LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 2017 >> CTS Base, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 185 (Cellular System, Entertainment System And Navigation System) >> Diagnostic Information and Procedures >> Voice Recognition Malfunction (IO6 with CW1) >> Circuit/System Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Circuit/System Testing

WARNING: This page is about a different car, the 2016 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X1 harness connector at the K74 Human Machine Interface Control Module.
  2. Disconnect the X1 harness connector at the K31 Navigation Control Module. Ignition ON.
  3. Test for less than 1 V between the signal circuit terminal listed below and ground.
    • Voice recognition audio signal terminal 10
    • Voice recognition audio low reference terminal 9
    • If 1 V greater 

      Repair the short to voltage on the circuit.

    • If less than 1 V 
  4. Ignition OFF.
  5. Test for infinite resistance between the signal circuits listed below and ground:
    • Voice recognition audio signal terminal 10
    • Voice recognition audio low reference terminal 9
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • If infinite resistance 
  6. Test for less than 5 Ω between the terminals listed below:
    • K74 Human Machine Interface Control Module signal circuit terminal 1 X1 and the K31 Navigation Control Module signal circuit terminal 10 X1
    • K74 Human Machine Interface Control Module low reference circuit terminal 2 X1 and the K31 Navigation Control Module low reference circuit terminal 9 X1
    • If 5 Ω greater 

      Repair the open/high resistance in the circuit.

    • If less than 5 Ω 
  7. Replace the K74 Human Machine Interface Control Module. Connect all harness connectors.
  8. Begin voice recognition for the infotainment system and clearly speak one of the available commands.
    NOTE: Refer to the Owners Manual and/or the Navigation System Owners Manual for voice recognition use and commands.
  9. 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 K31 Navigation Control Module.

    • If the infotainment system responds correctly to the command 
  10. All OK
scientia non olet · About LEMON Manuals