Navigation Radio Voice Recognition is Inoperative, May Not Follow Customer Command or May Not Recognize Customers Voice (Follow Diagnostic Procedure)

Some customers may comment on any or all of the following concerns:

This condition may be caused by electrical noise on the Vehicle Communication Interface Module (VCIM or OnStar®) module battery feed wire being passed to the microphone output pins of the radio.

Technicians are to use the following procedure to diagnose and repair this customer concern:

1. Check for any current microphone Diagnostic Trouble Codes (DTCs) within the VCIM. If a current code is present, address the code using normal diagnostics in SI.
2. Test the following commands using the radio voice recognition system with the vehicle running, windows up, and the Heating, Ventilation and Air Conditioning (HVAC) blower off. The radio should repeat each command when spoken and then the radio should perform the command. When using a help command, the radio will say all the commands that are available for a given section.

•	Voice Help

•	Radio Select AM

•	Radio Select XM

•	Radio Select FM

•	Radio Help

•

CD

•	Radio Select 10 XM

•	Radio Select 88.1 FM

•	Radio Select 107.3 FM

•	Radio Select 710 AM

•	Radio Select 1150 AM

•

OnStar

•	Navigation Help

3. Retest the voice recognition system with the engine off and the ignition in the ACCESSORY position, all windows up, and the HVAC blower off. Use the same commands as listed above.
4. If the voice recognition system performance improves when the engine is not running versus with the engine running, install a noise suppression filter in the battery feed wire of the VCIM.

Important: The noise suppression filter is polarity sensitive. The filter is designed to be most effective when the end with the capacitor ground is connected towards the source of the electrical noise. Install the filter in this polarity first. If the noise level is still not satisfactory, try disconnecting the capacitor ground. In some cases if the first installation does not correct the noise, try reversing the filter polarity (removing the filter, turning it end for end and then reinstalling it) and grounding the capacitor lead.

5. Install the noise suppression filter, P/N 1224205, inline in circuit 3240 a few centimeters/inches from the VCIM. Circuit 3240 is a Red/White wire located in cavity 15 of connector C1 of the VCIM. Connector C1 is a 16 cavity natural colored connector. The filter package has a yellow and a black wire at one end and a single yellow wire at the opposite end. Install the side with the two wires toward the "INFO" fuse (away from the VCIM), installing the yellow wire in circuit 3240 and the black wire to ground. Then install the single yellow wire end towards the VCIM.

For vehicles repaired under warranty, use: