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Home >> Cadillac >> 2007 >> STS Base, 4.6 A, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 111 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> DTC B2476 or B2482 >> Component Testing
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Component Testing

WARNING: This page is about a different car, the 2009 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
  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 1.4 K - 1.6 K Ω 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 2.7 K - 3.3 K Ω 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 2.7 K - 3.3 K Ω 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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