DSC light & codes

[bear2020]

Trying to get this Z3 finished and every step of the way its biting me in the a**e! 2000 3.0

I have the DSC light on, no ABS
Plugged in C110+ and came up with these faults
1A seat occupancy recognition 1 (SBE1) I assume this is the mat sensor?
11 Power supply
F0 Internal control unit fault
0B Battery positive terminal isolation 1

I've cleared the codes and all came back
Not sure where to start any advice?
Thanks

 

[bear2020]

Well the saga continues I can't get the C110+ to read anything from the chassis (ABS) no matter what I do
Found fuse 42 (Airbag 5A) had been removed by previous owner. Replaced that and was expecting an ABS light to come up on the dash but nothing.
Can't get a reading from scanner to check wheel speed sensors and did try to check with multimeter but 3 pins and a PITA to try and do.

Anyone had this problem before?

Battery is all good as well and reading 12.8v today

I was also expecting to find the ABS relays in the fusebox but not there and can't find anything on google about their location. Anyone know?
Cheers

 

[NZ00Z3]

The codes you listed in the first post are from the air bag module. You have the F0 code (no, I'm not telling you to have sex and travel). This tells you that the module needs to be repaired or replaced. See this thread. https://www.bimmerforums.com/forum/...nal-Error-(F0-240-errors)-Finally-found-a-fix!

Sometimes a faulty module on the communications bus will block you from being able to read other modules. As you can read the air bag module, it may not be the cause of not reading the ABS module. Since the air bag module has to be pulled out anyway, remove it and see if you can then read the ABS module.

I've been through the wiring diagrams for the 2000 Z3 with DSC. There are 2 versions the DSCIII and the DSC MK60. Neither versions have an ABS relay. Are you looking at the correct set of wiring diagrams for your car's build date? There are 6 sets of diagrams that cover the production run of the Z3. In the bottom right corner of the front page is where the build date range is located. Get your wiring diagrams from the "Resources" Section of this forum (in the blue ribbon on the top of your screen). They are in page 2.

 

[bear2020]

The codes you listed in the first post are from the air bag module. You have the F0 code (no, I'm not telling you to have sex and travel). This tells you that the module needs to be repaired or replaced. See this thread. https://www.bimmerforums.com/forum/...nal-Error-(F0-240-errors)-Finally-found-a-fix!

Sometimes a faulty module on the communications bus will block you from being able to read other modules. As you can read the air bag module, it may not be the cause of not reading the ABS module. Since the air bag module has to be pulled out anyway, remove it and see if you can then read the ABS module.

I've been through the wiring diagrams for the 2000 Z3 with DSC. There are 2 versions the DSCIII and the DSC MK60. Neither versions have an ABS relay. Are you looking at the correct set of wiring diagrams for your car's build date? There are 6 sets of diagrams that cover the production run of the Z3. In the bottom right corner of the front page is where the build date range is located. Get your wiring diagrams from the "Resources" Section of this forum (in the blue ribbon on the top of your screen). They are in page 2.

Thanks for the info

From what i have read and don't understand is the ABS light comes on and then goes off when the car is started. I can feel it working if I break hard. Its the DSC light that is on and can't get it to go off. I would have thought the ABS light would have been staying on as well. Its driving me mad!

 

[NZ00Z3]

Yes the ABS and DSC lights come on when you turn on the ignition, then go out. That's normal. It tells the driver (and MOT inspector) that the systems are turning on and the light going out says that there are no problems with these critical safety systems.

The usual trifecta of lights are the ABS, DSC/ASC and brake lights. The ABS and DSC/ASC systems are both controlled out of the ABS module. As you only have the DSC light up, the problem will likely be something that is just specific to the DSC system. If I was to guess, it would be either the lateral accelerator sensor (yaw rate sensor) (expensive new) or the steering angle sensor (pain in the A to change). Both will pop a code if they are faulty.

Until you get to communicate with the ABS module to see the codes, we are all just guessing.

 

[bear2020]

NZ00Z3 thanks for the info I'll print of the schematics and start going through it all and see what the problem is
Funny thing is my dad has a X3 and has an airbag light on
Sisters 1 series as all 3 lights on
Her partner his 3 series as DSC light on and I have the Z3
I'm yet to have any other car where the air bag or traction control fails and I have had a lot of cars!
Seems to be a sensitive thing on the BMW's

 

[bear2020]

From what I can gather it could be any of the following
Yaw sensor
Lateral Sensor
Steering column angle sensor
DSC module
ABS sensor
Steering wheel sensors
Wiring

Is there anything else it might be !?!
Is there anyway of checking these things without buying new parts (testing with a multimeter) Have seen wheel sensors can be done measuring the ohms but conflicting advice on that with some saying its not the correct way of doing it.

So far checked the DSC switch and unplugged the DSC electrical connections. Tomo going to take both the seats out, centre console and check those items and at least get the part numbers off.

Getting to the stage I wish I broke the car for bits but 2k in she still won't play ball, especially when you see other 3.0 z3 going for 5k with same mileage as mine and knowing what I have put into this

Hope the missus doesn't check the bank account any time soon

 

[bear2020]

I bought a cable and downloaded INPA and have re-read the car

68 Tank ventilation (not too worried about this at the mo)
122 Temp sensor oil (Reads 144.63C without engine running!)

Chassis
180 Steering wheel angle sensor. I can clear this, turn the wheels and it does not come back on. However press the DSC switch and it comes back on
I did have another reading saying another fault and put speed at 20km/h but this seems to have been an old fault

Airbag
11 Ignition circuit ZK10 Battery unplug
240 Internal ECU error
17 Supply Voltage
26 Seat Occupied Recognition (SBE1)

Looking at this I think the first action would be to get the airbag ecu out and replace that and then see what codes come back? Code 240 appears to be pretty terminal from what I have read :-(

It just seems strange that no ABS light has come on though only the DSC. Can't get my head around why it would not show an ABS fault?

 

[NZ00Z3]

Yes, airbag fault 240 is a big problem. Either send the unit to the USA to be reset (as per the thread I linked) or buy a replacement. The replacement will need to be coded to your car.

You are only getting the DSC light up because the steering angle sensor is only for the DSC function. It has nothing to do with the ABS functions.

In INPA you can see the signal from the steering angle sensor. I think it's in the ABS/DSC section. Check to see that it's zero with the wheels straight and that it gives sensible readings when you turn the wheels left and right.

In section D, 3, in the first post of the below thread, you will find the instructions on how to calibrate the steering angle sensor. If it's still giving you problems, then give this a go. The steering angle sensor is a pain to change, so good luck in getting it working again.

The Z3 Diagnostics Thread: Instructions, Experiences, Discussions, Experimentation

Bimmerforums is the preferred online BMW Forum and community for BMW owners. At Bimmerforums, you will find technical how-to information maintenance specifics audio advice wheel and tire combinations and model specific details not found anywhere else. Our professionals are here to help make...

www.bimmerforums.com

 

[bear2020]

Thanks for the reply

I have already done everything in the link you attached yesterday. Steering is off by 6deg so will be recalibrating that later today in the hope it sorts that out. Oddly enough have to view it on INPA as E46 DSC I guess another borrowed part!

I've tested the ABS module all good on that front which makes me believe it is the ECU

I've contacted a company in the UK to see if they can reset it as it normally costs about £60

Hopefully start getting to the bottom of it now - thanks for the advice!

 

[bear2020]

SUCCESS!!!
Unable to recalibrate in INPA so had a read up about Tool 32 and played around with that.

Mine was showing a Steering angle of -29.27

Following
https://www.bimmerforums.com/forum/...sions-Experimentation&p=29482533#post29482533 I managed to reset the DSC so the light now goes on & off

So now its just sorting out the ABS ECU and she is back on track for the rebuild but currently dashboard is light free!

 

[NZ00Z3]

Excellent news. Well done.