3. Check Microphone Signal

WARNING: This page is about a different car, the 2004 Infiniti Q45. However, it is still accessible from the selected car via links, so may be relevant.

Connect voice activated control module connector and microphone connector.
Turn ignition switch ON.
Speak to microphone and check voltage signal between voice activated control module connector B69 terminals 34 (R/W) and 33 (L) with CONSULT-II or oscilloscope.

Fig 1: Checking Microphone Signal
Courtesy of NISSAN MOTOR CO., U.S.A.

34 (R/W) - 33 (L): Refer to TERMINALS & REFERENCE VALUES FOR VOICE ACTIVATED CONTROL MODULE .

OK or NG

OK: Replace voice activated control module.
NG: Replace microphone.