Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Circuit/System Testing
- Ignition OFF, disconnect the X1 harness connector at the K74 Human Machine Interface Control Module.
- Disconnect the X2 harness connector at the K73 Telematics Communication Interface Control Module. Ignition On/Vehicle in Service Mode.
- Test for less than 1 V between the signal circuit terminal listed below and ground.
- Voice recognition audio signal terminal 6
- Voice recognition audio low reference terminal 12
- If 1 V greater
Repair the short to voltage on the circuit.
- Go to next step: If less than 1 V
- Ignition OFF.
- Test for infinite resistance between the signal circuits listed below and ground:
- Voice recognition audio signal terminal 6
- Voice recognition audio low reference terminal 12
- If less than infinite resistance
Repair the short to ground on the circuit.
- Go to next step: If infinite resistance
- Test for less than 5 Ω between the terminals listed below:
- K74 Human Machine Interface Control Module signal circuit terminal 1 X1 and the K73 Telematics Communication Interface Control Module signal circuit terminal 6 X2
- K74 Human Machine Interface Control Module low reference circuit terminal 2 X1 and the K73 Telematics Communication Interface Control Module low reference circuit terminal 12 X2
- If 5 Ω greater
Repair the open/high resistance in the circuit.
- Go to next step: If less than 5 Ω
- Replace the K74 Human Machine Interface Control Module. Connect all harness connectors.
- Begin voice recognition for the infotainment system and clearly speak one of the available commands.
- Verify the infotainment system responds correctly to the command.
- If the infotainment system does not respond correctly to the command
- Clearly speak a different command.
- 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
- All OK
Refer to the Owners Manual and/or the Navigation System Owners Manual for voice recognition use and commands.
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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.