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Circuit/System Testing

  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: S79D Window Switch - Driver
  3. Ignition - On/Vehicle - In Service Mode
  4. Verify the scan tool parameter: Driver Window Main Control Down Switch = Inactive
    • If not the specified state 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: M74D Window Motor - Driver
    3. Test for infinite resistance between the test points:
      • {LHD} Signal circuit terminal 8 @ Component harness & Ground
      • {RHD} Signal circuit terminal 12 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: M74D Window Motor - Driver
    • Go to next step: If the specified state 
  5. Momentarily connect a 3 A fused jumper wire between the test points:
    • {LHD} Signal circuit terminal 8 & Ground circuit terminal 11
    • {RHD} Signal circuit terminal 12 & Ground circuit terminal 10
  6. Verify the scan tool parameter: Driver Window Main Control Down Switch = Active
    • If not the specified state 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the electrical connector: M74D Window Motor - Driver
    3. Ignition - On/Vehicle - In Service Mode
    4. Test for less than 1 V between the test points:
      • {LHD} Signal circuit terminal 8 @ Component harness & Ground
      • {RHD} Signal circuit terminal 12 @ 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:
      • {LHD} Signal circuit terminal 8 @ Component harness & Signal circuit terminal 7 @ M74D Window Motor - Driver
      • {RHD} Signal circuit terminal 12 @ Component harness & Signal circuit terminal 7 @ M74D Window Motor - Driver
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: M74D Window Motor - Driver
    • Go to next step: If the specified state 
  7. Verify the scan tool parameter: Driver Window Main Control Up Switch = Inactive
    • If not the specified state 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: M74D Window Motor - Driver
    3. Test for infinite resistance between the test points:
      • {LHD} Signal circuit terminal 9 @ Component harness & Ground
      • {RHD} Signal circuit terminal 14 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: M74D Window Motor - Driver
    • Go to next step: If the specified state 
  8. Momentarily connect a 3 A fused jumper wire between the test points:
    • {LHD} Signal circuit terminal 9 & Ground circuit terminal 11
    • {RHD} Signal circuit terminal 14 & Ground circuit terminal 10
  9. Verify the scan tool parameter: Driver Window Main Control Up Switch = Active
    • If not the specified state 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the electrical connector: M74D Window Motor - Driver
    3. Ignition - On/Vehicle - In Service Mode
    4. Test for less than 1 V between the test points:
      • {LHD} Signal circuit terminal 9 @ Component harness & Ground
      • {RHD} Signal circuit terminal 14 @ 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:
      • {LHD} Signal circuit terminal 9 @ Component harness & Signal circuit terminal 3 @ M74D Window Motor - Driver
      • {RHD} Signal circuit terminal 14 @ Component harness & Signal circuit terminal 3 @ M74D Window Motor - Driver
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: M74D Window Motor - Driver
    • Go to next step: If the specified state 
  10. Test for greater than 10 V between the test points:
    • {LHD} Signal circuit terminal 11 @ Component harness & Ground
    • {RHD} Signal circuit terminal 10 @ Component harness & Ground
    • If 10 V or less 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: M74D Window Motor - Driver
    3. Test for infinite resistance between the test points:
    4. {LHD} Signal circuit terminal 11 @ Component harness & Ground
    5. {RHD} Signal circuit terminal 10 @ 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
    6. Test for less than 2 ohms between the test points:
    • {LHD} Signal circuit terminal 11 @ Component harness & Signal circuit terminal 5 @ M74D Window Motor - Driver
    • {RHD} Signal circuit terminal 10 @ Component harness & Signal circuit terminal 5 @ M74D Window Motor - Driver
    • If 2 ohms or greater - Repair the open/high resistance in the circuit.
    • If less than 2 ohms - Replace the component: M74D Window Motor - Driver
    • Go to next step: If greater than 10 V 
  11. Test or replace the component: S79D Window Switch - Driver
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