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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 16 (Cellular, Entertainment, And Navigation System) >> Diagnostic Information and Procedures >> DTC B2455 (without UE1) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
  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 X1 harness connector at the A11 Radio.
    2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground in the circuit.
      • Go to next step: 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 A11 Radio.
    • If greater than 10.5 V 
    1. Ignition OFF, disconnect the X1 harness connector at the A11 Radio, 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.
      • Go to next step: If less than 1 V, replace the A11 Radio.
    • Go to next step: If between 9.5-10.5 V 
  3. Ignition ON.
  4. Test for less than 1 V between the signal circuit terminal A and ground.
    • If greater than 1 V 
    1. Ignition OFF, disconnect the X1 harness connector at the A11 Radio, 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, replace the A11 Radio.
    • Go to next step: 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 less than 9.5 V 
    1. Ignition OFF, disconnect the X1 harness connector at the A11 Radio.
    2. Test for infinite resistance between the signal circuit terminal A and ground.
      • If less than infinite resistance, repair the short to ground in the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 2 Ω in the signal circuit terminal A end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the vehicle A11 Radio.
    • If greater than 10.5 V 
    1. Ignition OFF, disconnect the X1 harness connector at the A11 Radio, ignition ON.
    2. Test for less than 1 V between the signal circuit terminal A and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V, replace the A11 Radio.
    • Go to next step: If between 9.5-10.5 V 
  6. Test or replace the B24 Cellular Phone Microphone.
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