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Old 03-27-2018, 07:50 AM   #1
Nobondo
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2014 Sierra Crew - Right Rear Window Malfunction

G'Day everyone. I have graduated from an 04 to a 14 Sierra and am trying to work out the final gremlin. I had disconnected the battery for an hour to reset the BCM (so they say) and cleared up a permanent door ajar issue on the same door. However, the window will not go down when actuated from the driver's door or passenger door.

Here's where I'm at on the diagnosis.

- window motor is good, but now power to window motor harness/plug

- swapped out window switches with the opposite door and functions as it should

- switch plug has power and good ground

- tests at the window motor harness end done with test light to simulate a load as opposed to volt meter

Here is an excerpt from the manual on how the switches function. Driver's door switch operates through the BCM to actuate the window, but the passenger door switch should be 'old fashioned' in the sense it doesn't need permission from BCM to actuate the window.

BODY BUILDER MANUAL FOR 2015 CHEVROLET SILVERADO/GMC SIERRA ELECTRICAL SECTION



Passenger, Left Rear and Right Rear Express Down Power Windows For the passenger, right rear and left rear doors, when their window switch is pressed in the down position, battery positive voltage is applied to their respective window motor control circuit and ground to the other window motor control circuit causing that window to open. When the individual window switch is pulled in the up position, voltage and ground is applied to the window motor in the opposite direction causing that window to close. The return path to ground is supplied through the inactive control circuit being normally grounded through the window switch. Each passenger and rear window switch communicates to the BCM by a serial data circuit. When the driver wishes to control the passenger, left rear or right rear window, the driver will use the appropriate switch on the driver window switch. When this switch is used, a serial data message is sent to the BCM requesting a window motor command, the BCM will then send a serial data message to the appropriate door window switch which will then command that window to move in the direction requested.
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Old 04-26-2018, 01:36 PM   #2
CharlieBrown
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Re: 2014 Sierra Crew - Right Rear Window Malfunction

kinda late here but...we have seen wire broken where the harness comes out of the apiller to the door...might check that
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Old 04-26-2018, 01:37 PM   #3
Nobondo
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Re: 2014 Sierra Crew - Right Rear Window Malfunction

Quote:
Originally Posted by CharlieBrown View Post
kinda late here but...we have seen wire broken where the harness comes out of the apiller to the door...might check that
Driver's door pillar then right? I had a quick peek there and it seem like an awful tight spot to try and get at the wiring. Would love to see a how-to on that! :-)
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Old 04-26-2018, 03:54 PM   #4
CharlieBrown
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Re: 2014 Sierra Crew - Right Rear Window Malfunction

could be either...yes its tight...harness unplugs under dash
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