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Home >> Cadillac >> 2008 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 141 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> DTC B1449 >> Circuit/System Testing
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Circuit/System Testing

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  1. Ignition OFF, disconnect the harness connector at the infrared module.
  2. Ignition OFF, test for less than 5.0 ohms between the ground circuit terminal 12 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, rear audio ON, test for 10.0-11.0 volts between the supply voltage circuit terminal 4 and ground.
    • If less than the specified range, test the voltage supply circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the rear audio/HVAC module.
    • If greater than the specified range, test the voltage supply circuit for a short to voltage. If the circuit tests normal, replace the rear audio/HVAC module.
  4. If all circuits test normal, replace the infrared module.
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