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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 83 (Fixed And MOVEABLE Windows) >> Diagnostic Information and Procedures >> Power Windows Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.

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 ohms between the test points: Ground circuit terminal F & Ground
    • If 10 ohms or greater 
    1. Ground Connection - Disconnect
    2. Test for less than 2 ohms between the test points: Ground circuit terminal F @ Component harness & 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 
  4. Ignition - On / Vehicle - In Service Mode
  5. Verify a test lamp turns On between the test points: Ignition circuit terminal C & 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 C & Output terminal @ CB2PA 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 C & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for infinite resistance between the test points:
      • Control circuit terminal A & Ground
      • Control circuit terminal D & Ground
      • Control circuit terminal G & Ground
      • Control circuit terminal H & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Test or replace the component: S79D Window Switch - Driver
    • Go to next step: If the test lamp turns On 
  6. Ignition/Vehicle - Off
  7. Connect the electrical connector: S79D Window Switch - Driver
  8. Disconnect the electrical connector: M74D Window Motor - Driver
  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. Operate the component: S79D Window Switch - Driver

    Verify the test lamp state:

    • Not Used = Test lamp Off
    • S79D Window Switch - Driver - Pulled = Test lamp On
    • S79D Window Switch - Driver - 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:
      • 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.
      • Go to next step: 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.
      • Go to next step: If infinite resistance
    7. Test for less than 2 ohms between the test points:
      • Control circuit terminal 1 @ Component harness & Terminal H @ S79D Window Switch - Driver
      • Control circuit terminal 2 @ Component harness & Terminal G @ S79D Window Switch - Driver
        • If 2 ohms or greater - Repair the open/high resistance in the circuit.
        • If less than 2 ohms - Replace the component: S79D Window Switch - Driver
    • Go to next step: If the specified state 
  12. Test or replace the component: M74D Window Motor - Driver

Test 2

  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: S79P Window Switch - Passenger
  3. Connect a test lamp between the test points: Control circuit terminal D & Control circuit terminal H
  4. Ignition - On / Vehicle - In Service Mode
  5. Operate the component: Passenger Window Switch @ S79D Window Switch - Driver

    Verify the test lamp state:

    • Not Used = Test lamp Off
    • Passenger Window Switch - Pulled = Test lamp On
    • Passenger 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:
      • Control circuit terminal D @ Component harness & Ground
      • Control circuit terminal H @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    5. Ignition/Vehicle - Off
    6. Test for infinite resistance between the test points:
      • Control circuit terminal D @ Component harness & Ground
      • Control circuit terminal H @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    7. Test for less than 2 ohms between the test points:
      • Control circuit terminal D @ Component harness & Terminal D @ S79D Window Switch - Driver
      • Control circuit terminal H @ Component harness & Terminal A @ S79D Window Switch - Driver
        • If 2 ohms or greater - Repair the open/high resistance in the circuit.
        • If less than 2 ohms - Replace the component: S79D Window Switch - Driver
  6. Ignition/Vehicle - Off
  7. Connect the electrical connector: S79P Window Switch - Passenger
  8. Disconnect the electrical connector: M74P Window Motor - Passenger
  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. Operate the component: Passenger Window Switch @ S79D Window Switch - Driver

    Verify the test lamp state:

    • Not Used = Test lamp Off
    • Passenger Window Switch - Pulled = Test lamp On
    • Passenger Window Switch - Pressed = Test lamp On
    • If not the specified state 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector: S79P Window Switch - Passenger
    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.
      • Go to next step: 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.
      • Go to next step: If infinite resistance
    7. Test for less than 2 ohms between the test points:
      • Control circuit terminal 1 @ Component harness & Terminal G @ S79P Window Switch - Passenger
      • Control circuit terminal 2 @ Component harness & Terminal F @ S79P Window Switch - Passenger
        • If 2 ohms or greater - Repair the open/high resistance in the circuit.
        • If less than 2 ohms - Replace the component: S79P Window Switch - Passenger
    • Go to next step: If the specified state 
  12. Test or replace the component: M74P Window Motor - Passenger

Test 3

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: S79P Window Switch - Passenger
  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 @ CB2PA 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.
    • Go to next step: If the test lamp turns On 
  5. Test or replace the component: S79P Window Switch - Passenger
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