GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2007 🢒 XLR 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Navigation System - Voice Recognition Inoperative

Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    •  Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Reference Information

Schematic Reference

Radio/Navigation System Schematics

Connector End View Reference

Entertainment/Communication Connector End Views

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Circuit/System Testing

With OnStar®

  1. Verify the OnStar® voice recognition is operating normally.
    2. ⇒If the OnStar® voice recognition is inoperative, refer to OnStar Voice Recognition Inoperative .
  2. Ignition OFF, disconnect the radio harness connector C2 and VCIM harness connector X3.
  3. Test for less than 1 volt on the C2 radio harness connector terminals 1and 2.
    4. ⇒If greater than specified value, repair short to voltage.
  4. Test for greater than 1 ohm between the C2 radio harness connector terminal 1and ground.
    5. ⇒If less than specified value, repair short to ground.
  5. Test for greater than 1 ohm between the C2 radio harness connector terminal 2 and ground.
    6. ⇒If less than specified value, repair short to ground.
  6. Test for less than 1 ohm between the C2 radio harness connector terminal 1 and the VCIM harness connector terminal 2.
    7. ⇒If greater than specified value, repair open circuit.
  7. Test for less than 1 ohm between the C2 radio harness connector terminal 2 and the VCIM harness connector terminal 4.
    8. ⇒If greater than specified value, repair open circuit.
  8. If all circuits test normal, replace the radio.

Without OnStar®

  1. Ignition OFF, disconnect the voice recognition microphone harness connector and C2 radio harness connector.
  2. Test for less than 1 volt on the voice recognition microphone harness connector terminals 3 and 2.
    3. ⇒If greater than specified value, repair short to voltage.
  3. Test for greater than 1 ohm between the voice recognition microphone harness connector terminal 3 and ground.
    4. ⇒If less than specified value, repair short to ground.
  4. Test for greater than 1 ohm between the voice recognition microphone harness connector terminal 2 and ground.
    5. ⇒If less than specified value, repair short to ground.
  5. Test for less than 1 ohm between the C2 radio harness connector terminal 1 and the voice recognition microphone harness connector terminal 3.
    6. ⇒If greater than specified value, repair open circuit.
  6. Test for less than 1 ohm between the C2 radio harness connector terminal 2 and the voice recognition microphone harness connector terminal 2.
    7. ⇒If greater than specified value, repair open circuit.
  7. If all circuits test normal, replace the voice recognition microphone.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Steering Wheel Control Switch Assembly Replacement
    •  Control Module References for radio replacement, setup, and programming
    •  Mobile Telephone Microphone Replacement