Trying to read 03 to 06 GM Trucks and SUV air bag SDM Modules thru connector

[SPARTANAUTOWORX]

Trying to clear 2003 -2006 GM Full size trucks and SUVs with the sealed SDM.

I have the pinouts for the sdm and have tried every which way to connect it thru the connector with the car prog. Of course I can read the chip directly with no issues when I cut them open but have come up short with doing it thru the connector.

Anyone know the secret that would be willing to share?

Thanks
:)

[SPARTANAUTOWORX]

I feel after hundreds of attempts to read the chip im doing something wrong with the software.

Current set up on the bench.

carprog

sealed GM SDM Module

Hooked up as follows

12 volts to pin 1 for power
car prog adapter i belive a10 with black wire as k line to the serial data line.
power supply ground.

Using the volt meter i am getting power to the eeprom.

I have tired using the two options in car prog for reading gm air bags and I have also just selected the eeprom and tried to read it manually.

If anyone can check my work i would greatly thank you.

[FxShaw]

So you even have the GM A12 adapter?

[SPARTANAUTOWORX]

So you even have the GM A12 adapter? I do not have the OBD adapter for GM. But I do have all the other car prog adapters.

[FxShaw]

You going to need it. http://www.codecard.lt/carprog/adapters/a-12-gm-airbag-adapter/prod_92.html

[janushaan]

i have that gm adapter but never had success with it,,

[repairmymodule]

The A12 adapter only works for the square GM sealed modules with Motorola 908 MCU. For these to program successfully you must use both serial data lines on module instead of the 1 carprog says.

For most of these modules Pin 1 is 12v+, Pin 32 is Ground, and Pins 22 AND 23 are serial data on the module. So to read these ok you must put pin 2 from the A12 adapter to both pins 22 and 23 on the modules. Ive programmed quite a few and have NEVER got one to even read with just using Pin 22 for serial data. They have all read fine after hooking up Pins 22 and 23 together.

Some GM trucks also use a more rectangular sealed module. These have 95xxx/25xxx eeprom memory and cannot be read through connector with carprog A12

[janushaan]

no wonder i couldnt read any,, and codecard claims can be done through OBD,, ha ha

[KALNAJJAR01]

Hello
4 days ago
used my 12 cable Carprog Pontiac 2005 square sealed module
connect pin 2 to data k line
power
ground
look at Alldata
just clear crash
no need to read
carprog will clear it
any way if you can not do it
tell you customer to buy another good used one from junkyard
simple

[SPARTANAUTOWORX]

Thanks for the replys guys.. :)

So without using the A12 adapter I will never be able to read the module? Correct? Because I have been trying to read with the a10 adapter and every other adapter in the box. lol

If the A12 adapter is what I need I will order it today.

Thanks again for the help everyone. :)

[janushaan]

so far i havent had success reading these module with A12,, maybe i am doing it wrong,, you can try buying it,,

[SPARTANAUTOWORX]

Update

Received my A12 adapter the other day. Today I hooked up a sdm from a 2003 chevy silverado 1500

PN 15192446

Got on all data

Put power to pin one (yellow wire)
Ground to black wire pin 32
Serial data was pin 32 dark blue
pin 33 is empty in my connector

I hoooked up power and ground to my desktop power supply
I hooked pin 32 to pin 2 of the A12 adapter (top left)

Still cant get it to read. Any thing im missing?

Thanks

[repairmymodule]

On this module pin #1 is 12v+........Pin 22 & 23 is serial data..........Pin 32 is ground

So pin 1 from module goes to pin 16 of A12, pin 32 of module goes to pin 4 of A12, and pin 22 & 23 of module goes to pin 2 of A12.

It is important to put both serial data lines from module to pin 2 of A12 adapter. i have never gotten one to read by only using pin 22 for data.


Good Luck

[lwood]

On this module pin #1 is 12v+........Pin 22 & 23 is serial data..........Pin 32 is ground

So pin 1 from module goes to pin 16 of A12, pin 32 of module goes to pin 4 of A12, and pin 22 & 23 of module goes to pin 2 of A12.

It is important to put both serial data lines from module to pin 2 of A12 adapter. i have never gotten one to read by only using pin 22 for data.


Good Luck

i believe A12 adpater i have is defect. i try connecting to the two data pins.. i have try it on 5 different modules.. none work for me.. have to open to read 908 inside.

[SPARTANAUTOWORX]

On this module pin #1 is 12v+........Pin 22 & 23 is serial data..........Pin 32 is ground

So pin 1 from module goes to pin 16 of A12, pin 32 of module goes to pin 4 of A12, and pin 22 & 23 of module goes to pin 2 of A12.

It is important to put both serial data lines from module to pin 2 of A12 adapter. i have never gotten one to read by only using pin 22 for data.


Good Luck


OK so here is my bench setup.

Also not pictured I have added a wire for pin23 which is empty in the two modules im working with.

I tried both 22 / 22+23 with power going to the module and nothing reads.

Im sure im missing something so im attaching the picture.345577

[rrador]

I can almost never read these modules...only some older ones work sometimes.

[rrador]

On this module pin #1 is 12v+........Pin 22 & 23 is serial data..........Pin 32 is ground

So pin 1 from module goes to pin 16 of A12, pin 32 of module goes to pin 4 of A12, and pin 22 & 23 of module goes to pin 2 of A12.

It is important to put both serial data lines from module to pin 2 of A12 adapter. i have never gotten one to read by only using pin 22 for data.


Good Luck

I will try this next time...but I just looked some wiring diagrams and none of them show 2 data lines pin 23 is usually empty

[repairmymodule]

Yeah the car doesn't use pin 23 but internally it is a serial data line.

I cant see pin 2 on the A12 dlc connector in your photo.

Also. You must usually manually select chip in settings. Try both. Sometimes try to read fault codes first.

When it errors out, does it say cannot connect or does it say something about waiting a few seconds and retry?

[SPARTANAUTOWORX]

Yeah the car doesn't use pin 23 but internally it is a serial data line.

I cant see pin 2 on the A12 dlc connector in your photo.

Also. You must usually manually select chip in settings. Try both. Sometimes try to read fault codes first.

When it errors out, does it say cannot connect or does it say something about waiting a few seconds and retry?


I will get some very detailed pics from how im reading it later today.

Thanks again for the help. :)

[janushaan]

The A12 adapter only works for the square GM sealed modules with Motorola 908 MCU. For these to program successfully you must use both serial data lines on module instead of the 1 carprog says.

For most of these modules Pin 1 is 12v+, Pin 32 is Ground, and Pins 22 AND 23 are serial data on the module. So to read these ok you must put pin 2 from the A12 adapter to both pins 22 and 23 on the modules. Ive programmed quite a few and have NEVER got one to even read with just using Pin 22 for serial data. They have all read fine after hooking up Pins 22 and 23 together.

Some GM trucks also use a more rectangular sealed module. These have 95xxx/25xxx eeprom memory and cannot be read through connector with carprog A12

as able to read it first time,, ha ha thanx to repairmymodule

[SPARTANAUTOWORX]

346166346167346168346169
So here is some better pics of my setup. I have confirmed 12volts going to the module from my outside power supply.

I have tried two different pins in the a12 as you can see in the pics.

I added a wire for the other pin in my plug and tied them together.

I have used the air bag direct , GMv04 and by eeprom using the 160 chip.

All yield no reads from the device.

[FxShaw]

Did one yesterday http://images.tapatalk-cdn.com/15/12/10/e70b36cb2c1533866ef2359cac68806f.jpg

[SPARTANAUTOWORX]

346224
So i connected it to the truck via the port and it will read the codes. Of course it wont clear it but it will communicate with it. So back to the bench I went and im still getting no com with the module. No response from unit using the GM v0.4 option

[FxShaw]

So i connected it to the truck via the port and it will read the codes. Of course it wont clear it but it will communicate with it. So back to the bench I went and im still getting no com with the module. No response from unit using the GM v0.4 option


Exactly what year and model and module part # you trying to clear btw?

I am not sure why some of you having so much issue with these...I never once had any issue with any of them..

[repairmymodule]

Ok now I see pin 2 on your DLC plug from the A12. But I do not see ground hooked up to pin 4 or 12v+ on pin 16 of the A12.

[janushaan]

best way to do it buy male DLC. or goto junkyard cut one out plug that into A12,, easy to connect wires,, that is what i did alligator clips aren't the best for this kinda work

[SPARTANAUTOWORX]

I have a ton of trucks that I can cut a obd plug from. Im going to go do that right now and report back. :)

[SPARTANAUTOWORX]

346358346359

Still says no response from ECU.

Module is from a 2003 Suburban 1500

[SPARTANAUTOWORX]

Pinouts listed below.

Pin 1 12+

Pin 22 serial data
pin23 was empty but I added a wire so I am also connecting pin 22/23 together. A few people posted this was necessary for a good read.

pin 32 is ground

pin 11 is low reference which I have also grounded a few times in attempt to get it to read. Normally I leave this one unhooked.


346363346365346362346364

[FxShaw]

If you can communicate with it on the truck and not on bench with CP, then you know that you are doing something wrong...Take yr time and check back ever thing...


BTW you should be able to clear it on the truck...put it back in the truck and press clear crash...if i recall correctly...once i had to press clear crash like 2-3 times before it actually work on vehicle..ever time you fail, turn ign off and back on...but they should be no reason you cant clear it on the truck.

[SPARTANAUTOWORX]

I think you can only clear the 908 MCU in the 99-02 trucks. Im not 100% but I think this is the 95160 chipset which cant not be done using the a12.

346389

[SPARTANAUTOWORX]

ok finally got it to read on the bench. Cleared using the auto function multiple times and still has the command deployed for air bags.

Figured out how to pull the code if anyone could take a look at it. Not sure what needs to be changed since I do not have a clean 03 module to compare to.

[SPARTANAUTOWORX]

Had to manually set my read to whats pictured below. Not sure if that setting is correct. I believe the crash lies in the first 02 to line 080.

346411

[FxShaw]

Issue Fixed.

[SPARTANAUTOWORX]

thanks trying now

[SPARTANAUTOWORX]

Installed and threw a B1000 code electronic control unit malfunction

did a reset with my handheld scan tool and so far no light. :)

Thanks for all the help everyone.

Now to tackle the three other trucks I have built that have all had crashed modules with lights on for the last 2 to 3 years. lol:bounce: