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Component Testing

  1. Ignition OFF, disconnect the harness connector at the button assembly.
  2. Test for infinite resistance between the keypad supply voltage terminal A and the keypad signal terminal B.
    • If less than the specified range, replace the button assembly.
  3. Test for 1.4 k-1.6 k Ω between the keypad supply voltage terminal A and the keypad signal terminal B while pressing the red emergency button.
    • If not within the specified range, replace the button assembly.
  4. Test for 2.7 k-3.3 k Ω between the keypad supply voltage terminal A and the keypad signal terminal B while pressing the blue On-Star® button.
    • If not within the specified range, replace the button assembly.
  5. Test for 12.5 k-13.5 k Ω between the keypad supply voltage terminal A and the keypad signal terminal B while pressing the black phone button.
    • If not within the specified range, replace the button assembly.
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