No Speedo, Brake, ABS, DSC lights on - BMW M5 Forum and M6 Forums
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post #1 of 6 Old 20th May 2017, 12:39 AM Thread Starter
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No Speedo, Brake, ABS, DSC lights on

Looking for some diagnostic help on this. Driving to son's lacrosse game I notice the yellow triangle is on indicating DSC is disabled. Thought I might have bumped the button but several cycles and it won't go out. A few minutes later the Brakes and ABS lights turn yellow. I tapped the brakes a few times to make sure they were functioning and the Brake/ABS lights go out, but still have the yellow triangle for the rest of the ride. Steering effort seems heavy as if in Sport mode. Drop him off, turn the car off and then start a few minutes later. No lights, steering is normal. Get out the Peake reader and have the following codes.
84 DSC Message Timeout
86 Instrument Cluster message Timeout
75 Servotronic Speed Signal

Reset the codes.

Start the drive home and all is normal. Going through the Kettle Moraine country so having some fun in the twisties, decide its a good time to bed the brakes and knock the winter rust off. Son loves that, says his eyeballs fall out when I stop. On the fifth bedding stop cycle the lights all come back on, the steering effort increases, and the speedometer drops to zero. GREAT. Keep going, brakes and steering still work. Pull off at Erin Hills where the US Open will be in a few weeks. (Holy cow, what a crazy amount of stuff going on there even this early....) Turn the car off and then on, no joy. Lights on, no speedometer function. Continue drive home, restart car after sitting for few hours, still same. Pull codes, all same plus a couple more.
84 DSC Message Timeout
86 Instrument Cluster message Timeout
75 Servotronic Speed Signal
87 Vehicle Speed Signals (both discrete & CAN)
2A Vehicle Speed input signal, hardwired "A" signal

I've done some googling and all the info I've found is 5-6 years old indicates it is a wheel speed sensor (likely driver's rear due to speedo failure?) or the ABS control unit. Not much info to help determine cause from the Peake codes so I'm hoping someone else has experienced similar codes and solved the problem. I don't have a lot of time to devote to testing or trial and error. Speed sensors aren't that expensive but the rebuilt (or new ) ABS unit is not something I want to mess with without good cause. The 87 and 2A codes give me hope that it is the sensor? Anyone run into this lately? Unfortunately I don't have INPA or anything more sophisticated than the PEAKE reader and I'll chew my arm off before I take it to a dealer.

This thread on another forum has some good info, just haven't had time available to go after it.
Bimmerfest - BMW Forums - View Single Post - 2002 E39 ASC BRAKE ABS lights on => Diagnostic Procedure & Parts Location

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post #2 of 6 Old 20th May 2017, 12:43 AM
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post #3 of 6 Old 20th May 2017, 02:26 AM
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If it's a wheel sensor, usually the error codes indicate that. This may be something more. there is a great thread by Bluebee on the entire wheel sensor thing on bimmerfest. It's old, but the information is still E39-relevant. It will tell you how to diagnose and decide if it is sensors or something at the ABS module.

I had this problem last year on a 528i (E39) but the code pointed to a sensor. Unfortunately, I used a less expensive one to replace all of them, and two have failed this year. I haven't had the speedometer issue - because that's a sensor in the rear and my problems were in the front. I replaced the front right with a BMW sensor and then the left failed. My symptoms were the bifecta (ASC light and ABS light) and the tranny in failsafe mode to where I could only shift manually through the gears.

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post #4 of 6 Old 20th May 2017, 02:30 AM
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Easiest way to diagnose wheel sensors failure in relation to speedo is to swap left and right. If you get your speedo back, it is likely the sensor. Otherwise probably ABS module

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post #5 of 6 Old 20th May 2017, 05:25 AM
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Or it could be the TPM aka RDS aka DRW module. These can be very tricky to sort out, especially if you don't have INPA or ISTA. Swapping left to right in the rear makes sense. If you get the speedo back it's a good chance it's the WSS. If not it could be ABS or RDS. RDS is cheap from Clemster but a pit of a PITA to replace being behind the glovebox. ABS is also relatively cheap from Clemster.
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post #6 of 6 Old 20th May 2017, 04:45 PM
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That is the Bluebee thread start there. You can skip to the high point. Read how to use a tester at the dsc plug, two holes one for the test pin one for the connection, don't use the connection pin. Just test if the wheel speed sensor works. if it does move DSC down on the list.

You are getting a time out for two modules. If they are communicating to the DME and timeout you will get those codes even if they are at fault, but if the timeout is cause by talking to another module only the working modules report the code the unit not working goes un reported. That is what it looks like to me.

The last code in your list is a real code but I have seen it not be real. On my first trip to the east coast I had similar issues, with no tools and no reader, just the few tools in the trunk and the promise of a parts guy that he could not get anything for my car in less than a month.

Not sure my exact order but started by testing the wheel sensor then plugged the DSC back in. Unplugged the Battery and left it over night. Still no go then I thought steering would be simple and not an issue so unplugged it. Went for a drive and decided there was a bit of a difference and did not want to travel back the 1800 km that way unplugged the battery plugged the steering back in. Just before I left to come back to Ontario I though I should see if the car might be safer to drive with the DSC unplugged so did that and drove a few miles, the car was different but can't say how, but I thought I would feel better with that plugged in. I then up graded my CAA to gold to get unlimited towing just in case. Waited the two days for the gold to kick in, jumped in the car to head home made it to the end of the hotel lot and the DSC lights went out pulled on to the highway and watched the speedo rise. Did not want to push my luck so did not push the sport button until I got home. That is when I noticed the button was a bit sticky, coffee spill. I had pushed the buttons multiple times earlier but no Idea when in the order.
I still don't know what caused it and no idea what the codes were, but it has never come back. My sneaky suspicion is it was a half stuck sport button, but that is just an unsubstantiated guess.
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