Pinpoint Test 14: Voice Recognition Is Inoperative/Does Not Operate Correctly

PINPOINT TEST 14: VOICE RECOGNITION IS INOPERATIVE/DOES NOT OPERATE CORRECTLY

Normal Operation

When the VOICE switch is pressed, it changes the reference voltage from the audio control module (ACM) and the ACM enters voice recognition mode. A microphone located in the auto-dimming interior mirror receives the voice command and sends a signal to the ACM.The microphone test is available through the scan tool or through the ACM bezel test. 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 voltage signal to the ACM indicating the tone was heard.

- DTC B1D79:01 (Microphone Input: General Electrical Failure) - set by the ACM during the microphone test when it does not receive an adequate signal from the microphone when the test tone is sounded.

Possible Causes
- Fuse
- Wiring, terminals or connectors
- Steering wheel controls
- Microphone (part of the auto-dimming interior mirror)
- ACM

Diagnostic Procedure

CAUTION:Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE:Failure to disconnect the battery when instructed will result in false resistance readings. See Battery Disconnect.

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