Nissan Sentra Service Manual: System description

Component parts

Component parts location

1. Front tweeter lh (if equipped)
2. Steering switches
3. Audio unit
4. Front tweeter rh (if equipped)
5. Microphone (if equipped)
6. Front door speaker lh
7. Front door speaker RH
8. Rear speaker rh
9. Rear speaker lh
10. Antenna amp.
11. Window antenna
12. BluetoothВ® control unit (if equipped)
13. BluetoothВ® antenna (if equipped)

Component description

System

System diagram

System description

Audio system

The audio system consists of the following components

• Audio unit
• Front door speakers
• Front tweeters (if equipped)
• Rear speakers
• Steering switches
• Antenna amp
• Window antenna

When the audio system is on, am/fm signals received by the window antenna are amplified by the antenna amp. And sent to the audio unit. The audio unit then sends audio signals to the front door speakers, front tweeters and rear speakers.

Refer to owner's manual for audio system operating instructions.

Hands-free phone system (if equipped)

System operation

Note:

Cellular telephones must have their wireless connection set up (paired) before using the bluetoothВ® telephone system.

The bluetoothВ® telephone system allows users who have a bluetoothВ® cellular telephone to make a wireless connection between their cellular telephone and the bluetoothВ® control unit. Hands-free cellular telephone calls can be sent and received. Some bluetoothВ® cellular telephones may not be recognized by the bluetoothВ® control unit. When a cellular telephone or the bluetoothВ® control unit is replaced, the telephone must be paired with the bluetoothВ® control unit. Different cellular telephones may have different pairing procedures, refer to the cellular telephone operating manual.

Refer to the owner's manual for bluetoothВ® telephone system operating instructions.

BluetoothВ® control unit

When the ignition switch is turned to acc or on, the bluetoothВ® control unit will power up. During power up, the bluetoothВ® control unit is initialized and performs various self-checks. Initialization may take up to 20 seconds.

If a phone is present in the vehicle and paired with the bluetoothВ® control unit, nissan voice recognition will then become active. BluetoothВ® telephone functions can be turned off using the nissan voice recognition system.

Steering switches

When buttons on the steering switches are pushed, the resistance in steering wheel audio control switch circuit changes, depending on which button is pushed. The bluetoothВ® control unit uses this signal to perform various functions while navigating through the voice recognition system.

The following functions can be performed using the steering switches:

• Initiate self-diagnosis of the bluetoothВ® telephone system
• Start a voice recognition session
• Answer and end telephone calls
• Adjust the volume of calls

Microphone

The microphone is located in the roof console assembly. The microphone sends a signal to the bluetoothВ® control unit. The microphone can be actively tested during self-diagnosis.

Audio unit

The audio unit receives signals from the bluetoothВ® control unit and sends audio signals to the speakers.

Speed sensitive volume system

Volume level of this system goes up and down automatically in proportion to the vehicle speed. The control level can be selected by the customer. Refer to owner's manual for operating instructions.

Diagnosis system (audio unit)

Diagnosis Description

The audio unit on board diagnosis performs the functions listed in the table below:

On Board Diagnosis Function

Method of starting

Hardware/software versions and speaker channel check

1. Turn the ignition ON.
2. Turn the audio system off.
3. While pressing the preset 1 button, turn the volume control dial clockwise or counterclockwise 30 clicks or more.

4. Initially, all display segments will be illuminated.

5. To exit hardware/software versions and speaker channel check, turn the ignition off.

Communication diagnosis

1. Turn the ignition on.
2. Turn the audio system off.
3. While pressing the preset 6 button, turn the volume control dial clockwise or counterclockwise 30 clicks or more.

4. Initially, the communication diagnosis mode is displayed.

5. To exit communication diagnosis, turn the ignition off.

Self diagnosis mode

Hardware/software versions

1. Press the disp button to enter versions display, and the audio head unit software version is displayed.

2. With each additional press of the disp button, the following information is available:

• Hard v###### (hardware version)
• Eep v###### (eeprom version)
• @@@@ Eq1-4 # (eq pin info)

If an eq error is present, invalid eq is displayed

3. Hold the disp button down to return to all display segments screen.

Speaker channel check

1. Press the rpt/drm button to enter speaker channel check, and the front left tweeter (front tweeter lh) is displayed.

2. With each additional press of the RPT/DRM button, the following information is available:

• Fr right tweeter (front tweeter rh)
• Fr right (front door speaker rh)
• RR RIGHT (rear speaker RH)
• Rr left (rear speaker lh)
• Fr left (front door speaker lh)

3. Hold the rpt/drm button down to return to all display segments screen.

Communication diagnosis

1. Press the disp button, and the m-can message transmission error history screen is displayed.

2. Press the disp button again, and the tel $$ nn (cmf message reception error history from m-can tel) screen is displayed.
3. Press the disp button again, and the trouble del. (Deletion of m-can message communication history) screen is displayed. To retain the m-can message communication history and return to the communication diagnosis mode screen, press the disp button.
4. To proceed to the m-can message communication history deletion screen, press the seek/track button. The rec del-no? (Selection of m-can message communication history deletion) screen is displayed.

   To cancel m-can message communication history deletion, wait 6 seconds and you will be returned to the trouble del. (Deletion of m-can message communication history) screen. To proceed with m-can message communication history deletion, press the seek/track button again.

5. The REC DEL-YES?@ (selection of M-CAN message communication history deletion) screen is displayed.

   To cancel M-CAN message communication history deletion, press the SEEK/TRACK button
   and you will be returned to the REC DEL-NO? (selection of M-CAN message communication history deletion) screen. To proceed with M-CAN message communication history deletion, wait 6 seconds and the communication history deletion will be executed. After the communication history deletion has been executed, you will be returned to the TROUBLE DEL. (deletion of M-CAN message communication history) screen. To return to the communication diagnosis mode screen, press the DISP button.

Diagnosis system (bluetoothВ® control unit)

Diagnosis description

The BluetoothВ® 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.

BluetoothВ® control unit initialization checks

• Internal control unit failure
• BluetoothВ® 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)
• BluetoothВ® inquiry check

Operation procedure

1. Turn ignition switch to acc or on.
2. Wait for the bluetoothВ® system to complete initialization. This may take up to 20 seconds.
3. Press and hold the steering wheel audio control switch
   (phone/send) button for at least 5 seconds. The bluetoothВ® system will begin to play a verbal prompt.

4. 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.
5. While the beep is sounding, press and hold the steering wheel audio control switch (PHONE/END)
   button again until you hear prompts.
6. The BluetoothВ® system has now entered into the diagnostic mode. Results of the diagnostic checks will be verbalized to the technician. Refer to AV-19, "Work Flow".
7. 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-19, "Work Flow".

Work flow

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