Light issue

carnau · November 29, 2017

It's almost like the drivers door module is going to sleep but none of the drivers door inputs are waking it up. It takes any other form of communication to wake it up. At this point I am leaning towards a bad DDM or BCM. If you checked all the door jamb wiring and everything tests good. That's where I would go. I would get a DDM from a junk yard that way you don't have to have it programmed. The DDM is part of the window switch assembly itself. I could have got some rain or water damage possibly as well.

inline · November 29, 2017

I'm guessing yes but better ask, is the bcm RPO specific? Need dealer programming?

I'll try to find a ddm.

Thanks

inline · November 30, 2017

Kinda thinking things over. If there's power to the DDM fuse, while the driver door module is in dormant mode aka nothing works, then that would isolate the driver door as being the problem, correct? As the fuse box is after the BCM, and both doors modules, use the same power source? Am I close? Ha

What part of the DDM would have the ability to time out, if faulty?

Just curious. I like to overthink things, sometimes I accidently learn something by doing so. Lol

carnau · November 30, 2017

1 hour ago, inline said:

Kinda thinking things over. If there's power to the DDM fuse, while the driver door module is in dormant mode aka nothing works, then that would isolate the driver door as being the problem, correct? As the fuse box is after the BCM, and both doors modules, use the same power source? Am I close? Ha

What part of the DDM would have the ability to time out, if faulty?

Just curious. I like to overthink things, sometimes I accidently learn something by doing so. Lol

The door module is on the bus which means it has to go into sleep mode or it would kill your battery. It definitely could be the DDM.

tramz · November 30, 2017

I had the same issue and thought it was a wiring issue. Turned out when I replaced my latch/lock actuator assembly my dome light functions with door again.

inline · November 30, 2017

You were having problems with the power lock/mirrors working as well?

inline · November 30, 2017

After doing some more searching, may have stumbled across a simple but clever way to troubleshoot the DDM....swap it with the PDM...see if normal operation returns.

inline · December 1, 2017

What began as a good idea, ended up being nothing more than that.

Pulled the DDM and PDM, PDM accepted the DDM connectors no problem.

But nothing happened, pushing lock or window buttons, amounted to clicking inside the module but non functional. Key on, same result.

Put the DDM on the passenger door, same results, clicking inside the module but non functional.

Put modules back in their respective door and I'm back to where I started.

I want to believe it's a bad DDM but what's holding me back, is the fact everything becomes functional, once key is on or dome light manually turned on, among other things, things that based on what I've read, wake up the BCM from low power mode and have nothing to do with waking a DDM up.

Tried reading as much as possible and apply logic to the situation but seems a trip to the dealer is inevitable, unless someone has a way to test the components in question via old school approach. Lol

carnau · December 1, 2017

4 hours ago, inline said:

What began as a good idea, ended up being nothing more than that.

Pulled the DDM and PDM, PDM accepted the DDM connectors no problem.

But nothing happened, pushing lock or window buttons, amounted to clicking inside the module but non functional. Key on, same result.

Put the DDM on the passenger door, same results, clicking inside the module but non functional.

Put modules back in their respective door and I'm back to where I started.

I want to believe it's a bad DDM but what's holding me back, is the fact everything becomes functional, once key is on or dome light manually turned on, among other things, things that based on what I've read, wake up the BCM from low power mode and have nothing to do with waking a DDM up.

Tried reading as much as possible and apply logic to the situation but seems a trip to the dealer is inevitable, unless someone has a way to test the components in question via old school approach. Lol

Do you have a pick and pull junk yard near you? You could always take one off and ask them if you could try it before you buy it. I am sure they wouldn't mind.

I will be gone till Tuesday. Don't think I am ignoring you, I will help you when I get back from vacation if you're still having problems.

inline · December 1, 2017

No pick and pull.

Gm dealer is usually helpful but I just haven't had a chance to stop by.

I usually get the problem isolated then order from car-part, but this one has me puzzled.

Based on what I read and seen on the YouTube, switching PDM and DDM, should have worked but it didn't...created more questions than answers.lol

I do appreciate your help carnau, enjoy your vacation.

inline · December 29, 2017

Carnau

Due to holidays and weather, haven't put much thought into my trucks issue but this evening, noticed the interior light was coming on when the door opened.....so for now it works. Been having issue with the tach, reads way off, like a thousand too low when I first start truck but if I stop and restart, after that, it works. One instance my speedometer did the same thing but so far that's a one time thing. Not overly concerned with that, read it's likely the motors??

My question, is you mentioned using the bafx and auto doctor to see if the DDM and BCM are communicating...where is that found in the app? Seems torque pro is more popular, what advantage does auto doctor have over torque pro?

Ordering the bafx, curious if those experienced, may find a certain app more beneficial.

carnau · December 29, 2017

It will not let me reply to this for some reason...

carnau · December 29, 2017

29 minutes ago, inline said:

Carnau

Due to holidays and weather, haven't put much thought into my trucks issue but this evening, noticed the interior light was coming on when the door opened.....so for now it works. Been having issue with the tach, reads way off, like a thousand too low when I first start truck but if I stop and restart, after that, it works. One instance my speedometer did the same thing but so far that's a one time thing. Not overly concerned with that, read it's likely the motors??

My question, is you mentioned using the bafx and auto doctor to see if the DDM and BCM are communicating...where is that found in the app? Seems torque pro is more popular, what advantage does auto doctor have over torque pro?

Ordering the bafx, curious if those experienced, may find a certain app more beneficial.

Ok I have tried to reply to this like 5 times now with a response... Let me try again.

I don't know about torque pro. I have always used autodoctor Pro. But the new update sucks and is very hard to use. I can still use it but it isn't easy like it use to be.

I am checking into a new thing now called Bluedriver.

Here is the reason why.