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inline Enthusiast

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Posted
Posted

Have a 2003 silverado 1500.  Noticed the interior dome light doesnt come on when I open the drivers door.  Yet it functions normally under all other, normal conditions.

Examples:

Dome light comes on when passenger door is opened.

If I rotate the instrument cluster dimmer wheel all the way up, dome light comes on.

If I unlock doors using key fob, dome light comes on.

I've checked the override switch, it works and is disengaged.

If I turn the key off, and then open the drivers door, radio goes off.  

If I'm in the truck, turn key off and open the door, dome light comes on.

Couple interesting observations.

If I turn the cargo light on, the dome light comes on and goes off, as it should, when drivers door is opened or closed and cargo light stays on till I turn it off.

Second interesting observation.  If I open the drivers door, leave it open, manually turn the dome lights on via the instrument dimmer switch, then turn dimmer switch to the dim position, dome light stays on, until the door closes.

Third observation.

If I open the drivers door, manually turn dome light on, as mentioned in the last observation, if I close the door, dome light slowly goes off as it should.  If I open the door within a couple seconds after the interior light goes out, it will come back on.  However, if I wait more than a few seconds to reopen the door, the dome light won't come on.  

I'm obviously getting feedback from the door sensor, as the radio goes off when the door opens, and when the dome light is on, it knows to slowly go off when the door is shut.

Its almost like its on a timer.  I've no clue how to proceed from here.  Any input would be appreciated.

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carnau Enthusiast

carnau

Posted
Posted

Edit: I need your VIN number (last 8) Or goto you glove box and look at the RPO codes and tell me if you have RPO YE9

 

This is one thing that I do as an electrical specialist at the dealership I work at that I have to watch myself about. I try to group stuff together that may or may not have anything to do with each other. First things first lets start with the basics. Let's forget all the rest and just go with "My dome lights don't come on when I open the drivers door." Let's try to fix just that, and make them come on when you open the door.

 

First. When you open the drivers door when the vehicle is running. Does it say door ajar?

 

Second. Have you had the sun visors out for any reason lately?

 

Third. Do you have access to a scanner that will show you data?

 

I can walk you thought the schematics and help you get this fixed. The open and ajar switch inside the drivers door latch are 2 separate circuits. There commands are different. I'm pretty sure I know what we are going to run into. I just need a little more information to get you going. 

 

Your courtesy lights are controlled by 3 components. 

1.) Body Control module

2.) Drivers door module

3.) Passanger door module

 

Those 3 components are controlled by 3 signals.

1.) Courtesy Lamp switch

2.) Interior lamp defeat switch

3.) Door ajar switches

 

 

 

 

 

 

 

 

carnau Enthusiast

carnau

Posted
Posted

Don't worry about this schematic until you get me the other information. This is more for me not to have to log back in to get the schematic later lol.

 

YE9ddm.thumb.gif.9b2cf4957377d9f750ced64a283f7656.gif

 

W/oYE9ddm2.thumb.gif.a578b342082cbff4f353f00ef6940dca.gif

 

inline Enthusiast

inline

Posted
  • Author
Posted

Thanks for the reply, i do have RPO YE9, as for your other questions:

1.  If the engine is running,  transmission in park, either door open, no indication door is ajar.  However, if engine is running, transmission in reverse or drive, either door open, there's IS indication door is ajar.

2.  Haven't touched the sun visor.  

3. All I have is a cheap code reader, it offers some data reference, not sure it would be sufficient for your objective.  

carnau Enthusiast

carnau

Posted
Posted
49 minutes ago, inline said:

Thanks for the reply, i do have RPO YE9, as for your other questions:

1.  If the engine is running,  transmission in park, either door open, no indication door is ajar.  However, if engine is running, transmission in reverse or drive, either door open, there's IS indication door is ajar.

2.  Haven't touched the sun visor.  

3. All I have is a cheap code reader, it offers some data reference, not sure it would be sufficient for your objective.  

Ok. The next thing I want you to do is check inside the door jam boot for broken wires. This is a bit of a pain in the rear but there is a chance the ground or other wiring could be open causing a feedback problem. 

This is an equinox but it is basically the same repair I want you to check. Like I said it is a pain... But it is an important check.

 

 

inline Enthusiast

inline

Posted
  • Author
Posted

Checked the door harness, at the door jamb.

Removed both ends of the door jamb "boot".

Peeled the tape off the wires, visually inspected every wire.

No imperfections.

Taped wires, reversed previous.

I know you prefer a methodical approach, which is ideal but I realized something during this process and will mention it as it may shed light on the issue.

As I was moving the wires around, looking for cracks or breaks, I figured I would hit the power lock button, to make sure I hadn't inadvertently disconnected something.  Didn't work.  So I tried the power mirrors.  Didn't work.

Was around the truck to the passenger door, tried l I'll lpower lock switch, it DID work.

So I went back to the driver's door, tried the power lock switch, it worked, mirror switch, worked. Dome light came on with door.

I wait a minute, then try power lock switch, didn't work.  Power mirror, didn't work.

Seems functions associated with the driver door, only work if a source other than the door, "wakes it up", the bcm? but times out.

Also noticed if I open driver door, dome light doesn't work, power lock switch doesn't work, power mirror doesn't work but if I leave the door open, turn key on ignition off, dome light comes on and power lock/ mirror works.

 

 

 

inline Enthusiast

inline

Posted
  • Author
Posted

After looking at the door jamb wiring yesterday, thought I'd look the wiring over behind the door panel, today.   It looked fine.  Made sure nothing was disconnected.  Even completely disassembled the door module, cleaned all contact points, even the ones under the rubber keypad? piece.

Nothing improved symptom wise.

First open the driver door, power lock/ mirrors, dome light, don't work....not until I turn the key, open passenger door or use key fob. 

Would a scan tool from one of the parts stores, one I could rent, be good enough to diagnose the bcm or at least tell if it's getting any feedback from the door....or am I limited to a dealer?

carnau Enthusiast

carnau

Posted
Posted

I use a Bluetooth OBD2 Bluetooth Scanner ( http://amzn.to/2jrleqk ) a lot even though I have the computers at the dealership that I can use. It's just so easy to whip my phone out and get the information but the app I use is called auto doctor and you have to pay like 17$ for it as well. Well worth the money BUT I dont have a 2003 vehicle around I can connect to, to see exactly what information it gives you. I personally would ride up to your local dealership and ask the service manager if they would mind walking outside and hooking the tech 2 up to your vehicle and seeing If the body control module is getting the input and sending the output. I hooked my bluetooth scanner up to a 2010 and it showed it. But that's the oldest truck we have on our lot right now.

 

Another idea would be to goto your local college and goto the automotive department and ask the teacher to look. (they have alot of scanners there and they love to get workable vehicles.) I have taught the automotive class at 2 different colleges and at both of them we relied on others peoples vehicles to help us teach the course.

inline Enthusiast

inline

Posted
  • Author
Posted

Thanks, I'll look into that device.  Will the dealer scanner or bafx unit, be able to isolate the source, there's a latch sensor, then one at the bottom of the door, then the door module itself or will it just indicate no input from the door area?

 

inline Enthusiast

inline

Posted
  • Author
Posted

What if we focus on the power lock switch.

If I open driver door, get in truck, shut door, power lock switch on driver door doesn't work...until key is on, or passenger door is opened, or if key fob is used (during this dormant time, key fob will still unlock driver door).  There should be power or ability to function, at the power lock switch all the  time, correct?  Why would there be no power to this switch after the truck sits for a minute (engine/key off doors closed), what controls power to  this switch?  If there's a second source of power, which there must be, as once the passenger door is open, key on, key fob used, everything on the driver door magically works, what's this source?

I'm not sure how a scanner would work, seems I've noticed when a scanner is used, the key is turned on, and once that happens, my door switches function normally.  If door is opened with engine on, trans in gear, door ajar is indicated, so the sensor at the bottom of the door must work, believe it's the ajar button.  I would ask what the latch sensor does but it's function or lack thereof wouldn't explain why the power lock switch has no power unless key is on or passenger door opened.

I'm just asking to better understand. Thanks

***Edit.  Pulled the 15a ddm fuse, looked fine, reinserted the fuse and the dome light came on, power lock/mirror worked.  Shut the door waited a minute, everything on driver door is back in dormant mode/ non functional.

I'm probably annoying you carnau, with my observations.  Not intentional.

 

carnau Enthusiast

carnau

Posted
Posted
5 hours ago, inline said:

What if we focus on the power lock switch.

If I open driver door, get in truck, shut door, power lock switch on driver door doesn't work...until key is on, or passenger door is opened, or if key fob is used (during this dormant time, key fob will still unlock driver door).  There should be power or ability to function, at the power lock switch all the  time, correct?  Why would there be no power to this switch after the truck sits for a minute (engine/key off doors closed), what controls power to  this switch?  If there's a second source of power, which there must be, as once the passenger door is open, key on, key fob used, everything on the driver door magically works, what's this source?

I'm not sure how a scanner would work, seems I've noticed when a scanner is used, the key is turned on, and once that happens, my door switches function normally.  If door is opened with engine on, trans in gear, door ajar is indicated, so the sensor at the bottom of the door must work, believe it's the ajar button.  I would ask what the latch sensor does but it's function or lack thereof wouldn't explain why the power lock switch has no power unless key is on or passenger door opened.

I'm just asking to better understand. Thanks

***Edit.  Pulled the 15a ddm fuse, looked fine, reinserted the fuse and the dome light came on, power lock/mirror worked.  Shut the door waited a minute, everything on driver door is back in dormant mode/ non functional.

I'm probably annoying you carnau, with my observations.  Not intentional.

 

You're not annoying me at all. Lol. I am here to help. Once the doors shut and the truck is locked the power door lock switch should not work. That way if someone is breaking in they can't just hit the unlock button on the door with a cloths hanger and open the door. Try hitting the lock button on the passenger door when the drivers door is not working and tell me if that is doing the same thing.

inline Enthusiast

inline

Posted
  • Author
Posted

I was trying this without the alarm set.

If I turn the truck off, leave doors closed, then wait a few seconds, say a minute after the dome light goes out.  If I push the driver's power lock switch (or power mirrors), nothing happens.......if I reach over to the passenger door and push the power lock switch, doors lock and unlock (both doors).  Here's the oddity, once I push the passenger door lock switch, the driver door lock switch (and power mirror switch) become functional.   However, if I wait say 1 minute, after pushing the passenger door lock switch, to try the driver door switch, it won't work.

Manually turning dome light on or turning key to on position, will also wake up the driver door switches (lock/mirror).  If I turn the engine on, the door switches work fine and don't "time out" like they do if the key is off.

It's just an annoyance at this point, but I'm concerned that if I don't find and fix the problem it might domino effect into something more serious.

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