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Home >> Cadillac >> 2017 >> XT5 Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Entertainment Systems >> Cellular System, Entertainment System, And Navigation System >> Diagnostic Information and Procedures >> DTC B245C: Telematics Audio Output circuit >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition/Vehicle Off and all vehicle systems Off, disconnect the harness connector at the P50 Emergency/Call Backup Speaker. Ignition ON/Vehicle in Service Mode.
  2. Test for 5 - 7 V between each audio signal circuit terminal 1 and terminal 2 and ground.
    • If less than 5 V 
    1. Ignition OFF, disconnect the harness connector X1 and X2 at the K73 Telematics Communication Interface Control Module.
    2. Test for infinite resistance between the signal circuits and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K73 Telematics Communication Interface Control Module.
    • If greater than 7 V 
    1. Ignition OFF, disconnect the harness connector X1 and X2 at the K73 Telematics Communication Interface Control Module. Ignition ON/Vehicle in Service Mode.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the K73 Telematics Communication Interface Control Module.
    • If between 5 - 7 V 
  3. Test or replace the P50 Emergency/Call Backup Speaker.
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