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HOMESERVICE MANUALSCHEVROLET2019TAHOE LS, 4WD, GAS/ETHANOLREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 98 (CELLULAR SYSTEM, ENTERTAINMENT SYSTEM, AND NAVIGATION SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESVOICE RECOGNITION MALFUNCTIONCIRCUIT/SYSTEM TESTING
2019 Chevrolet Tahoe LS, 4WD, Gas/Ethanol

Circuit/System Testing

2019 Chevrolet Tahoe LS, 4WD, Gas/EthanolSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2018 Chevrolet Sonic. 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 - 11 V between the signal circuit terminal B and ground.
    • If less than 9 V 
    1. Ignition OFF, disconnect the X1 harness connector at the K74 Human Machine 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.
      • 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 K74 Human Machine Interface Control Module.
    • If greater than 11 V 
    1. Ignition OFF, disconnect the X1 harness connector at the K74 Human Machine 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.
      • Go to next step: If less than 1 V, replace the K74 Human Machine Interface Control Module.
    • Go to next step: If between 9 - 11 V 
  3. Test for less than 1 V between the signal circuit terminal A and ground.
    • If greater than 1 V 
    1. Ignition OFF, X1 harness connector at the K74 Human Machine 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, replace the K74 Human Machine Interface Control Module.
    • Go to next step: If less than 1 V 
  4. Ignition OFF, disconnect the X1 harness connector at the K74 Human Machine Interface Control Module.
  5. Test for infinite resistance between the B24 Cellular Phone Microphone 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 
  6. 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

    • Go to next step: If less than 2 Ω 
  7. Replace the B24 Cellular Phone Microphone.
  8. Ignition ON, infotainment system ON.
  9. Begin voice recognition for the infotainment system and clearly speak one of the available commands.
  10. Verify the infotainment system responds correctly to the command.
    • If the infotainment system does not respond correctly to the command. 
    1. Clearly speak a different command.
    2. Verify the infotainment system responds correctly to the command.
      • If the infotainment system does not respond correctly to any commands, replace the K74 Human Machine Interface Control Module.
      • Go to next step: If the infotainment system responds correctly to the command.
    3. Refer to the Owners Manual and/or the Navigation System Owners Manual for hints on speaking commands.
    • Go to next step: If the infotainment system responds correctly to the command. 
  11. All OK.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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