Nissan Maxima Service and Repair Manual: Diagnosis system (bluetooth control unit)
Diagnosis Description
The Bluetooth control unit has two diagnostic checks. The first diagnostic
check is performed automatically every ignition cycle during control unit
initialization. The second diagnostic check is performed by the technician
using the steering wheel audio control switches prior to trouble diagnosis.
BLUETOOTH CONTROL UNIT INITIALIZATION CHECKS
- Internal control unit failure
- Bluetooth antenna connection open or shorted
- Steering wheel audio control switches [
(PHONE/SEND),
(PHONE/END)] stuck closed
- Vehicle speed pulse count
- Microphone connection test (with playback to operator)
- Bluetooth inquiry check
OPERATION PROCEDURE

- Turn ignition switch to ACC or ON.
- Wait for the Bluetooth system to complete initialization. This
may take up to 20 seconds.
- Press and hold the steering wheel audio control switch
(PHONE/SEND) button for at least 5
seconds. The Bluetooth system will begin to play a verbal prompt.

- While the prompt is playing, press and hold the steering wheel audio
control switch
(PHONE/END) button until you
hear the "Diagnostics mode" prompt. The Bluetooth system will sound a
5-second beep.
- While the beep is sounding, press and hold the steering wheel
audio control switch
(PHONE/END) button again
until you hear prompts.
- The Bluetooth system has now entered into the diagnostic mode.
Results of the diagnostic checks will be verbalized to the technician.
Refer to AV-362, "Work Flow".
- After the failure records are reported, an interactive microphone
test will be performed. Follow the voice prompt. If the microphone test
fails, refer to AV-362, "Work Flow".
Work Flow

Diagnosis Description
MULTIFUNCTION SWITCH AND PRESET SWITCH SELF-DIAGNOSIS FUNCTION
The ON/OFF operation (continuity) of each switch in the multifunction switch
and preset switch can be checked.
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Audio system
System Diagram
System Description
AUDIO SYSTEM
The audio system consists of the following components
AV control unit
Display unit
BOSE speaker amp.
Window antenna
Steering wheel audio control switches
A/C and AV switch assembly
Front door speakers
Tweeters
Center speaker
...