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Component Testing

S79D Window Switch - Driver - Test

  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: S79D Window Switch - Driver
  3. Test for infinite resistance between the test points:
    • Ignition terminal 6 & Control terminal 2 - Switch - Not Pressed
    • Ignition terminal 6 & Control terminal 3 - Switch - Not Pressed
    • Ignition terminal 6 & Control terminal 4 - Switch - Not Pressed
    • Ignition terminal 6 & Control terminal 5 - Switch - Not Pressed
    • Ignition terminal 12 & Control terminal 7 - Switch - Not Pressed
    • Ignition terminal 12 & Control terminal 9 - Switch - Not Pressed
    • Ignition terminal 12 & Control terminal 13 - Switch - Not Pressed
    • Ignition terminal 12 & Control terminal 14 - Switch - Not Pressed
    • If less than infinite resistance 

      Replace the component: S79D Window Switch - Driver

    • Go to next step: If infinite resistance 
  4. Test for less than 3 ohms between the test points:
    • Ground terminal 11 & Control terminal 2 - Switch - Not Pressed
    • Ground terminal 11 & Control terminal 3 - Switch - Not Pressed
    • Ground terminal 11 & Control terminal 4 - Switch - Not Pressed
    • Ground terminal 11 & Control terminal 5 - Switch - Not Pressed
    • Ground terminal 11 & Control terminal 7 - Switch - Not Pressed
    • Ground terminal 11 & Control terminal 9 - Switch - Not Pressed
    • Ground terminal 11 & Control terminal 13 - Switch - Not Pressed
    • Ground terminal 11 & Control terminal 14 - Switch - Not Pressed
    • If 3 ohms or greater 

      Replace the component: S79D Window Switch - Driver

    • Go to next step: If less than 3 ohms 
  5. Operate the component: Driver Left Front Window Switch - Pressed/Pulled
  6. Test for less than 3 ohms between the test points:
    • {LHD} Ignition terminal 12 & Control terminal 7
    • {LHD} Ignition terminal 12 & Control terminal 9
    • {RHD} Ignition terminal 12 & Control terminal 13
    • {RHD} Ignition terminal 12 & Control terminal 13
    • If 3 ohms or greater 

      Replace the component: S79D Window Switch - Driver

    • Go to next step: If less than 3 ohms 
  7. Operate the component: Right Front Window Switch - Pressed & Pulled
  8. Test for less than 3 ohms between the test points:
    • {RHD} Ignition terminal 12 & Control terminal 7
    • {RHD} Ignition terminal 12 & Control terminal 9
    • {LHD} Ignition terminal 12 & Control terminal 13
    • {LHD} Ignition terminal 12 & Control terminal 14
    • If 3 ohms or greater 

      Replace the component: S79D Window Switch - Driver

    • Go to next step: If less than 3 ohms 
  9. Operate the component: Left Rear Window Switch - Pressed & Pulled
  10. Test for less than 3 ohms between the test points:
    • Ignition terminal 6 & Control terminal 2
    • Ignition terminal 6 & Control terminal 3
    • If 3 ohms or greater 

      Replace the component: S79D Window Switch - Driver

    • Go to next step: If less than 3 ohms 
  11. Operate the component: Right Rear Window Switch - Pressed & Pulled
  12. Test for less than 3 ohms between the test points:
    • Ignition terminal 6 & Control terminal 4
    • Ignition terminal 6 & Control terminal 5
    • If 3 ohms or greater 

      Replace the component: S79D Window Switch - Driver

    • Go to next step: If less than 3 ohms 
  13. Window Lockout Switch - Not Pressed
  14. Test for less than 3 ohms between the test points: Ignition terminal 6 & Control terminal 1
    • If less than infinite resistance 

      Replace the component: S79D Window Switch - Driver

    • Go to next step: If infinite resistance 
  15. Operate the component: Window Lockout Switch - Pressed
  16. Test for infinite resistance between the test points: Ignition terminal 6 & Control terminal 1
    • If 3 ohms or greater 

      Replace the component: S79D Window Switch - Driver

    • Go to next step: If less than 3 ohms 
  17. All OK.

S79P Window Switch - Passenger - Test

  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: S79P Window Switch - Passenger
  3. Test for infinite resistance between the test points:
    • Ignition terminal 5 & Control terminal 1 - Switch - Not Pressed
    • Ignition terminal 5 & Control terminal 4 - Switch - Not Pressed
    • If less than infinite resistance 

      Replace the component: S79P Window Switch - Passenger

    • Go to next step: If infinite resistance 
  4. Test for less than 3 ohms between the test points:
    • Control terminal 6 & Control terminal 4 - Switch - Not Pressed
    • Control terminal 3 & Control terminal 1 - Switch - Not Pressed
    • If 3 ohms or greater 

      Replace the component: S79P Window Switch - Passenger

    • Go to next step: If less than 3 ohms 
  5. Operate the component: S79P Window Switch - Passenger - Pressed & Pulled
  6. Test for less than 3 ohms between the test points:
    • Ignition terminal 5 & Control terminal 1
    • Ignition terminal 5 & Control terminal 4
    • If 3 ohms or greater 

      Replace the component: S79P Window Switch - Passenger

    • Go to next step: If less than 3 ohms 
  7. All OK.

S79LR Window Switch - Left Rear - Test

  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: S79LR Window Switch - Left Rear
  3. Test for infinite resistance between the test points:
    • Signal terminal 5 & Control terminal 1 - Switch - Not Pressed
    • Signal terminal 5 & Control terminal 4 - Switch - Not Pressed
    • If less than infinite resistance 

      Replace the component: S79LR Window Switch - Left Rear

    • Go to next step: If infinite resistance 
  4. Test for less than 3 ohms between the test points:
    • Control terminal 1 & Control terminal 6 - Switch - Not Pressed
    • Control terminal 4 & Control terminal 3 - Switch - Not Pressed
    • If 3 ohms or greater 

      Replace the component: S79LR Window Switch - Left Rear

    • Go to next step: If less than 3 ohms 
  5. Operate the component: S79LR Window Switch - Left Rear - Pressed & Pulled
  6. Test for less than 3 ohms between the test points:
    • Signal terminal 5 & Control terminal 1
    • Signal terminal 5 & Control terminal 4
    • If 3 ohms or greater 

      Replace the component: S79LR Window Switch - Left Rear

    • Go to next step: If less than 3 ohms 
  7. All OK.

S79RR Window Switch - Right Rear - Test

  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: S79RR Window Switch - Right Rear
  3. Test for infinite resistance between the test points:
    • Signal terminal 5 & Control terminal 1 - Switch - Not Pressed
    • Signal terminal 5 & Control terminal 4 - Switch - Not Pressed
    • If less than infinite resistance 

      Replace the component: S79RR Window Switch - Right Rear

    • Go to next step: If infinite resistance 
  4. Test for less than 3 ohms between the test points:
    • Control terminal 1 & Control terminal 6 - Switch - Not Pressed
    • Control terminal 4 & Control terminal 3 - Switch - Not Pressed
    • If 3 ohms or greater 

      Replace the component: S79RR Window Switch - Right Rear

    • Go to next step: If less than 3 ohms 
  5. Operate the component: S79RR Window Switch - Right Rear - Pressed & Pulled
  6. Test for less than 3 ohms between the test points:
    • Signal terminal 5 & Control terminal 1
    • Signal terminal 5 & Control terminal 4
    • If 3 ohms or greater 

      Replace the component: S79RR Window Switch - Right Rear

    • Go to next step: If less than 3 ohms 
  7. All OK.

M74 Window Motor - Test

  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the appropriate electrical connector: M74P Window Motor - Passenger/M74LR Window Motor - Left Rear/M74RR Window Motor - Right Rear
  3. Connect a 25 A fused jumper wire between the test points: Control terminal 1 & B+
  4. Momentarily connect a jumper wire between the test points: Control terminal 2 & Ground

    Reverse the jumper wires 2 times between the terminals.

    Verify the component operates in both directions: M74 Window Motor = Up & Down

    • If not the specified state 

      Replace the component: M74P Window Motor - Passenger/M74LR Window Motor - Left Rear/M74RR Window Motor - Right Rear

    • Go to next step: If the specified state 
  5. All OK.
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