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Home › Chevrolet › 2019 › Corvette Stingray, 2D Convertible, Automatic Trans › Repair and Diagnosis › Body & Frame › Windows › Fixed And MOVEABLE Window System › Diagnostic Information and Procedures › Power Windows Malfunction › Circuit/System Testing

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 ohms between the test points:Ground circuit terminal 1 & Ground
    • If 10 ohms or greater 
    1. Ground Connection - Disconnect
    2. Test for less than 2 ohms between the test points:Ground circuit terminal 1@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: 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 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 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
    • Go to next step: 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:S79D Window Switch - Driver - Pulled

    Verify the test lamp state:

    S79D Window Switch - Driver - Not Used=Test lamp Off

    S79D Window Switch - Driver - 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.
      • Go to next step: 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.
      • Go to next step: If infinite resistance
    7. Test for less than 2 ohms between the test points:Signal circuit terminal 3@Component harness & Signal circuit terminal 6@ 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 
  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:S79D Window Switch - Driver - Pressed

    Verify the test lamp state:

    S79D Window Switch - Driver - Not Used=Test lamp Off

    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: Signal circuit terminal 7@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:Signal circuit terminal 7@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:Signal circuit terminal 7@Component harness & Signal circuit terminal 3@ 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 
  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:S79D Window Switch - Driver - Pressed & Pulled

    Verify the test lamp state:

    S79D Window Switch - Driver - Not Used=Test lamp Off

    S79D Window Switch - Driver - Pressed=Test lamp On

    S79D Window Switch - Driver - 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.
      • Go to next step: 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.
      • Go to next step: If infinite resistance
    7. Test for less than 2 ohms between the test points:Signal circuit terminal 5@Component harness & Signal circuit terminal 2@ 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 
  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 ohms between the test points:
    • { Without AAB }Ground circuit terminal 1 & Ground
    • { With AAB }Ground circuit terminal 10 & Ground
    • If 10 ohms or greater 
    1. Ground Connection - Disconnect
    2. Test for less than 2 ohms between the test points:
      • { Without AAB }Ground circuit terminal 1@Component harness & Ground Connection
      • { With AAB }Ground circuit terminal 10@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 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 AAB }Signal circuit terminal 4@Component harness & Ground
      • { With AAB }Signal circuit terminal 6@Component harness & Ground
      • { Without AAB }Signal circuit terminal 7@Component harness & Ground
      • { Without AAB }Signal circuit terminal 8@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
    • Go to next step: If the specified state 
  6. Momentarily connect a 3 A fused jumper wire between the test points:
    • { With AAB }Signal circuit terminal 4@Component harness & Ground
    • { Without AAB }Signal circuit terminal 8@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 AAB }Signal circuit terminal 4@Component harness & Ground
      • { Without AAB }Signal circuit terminal 8@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 less than 2 ohms between the test points:
      • { With AAB }Signal circuit terminal 4@Component harness & Signal circuit terminal 3@M74P Window Motor - Passenger
      • { Without AAB }Signal circuit terminal 8@Component harness & Signal circuit terminal 3@M74P Window Motor - Passenger
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component:M74P Window Motor - Passenger
    • Go to next step: If the specified state 
  8. Momentarily connect a 3 A fused jumper wire between the test points:
    • { With AAB }Signal circuit terminal 6@Component harness & Ground
    • { Without AAB }Signal circuit terminal 7@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 AAB }Signal circuit terminal 6@Component harness & Ground
      • { Without AAB }Signal circuit terminal 7@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 less than 2 ohms between the test points:
      • { With AAB }Signal circuit terminal 6@Component harness & Signal circuit terminal 7@M74P Window Motor - Passenger
      • { Without AAB }Signal circuit terminal 7@Component harness & Signal circuit terminal 7@M74P Window Motor - Passenger
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component:M74P Window Motor - Passenger
    • Go to next step: If the specified state 
  10. Test for greater than 10 V between the test points:
    • { With AAB }Signal circuit terminal 5@Component harness & Ground
    • { Without AAB }Signal circuit terminal 6@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 AAB }Signal circuit terminal 5@Component harness & Ground
      • { Without AAB }Signal circuit terminal 6@Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If less than infinite resistance
    1. Test for less than 2 ohms between the test points:
      • { With AAB }Signal circuit terminal 5@Component harness & Signal circuit terminal 5@ M74P Window Motor - Passenger
      • { Without AAB }Signal circuit terminal 6@Component harness & Signal circuit terminal 5@ M74P Window Motor - Passenger
        • If 2 ohms or greater - Repair the open/high resistance in the circuit.
        • If less than 2 ohms - Replace the component: M74P Window Motor - Passenger
    • Go to next step: If the specified state 
  11. Test or replace the component:S79P Window Switch - Passenger
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