Intermittent passenger door position switch

[Matthew Jeschke]

My friend's 2014 Chevy Silverado has a intermittent door ajar switch.

When going down the road, if a bump it hit the interior lights come on and the door chime sounds. I suspect the wiring harness has an issue where it bends in the door jam. However, I don't have a pinout for that harness. Does anybody have the pinout and color codes for the door position switch in the door wiring harness? I want to probe them at the connector on the A pillar and see if there's an issue.

 

[BigDogYJ]

are you sure the actual door latch switch is not the problem? I haven't had it on my gmt900, but my gmt800's have a had a couple of them go bad over the years. one would only freak out when it got wet. fun when truck was locked at a campground and raining when the alarm kept going off. Might be worth a check.

 

[OR VietVet]

Likely the latch or something in the umbilical cord broken or rubbed thru. The connector at latch would be more suspect than the one at dash.

 

[Fless]

Might find a diagram here:

Free Car Service Manuals from LEMON Manuals

LEMON Manuals provides free repair/service/workshop manuals for about 10,000 US and Canada market vehicles from 1960-2025. No sign-up, no paywall!

lemon-manuals.la

 

[Matthew Jeschke]

I was looking for the wiring diagram to isolate the switch and make sure the connection was good first... that way I can isolate the issue and know for sure if it's the switch and or the wiring.

are you sure the actual door latch switch is not the problem? I haven't had it on my gmt900, but my gmt800's have a had a couple of them go bad over the years. one would only freak out when it got wet. fun when truck was locked at a campground and raining when the alarm kept going off. Might be worth a check.

That would be annoying having your alarm go off randomly!

are you sure the actual door latch switch is not the problem? I haven't had it on my gmt900, but my gmt800's have a had a couple of them go bad over the years. one would only freak out when it got wet. fun when truck was locked at a campground and raining when the alarm kept going off. Might be worth a check.

It seems his does it every time we hit a bump. I suspect it maybe the switch but want to make sure.

Likely the latch or something in the umbilical cord broken or rubbed thru. The connector at latch would be more suspect than the one at dash.

I hear ya, my plan is to pull the panel and check the connection through the door. I need to know the return path (ground) and the signal wires though.

Might find a diagram here:

Free Car Service Manuals from LEMON Manuals

LEMON Manuals provides free repair/service/workshop manuals for about 10,000 US and Canada market vehicles from 1960-2025. No sign-up, no paywall!

lemon-manuals.la

WOW WOW WOW! BOOKMARKED! Dang thanks for sharing those manuals! Super cool, hopefully it stays up and they don't take that website down. I'm already finding what I need...

Door Latch Connector & Door to Body Connector

Ajar switch signal is gray wire pin 5 to pin 12 body. Circuit 746
Ground is black Pin 3 to pin 2 body. Circuit 1250

Wiring Diagram

 

[OR VietVet]

A tested good connection, when sitting and not moving, may change as soon as you drive.

 

[LsHart]

Is the switch dry? A little WD40 and open and close the door 6 or 7 times will free them up usually.

 

[Matthew Jeschke]

Is the switch dry? A little WD40 and open and close the door 6 or 7 times will free them up usually.

That's the first plan... I'm going to blow out the switch with compressed air and then hit it with some electronic parts cleaner, possibly a little spray lithium grease afterwards.

A tested good connection, when sitting and not moving, may change as soon as you drive.

Thanks, I'll wiggle the harness to see if connection holds. Had similar problem with my GMT800, where the harness had issues in the flexible part by the door hinge.

 

[OR VietVet]

That's the first plan... I'm going to blow out the switch with compressed air and then hit it with some electronic parts cleaner, possibly a little spray lithium grease afterwards.


Thanks, I'll wiggle the harness to see if connection holds. Had similar problem with my GMT800, where the harness had issues in the flexible part by the door hinge.

Air pressure is ok and so is the electronic parts cleaner. No to the lithium grease.

 

[Matthew Jeschke]

Air pressure is ok and so is the electronic parts cleaner. No to the lithium grease.

Good to know. Would you put some sort of grease in there? At least where the clasp goes?

 

[OR VietVet]

Good to know. Would you put some sort of grease in there? At least where the clasp goes?

No. Just the cleaner.

 

[LsHart]

Air pressure is ok and so is the electronic parts cleaner. No to the lithium grease.

When that stuff drys out, it's like glue.

 

[LsHart]

Good for door pins and such.

 

[Matthew Jeschke]

I finally met back up with my friend. I'm super stupid he has a 2010 Silverado and I looked up a 2014. Turns out the FSM formatting changed sometime between those years. The older impossible to search format is utilized by the 2010. I can find most of what I need except for the door to body connector end view and circuit diagram for routing the door ajar signal to BCM.

I want to probe the door ajar signal at the connector in the footwell where it enters the body from the door. However, I cannot for the LIFE of me find that connector end view or what it's called. I found a list of connectors and splice packs in the door HERE. There's X600 (door power and signals) and X601 (collision sensor) along with a few splice packs (but not what the splice packs are splicing, grounds???). I found door ajar signal in the harness for the rear doors, X800. However, I cannot find the door ajar signal for the front passenger door (nor driver side)! Super annoying. Maybe a typo in the FSM????

I did see the door ajar signal is a discrete (on / off) signal converted by BCM to serial data for instrument cluster as I'd suspected. I also found the signal from the door ajar switch in the BCM connector. But cannot find it at the door to body connector nor what the body side connector is even called. I noticed the door lock switch is a ground connected through the BCM, so the BCM can detect if the lock mechanism is working via measuring current across ground. However, that's nothing to do with door ajar signal / the door clasp!

These older FSM formats are harder than heck to search. Been at it for literally a couple hours.

Anybody know where I can find the body side connector end view / pinout containing which pin is the door ajar signal for the front passenger side door?

Likely the circuit is just a connection to BCM, however, any schematics would be nice too.

I'm giving up I've been at this for hours. I probably could have fixed it w/o anything by this point, however, I want to pass info off onto him so he can do the repair and he'll need it.

NOTE: I also wiggled the conduit containing door wiring to body, and it had no effect. Only slamming the door seems to resolve the issue. I think it's something inside the door, likely the switch itself but confirming wiring is correct would be prudent IMO.

Thanks for the help!!!!!

 

[mikez71]

Maybe the door jamb switches shown in 3rd diagram?
Connects to door module which communicates with BCM.

Interior Lights Schematics — 2010 Chevrolet Silverado 1500 4WD V8-5.3L Service Manual | Operation CHARM

Detailed repair manual for the 2010 Chevrolet Silverado 1500 4WD V8-5.3L.

charm.li

 

[Matthew Jeschke]

Awesome thanks!