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Home >> Cadillac >> 2008 >> Escalade EXT >> Repair and Diagnosis >> Accessories & Equipment >> Entertainment Systems >> Cellular System, Entertainment System, And Navigation System >> Diagnostic Information and Procedures >> DTC B2476 or B2482 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the CIM X1 harness connector and the inside rearview mirror.
  2. Test for less than 5 ohms between the mirror ground circuit terminal 8 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Test for infinite resistance between the keypad signal circuit terminal 11 and ground.
    • If less than the specified range, test the keypad signal circuit for a short to ground.
  4. Reconnect the CIM X1 harness connector.
  5. Ignition ON, test for 0 volt between the keypad signal circuit terminal 11 and ground.
    • If greater than the specified range, test the keypad signal circuit for a short to voltage. If the circuit tests normal, replace the CIM.
  6. Test for 9.8-10.2 volts between the keypad supply voltage circuit terminal 12 and ground.
    • If less than the specified range, test the supply voltage circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the CIM.
    • If greater than the specified range, test the supply voltage circuit for a short to voltage. If the circuit tests normal, replace the CIM.
  7. Test for 9.8-10.2 volts between the keypad supply voltage circuit terminal 12 and the keypad signal circuit terminal 11.
    • If less than the specified range, test the keypad signal circuit for an open/high resistance. If the circuit tests normal, replace the CIM.
  8. If all circuits test normal, test or replace the button assembly.
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