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HOMESERVICE MANUALSGMC2024SIERRA 2500 HD DENALI ULTIMATEREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTENTERTAINMENT SYSTEMSCELLULAR, ENTERTAINMENT, AND NAVIGATION - DIAGNOSTIC INFORMATION AND PROCEDURESDIAGNOSTIC INFORMATION AND PROCEDURESDTC B1346CIRCUIT/SYSTEM TESTING
2024 GMC Sierra 2500 HD Denali Ultimate

Circuit/System Testing

2024 GMC Sierra 2500 HD Denali UltimateSECTION Circuit/System Testing
NOTE:
  • 10 V reference circuit measurement may vary with vehicle battery voltage.
  • Test for voltage range with vehicle battery measuring at a minimum of 11.5 V
  1. Vehicle off, disconnect the X1 connector at the A103 Roof Console. It may take up to 2 min for all vehicle systems to power down.
  2. Test the ground circuit terminal 12 for an open/high resistance.
    • If an open/high resistance is found, repair the fault on the circuit. 
    • Go to next step: If an open/high resistance is not found. 
  3. Disconnect the X2 connector at the A103 Roof Console, vehicle in service mode.
  4. Test for 8.0 - 10.5 V between the control circuit terminal 1 and ground.
    • If less than 8.0 V 
    1. Vehicle off, disconnect the X1 harness connector at the K73 Telematic Control Module.
    2. Test circuit 2515 for a short to ground.
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found.
    3. Test circuit 2515 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found.
    4. Replace the K73 Telematic Control Module.
    • If greater than 10.5 V 
    1. Test circuit 2515 for a short to voltage.
      • If a short to voltage is found, repair the fault on the circuit.
      • Go to next step: If a short to voltage is not found.
    2. Replace the K73 Telematic Control Module.
    • Go to next step: If between 8.0 - 10.5 V 
  5. Vehicle off, Test for 500 - 900 Ω between the signal circuit terminal 2 and ground.
    • If less than 500 Ω 
    1. Disconnect the X1 harness connector at the K73 Telematic Control Module.
    2. Test circuit 2514 for a short to ground.
      • If a short to ground is found, repair the fault on the circuit.
      • Go to next step: If a short to ground is not found.
    3. Replace the K73 Telematic Control Module.
    • If greater than 900 Ω 
    1. Disconnect the X1 harness connector at the K73 Telematic Control Module, vehicle in service mode.
    2. Test circuit 2514 for a short to voltage.
      • If a short to voltage is found, repair the fault on the circuit.
      • Go to next step: If a short to voltage is not found.
    3. Vehicle off, test circuit 2514 for an open/high resistance.
      • If an open/high resistance is found, repair the fault on the circuit.
      • Go to next step: If an open/high resistance is not found.
    4. Replace the K73 Telematic Control Module.
    • Go to next step: If between 500 - 900 Ω 
  6. Replace the A103 Roof Console.
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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.