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
• Display
• SiriusXM (With XM)
• HFL
• Rear Camera (Without MVCS)
• MVCS (With MVCS)
• B-CAN
• GPS
• Remote Tuner
• TCU (With AcuraLink)
• CD/DVD Mech
• F-CAN
• Mic/STRG
• AMP
• HDD
• Yaw Sensor
• Hard Key
• Speaker Check
• HD-TMC
• USB
• Car Status
• Error History
• CarPlay Box

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ECU Info 

This diagnosis checks for problems in the navigation ECU. When you start this diagnosis, the audio-navigation unit may freeze or delay up to a minute while the diagnosis runs.

• D-RAM: Displays the result of the access to the D-RAM (OK/NG).
• • To check the D-RAM, select D-RAM Check, then select Yes on the confirmation screen. While checking, do not turn the vehicle to the ACCESSORY mode or the OFF (LOCK) mode. The system resets automatically.
  • Recheck the ECU Info diagnosis. If D-RAM shows NG, replace the audio-navigation unit .
• Program (Flash, HDD, DVD): Displays the version of the each software.
• Serial No.: Displays the audio-navigation unit serial number. That should be the same as the serial number found on the upper side of the audio-navigation unit.

  NOTE:  If the serial number displayed does not match the serial number found on the upper side of the audio-navigation unit, the annual navigation map update activation key may not work when updating the navigation map. In order for a navigation map update activation key to work, both number must match.

• DB Version: Displays the version of the database in the HDD.
• HDD Version: Displays the version of the HDD.
• Flash: Displays the result of the access to the flash memory (OK/NG). If NG, replace the audio-navigation unit .
• Model: For this vehicle and trim level, the field should begin with TZ3.
• Coverage: Displays the destination market of the audio-navigation unit.

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Display 

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

• If Connection shows NG, Check for hard error codes - Refer to: How To Troubleshoot The Navigation System (Without Auto Idle Stop System) (2015-17)  or How To Troubleshoot The Navigation System (With Auto Idle Stop System) (2015-17)  or How to Troubleshoot the Navigation System (2018-19) .
• Version: Displays the software version of the center display unit.
• If ROM or RAM shows NG, replace the center display unit .

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SiriusXM (With XM) 

This diagnosis displays the SiriusXM status.

If GA-NET, Antenna, and/or RS485 shows NG, check for hard error codes - Refer to: How To Troubleshoot The Navigation System (Without Auto Idle Stop System) (2015-17)  or How To Troubleshoot The Navigation System (With Auto Idle Stop System) (2015-17)  or How to Troubleshoot the Navigation System (2018-19) .

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HFL 

This diagnosis checks first whether the telematics control unit or the HandsFreeLink control unit is connecting to the audio-navigation unit via the GA-Net bus. With AcuraLink, HandsFreeLink control unit is built into the telematics control unit.

• If HFL shows B1792, go to the HFL DTC B1792 troubleshooting .
• If HFL and GA-NET shows NG, refer to: HFL DOES NOT RESPOND (WITH NAVIGATION) .
• If USB shows NG:

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

• • Without AcuraLink, refer to: PHONE BOOK, TXT/E-MAIL DOES NOT WORK (WITHOUT NAVIGATION) .
  • With AcuraLink, check for hard error codes - Refer to: How To Troubleshoot The Navigation System (Without Auto Idle Stop System) (2015-17)  or How To Troubleshoot The Navigation System (With Auto Idle Stop System) (2015-17)  or How to Troubleshoot the Navigation System (2018-19) .
• Physical Address: Displays the telematics control unit or the HandsFreeLink control unit physical address (8E).
• S/W Version: Displays the telematics control unit or the HandsFreeLink control unit software version.
• Part Number: Displays the telematics control unit or the HandsFreeLink control unit parts number.

Check any official Honda service website to see if there are any updates available for the telematics unit or the HandsFreeLink control unit. If there are software updates available, do the Telematics Control Unit Update or the HandsFreeLink Control Unit Update .

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Rear Camera (Without MVCS) 

This diagnosis checks the rearview camera connection.

• If Connection shows NG, check for hard error codes - Refer to: How To Troubleshoot The Navigation System (Without Auto Idle Stop System) (2015-17)  or How To Troubleshoot The Navigation System (With Auto Idle Stop System) (2015-17)  or How to Troubleshoot the Navigation System (2018-19) .
• 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.

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MVCS (With MVCS) 

This diagnosis checks the multi view camera unit connection.

• If Connection shows NG, check for hard error codes - Refer to: How To Troubleshoot The Navigation System (Without Auto Idle Stop System) (2015-17)  or How To Troubleshoot The Navigation System (With Auto Idle Stop System) (2015-17)  or How to Troubleshoot the Navigation System (2018-19) .
• If Connection shows OK, press the CAMERA button to display the multi view camera image. To return to the previous screen, press the CAMERA button again.

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B-CAN 

NOTE:  This diagnosis must have the engine running.

This diagnosis checks whether the audio-navigation 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-navigation unit.

• If ERROR STATUS shows RAM ERROR, replace the audio-navigation unit .
• If the audio-navigation 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 DTCs not detected, check for continuity in the B-CAN lines between the audio-navigation unit and the transmitting unit.

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GPS 

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

• If Antenna shows NG, check for hard error codes - Refer to: How To Troubleshoot The Navigation System (Without Auto Idle Stop System) (2015-17)  or How To Troubleshoot The Navigation System (With Auto Idle Stop System) (2015-17)  or How to Troubleshoot the Navigation System (2018-19) .
• If Receiver in Navi ECU shows NG, replace the audio-navigation unit .
• Select Information to see the GPS satellite details.

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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-navigation 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 (with XM): If RS485 shows NG, check for hard error codes - Refer to: How To Troubleshoot The Navigation System (Without Auto Idle Stop System) (2015-17)  or How To Troubleshoot The Navigation System (With Auto Idle Stop System) (2015-17)  or How to Troubleshoot the Navigation System (2018-19) .

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TCU (With AcuraLink) 

This diagnosis shows the telematics control unit information via the USB between the audio-navigation unit and the telematics control unit.

• Drawing Number: Displays the telematics control unit drawing number.
• Serial Number: Displays the telematics control unit serial number. That should be the same as the serial number found on the upper side of the telematics control unit.
• S/W Version: Displays the telematics control unit software version.
• VIN: Displays the VIN number that received from the B-CAN.
• IMSI: Displays the International Mobile Subscriber Identity (MAX 15 digits)
• Phone Module: Displays the phone module status (Active or Deactive)
• PRL Version: Displays the Preferred Roaming List version

These diagnosis checks the telematics control unit status.

• DTCs: Checks the telematics system DTCs. Go to AcuraLink General Troubleshooting Information .
• TEL Info: Displays the phone module information.
• Log: Displays the event log data (Type, Data, Time, Code) of the telematics control unit.
• Test: Checks the SMS function. Go to AcuraLink Self-Diagnostic Function .
• Reflash: Do not use this selection on this vehicle.

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TEL Info 

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TCU Log 

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CD/DVD Mech 

This diagnosis checks the audio-navigation unit internal CD/DVD player mechanism.

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

• Inserting the CD/DVD mech update disc allows you to select Download. Otherwise it is grayed out.
• To update the CD/DVD 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/DVD Mech screen and start the diagnosis again.

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F-CAN 

NOTE:  This diagnosis must have the engine running.

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

• If ERROR STATUS shows RAM ERROR, replace the audio-navigation unit .
• If the audio-navigation unit detects the F-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 F-CAN DTCs with the HDS. If DTCs not detected, check for continuity in the F-CAN lines between the audio-navigation unit and the transmitting unit.

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Mic/STRG SW 

This diagnosis checks whether the microphone is connecting to the telematics control unit or the HandsFreeLink control unit, and checks whether the HFL switch is communicating with the audio-navigation 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. Check for hard error codes - Refer to: How To Troubleshoot The Navigation System (Without Auto Idle Stop System) (2015-17)  or How To Troubleshoot The Navigation System (With Auto Idle Stop System) (2015-17)  or How to Troubleshoot the Navigation System (2018-19) .

When Mic shows OK, 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, refer to: AUDIO REMOTE-HFL SWITCH DOES NOT WORK (ODMD (TM) (TOUCH SCREEN) AND CENTER SWITCH BUTTONS WORK) (WITH NAVIGATION) .

If you check the Mic Level, press the TALK button on the steering wheel, wait until Now Recording! is indicated, and in a normal voice say "testing". The Mic Level indicator on the screen should momentarily turn green. If there is no Mic Level movement when you speak, check for hard error codes - Refer to: How To Troubleshoot The Navigation System (Without Auto Idle Stop System) (2015-17)  or How To Troubleshoot The Navigation System (With Auto Idle Stop System) (2015-17)  or How to Troubleshoot the Navigation System (2018-19) .

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AMP 

This diagnosis checks the stereo amplifier connection.

If Connection shows NG, refer to: NO SOUND IS HEARD FROM ALL THE SPEAKERS (DISPLAY IS NORMAL) (WITH NAVIGATION) .

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HDD 

This diagnosis checks the HDD mount error and the HDD temperature, and displays a list of total and free capacities of each partition.

If HDD Status shows NG, check for hard error codes - Refer to: How To Troubleshoot The Navigation System (Without Auto Idle Stop System) (2015-17)  or How To Troubleshoot The Navigation System (With Auto Idle Stop System) (2015-17)  or How to Troubleshoot the Navigation System (2018-19) .

NOTE:  If HDD Status shows NG, the screen may not show the free and total capacities of each partition and the temperature.

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Yaw Sensor 

This diagnosis checks the gyro in the audio-navigation unit. This device detects what the vehicle turns, and repositions the vehicle position icon on the map screen. For more information, see the Yaw Rate diagnosis.

• If Zero Point Output shows NG, replace the audio-navigation unit .
• If Zero Point Output shows NO CHECK, the diagnosis condition has not set up because any judgment has never performed since the navigation is booted.
• Output Value: Indicates the average angular velocity value used for the diagnosis.
• Current Offset: Indicates the current angular velocity value from the yaw sensor.
• Temperature in ECU: Indicates the temperature of the navigation ECU.

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Hard Key 

This diagnosis tests the interface dial, the center switch panel buttons that surround it, and the audio remote-HFL switch. For this model, the audio remote-HFL switch buttons use the BATT LIN data bus via B-CAN from the gauge control module for communications.

To complete the each test, control the audio remote/HFL-navigation voice control 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.

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Select Steering Key 

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Select Hard Key 

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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
	CTR	You should hear a tone from the front center speaker
	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 front tweeter
	FRTW R	You should hear a tone from the right front tweeter
	SUR L	You should hear a tone from the left rear speaker
	SUR R	You should hear a tone from the right rear speaker
	ALL	You should hear a tone from all speakers

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HD-TMC 

This diagnosis displays the HD-TMC status.

• Frequency: Displays the frequency receiving at this time.
• HD Reception: Displays the receiving status of HD-TMC.
• Station Name: Displays the receiving station name.
• Service Bitmap: Displays the providing services.
• FCC Country Code: Displays the broadcasting station's country code.
• FCC Facility ID: Displays the broadcasting station's ID.
• Field Strength: Displays radio reception sensitivity (dBμV).
• HD-TMC Message Packet Counter: Displays the number of received message packets.
• Station List Count: Displays the receivable list of station.

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USB Memory Information 

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 audio-navigation unit.

• 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.
• If Connection shows NG, check for hard error codes - Refer to: How To Troubleshoot The Navigation System (Without Auto Idle Stop System) (2015-17)  or How To Troubleshoot The Navigation System (With Auto Idle Stop System) (2015-17)  or How to Troubleshoot the Navigation System (2018-19) .

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Car Status 

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

Item	Input	Description
VSP	VSP line	1: When the vehicle speed pulse is received from the PCM 0: When the vehicle speed pulse is not received from the PCM
ILL	B-CAN lines (from gauge control module)	1: When parking lights, or headlights are on 0: When parking lights, or headlights are off
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 ON mode 0: When vehicle is in ACCESSORY mode
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
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
REAR DEF	B-CAN lines	1: When the rear window defogger is working 0: When the rear window defogger is not working
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. The value changes from 1 (max low) to 22 (max high).
FOB	B-CAN lines	0 to 2 (display notification ID)
RECEIVED VIN NO	B-CAN lines	This item indicates the VIN that received from the PCM.
INTERNAL REGISTRATION VIN NO	B-CAN lines	This item indicates the initial registration VIN that is saved in the audio-navigation unit.
ADDITIONAL REGISTRATION VIN NO	B-CAN lines	This item indicates the additional registration VIN when the audio-navigation unit is substituted into another vehicle, or when a PCM is substituted or replaced into this vehicle.

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Error History 

If you select Hard Error or Soft Error, you can see the error information. Refer to How to Check for Error History - Refer to: How To Troubleshoot The Navigation System (Without Auto Idle Stop System) (2015-17)  or How To Troubleshoot The Navigation System (With Auto Idle Stop System) (2015-17)  or How to Troubleshoot the Navigation System (2018-19)  to use this diagnosis.

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CarPlay Box (CarPlay and Android Auto Unit) 

This diagnosis shows the CarPlay and Android Auto unit status.

• If CP/AA Connection and/or HDMI shows NG, check for hard error codes - Refer to: How To Troubleshoot The Navigation System (Without Auto Idle Stop System) (2015-17)  or How To Troubleshoot The Navigation System (With Auto Idle Stop System) (2015-17)  or How to Troubleshoot the Navigation System (2018-19) .
• 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: When you select Start, the system output mic sound.
• Guidance Check: When you select Start, the system output test sound.

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