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2014 Silverado Front Pass Window Not Working

Kerrdog

By Kerrdog
in Troubleshooting & Recalls

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Kerrdog New Member

Kerrdog

Posted
Posted (edited)

Hi All, 

New member here. I will apologize first for bringing this topic! I've read so many posts about it, but I have not been able to solve it. EVERYTHING that everybody does to remedy this problem has not worked for me, and I have spent countless hours working on it. I AM HOPING YOU CAN HELP! 

 

I'm working on my 2014 Silverado LT. I've had it only a short time. It was a farm truck before I got it. Bought it from a GM dealer that was going to take it to auction. I have fixed so much stuff! I joined another forum and got some input initially, but it is pretty dead! So I'm trying this one. I feel a little crappy joining yet another forum for this issue, please forgive me. My current problem is the front passenger window does not operate with any switch. The window WAS up but now it is down. I replaced the regulator with an aftermarket brand from a known vendor (not Amazon). The new regulator did not fix the problem. So I replaced it with another, and still not fixed. I then replaced the passenger switch and still nothing. It was suggested I check the boot in the door, which I did, and found three broken or modified wires on the driver's side. I spliced the broken wires, soldered and heat shrink. But one wire was modified, or hacked. I believe it is the data line (green wire) and it goes to the BCM. The PO had spliced a new wire into the door harness bypassing the main plug in the A pillar, connecting into the BCM Pink plug. My testing, if I did it correctly, shows a dead pin at the A pillar plug, and hence the bypassed wire. I ohmed the spliced wire and it is good. So I believe the signal is there. ALL FUNCTIONS WORK ON ALL SWITCHES, except the passenger window from either switch. I have since replaced the driver's side switch as well, using OEM switches. I get battery power to the switch, but no power THROUGH the switch. I want to get this fixed once and for all, but at the very least get the window back up so I can drive my truck! It's raining every day here, and the truck is parked under cover. I have also tried applying battery power directly to one pin on the motor and battery ground to the other just to get the window up, but that doesn't work... the regulator does nothing. I'm wondering if the data line is the reason the window is not working?? Why wouldn't the regulator work with direct power? My battery is brand new and has 12.5 V. ANY help is greatly appreciated. 

 

My apologies for such a long post. I'm not a mechanic but have better than average aptitude. This is not my first truck build, just the most troublesome one! 

 

Thanks, Scott 

 

Edited by Kerrdog
Kerrdog New Member

Kerrdog

Posted
  • Author
Posted

Well. Thanks for the replies. I will seek help elsewhere. 

asilverblazer Senior Enthusiast

asilverblazer

Posted
Posted
Quote

Circuit/System Testing

Test 1

Note: It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.
  1. Ignition/Vehicle & All vehicle systems » Off
  2. Disconnect the electrical connector: S79D Window Switch - Driver
  3. Test for less than 10 Ω between the test points: Ground circuit terminal 1 & Ground
    • If 10 Ω or greater
     
    1. Ground Connection » Disconnect
    2. Test for less than 2 Ω between the test points: Ground circuit terminal 1 @ Component harness & Ground Connection
      • If 2 Ω or greater » Repair the open/high resistance in the circuit.
      • If less than 2 Ω » Repair the open/high resistance in the ground connection.


    3.  
     
    • If less than 10 Ω

  4. Ignition » On / Vehicle » In Service Mode
  5. Verify a test lamp turns On between the test points: B+ circuit terminal 4 & Ground
    • If the test lamp does not turn On and the circuit fuse is OK
     
    1. Ignition/Vehicle » Off & Remove » Test lamp
      • If 2 Ω or greater » Repair the open/high resistance in the circuit.
      • If less than 2 Ω » Verify the fuse is OK and there is voltage at the fuse.


    2.  
     
    • If the test lamp does not turn On and the circuit fuse is open
     
    1. Ignition/Vehicle » Off & Remove » Test lamp
    2. Test for infinite resistance between the test points: B+ circuit terminal 4 & Ground
      • If less than infinite resistance » Repair the short to ground on the circuit.
      • If infinite resistance » Replace the component: S79D Window Switch - Driver


    3.  
     
    • If the test lamp turns On

  6. Connect the electrical connector. S79D Window Switch - Driver
  7. Disconnect the electrical connector: M74D Window Motor - Driver
  8. Connect a test lamp between the test points: Signal circuit terminal 3 & B+
  9. Ignition » On / Vehicle » In Service Mode
  10. Operate the component: Driver Window Switch @ S79D Window Switch - Driver » Pulled
    Verify the test lamp state:
    Driver Window Switch » Not Used = Test lamp Off
    Driver Window Switch » Pulled = Test lamp On
    • If not the specified state
     
    1. Ignition/Vehicle » Off & Remove » Test lamp
    2. Disconnect the electrical connector: S79D Window Switch - Driver
    3. Ignition » On / Vehicle » In Service Mode
    4. Test for less than 1 V between the test points: Signal circuit terminal 3 @ Component harness & Ground
      • If 1 V or greater » Repair the short to voltage on the circuit.
       
      • If less than 1 V

    5. Ignition/Vehicle » Off
    6. Test for infinite resistance between the test points: Signal circuit terminal 3 @ Component harness & Ground
      • If less than infinite resistance » Repair the short to ground on the circuit.
       
      • If infinite resistance

    7. Test for less than 2 Ω between the test points: Signal circuit terminal 3 @ Component harness & Signal circuit terminal 6 @ S79D Window Switch - Driver
      • If 2 Ω or greater » Repair the open/high resistance in the circuit.
      • If less than 2 Ω » Replace the component: S79D Window Switch - Driver


    8.  
     
    • If the specified state

  11. Connect a test lamp between the test points: Signal circuit terminal 7 & B+
  12. Ignition » On / Vehicle » In Service Mode
  13. Operate the component: Driver Window Switch @ S79D Window Switch - Driver » Pressed
    Verify the test lamp state:
    Driver Window Switch » Not Used = Test lamp Off
    Driver Window Switch » Pressed = Test lamp On
    • If not the specified state
     
    1. Ignition/Vehicle » Off & Remove » Test lamp
    2. Disconnect the electrical connector: S79D Window Switch - Driver
    3. Ignition » On / Vehicle » In Service Mode
    4. Test for less than 1 V between the test points: Signal circuit terminal 7 @ Component harness & Ground
      • If 1 V or greater » Repair the short to voltage on the circuit.
       
      • If less than 1 V

    5. Ignition/Vehicle » Off
    6. Test for infinite resistance between the test points: Signal circuit terminal 7 @ Component harness & Ground
      • If less than infinite resistance » Repair the short to ground on the circuit.
       
      • If infinite resistance

    7. Test for less than 2 Ω between the test points: Signal circuit terminal 7 @ Component harness & Signal circuit terminal 3 @ S79D Window Switch - Driver
      • If 2 Ω or greater » Repair the open/high resistance in the circuit.
      • If less than 2 Ω » Replace the component: S79D Window Switch - Driver


    8.  
     
    • If the specified state

  14. Connect a test lamp between the test points: Signal circuit terminal 5 & B+
  15. Ignition » On / Vehicle » In Service Mode
  16. Operate the component: Driver Window Switch @ S79D Window Switch - Driver » Pressed & Pulled
    Verify the test lamp state:
    Driver Window Switch » Not Used = Test lamp Off
    Driver Window Switch » Pressed = Test lamp On
    Driver Window Switch » Pulled = Test lamp On
    • If not the specified state
     
    1. Ignition/Vehicle » Off & Remove » Test lamp
    2. Disconnect the electrical connector: S79D Window Switch - Driver
    3. Ignition » On / Vehicle » In Service Mode
    4. Test for less than 1 V between the test points: Signal circuit terminal 5 @ Component harness & Ground
      • If 1 V or greater » Repair the short to voltage on the circuit.
       
      • If less than 1 V

    5. Ignition/Vehicle » Off
    6. Test for infinite resistance between the test points: Signal circuit terminal 5 @ Component harness & Ground
      • If less than infinite resistance » Repair the short to ground on the circuit.
       
      • If infinite resistance

    7. Test for less than 2 Ω between the test points: Signal circuit terminal 5 @ Component harness & Signal circuit terminal 2 @ S79D Window Switch - Driver
      • If 2 Ω or greater » Repair the open/high resistance in the circuit.
      • If less than 2 Ω » Replace the component: S79D Window Switch - Driver


    8.  
     
    • If the specified state

  17. Test or replace the component: M74D Window Motor - Driver

Test 2

Note: It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.
  1. Ignition/Vehicle & All vehicle systems » Off
  2. Disconnect the electrical connector: S79P Window Switch - Passenger
  3. Test for less than 10 Ω between the test points:
    • { Without A45 } Ground circuit terminal 1 & Ground
    • { With A45 } Ground circuit terminal 13 & Ground
     
    • If 10 Ω or greater
     
    1. Ground Connection » Disconnect
    2. Test for less than 2 Ω between the test points:
      • { Without A45 } Ground circuit terminal 1 @ Component harness & Ground Connection
      • { With A45 } Ground circuit terminal 13 @ Component harness & Ground Connection
       
      • If 2 Ω or greater » Repair the open/high resistance in the circuit.
      • If less than 2 Ω » Repair the open/high resistance in the ground connection.


    3.  
     
    • If less than 10 Ω

  4. Ignition » On / Vehicle » In Service Mode
  5. Verify the scan tool parameter: Passenger Window Switch at Door = Inactive
    • If not the specified state
     
    1. Ignition/Vehicle » Off
    2. Disconnect the electrical connector: M74P Window Motor - Passenger
    3. Test for infinite resistance between the test points:
      • { With A45 } Signal circuit terminal 15 @ Component harness & Ground
      • { With A45 } Signal circuit terminal 18 @ Component harness & Ground
      • { Without A45 } Signal circuit terminal 6 @ Component harness & Ground
      • { Without A45 } Signal circuit terminal 3 @ Component harness & Ground
       
      • If less than infinite resistance » Repair the short to ground on the circuit.
      • If infinite resistance » Replace the component: M74P Window Motor - Passenger


    4.  
     
    • If the specified state

  6. Momentarily connect a 3 A fused jumper wire between the test points:
    • { With A45 } Signal circuit terminal 18 @ Component harness & Ground
    • { Without A45 } Signal circuit terminal 6 @ Component harness & Ground
  7. Verify the scan tool parameter: Passenger Window Switch at Door = Up
    • If not the specified state
     
    1. Ignition/Vehicle » Off & Remove » Jumper wire(s)
    2. Disconnect the electrical connector: M74P Window Motor - Passenger
    3. Ignition » On / Vehicle » In Service Mode
    4. Test for less than 1 V between the test points:
      • { With A45 } Signal circuit terminal 18 @ Component harness & Ground
      • { Without A45 } Signal circuit terminal 6 @ Component harness & Ground
       
      • If 1 V or greater » Repair the short to voltage on the circuit.
       
      • If less than 1 V

    5. Ignition/Vehicle » Off
    6. Test for less than 2 Ω between the test points:
      • { With A45 } Signal circuit terminal 18 @ Component harness & Signal circuit terminal 3 @ M74P Window Motor - Passenger
      • { Without A45 } Signal circuit terminal 6 @ Component harness & Signal circuit terminal 3 @ M74P Window Motor - Passenger
       
      • If 2 Ω or greater » Repair the open/high resistance in the circuit.
      • If less than 2 Ω » Replace the component: M74P Window Motor - Passenger


    7.  
     
    • If the specified state

  8. Momentarily connect a 3 A fused jumper wire between the test points:
    • { With A45 } Signal circuit terminal 15 @ Component harness & Ground
    • { Without A45 } Signal circuit terminal 3 @ Component harness & Ground
  9. Verify the scan tool parameter: Passenger Window Switch at Door = Down
    • If not the specified state
     
    1. Ignition/Vehicle » Off & Remove » Jumper wire(s)
    2. Disconnect the electrical connector: M74P Window Motor - Passenger
    3. Ignition » On / Vehicle » In Service Mode
    4. Test for less than 1 V between the test points:
      • { With A45 } Signal circuit terminal 15 @ Component harness & Ground
      • { Without A45 } Signal circuit terminal 3 @ Component harness & Ground
       
      • If 1 V or greater » Repair the short to voltage on the circuit.
       
      • If less than 1 V

    5. Ignition/Vehicle » Off
    6. Test for less than 2 Ω between the test points:
      • { With A45 } Signal circuit terminal 15 @ Component harness & Signal circuit terminal 7 @ M74P Window Motor - Passenger
      • { Without A45 } Signal circuit terminal 3 @ Component harness & Signal circuit terminal 7 @ M74P Window Motor - Passenger
       
      • If 2 Ω or greater » Repair the open/high resistance in the circuit.
      • If less than 2 Ω » Replace the component: M74P Window Motor - Passenger


    7.  
     
    • If the specified state

  10. Test for greater than 10 V between the test points:
    • { With A45 } Signal circuit terminal 14 @ Component harness & Ground
    • { Without A45 } Signal circuit terminal 2 @ Component harness & Ground
     
    • If 10 V or less
     
    1. Ignition/Vehicle » Off
    2. Disconnect the electrical connector: M74P Window Motor - Passenger
    3. Test for infinite resistance between the test points:
      • { With A45 } Signal circuit terminal 14 @ Component harness & Ground
      • { Without A45 } Signal circuit terminal 2 @ Component harness & Ground
       
      • If less than infinite resistance » Repair the short to ground on the circuit.
       
      • If less than infinite resistance

    4. Test for less than 2 Ω between the test points:
      • { With A45 } Signal circuit terminal 14 @ Component harness & Signal circuit terminal 5 @ M74P Window Motor - Passenger
      • { Without A45 } Signal circuit terminal 2 @ Component harness & Signal circuit terminal 5 @ M74P Window Motor - Passenger
        • If 2 Ω or greater » Repair the open/high resistance in the circuit.
        • If less than 2 Ω » Replace the component: M74P Window Motor - Passenger


      •  
     
    • If greater than 10 V

  11. Test or replace the component: S79P Window Switch - Passenger

Test 3

Note: It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.
  1. Ignition/Vehicle & All vehicle systems » Off
  2. Disconnect the electrical connector: S79LR Window Switch - Left Rear
  3. Test for less than 10 Ω between the test points: Ground circuit terminal 5 & Ground
    • If 10 Ω or greater
     
    1. Ground Connection » Disconnect
    2. Test for less than 2 Ω between the test points: Ground circuit terminal 5 @ Component harness & Ground Connection
      • If 2 Ω or greater » Repair the open/high resistance in the circuit.
      • If less than 2 Ω » Repair the open/high resistance in the ground connection.


    3.  
     
    • If less than 10 Ω

  4. Ignition » On / Vehicle » In Service Mode
  5. Verify a test lamp turns On between the test points: B+ circuit terminal 8 & Ground
    • If the test lamp does not turn On and the circuit fuse is OK
     
    1. Ignition/Vehicle » Off & Remove » Test lamp
      • If 2 Ω or greater » Repair the open/high resistance in the circuit.
      • If less than 2 Ω » Verify the fuse is OK and there is voltage at the fuse.


    2.  
     
    • If the test lamp does not turn On and the circuit fuse is open
     
    1. Ignition/Vehicle » Off & Remove » Test lamp
    2. Test for infinite resistance between the test points: B+ circuit terminal 8 & Ground
      • If less than infinite resistance » Repair the short to ground on the circuit.
      • If infinite resistance » Replace the component: S79LR Window Switch - Left Rear


    3.  
     
    • If the test lamp turns On

  6. Ignition/Vehicle » Off
  7. Connect the electrical connector. S79LR Window Switch - Left Rear
  8. Disconnect the electrical connector: M74LR Window Motor - Left Rear
  9. Connect a test lamp between the test points: Control circuit terminal 1 & Control circuit terminal 2
  10. Ignition » On / Vehicle » In Service Mode
  11. Perform the scan tool control function: Left Rear Window Motor
    Verify the test lamp state:
    Left Rear Window Motor » Stop = Test lamp Off
    Left Rear Window Motor » Up = Test lamp On
    Left Rear Window Motor » Down = Test lamp On
    • If not the specified state
     
    1. Ignition/Vehicle » Off & Remove » Test lamp
    2. Disconnect the electrical connector: S79LR Window Switch - Left Rear
    3. Ignition » On / Vehicle » In Service Mode
    4. Test for less than 1 V between the test points:
      • Control circuit terminal 1 @ M74LR Window Motor - Left Rear & Ground
      • Control circuit terminal 2 @ M74LR Window Motor - Left Rear & Ground
       
      • If 1 V or greater » Repair the short to voltage on the circuit.
       
      • If less than 1 V

    5. Ignition/Vehicle » Off
    6. Test for infinite resistance between the test points:
      • Control circuit terminal 1 @ M74LR Window Motor - Left Rear & Ground
      • Control circuit terminal 2 @ M74LR Window Motor - Left Rear & Ground
       
      • If less than infinite resistance » Repair the short to ground on the circuit.
       
      • If infinite resistance

    7. Test for less than 2 Ω between the test points:
      • Control circuit terminal 1 @ M74LR Window Motor - Left Rear & Control circuit terminal 6 @ S79LR Window Switch - Left Rear
      • Control circuit terminal 2 @ M74LR Window Motor - Left Rear & Control circuit terminal 7 @ S79LR Window Switch - Left Rear
        • If 2 Ω or greater » Repair the open/high resistance in the circuit.
        • If less than 2 Ω » Replace the component: S79LR Window Switch - Left Rear


      •  
     
    • If the specified state

  12. Test or replace the component: M74LR Window Motor - Left Rear

Test 4

Note: It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.
  1. Ignition/Vehicle & All vehicle systems » Off
  2. Disconnect the electrical connector: S79RR Window Switch - Right Rear
  3. Test for less than 10 Ω between the test points: Ground circuit terminal 5 & Ground
    • If 10 Ω or greater
     
    1. Ground Connection » Disconnect
    2. Test for less than 2 Ω between the test points: Ground circuit terminal 5 @ Component harness & Ground Connection
      • If 2 Ω or greater » Repair the open/high resistance in the circuit.
      • If less than 2 Ω » Repair the open/high resistance in the ground connection.


    3.  
     
    • If less than 10 Ω

  4. Ignition » On / Vehicle » In Service Mode
  5. Verify a test lamp turns On between the test points: B+ circuit terminal 8 & Ground
    • If the test lamp does not turn On and the circuit fuse is OK
     
    1. Ignition/Vehicle » Off & Remove » Test lamp
      • If 2 Ω or greater » Repair the open/high resistance in the circuit.
      • If less than 2 Ω » Verify the fuse is OK and there is voltage at the fuse.


    2.  
     
    • If the test lamp does not turn On and the circuit fuse is open
     
    1. Ignition/Vehicle » Off & Remove » Test lamp
    2. Test for infinite resistance between the test points: B+ circuit terminal 8 & Ground
      • If less than infinite resistance » Repair the short to ground on the circuit.
      • If infinite resistance » Replace the component: S79RR Window Switch - Right Rear


    3.  
     
    • If the test lamp turns On

  6. Ignition/Vehicle » Off
  7. Connect the electrical connector. S79RR Window Switch - Right Rear
  8. Disconnect the electrical connector: M74RR Window Motor - Right Rear
  9. Connect a test lamp between the test points: Control circuit terminal 1 & Control circuit terminal 2
  10. Ignition » On / Vehicle » In Service Mode
  11. Perform the scan tool control function: Right Rear Window Motor
    Verify the test lamp state:
    Right Rear Window Motor » Stop = Test lamp Off
    Right Rear Window Motor » Up = Test lamp On
    Right Rear Window Motor » Down = Test lamp On
    • If not the specified state
     
    1. Ignition/Vehicle » Off & Remove » Test lamp
    2. Disconnect the electrical connector: S79RR Window Switch - Right Rear
    3. Ignition » On / Vehicle » In Service Mode
    4. Test for less than 1 V between the test points:
      • Control circuit terminal 1 @ M74RR Window Motor - Right Rear & Ground
      • Control circuit terminal 2 @ M74RR Window Motor - Right Rear & Ground
       
      • If 1 V or greater » Repair the short to voltage on the circuit.
       
      • If less than 1 V

    5. Ignition/Vehicle » Off
    6. Test for infinite resistance between the test points:
      • Control circuit terminal 1 @ M74RR Window Motor - Right Rear & Ground
      • Control circuit terminal 2 @ M74RR Window Motor - Right Rear & Ground
       
      • If less than infinite resistance » Repair the short to ground on the circuit.
       
      • If infinite resistance

    7. Test for less than 2 Ω between the test points:
      • Control circuit terminal 1 @ M74RR Window Motor - Right Rear & Control circuit terminal 6 @ S79RR Window Switch - Right Rear
      • Control circuit terminal 2 @ M74RR Window Motor - Right Rear & Control circuit terminal 7 @ S79RR Window Switch - Right Rear
        • If 2 Ω or greater » Repair the open/high resistance in the circuit.
        • If less than 2 Ω » Replace the component: S79RR Window Switch - Right Rear


      •  
     
    • If the specified state

  12. Test or replace the component: M74RR Window Motor - Right Rear

Component Testing

M74LR Window Motor - Left Rear / M74RR Window Motor - Right Rear

Caution: Complete the testing as quickly as possible in order to prevent overheating and damaging the component.
  1. Ignition/Vehicle » Off
  2. Disconnect the appropriate electrical connector: M74LR Window Motor - Left Rear or M74RR Window Motor - Right Rear
  3. Connect a 25 A fused jumper wire between the test points: Control terminal 1 & B+
  4. Momentarily connect a jumper wire between the test points: Control terminal 2 & Ground
    Reverse the jumper wires 2 times between the terminals.
    Verify the component operates in both directions: M74 Window Motor = Up & Down
    • If not the specified state
      Replace the component: M74LR Window Motor - Left Rear or M74RR Window Motor - Right Rear
     
    • If the specified state

  5. All OK.

 

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