Test W: Voice Recognition Is Inoperative/Does Not Operate Correctly - Vehicles With The SYNC System

PINPOINT TEST W: VOICE RECOGNITION IS INOPERATIVE/DOES NOT OPERATE CORRECTLY - VEHICLES WITH THE SYNC SYSTEM

Normal Operation
When the VOICE button (represented by an icon of someone speaking) is pressed, it changes the reference voltage on circuit VMN54 (BU/OG), and the audio system enters voice recognition mode. If the vehicle is equipped with navigation, the VOICE switch is wired to the audio control module (ACM). If the vehicle is not equipped with navigation, the VOICE switch is wired to the accessory protocol interface module (APIM). A microphone located in the interior rear view mirror receives the voice command and sends a signal to the APIM through circuits VMM13 (YE/GN) and RMM13 (BU). Power to the interior rear view mirror is provided through circuit CBP41 (BU). Ground is provided through circuit GD133 (BK). The microphone is also used to detect outgoing audio during a phone call.

The microphone test (with navigation only) is available through the scan tool. Running this test causes the ACM to produce a test tone. If the system is operating correctly, the microphone detects the tone and produces a signal to the ACM indicating the tone was heard.

If the vehicle is equipped with navigation, the APIM receives the microphone input, and also broadcasts it to the ACM through circuits VMN01 (BU/BN) and RMN01 (GN). This allows voice commands specific to the navigation system to be handled directly by the ACM. The first voice commands spoken determine which system handles the voice commands.

- DTC B1038 (Microphone Input Circuit Failure) - set by the APIM during the on-demand self-test if the APIM does not detect the microphone.
- DTC B2633 (Driver-Front Microphone Circuit Failure) - set by the ACM during the microphone test when the ACM does not receive an adequate signal from the microphone when the test tone is sounded.

This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Steering wheel controls
- Microphone (part of the interior rear view mirror)
- ACM (if equipped with navigation)
- APIM

W1-W4:

W4-W6:

W7-W9:

W10-W12: