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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1232 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> OnStar One or More Buttons Inoperative >> Component Testing

Component Testing

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  1. Ignition OFF, disconnect the harness connector at the inside rearview mirror.
  2. Test for infinite resistance between the keypad supply voltage terminal 12 and the keypad signal terminal 11.
    • If less than the specified range, replace the inside rearview mirror.
  3. Test for 1.4k-1.6k ohms between the keypad supply voltage terminal 12 and the keypad signal terminal 11 while pressing the black phone button.
    • If not within the specified range, replace the inside rearview mirror.
  4. Test for 2.7k-3.3k ohms between the keypad supply voltage terminal 12 and the keypad signal terminal 11 while pressing the blue On-Star® button.
    • If not within the specified range, replace the inside rearview mirror.
  5. Test for 11.7k-14.3k ohms between the keypad supply voltage terminal 12 and the keypad signal terminal 11 while pressing the red emergency button.
    • If not within the specified range, replace the inside rearview mirror.
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