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1999 Boxster Airbag Module - Durametric Software


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Need some help.

 

Looking for some troubleshooting support on a 1999 Boxster equipped with 5 speed, M535 Alarm, M537 Seat Memory, M659 Onboard Computer,  Auto Climate Control.  

 

I replaced the turn signal stalk assembly about a year ago and didn’t get the airbag sensor lead snapped back into place, it bounced off and the airbag light came on a couple of days later.    

 

Finally ordered the Durametric software and it cannot see anything except the ECU and Alarm Control Unit.    I do understand there are two data busses on the car with the  ECU and Alarm unit are on the K1 bus and the other units are on the K2 bus.   

 

I’m not even sure what modules you can even talk to on the 1999.   Anyone have any info about the Instrument Panel, ABS, Airbag, Air Cond, & Seat Memory modules.

 

Short Test Results

Bosch Digital Motor Electronics Motronic 5.2.2

                 No Faults Found

ABS/PSM 5.3

                Blank

Airbag B05

No Faults Found, but light is on

Automatic Air Conditioning H01

                Blank

Alarm I32

                No Faults Found

Seat Memory

                No Faults Found

Instrument Cluster K01-K03

                 No Faults Found

 

When I try to connect to an individual module, only the ECU and Alarm show connections and part numbers, everything else shows it cannot connect…………

Communications Error Unable to connect to this module.
This may not be an indication of a problem if the car is not equiped with this control module.

   

My question is, does anyone have any good troubleshooting ideas?   I have worked in electronics my entire life and know one of the units might be bad and screwing up the bus data.   I’m not sure if they are serial data busses with one unit looping thru the next or all the units just sit on the bus and talk when addressed.  My only thoughts are to pull the other modules  off, except the airbag unit and see what happens..

 

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  • Moderators

Need some help.

 

Looking for some troubleshooting support on a 1999 Boxster equipped with 5 speed, M535 Alarm, M537 Seat Memory, M659 Onboard Computer,  Auto Climate Control.  

 

I replaced the turn signal stalk assembly about a year ago and didn’t get the airbag sensor lead snapped back into place, it bounced off and the airbag light came on a couple of days later.    

 

Finally ordered the Durametric software and it cannot see anything except the ECU and Alarm Control Unit.    I do understand there are two data busses on the car with the  ECU and Alarm unit are on the K1 bus and the other units are on the K2 bus.   

 

I’m not even sure what modules you can even talk to on the 1999.   Anyone have any info about the Instrument Panel, ABS, Airbag, Air Cond, & Seat Memory modules.

 

Short Test Results

Bosch Digital Motor Electronics Motronic 5.2.2

                 No Faults Found

ABS/PSM 5.3

                Blank

Airbag B05

No Faults Found, but light is on

Automatic Air Conditioning H01

                Blank

Alarm I32

                No Faults Found

Seat Memory

                No Faults Found

Instrument Cluster K01-K03

                 No Faults Found

 

When I try to connect to an individual module, only the ECU and Alarm show connections and part numbers, everything else shows it cannot connect…………

Communications Error Unable to connect to this module.

This may not be an indication of a problem if the car is not equiped with this control module.

   

My question is, does anyone have any good troubleshooting ideas?   I have worked in electronics my entire life and know one of the units might be bad and screwing up the bus data.   I’m not sure if they are serial data busses with one unit looping thru the next or all the units just sit on the bus and talk when addressed.  My only thoughts are to pull the other modules  off, except the airbag unit and see what happens..

 

Which Durametric software version do you have?  I sounds like your car has a communications link issue.

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  • Moderators

Anyone have any idea how to test it?

 

Like I said , I am planning on pulling all the modules off except the airbag module and try to talk to it alone on the K2 bus.

 

Any other thoughts?

 

I would consider contacting Durametric and see what they know about it; they get inquiries about issues all the time, so they may have encountered it and have a fix pathway.

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Here is what they said.

We do not have any specific troubleshooting steps to offer other than the following:

 

 - Be sure K-line 2 (OBDII pin 3) is not grounded.

 

 - Be sure K-line 2 does not have battery voltage with key-on

 

 - You might check continuity between pin 3 of the OBDII connector and the appropriate pin of the airbag unit (or another unit on K-line 2).

 

You might try pulling the other modules off the K2 bus; we do not know the possible consequences of doing so.

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Try using the 993 module instead of the 986. It has worked for me but technically speaking it comes with some risks from what I have been told. I have read and cleared codes on my 986 with the 993 module in durametric and the 986 module has never worked for the airbag.

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  • 3 weeks later...

I've got the same problem on my '97 Boxster.  The airbag light came on while driving a few days ago and my Durametric can't see anything but the engine, tiptronic, and alarm system status.  Airbags, ABS, air conditioning, etc return a communications error message instead of status. 

 

Durametric says that the visible modules are on the K-Line 1 bus while those that don't respond are on the K-Line 2 bus.

 

As I've never had reason to look at things on the K-Line 2 bus, I have no way of knowing if the problem is a bus or module failure or if some module or wiring issue is simply blocking bus communications.  I've read that corrosion on various connectors can cause problems with airbag lights but I'm not sure where to start pulling things apart and cleaning them.

 

Does anybody who's had this experience (airbag light on, K-Line 2 bus non-responsive) have any guidance? 

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Latest Update:

 

I gave up on it, for now.  My Porsche dealer is 45 minutes away and they are building a new one 5 minutes from my house, so I am waiting for it to open in March.

 

Here is what I have done so far.

 

Replace the Airbag Control Module, no difference

I am reading a low voltage on the K2 bus lead (Pin 3 on the OBDII connector) 1.2 volts

Disconnected the ABS Controller, no difference & voltage is still there

Disconnected the Air Bag Controller, no difference & voltage is still there

Disconnected the AC Controller, no difference & voltage is still there

Pulled the Seat and disconnected the Seat Controller and that did remove the voltage, but I still cannot talk to the other modules.

Pulled all the connectors and NO Corrosion on any of them, including the Alarm Connectors.

Verified continuity on the K2 bus for the ABS, AC, Air Bag and Seat Modules, I didn't feel like pulling the dash out.

Verified the common ground to all the modules.

 

Durametrics was no help at all, except to tell me to check the continuity of the K2 bus and ground.  They did say I should not have any voltage on Pin 3.

 

Bottom line is I am taking it to the dealer, from what I understand they can do a through diagnostics, something the Durametrics cannot do.

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  • 4 years later...

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