2020 Chevrolet Camaro SS, 2D Coupe, Standard TransFACTORY OEM SERVICE PROCEDURE

Circuit/System Testing

  1. Ignition OFF/vehicle OFF, disconnect the harness connector at the B24LF Mobile Telephone Microphone - Left Front, ignition ON/vehicle in Service Mode.
  2. Test for 9-11 V between the signal circuit terminal B and ground.
    • If less than 9 V 
    1. Ignition OFF/vehicle 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 11 V 
    1. Ignition OFF/vehicle OFF, disconnect the X1 harness connector at the A11 Radio.
    2. Ignition ON/vehicle in Service Mode, 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 9-11 V 
  3. Test for less than 1 V between the low reference circuit terminal A and ground.
    • If greater than 1 V 
    1. Ignition OFF/vehicle OFF, disconnect the X1 harness connector at the A11 Radio.
    2. Ignition ON/vehicle in Service Mode, test for less than 1 V between the low reference 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 
  4. Test for greater than 9 V between the signal circuit terminal B and the low reference circuit terminal A.
    • If less than 9 V 
    1. Ignition OFF/vehicle OFF, disconnect the X1 harness connector at the A11 Radio.
    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.
      • 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.
    • Go to next step: If greater than 9 V 
  5. Test or replace the B24LF Mobile Telephone Microphone - Left Front.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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