Mike's Workshop Manuals: Service manuals for every vehicle
Home >> GMC >> 2024 >> Hummer EV 2 >> Repair and Diagnosis >> Body & Frame >> Fixed And MOVEABLE Windows >> Diagnostic Information and Procedures >> Power Windows Malfunction >> Circuit/System Testing

Circuit/System Testing

Test 1

  1. Vehicle Power Mode - Off.
  2. Disconnect the electrical connector: X1 @ S79D Front Side Door Window Control Switch-Driver.
  3. Verify a test lamp illuminates between ground circuit terminal 11 and B+.
    • If the test lamp does not illuminate 
    1. Repair the open/high resistance on circuit 1150 or the ground connection.
    • Go to next step: If the test lamp illuminates 
  4. Vehicle Power Mode - Run/Service Mode.
  5. Verify a test lamp Illuminates between B+ circuit terminal 24 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Test the B+ circuit 1940 for an open/high resistance.
      • if an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open or high resistance is not found.
    2. Verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Test the B+ circuit 1940 for a short to ground.
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found.
    2. Replace the component: S79D Front Side Door Window Control Switch-Driver.
    • Go to next step: If the test lamp illuminates 
  6. Vehicle Power Mode - Off.
  7. Connect the electrical connector: X1 @ S79D Front Side Door Window Control Switch-Driver.
  8. Disconnect the electrical connector: M74D Front Side Door Window Regulator Motor-Driver.
  9. Verify a test lamp illuminates between ground circuit terminal 1 and B+.
    • If the test lamp does not illuminate 
    1. Repair the open/high resistance on circuit 1150 or the ground connection.
    • Go to next step: If the test lamp illuminates 
  10. Vehicle Power Mode - Run/Service Mode.
  11. Verify a test lamp Illuminates between B+ circuit terminal 2 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Test the B+ circuit 3540 for an open/high resistance.
      • if an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open or high resistance is not found.
    2. Verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Test the B+ circuit 3540 for a short to ground.
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found.
    2. Replace the component: M74D Front Side Door Window Regulator Motor-Driver.
    • Go to next step: If the test lamp illuminates 
  12. Connect a test lamp between the test points: Signal circuit terminal 3 & B+.
  13. Operate the component: Driver Left Front Window Switch @ S79D Front Side Door Window Control Switch-Driver - Pulled.

    Verify the test lamp state:

    Driver Left Front Window Switch - Not Used = Test lamp Off

    Driver Left Front Window Switch - Pulled = Test lamp On

    • If the test lamp is always Off 
    1. Vehicle Power Mode - Off.
    2. Remove the test lamp, disconnect the X1 harness connector at the S79D Front Side Door Window Control Switch-Driver.
    3. Test for less than 2 Ω in the signal circuit 2763 end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • Go to next step: If less than 2 Ω.
    4. Vehicle Power Mode - Run/Service Mode.
    5. Test for less than 1 V between the signal circuit 2763 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the S79D Front Side Door Window Control Switch-Driver.
    • If the test lamp is always ON 
    1. Vehicle Power Mode - Off.
    2. Remove the test lamp, disconnect the X1 harness connector at the S79D Front Side Door Window Control Switch-Driver.
    3. Test for infinite resistance between the signal circuit 2763 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the S79D Front Side Door Window Control Switch-Driver.
    • Go to next step: If the test lamp turns ON and OFF 
  14. Connect a test lamp between the test points: Signal circuit terminal 7 & B+.
  15. Operate the component: Driver Left Front Window Switch @ S79D Front Side Door Window Control Switch-Driver - Pressed.

    Verify the test lamp state:

    Driver Left Front Window Switch - Not Used = Test lamp Off

    Driver Left Front Window Switch - Pulled = Test lamp On

    • If the test lamp is always Off 
    1. Vehicle Power Mode - Off.
    2. Remove the test lamp, disconnect the X1 harness connector at the S79D Front Side Door Window Control Switch-Driver.
    3. Test for less than 2 Ω in the signal circuit 2764 end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • Go to next step: If less than 2 Ω.
    4. Vehicle Power Mode - Run/Service Mode.
    5. Test for less than 1 V between the signal circuit 2764 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the S79D Front Side Door Window Control Switch-Driver.
    • If the test lamp is always ON 
    1. Vehicle Power Mode - Off.
    2. Remove the test lamp, disconnect the X1 harness connector at the S79D Front Side Door Window Control Switch-Driver.
    3. Test for infinite resistance between the signal circuit 2764 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the S79D Front Side Door Window Control Switch-Driver.
    • Go to next step: If the test lamp turns ON and OFF 
  16. Connect a test lamp between the test points: Signal circuit terminal 5 & B+.
  17. Operate the component: Driver Left Front Window Switch @ S79D Front Side Door Window Control Switch-Driver - Pressed.

    Verify the test lamp state:

    Driver Left Front Window Switch - Not Used = Test lamp Off

    Driver Left Front Window Switch - Pulled = Test lamp On

    • If the test lamp is always Off 
    1. Vehicle Power Mode - Off.
    2. Remove the test lamp, disconnect the X1 harness connector at the S79D Front Side Door Window Control Switch-Driver.
    3. Test for less than 2 Ω in the signal circuit 2766 end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • Go to next step: If less than 2 Ω.
    4. Vehicle Power Mode - Run/Service Mode.
    5. Test for less than 1 V between the signal circuit 2766 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the S79D Front Side Door Window Control Switch-Driver.
    • If the test lamp is always ON 
    1. Vehicle Power Mode - Off.
    2. Remove the test lamp, disconnect the X1 harness connector at the S79D Front Side Door Window Control Switch-Driver.
    3. Test for infinite resistance between the signal circuit 2766 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the S79D Front Side Door Window Control Switch-Driver.
    • Go to next step: If the test lamp turns ON and OFF 
  18. Test or replace the component: M74D Front Side Door Window Regulator Motor-Driver.

Test 2

  1. Vehicle Power Mode - Off.
  2. Disconnect the electrical connector: X1 @ S79P Front Side Door Window Switch-Passenger.
  3. Verify a test lamp illuminates between ground circuit terminal 1 and B+.
    • If the test lamp does not illuminate 
    1. Repair the open/high resistance on circuit 1250 or the ground connection.
    • Go to next step: If the test lamp illuminates 
  4. Vehicle Power Mode - Run/Service Mode.
  5. Verify a test lamp Illuminates between B+ circuit terminal 24 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Test the B+ circuit 1940 for an open/high resistance.
      • if an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open or high resistance is not found.
    2. Verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Test the B+ circuit 1940 for a short to ground.
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found.
    2. Replace the component: S79P Front Side Door Window Switch-Passenger.
    • Go to next step: If the test lamp illuminates 
  6. Vehicle Power Mode - Off.
  7. Connect the electrical connector: X1 @ S79P Front Side Door Window Switch-Passenger.
  8. Disconnect the electrical connector: M74P Front Side Door Window Regulator Motor-Passenger.
  9. Verify a test lamp illuminates between ground circuit terminal 1 and B+.
    • If the test lamp does not illuminate 
    1. Repair the open/high resistance on circuit 1250 or the ground connection.
    • Go to next step: If the test lamp illuminates 
  10. Vehicle Power Mode - Run/Service Mode.
  11. Verify a test lamp Illuminates between B+ circuit terminal 2 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Test the B+ circuit 4240 for an open/high resistance.
      • if an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open or high resistance is not found.
    2. Verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Test the B+ circuit 4240 for a short to ground.
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found.
    2. Replace the component: M74P Front Side Door Window Regulator Motor-Passenger.
    • Go to next step: If the test lamp illuminates 
  12. Connect a test lamp between the test points: Signal circuit terminal 3 & B+.
  13. Operate the component: Passenger Front Window Switch @ S79P Front Side Door Window Switch-Passenger.

    Verify the test lamp state:

    Passenger Front Window Switch - Not Used = Test lamp Off

    Passenger Front Window Switch - Pulled = Test lamp On

    • If the test lamp is always Off 
    1. Vehicle Power Mode - Off.
    2. Remove the test lamp, disconnect the X1 harness connector at the S79P Front Side Door Window Switch-Passenger.
    3. Test for less than 2 Ω in the signal circuit 1184 end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • Go to next step: If less than 2 Ω.
    4. Vehicle Power Mode - Run/Service Mode.
    5. Test for less than 1 V between the signal circuit 1184 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the S79P Front Side Door Window Switch-Passenger.
    • If the test lamp is always ON 
    1. Vehicle Power Mode - Off.
    2. Remove the test lamp, disconnect the X1 harness connector at the S79P Front Side Door Window Switch-Passenger.
    3. Test for infinite resistance between the signal circuit 1184 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the S79P Front Side Door Window Switch-Passenger.
    • Go to next step: If the test lamp turns ON and OFF 
  14. Connect a test lamp between the test points: Signal circuit terminal 7 & B+.
  15. Operate the component: Passenger Front Window Switch @ S79P Front Side Door Window Switch-Passenger.

    Verify the test lamp state:

    Passenger Front Window Switch - Not Used = Test lamp Off

    Passenger Front Window Switch - Pulled = Test lamp On

    • If the test lamp is always Off 
    1. Vehicle Power Mode - Off.
    2. Remove the test lamp, disconnect the X1 harness connector at the S79P Front Side Door Window Switch-Passenger.
    3. Test for less than 2 Ω in the signal circuit 5295 end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • Go to next step: If less than 2 Ω.
    4. Vehicle Power Mode - Run/Service Mode.
    5. Test for less than 1 V between the signal circuit 5295 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the S79P Front Side Door Window Switch-Passenger.
    • If the test lamp is always ON 
    1. Vehicle Power Mode - Off.
    2. Remove the test lamp, disconnect the X1 harness connector at the S79P Front Side Door Window Switch-Passenger.
    3. Test for infinite resistance between the signal circuit 5295 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the S79P Front Side Door Window Switch-Passenger.
    • Go to next step: If the test lamp turns ON and OFF 
  16. Connect a test lamp between the test points: Signal circuit terminal 5 & B+.
  17. Operate the component: Passenger Front Window Switch @ S79P Front Side Door Window Switch-Passenger.

    Verify the test lamp state:

    Passenger Front Window Switch - Not Used = Test lamp Off

    Passenger Front Window Switch - Pulled = Test lamp On

    • If the test lamp is always Off 
    1. Vehicle Power Mode - Off.
    2. Remove the test lamp, disconnect the X1 harness connector at the S79P Front Side Door Window Switch-Passenger.
    3. Test for less than 2 Ω in the signal circuit 2765 end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • Go to next step: If less than 2 Ω.
    4. Vehicle Power Mode - Run/Service Mode.
    5. Test for less than 1 V between the signal circuit 2765 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the S79P Front Side Door Window Switch-Passenger.
    • If the test lamp is always ON 
    1. Vehicle Power Mode - Off.
    2. Remove the test lamp, disconnect the X1 harness connector at the S79P Front Side Door Window Switch-Passenger.
    3. Test for infinite resistance between the signal circuit 2765 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the S79P Front Side Door Window Switch-Passenger.
    • Go to next step: If the test lamp turns ON and OFF 
  18. Test or replace the component: M74P Front Side Door Window Regulator Motor-Passenger.

Test 3

  1. Vehicle Power Mode - Off.
  2. Disconnect the electrical connector: X1 @ S79LR Rear Side Door Window Switch-Left.
  3. Verify a test lamp illuminates between ground circuit terminal 1 and B+.
    • If the test lamp does not illuminate 
    1. Repair the open/high resistance on circuit 1150 or the ground connection.
    • Go to next step: If the test lamp illuminates 
  4. Connect the electrical connector: X1 @ S79LR Rear Side Door Window Switch-Left.
  5. Disconnect the electrical connector: M74LR Rear Side Door Window Regulator Motor-Left.
  6. Verify a test lamp illuminates between ground circuit terminal 1 and B+.
    • If the test lamp does not illuminate 
    1. Repair the open/high resistance on circuit 1150 or the ground connection.
    • Go to next step: If the test lamp illuminates 
  7. Vehicle Power Mode - Run/Service Mode.
  8. Verify a test lamp Illuminates between B+ circuit terminal 2 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Test the B+ circuit 3540 for an open/high resistance.
      • if an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open or high resistance is not found.
    2. Verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Test the B+ circuit 3540 for a short to ground.
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found.
    2. Replace the component: M74LR Rear Side Door Window Regulator Motor-Left.
    • Go to next step: If the test lamp illuminates 
  9. Connect a test lamp between the test points: Signal circuit terminal 3 & B+.
  10. Operate the component: Left Rear Window Switch @ S79LR Rear Side Door Window Switch-Left - Pulled.

    Verify the test lamp state:

    Left Rear Window Switch - Not Used = Test lamp Off

    Left Rear Window Switch - Pulled = Test lamp On

    • If the test lamp is always Off 
    1. Vehicle Power Mode - Off.
    2. Remove the test lamp, disconnect the X1 harness connector at the S79LR Rear Side Door Window Switch-Left.
    3. Test for less than 2 Ω in the signal circuit 1185 end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • Go to next step: If less than 2 Ω.
    4. Vehicle Power Mode - Run/Service Mode.
    5. Test for less than 1 V between the signal circuit 1185 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the S79LR Rear Side Door Window Switch-Left.
    • If the test lamp is always ON 
    1. Vehicle Power Mode - Off.
    2. Remove the test lamp, disconnect the X1 harness connector at the S79LR Rear Side Door Window Switch-Left.
    3. Test for infinite resistance between the signal circuit 1185 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the S79LR Rear Side Door Window Switch-Left.
    • Go to next step: If the test lamp turns ON and OFF 
  11. Connect a test lamp between the test points: Signal circuit terminal 7 & B+.
  12. Operate the component: Left Rear Window Switch @ S79LR Rear Side Door Window Switch-Left - Pressed.

    Verify the test lamp state:

    Left Rear Window Switch - Not Used = Test lamp Off

    Left Rear Window Switch - Pulled = Test lamp On

    • If the test lamp is always Off 
    1. Vehicle Power Mode - Off.
    2. Remove the test lamp, disconnect the X1 harness connector at the S79LR Rear Side Door Window Switch-Left.
    3. Test for less than 2 Ω in the signal circuit 1187 end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • Go to next step: If less than 2 Ω.
    4. Vehicle Power Mode - Run/Service Mode.
    5. Test for less than 1 V between the signal circuit 1187 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the S79LR Rear Side Door Window Switch-Left.
    • If the test lamp is always ON 
    1. Vehicle Power Mode - Off.
    2. Remove the test lamp, disconnect the X1 harness connector at the S79LR Rear Side Door Window Switch-Left.
    3. Test for infinite resistance between the signal circuit 1187 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the S79LR Rear Side Door Window Switch-Left.
    • Go to next step: If the test lamp turns ON and OFF 
  13. Connect a test lamp between the test points: Signal circuit terminal 5 & B+.
  14. Operate the component: Left Rear Window Switch @ S79LR Rear Side Door Window Switch-Left - Pressed.

    Verify the test lamp state:

    Left Rear Window Switch - Not Used = Test lamp Off

    Left Rear Window Switch - Pulled = Test lamp On

    • If the test lamp is always Off 
    1. Vehicle Power Mode - Off.
    2. Remove the test lamp, disconnect the X1 harness connector at the S79LR Rear Side Door Window Switch-Left.
    3. Test for less than 2 Ω in the signal circuit 5048 end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • Go to next step: If less than 2 Ω.
    4. Vehicle Power Mode - Run/Service Mode.
    5. Test for less than 1 V between the signal circuit 5048 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the S79LR Rear Side Door Window Switch-Left.
    • If the test lamp is always ON 
    1. Vehicle Power Mode - Off.
    2. Remove the test lamp, disconnect the X1 harness connector at the S79LR Rear Side Door Window Switch-Left.
    3. Test for infinite resistance between the signal circuit 5048 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the S79LR Rear Side Door Window Switch-Left.
    • Go to next step: If the test lamp turns ON and OFF 
  15. Test or replace the component: M74LR Rear Side Door Window Regulator Motor-Left.

Test 4

  1. Vehicle Power Mode - Off.
  2. Disconnect the electrical connector: X1 @ S79RR Rear Side Door Window Switch-Right.
  3. Verify a test lamp illuminates between ground circuit terminal 1 and B+.
    • If the test lamp does not illuminate 
    1. Repair the open/high resistance on circuit 1650 or the ground connection.
    • Go to next step: If the test lamp illuminates 
  4. Connect the electrical connector: X1 @ S79RR Rear Side Door Window Switch-Right.
  5. Disconnect the electrical connector: M74RR Rear Side Door Window Regulator Motor-Right.
  6. Verify a test lamp illuminates between ground circuit terminal 1 and B+.
    • If the test lamp does not illuminate 
    1. Repair the open/high resistance on circuit 1650 or the ground connection.
    • Go to next step: If the test lamp illuminates 
  7. Vehicle Power Mode - Run/Service Mode.
  8. Verify a test lamp Illuminates between B+ circuit terminal 2 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Test the B+ circuit 4240 for an open/high resistance.
      • if an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open or high resistance is not found.
    2. Verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Test the B+ circuit 4240 for a short to ground.
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found.
    2. Replace the component: M74RR Rear Side Door Window Regulator Motor-Right.
    • Go to next step: If the test lamp illuminates 
  9. Connect a test lamp between the test points: Signal circuit terminal 3 & B+.
  10. Operate the component: Right Rear Window Switch @ S79RR Rear Side Door Window Switch-Right.

    Verify the test lamp state:

    Right Rear Window Switch - Not Used = Test lamp Off

    Right Rear Window Switch - Pulled = Test lamp On

    • If the test lamp is always Off 
    1. Vehicle Power Mode - Off.
    2. Remove the test lamp, disconnect the X1 harness connector at the S79RR Rear Side Door Window Switch-Right.
    3. Test for less than 2 Ω in the signal circuit 1186 end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • Go to next step: If less than 2 Ω.
    4. Vehicle Power Mode - Run/Service Mode.
    5. Test for less than 1 V between the signal circuit 1186 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the S79RR Rear Side Door Window Switch-Right.
    • If the test lamp is always ON 
    1. Vehicle Power Mode - Off.
    2. Remove the test lamp, disconnect the X1 harness connector at the S79RR Rear Side Door Window Switch-Right.
    3. Test for infinite resistance between the signal circuit 1186 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the S79RR Rear Side Door Window Switch-Right.
    • Go to next step: If the test lamp turns ON and OFF 
  11. Connect a test lamp between the test points: Signal circuit terminal 7 & B+.
  12. Operate the component: Right Rear Window Switch @ S79RR Rear Side Door Window Switch-Right.

    Verify the test lamp state:

    Right Rear Window Switch - Not Used = Test lamp Off

    Right Rear Window Switch - Pulled = Test lamp On

    • If the test lamp is always Off 
    1. Vehicle Power Mode - Off.
    2. Remove the test lamp, disconnect the X1 harness connector at the S79RR Rear Side Door Window Switch-Right.
    3. Test for less than 2 Ω in the signal circuit 1188 end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • Go to next step: If less than 2 Ω.
    4. Vehicle Power Mode - Run/Service Mode.
    5. Test for less than 1 V between the signal circuit 1188 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the S79RR Rear Side Door Window Switch-Right.
    • If the test lamp is always ON 
    1. Vehicle Power Mode - Off.
    2. Remove the test lamp, disconnect the X1 harness connector at the S79RR Rear Side Door Window Switch-Right.
    3. Test for infinite resistance between the signal circuit 1188 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the S79RR Rear Side Door Window Switch-Right.
    • Go to next step: If the test lamp turns ON and OFF 
  13. Connect a test lamp between the test points: Signal circuit terminal 5 & B+.
  14. Operate the component: Right Rear Window Switch @ S79RR Rear Side Door Window Switch-Right.

    Verify the test lamp state:

    Right Rear Window Switch - Not Used = Test lamp Off

    Right Rear Window Switch - Pulled = Test lamp On

    • If the test lamp is always Off 
    1. Vehicle Power Mode - Off.
    2. Remove the test lamp, disconnect the X1 harness connector at the S79RR Rear Side Door Window Switch-Right.
    3. Test for less than 2 Ω in the signal circuit 5049 end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • Go to next step: If less than 2 Ω.
    4. Vehicle Power Mode - Run/Service Mode.
    5. Test for less than 1 V between the signal circuit 5049 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the S79RR Rear Side Door Window Switch-Right.
    • If the test lamp is always ON 
    1. Vehicle Power Mode - Off.
    2. Remove the test lamp, disconnect the X1 harness connector at the S79RR Rear Side Door Window Switch-Right.
    3. Test for infinite resistance between the signal circuit 5049 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the S79RR Rear Side Door Window Switch-Right.
    • Go to next step: If the test lamp turns ON and OFF 
  15. Test or replace the component: M74RR Rear Side Door Window Regulator Motor-Right.

Test 5

  1. Vehicle Power Mode - Off.
  2. Disconnect the electrical connector: S193 Accessory Power Receptacle Switch.
  3. Verify a test lamp illuminates between ground circuit terminal 10 and B+.
    • If the test lamp does not illuminate 
    1. Repair the open/high resistance on circuit 1850 or the ground connection.
    • Go to next step: If the test lamp illuminates 
  4. Connect the electrical connector: S193 Accessory Power Receptacle Switch.
  5. Disconnect the electrical connector: X4 @ K9 Body Control Module.
  6. Vehicle Power Mode - Run/Service Mode.
  7. Connect a test lamp between the test points: Signal circuit terminal 11 X4 & B+.
  8. Operate the component: S79E Window Switch - Global @ S193 Accessory Power Receptacle Switch - Pressed.

    Verify the test lamp state:

    Not Pressed = Test lamp Off

    Pressed = Test lamp On

    • If the test lamp is always Off 
    1. Vehicle Power Mode - Off.
    2. Remove the test lamp, disconnect the harness connector at the S193 Accessory Power Receptacle Switch.
    3. Test for less than 2 Ω in the signal circuit 7176 end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • Go to next step: If less than 2 Ω.
    4. Vehicle Power Mode - Run/Service Mode.
    5. Test for less than 1 V between the signal circuit 7176 and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the S193 Accessory Power Receptacle Switch.
    • If the test lamp is always ON 
    1. Vehicle Power Mode - Off.
    2. Remove the test lamp, disconnect the harness connector at the S193 Accessory Power Receptacle Switch.
    3. Test for infinite resistance between the signal circuit 7176 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the S193 Accessory Power Receptacle Switch.
    • Go to next step: If the test lamp turns ON and OFF 
  9. Test or replace the component: K9 Body Control Module.
scientia non olet · About Mike's Workshop Manuals