LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 2019 >> CTS Base, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 123 (Cellular System, Entertainment System, And Navigation System - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Voice Recognition Malfunction (UE1 with IOS/IOT) >> 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 2018 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 A11 Radio.
  2. Disconnect the X1 harness connector at the K73 Telematics Communication Interface Control Module. Ignition On/Vehicle in Service Mode.
  3. Test for less than 1 V between the signal circuit terminal listed below and ground.
    • Voice recognition audio signal terminal 14
    • Voice recognition audio low reference terminal 15
    • If 1 V greater 

      Repair the short to voltage on the circuit.

    • Go to next step: 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 14
    • Voice recognition audio low reference terminal 15
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • Go to next step: If infinite resistance 
  6. Test for less than 5 Ω between the terminals listed below:
    • K73 Telematics Communication Interface Control Module signal circuit terminal 15 X1 and the other end of the circuit.
    • K73 Telematics Communication Interface Control Module low reference circuit terminal 14 X1 and the other end of the circuit.
    • If 5 Ω greater 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 5 Ω 
  7. Replace the A11 Radio. Connect all harness connectors.
    8. NOTE:

    Refer to the Owner's Manual and/or the Navigation System Owner's Manual for voice recognition use and commands.

  8. Begin voice recognition for the infotainment system and clearly speak one of the available 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 K73 Telematics Communication Interface Control Module.
    • Go to next step: If the infotainment system responds correctly to the command 
  10. All OK
scientia non olet · About LEMON Manuals