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Home >> Chevrolet >> 2018 >> Silverado 1500 SSV, 4WD, Part Time T/Case Control, Gas >> Repair and Diagnosis >> Body & Frame >> Fixed And Movable Windows >> Diagnostic Information And Procedures >> Power Rear Sliding Window Malfunction >> Circuit/System Testing

Circuit/System Testing

  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: S68 Sliding Rear Window Switch
  3. Ignition - On/Vehicle - In Service Mode
  4. Verify a test lamp turns On between the test points: Ignition circuit terminal A & Ground
    • If the test lamp does not turn On and the circuit fuse is OK 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Test for less than 2 ohms between the test points: Ignition circuit terminal A & Output terminal @ F2DL Fuse
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Verify the fuse is OK and there is voltage at the fuse.
    • 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: Ignition circuit terminal A & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for greater than 10 ohms between the test points:
      • Control circuit terminal B & Ground
      • Control circuit terminal C & Ground
      • If 10 ohms or less - Repair short to ground on the circuit.
      • If greater than 10 ohms - Replace the component: S68 Sliding Rear Window Switch
    • Go to next step: If the test lamp turns On 
    5. 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.

  5. Ignition/Vehicle & All vehicle systems - Off
  6. Connect the electrical connector: S68 Sliding Rear Window Switch
  7. Remove the component: KR8A Sliding Rear Window Close Relay & KR8B Sliding Rear Window Open Relay
  8. Test for less than 10 ohms between the test points:
    • Ground circuit terminal 85 & Ground @ KR8A Sliding Rear Window Close Relay
    • Ground circuit terminal 87A & Ground @ KR8A Sliding Rear Window Close Relay
    • Ground circuit terminal 68 & Ground @ KR8B Sliding Rear Window Open Relay
    • Ground circuit terminal 85 & Ground @ KR8B Sliding Rear Window Open Relay
    • If 10 ohms or greater 
    1. Disconnect Ground Connection
    2. Test for less than 2 ohms between the test points:
      • Ground circuit terminal 85 & Ground Connection
      • Ground circuit terminal 87A & Ground Connection
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 ohms 
  9. Connect a test lamp between the test points:
    • Control circuit terminal 86 & Ground circuit terminal 85 @ KR8A Sliding Rear Window Close Relay
    • Control circuit terminal 86 & Ground circuit terminal 85 @ KR8B Sliding Rear Window Open Relay
  10. Ignition - On/Vehicle - In Service Mode
  11. Operate the component: S68 Sliding Rear Window Switch - Pressed & Pulled

    Verify the test lamp turns On and Off.

    • If the test lamp is always Off 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector: S68 Sliding Rear Window Switch
    3. Test for infinite resistance between the test points: Control circuit terminal 86 @ Relay Socket & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance
    4. Test for less than 2 ohms between the test points:
      • Control circuit terminal 86 @ Relay Socket & Terminal B @ Component harness
      • Control circuit terminal 86 @ Relay Socket & Terminal C @ Component harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: S68 Sliding Rear Window Switch
    • If the test lamp is always On 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector: S68 Sliding Rear Window Switch
    3. Ignition - On/Vehicle - In Service Mode
    4. Test for less than 1 V between the test points: Control circuit terminal 86 @ Relay Socket & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component: S68 Sliding Rear Window Switch
    • Go to next step: If the test lamp turns On and Off 
  12. Verify a test lamp turns On between the test points: B+ circuit terminal 87 & Ground
    • If the test lamp does not turn On and the circuit fuse is OK 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Test for less than 2 ohms between the test points: B+ circuit terminal 87 @ Relay Socket & Output terminal @ F2DL Fuse
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Verify the fuse is OK and there is voltage at the fuse.
    • 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 87 & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance
    3. Disconnect the electrical connector: M63 Sliding Rear Window Motor
    4. Test for infinite resistance between the test points: Control circuit terminal 30 @ Relay Socket & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance
    5. Replace the component: F2DL Fuse
    6. Install the component: KR8A Sliding Rear Window Close Relay & KR8B Sliding Rear Window Open Relay
    7. Connect a test lamp between the test points: Control circuit terminal 1 & Control circuit terminal 2
    8. Ignition - On/Vehicle - In Service Mode
    9. Operate the component: S68 Sliding Rear Window Switch - Pressed & Pulled

      Verify the test lamp turns On and Off.

      • If the test lamp does not turn On and Off - Test or replace the component: KR8A Sliding Rear Window Close Relay or KR8B Sliding Rear Window Open Relay
      • If the test lamp turns On and Off - Test or replace the component: M63 Sliding Rear Window Motor
    • Go to next step: If the test lamp turns On 
  13. Ignition/Vehicle & All vehicle systems - Off
  14. Install the component: KR8A Sliding Rear Window Close Relay & KR8B Sliding Rear Window Open Relay
  15. Disconnect the electrical connector: M63 Sliding Rear Window Motor
  16. Connect a test lamp between the test points: Control circuit terminal 1 & Control circuit terminal 2
  17. Ignition - On/Vehicle - In Service Mode
  18. Operate the component: S68 Sliding Rear Window Switch - Pressed & Pulled

    Verify the test lamp state:

    Not Used = Test lamp Off

    Pressed = Test lamp On

    Pulled = Test lamp On

    • If not the specified state 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Remove the component: KR8A Sliding Rear Window Close Relay & KR8B Sliding Rear Window Open Relay
    3. Ignition - On/Vehicle - In Service Mode
    4. Test for less than 1 V between the test points:
      • Control circuit terminal 1 @ Component harness & Ground
      • Control circuit terminal 2 @ 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:
      • Control circuit terminal 1 @ Component harness & Ground
      • Control circuit terminal 2 @ 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 ohms between the test points:
      • Control circuit terminal 1 @ Component harness & Terminal 30 @ Relay Socket
      • Control circuit terminal 2 @ Component harness & Terminal 30 @ Relay Socket
        • If 2 ohms or greater - Repair the open/high resistance in the circuit.
        • If less than 2 ohms - Replace the component: KR8A Sliding Rear Window Close Relay or KR8B Sliding Rear Window Open Relay
    • Go to next step: If the specified state 
  19. Test or replace the component: M63 Sliding Rear Window Motor
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