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Home >> Buick >> 2015 >> Regal GS, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Infotainment >> Cellular System, Entertainment System, And Navigation System - Diagnostic Information And Procedures - DTC & Symptoms >> Diagnostic Information and Procedures >> DTC B2455: Cellular Phone Microphone >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the B24 Cellular Phone Microphone, ignition ON.
  2. Test for 8.0-10.5V between the signal circuit terminal B and ground.
    • If less than 8.0V 
    1. Ignition OFF, disconnect the X2 harness connector at the K73 Telematics Communication Interface Control Module.
    2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground in the circuit.
      • If infinite resistance
    3. Test for less than 2Ω in the signal circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, replace the K73 Telematics Communication Interface Control Module.
    • If greater than 10.5V 
    1. Ignition OFF, disconnect the X2 harness connector at the K73 Telematics Communication Interface Control Module, ignition ON.
    2. Test for less than 1V between the signal circuit and ground.
      • If 1V or greater, repair the short to voltage on the circuit.
      • If less than 1V, replace the K73 Telematics Communication Interface Control Module.
    • If between 8.0-10.5V 
  3. Test for less than 1V between the low reference circuit terminal A and ground.
    • If greater than 1V 
    1. Ignition OFF, disconnect the X2 harness connector at the K73 Telematics Communication Interface Control Module, ignition ON.
    2. Test for less than 1V between the low reference circuit and ground.
      • If 1V or greater, repair the short to voltage in the circuit.
      • If less than 1V, replace the K73 Telematics Communication Interface Control Module.
    • If less than 1V 
  4. Test for greater than 8V between the signal circuit terminal B and the low reference circuit terminal A.
    • If less than 8V 
    1. Ignition OFF, disconnect the X2 harness connector at the K73 Telematics Communication Interface Control Module.
    2. Test for infinite resistance between the low reference circuit and ground.
      • If less than infinite resistance, repair the short to ground in the circuit.
      • If infinite resistance
    3. Test for less than 2Ω in the signal circuit end to end.
      • If 2Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2Ω, replace the vehicle K73 Telematics Communication Interface Control Module.
    • If greater than 8V 
  5. Test or replace the B24 Cellular Phone Microphone.
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