 weeks ago and installed. Has not been back since.

In my case the trifecta was a Brake Light Switch ($33) from BMW needing replaced.

$33 switch... Wow

Thanks for the update! I am debugging the trifecta on mine right now with the guidance of some really cool folks on this forum.

[Ricky Bobby]

Its definitely something needing the BMW software to diagnose and fix properly.

[Ricky Bobby]

I should have had thread title fixed.

My problems were solved by replacing the $28 Brake Light Switch behind the brake pedal as that was the recurring code that came back. If you only have a 5A code - I would be thinking to rebuild the module (I also did that prior to replacing the brake light switch)