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mpgscott

Adaptive cruise issue

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I’ve noticed that the adaptive cruise on my 2005 535d randomly cuts out, I’ve checked that the sensor is clear and I’m not getting any faults.  When working it works fine will hold you off the car in front as it should.  Braking works function all works, there doesn’t seem to be any pattern to when it stops.  I can understand when say you get snow or something obscuring the sensor but most times it’s clear.

 

When it switches off then it will come back on its own without stopping or switching off.

 

Is there a recalibration that I can run from ista?  Had a search on here and online couldn’t find anything, so as usual any thoughts much appreciated.

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5 minutes ago, Biotoxic said:

Try updating module/s with Istap. Sounds like a software glitch or maybe a bad cable connection. 

Cheers, I’ve never dabbled in the ista-p software my current comfort is in using ista-d :-)

 

Will take a look into it though, as all the modules haven’t been updated since 2009!

 

Thanks anyway..

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8 minutes ago, mpgscott said:

Cheers, I’ve never dabbled in the ista-p software my current comfort is in using ista-d :-)

 

 

It takes much longer to load but make sure the cas and lma  VO matches both modules as Istap is reading from the light module.   Make sure voltage does drop bellow 13v, lights off, seatbelt fastened... 

 

Did you had a ACC fitted from the factory or it was retrofitted? 

I think I've seen a recalibration option in ista as well, it was under service functions I think. 

Edited by Biotoxic

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10 hours ago, Biotoxic said:

 

It takes much longer to load but make sure the cas and lma  VO matches both modules as Istap is reading from the light module.   Make sure voltage does drop bellow 13v, lights off, seatbelt fastened... 

 

Did you had a ACC fitted from the factory or it was retrofitted? 

I think I've seen a recalibration option in ista as well, it was under service functions I think. 

I thought the LMA was the backup and it's read from the CAS, and the calibration need some specialist equipment the dealers have to set it up. A right faff!

What's the condition of the lens as years of stone chips scatters the beam until eventually it stops working.

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Thanks guys, the system was fitted from factory when new 2005.

 

The lens does look to have a couple of stone chips nothing major but probably doesnt take much to effect them i would imagine.  Added a couple of images when you zoom in its like a golf ball with little concave sections that make it up.

 

I would imagine the calibration will need to work through different scenarios, i will take a read of what ISTA tells me about it without actually running it.

 

 

WhatsApp Image 2021-01-12 at 10.26.29 AM (1).jpeg

WhatsApp Image 2021-01-12 at 10.26.29 AM.jpeg

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That lens is dulled m8, it should be shiny when new so I expect that is why you're having the odd issue. You can't polish them up either so don't try that as it will never work again.

I think calibration requires some special items.

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2 minutes ago, GoNz0 said:

That lens is dulled m8, it should be shiny when new so I expect that is why you're having the odd issue. You can't polish them up either so don't try that as it will never work again.

I think calibration requires some special items.

Its pretty impressive that it still works at all after nearly 16yrs on the road.  I can keep an eye out for a sensor, but was looking at the calibration instructions on ISTA and its a lot of kit thats required to calibrate.  Think taking it to BMW would be more than the value of the car to calibrate :-)

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3 minutes ago, mpgscott said:

Its pretty impressive that it still works at all after nearly 16yrs on the road.  I can keep an eye out for a sensor, but was looking at the calibration instructions on ISTA and its a lot of kit thats required to calibrate.  Think taking it to BMW would be more than the value of the car to calibrate :-)

Yep and most used sensors will be in the same state m8, new one is about £1600 I think + calibration and fitting.

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16 minutes ago, GoNz0 said:

Yep and most used sensors will be in the same state m8, new one is about £1600 I think + calibration and fitting.

Ouch!

 

I must look into it and see if when it eventually fails if i can simply disable the ACC and have normal CC.

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On 12/01/2021 at 10:11, GoNz0 said:

thought the LMA was the backup and it's read from the CAS, and the calibration need some specialist equipment the dealers have to set it up.

It does it in NCS, winkfp. There is no difference as I could tell when you code as you only getting a vehicle info from cas or LMA. Tried reading from Cas then coding, then reading from LMA same thing... Sometimes I've seen the coding not saved when read again from LMA if  cas was coded previously but as I found out It's much faster if I put the car to sleep after coding the module. Then when read from the other module it already shows up. Hard to explain.... 

 

Is I read it, specialist tools are needed when it's being retrofitted or there's was a damage to the bumper. Most likely it needs to be re initialised like a rls when the windscreen is changed... If there is error code stored Ista should offer a procedure to do that. 

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22 minutes ago, Biotoxic said:

It does it in NCS, winkfp. There is no difference as I could tell when you code as you only getting a vehicle info from cas or LMA. Tried reading from Cas then coding, then reading from LMA same thing... Sometimes I've seen the coding not saved when read again from LMA if  cas was coded previously but as I found out It's much faster if I put the car to sleep after coding the module. Then when read from the other module it already shows up. Hard to explain.... 

 

Is I read it, specialist tools are needed when it's being retrofitted or there's was a damage to the bumper. Most likely it needs to be re initialised like a rls when the windscreen is changed... If there is error code stored Ista should offer a procedure to do that. 

Thanks Bio, no i dont have any error codes in ISTA.  Cant see any means of how to re-initialise in ISTA will have to take more indepth look.

 

Out of interest when your coding what power source do you use on the car to avoid battery issues?

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31 minutes ago, mpgscott said:

Thanks Bio, no i dont have any error codes in ISTA.  Cant see any means of how to re-initialise in ISTA will have to take more indepth look.

 

Out of interest when your coding what power source do you use on the car to avoid battery issues?

I made my own from a guide on the RC forums for a LIPO homemade charger, I have a pair of 90a server PSU's with a variable resistor mod so I can up the voltage to 15v

I only really use this when working on cars for a long time or updating modules most things you can get away with the engine running, especially for coding.

57 minutes ago, Biotoxic said:

It does it in NCS, winkfp. There is no difference as I could tell when you code as you only getting a vehicle info from cas or LMA. Tried reading from Cas then coding, then reading from LMA same thing... Sometimes I've seen the coding not saved when read again from LMA if  cas was coded previously but as I found out It's much faster if I put the car to sleep after coding the module. Then when read from the other module it already shows up. Hard to explain.... 

 

Yep the LMA has been the fix a few times when people have messed up changing the FA, load that and write back to CAS and problem solved.

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18 minutes ago, GoNz0 said:

I made my own from a guide on the RC forums for a LIPO homemade charger, I have a pair of 90a server PSU's with a variable resistor mod so I can up the voltage to 15v

I only really use this when working on cars for a long time or updating modules most things you can get away with the engine running, especially for coding.

 

Yep the LMA has been the fix a few times when people have messed up changing the FA, load that and write back to CAS and problem solved.

Many thanks Gonzo, will look at what i can make up.  Have a few PSU's from our old servers at work so can possibly conjure something up.  So coding with engine running tends not to be a problem, so majority of time the system after coding doesnt power cycle the modules?

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6 minutes ago, Biotoxic said:

anything beside the CAS and DDE/DME(for lci) EGS(gearbox)  can be coded with engine running. Will look into the psu thing if I can't get my mst 80 fixes... Cheers. 

Good to know guys.  I must find out more on the coding front.  Is it possible to code out the EGR or does this require specialist equipment?  I will start another thread asking the question of the coding guru's.  Given the cheapest im being quoted to do this is around £180 plus travel whenever that will be allowed i might invest in finding kit and doing it myself.

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