Unit Check

Some of the tests and screens that are displayed under the Unit Check are different from the more detailed checks listed under other menu options.

To start the test, select the item you want to check.

• ECU Info
• GPS
• Display
• Remote Tuner
• SiriusXM (with XM)
• HFL
• Carplay Box
• CD Mech
• Rear Camera
• B-CAN
• Mic/STRG
• USB
• Car Status
• Hard Key
• Speaker Check

Courtesy of HONDA, U.S.A., INC.

ECU Info 

This screen displays for information in the audio ECU.

• Serial No.: Displays the audio unit serial number. That should be the same as the serial number found on the upper side of the audio unit.
• Coverage: Displays the destination market of the audio unit.
• Model: For this vehicle and trim level, the field should begin with TX6.

Courtesy of HONDA, U.S.A., INC.

GPS 

This diagnosis checks the GPS antenna connection and the GPS receiver condition.

• If Antenna shows NG, the GPS antenna is disconnected or open/short in the wire between the GPS antenna and the audio unit.
• If Receiver in Audio ECU shows NG, replace the audio unit .
• Select Information to see the GPS satellite details.

Courtesy of HONDA, U.S.A., INC.

Display 

This diagnosis does additional checks on the GA-NET bus between the audio unit and the center display unit. This test also checks the internal electronic functions.

• If Connection shows NG, the GA-NET bus connection may be open or short between the center display unit and the audio unit.
• Version: Displays the center display unit software version.
• If ROM or RAM shows NG, replace the center display unit .

Courtesy of HONDA, U.S.A., INC.

Remote Tuner 

NOTE:  For factory use only. Do not alter any settings unless directed.

This diagnosis shows the external radio tuner (AM/FM) status. Make sure the audio unit radio tuner is turned on and the AM or FM source is selected.

• Current Frequency can be changed by selecting TUNE.
• Source can be changed in this order: AM->FM by selecting Change.
• Electric Field Intensity: Displays radio reception sensitivity (dBμV).
• ANT +B: Changes the AM/FM antenna power status ON or OFF.
• RDS BER: Displays the number of RDS error that is receiving.
• F-Check: Changes the station list automatic updating operation status ON or OFF.
• Antenna: If the vehicle has diversity antenna, you can select the radio antenna function from Auto, Main, Sub, or PD (diversity).
• Version: Displays the tuner unit software version.
• Serial No.: Displays the tuner unit serial number.
• Part No.: Displays the tuner unit parts number.
• Database Clear: The Station list in the tuner unit can be cleared by selecting Clear.
• HD Function: Changes the HD RADIO (TM) function status YES or NO.
• RS485: If RS485 shows NG, the RS485 connection may be open or short between the tuner unit and the audio unit.

Courtesy of HONDA, U.S.A., INC.

SiriusXM (With XM) 

This diagnosis checks the XM receiver condition. the XM receiver has been integrated with the tuner unit.

• If GA-NET and/or RS485 shows NG, go to XM radio display is blank and no station information is displayed troubleshooting .
• If Antenna shows NG, go to Error code: Check Antenna is displayed troubleshooting .
• If the GA-NET and the RS485 are OK, the Channel graphic reset function is available. Delete the channel graphic that is stored in the audio unit by pressing the Reset.

Courtesy of HONDA, U.S.A., INC.

HFL 

This diagnosis checks first whether the HandsFreeLink control unit is connecting to the audio unit via the GA-NET bus.

• If HFL shows B1792, go to the HFL DTC B1792 troubleshooting .
• If HFL and GA-NET shows NG, go to HFL does not respond troubleshooting .
• If USB shows NG, go to Phone book, TXT/E-mail does not work troubleshooting .

  NOTE:  USB in this instance is referring to the HFT USB communication bus protocol between the HandsFreeLink control unit and the audio unit. It is not related to the USB port for the audio unit.

• Physical Address: Displays the HandsFreeLink control unit physical address (8E).
• S/W Version: Displays the HandsFreeLink control unit software version.
• Part Number: Displays the HandsFreeLink control unit parts number.
• Reflash: Do not use this selection on this vehicle.

Courtesy of HONDA, U.S.A., INC.

Carplay Box 

This diagnosis shows the CarPlay and Android Auto unit status.

• If CP/AA Connection and/or HDMI shows NG, go to CarPlay and Android Auto unit does not work troubleshooting .
• S/W Version: Displays the eMMC software version in the CarPlay and Android Auto unit.
• Flash Version: Displays the Nor-Flash version in the CarPlay and Android Auto unit.
• Serial No.: Displays the CarPlay and Android Auto unit serial number.
• Mic Check: Select the Start to doing the diagnosis, make a loud noise like clapping your hands in front of the HFL microphone in the roof console, and check if the loop-back sound is heard from the vehicle's speaker.
• Guidance Check: When you select Start, the system output electrical sound.

Courtesy of HONDA, U.S.A., INC.

CD Mech 

This diagnosis checks the audio unit internal CD player mechanism.

Version shows CD mech version. When the audio unit can read the version number, Connection shows OK. If the version number cannot be read, Connection shows NG.

• Inserting the CD mech update disc allows you to select Download. Otherwise it is grayed out.
• To update the CD mech, you must insert the update disc before selecting this screen. If you insert the update disc when you are on this diagnosis, the DownLoad stays grayed out. In this case, exit the CD Mech screen and start the diagnosis again.

Courtesy of HONDA, U.S.A., INC.

Rear Camera 

This diagnosis checks the rearview camera connection.

• If Connection shows NG, the connection may be open between the rearview camera and the audio unit.
• If Connection shows OK, press the SETTINGS button to display the rearview camera image. To return to the previous screen, press the SETTINGS button again.

Courtesy of HONDA, U.S.A., INC.

B-CAN 

NOTE:  This diagnosis must have the engine running.

This diagnosis checks whether the audio unit has received specific B-CAN data. If ERROR STATUS shows NO ERROR, an error is not detected between the B-CAN bus and the audio unit.

• If ERROR STATUS shows RAM ERROR, replace the audio unit .
• If the audio unit detects the B-CAN data reception error, ERROR Status shows RX ERROR.
• If ERROR STATUS shows TIME OUT, There is a possibility that some items are NG (red icon). When all the items from each transmitting unit is NG, check for B-CAN DTCs with the HDS. If the DTCs not detected, check for continuity in the B-CAN lines between the audio unit and the transmitting unit.

Target ID for Connection Check	Transmitting Unit
ACINFO	Climate control unit
MICU_ICU	MICU
ILLUMI	Gauge control module

Courtesy of HONDA, U.S.A., INC.

Mic/STRG SW 

This diagnosis checks whether the microphone is connecting to the HandsFreeLink control unit, and checks whether the HFL switch is communicating with the audio unit.

• If Mic shows HFL DTCs (B1775 or B1776), go to the indicated HFL DTC troubleshooting.
• If Mic shows NG, the GA-NET bus connection may be open or short between the HandsFreeLink control unit and the audio unit.

Press the PICK-UP, HANG-UP/BACK, and TALK buttons. As each button is pressed, the corresponding icon on the display should turn green.

• If any icon does not briefly turn green, substitute a known-good audio remote-HFL switch , and recheck.
• If all the icons do not turn green, go to HFL switch does not work properly troubleshooting .

Courtesy of HONDA, U.S.A., INC.

USB 

NOTE:  Not all USB memory drives are compatible. See the Owner's Manual for more information.

This diagnosis displays the USB memory device status when a USB memory device is connected to the USB port.

If a USB memory device is connected to the USB port, the screen displays the connection status (Inserted/Not Inserted), the USB memory size, and the Product ID, Vender ID.

Courtesy of HONDA, U.S.A., INC.

Car Status 

Use this screen to confirm that the audio unit is properly receiving input signals. The displayed value changes each time according to the state of input signal.

Item	Input	Description
VSP	B-CAN lines	1: When the vehicle is moving 0: When the vehicle is stopped
BACK	BACK LT line	1: When the transmission is shifted to R position/mode 0: When the transmission is shifted to any position/mode other than R position/mode

Item	Input	Description
ILL	B-CAN lines (from gauge control module)	1: When parking lights, or headlights are on 0: When parking lights, or headlights are off
ILL CANCEL	B-CAN lines	1: When the dashlights brightness control is more than 90 % brightness with the parking lights turned on 0: When the dashlights brightness control is less than 90 % brightness with the parking lights turned on
PARK	B-CAN lines	1: When the parking brake is applied 0: When the parking brake is not applied
IGNITION	B-CAN lines	1: When the vehicle is in the ON mode 0: When vehicle is in the ACCESSORY mode
ILL DUTY	B-CAN lines (from gauge control module)	With the parking lights on, use the dashlights brightness control to dim and brighten the gauge control module. The value changes from 1 (max low) to 22 (max high).
RECEIVED VIN NO	B-CAN lines	This item indicates the VIN that are received from the PCM.
INTERNAL REGISTRATION VIN NO	B-CAN lines	This item indicates the initial registration VIN that is saved in the audio unit.
ADDITIONAL REGISTRATION VIN NO	B-CAN lines	This item indicates the additional registration VIN when the audio unit is substituted into another vehicle, or when a PCM is substituted or replaced into this vehicle.

Courtesy of HONDA, U.S.A., INC.

Hard Key 

This diagnosis tests the interface dial, center switch panel buttons that surround it, and the audio remote-HFL switch.

To complete the each test, control the audio remote-HFL switch, press the center switch panel buttons, and move the interface dial to each indicated position. As each function is tested, the corresponding button on the display should highlight. To exit, press in and hold the interface dial knob.

If the test cannot be completed, the corresponding icon on the Hard Key menu screen shows red.

• Steering Key: Checks the audio remote-HFL switch buttons and the selector wheel.
• Hard Key: Checks the center switch panel buttons and the interface dial.

NOTE:  You cannot use the onscreen return button to exit this function.

Courtesy of HONDA, U.S.A., INC.

Select Steering Key 

Courtesy of HONDA, U.S.A., INC.

Select Hard Key 

Courtesy of HONDA, U.S.A., INC.

Speaker Check 

NOTE:  While doing the diagnosis, the fader and the balance positions are set to the center.

This diagnosis checks the audio speakers individually.

Selects NEXT or BACK to select Speaker. A tone should sound from the speaker.

When you select NEXT, the system checks the speakers in this order: -> -> -> -> -> -> -> ->

When you select BACK, the system checks the speakers in this order: -> -> -> -> -> -> -> ->

	Display Message	Vehicle Test Condition
	FR L	You should hear a tone from the driver's door speaker

	Display Message	Vehicle Test Condition
	FR R	You should hear a tone from the front passenger's door speaker
	RR R	You should hear a tone from the right rear door speaker
	SWF	You should hear a tone from the subwoofer
	RR L	You should hear a tone from the left rear door speaker
	FRTW L	You should hear a tone from the left tweeter
	FRTW R	You should hear a tone from the right tweeter
	ALL	You should hear a tone from all speakers

Courtesy of HONDA, U.S.A., INC.