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Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the B24 cellular phone microphone, ignition ON.
  2. Test for 9.5-10.5 V between the signal+ circuit terminal B and ground.
    • If less than 9.5 V 
    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 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 vehicle K73 telematics communication interface control module.
    • If greater than 10.5 V 
    1. Ignition OFF, disconnect the X2 harness connector at the K73 telematics communication interface control module, ignition ON.
    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 9.5-10.5 V 
  3. Ignition ON.
  4. Test for less than 1 V between the singal- circuit terminal A and ground.
    • If greater than 1 V 
    1. Ignition OFF, disconnect the X2 harness connector at the K73 telematics communication interface control module, ignition ON.
    2. Test for less than 1 V between the signal- circuit and ground.
      • If 1 V or greater, repair the short to voltage in the circuit.
      • If less than 1 V, repair the K73 telematics communication interface control module.
    • If less than 1 V 
  5. Test for 9.5-10.5 V between the signal+ circuit terminal B and the signal- circuit terminal A.
    • If not between 9.5-10.5 V 
    1. Ignition OFF, disconnect the connector X2 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 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 between 9.5-10.5 V 
  6. Test or replace the B24 cellular phone microphone.
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