Lexus NX: Dtc Check / Clear

DTC CHECK / CLEAR

CHECK DTC (CHECK USING Techstream)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG) and wait for 90 seconds.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Navigation System / Trouble Codes.

Body Electrical > Navigation System > Trouble Codes

(e) Check for DTCs, and then write them down.

(f) Check the details of the DTC(s).

Click here

CLEAR DTC (CLEAR USING Techstream)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG) and wait for 90 seconds.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Navigation System / Clear DTCs.

Body Electrical > Navigation System > Clear DTCs

(e) Clear the DTCs.

START DIAGNOSTIC MODE

(a) Method 1:

(1) Turn the power switch on (IG).

(2) While pressing and holding the "MENU" switch, operate the light control switch: Off → Tail → Off → Tail → Off → Tail → Off.

*a	"MENU" Switch

(3) Diagnostic mode starts and the "Service Menu" screen will be displayed. Service inspection starts automatically and the result will be displayed.

(b) Method 2:

(1) Turn the power switch on (IG).

(2) Turn the multi-display assembly screen display off.

(3) Turn the radio receiver assembly power supply off.

(4) Perform the "left to right flick" operation on the touch pad 5 times as shown in the illustration.

(5) Perform the "right to left flick" operation on the touch pad 5 times as shown in the illustration.

(6) Diagnostic mode starts and the "Service Menu" screen will be displayed. Service inspection starts automatically and the result will be displayed.

(c) Method 3:

(1) Connect the Techstream to the DLC3.

(2) Turn the power switch on (IG).

(3) Turn the Techstream on.

(4) Enter the following menus: Body Electrical / Navigation System / Utility / Diagnostic Mode.

Body Electrical > Navigation System > Utility

Tester Display
Diagnostic Mode

(5) Diagnostic mode starts and the "Service Menu" screen will be displayed. Service inspection starts automatically and the result will be displayed.

(d) Method 4:

NOTICE:

If the operation fails and diagnostic mode cannot be entered, turn the multi-display assembly screen display on and off once, and then perform the procedures listed below from the first step again. (Only turning the radio receiver assembly power supply on and off will not work.)

(1) Turn the power switch on (IG).

(2) Turn the multi-display assembly screen display off.

(3) Turn the radio receiver assembly power supply off.

(4) Press the ">" switch 5 times, and then press the "<" switch 5 times within 15 seconds.

(5) Diagnostic mode starts and the "Service Menu" screen will be displayed. Service inspection starts automatically and the result will be displayed.

FAILURE DIAGNOSIS

(a) The "Failure Diagnosis" screen will be displayed by pressing the "Failure Diagnosis" switch on the "Service Menu" screen.

SYSTEM CHECK

(a) The "System Check Mode" screen will be displayed by selecting "System Check" on the "Failure Diagnosis" screen.

CHECK DTC (CHECK USING SYSTEM CHECK MODE SCREEN)

(a) System check mode screen description

Screen Description

Display	Content
*a: Node Position Number for Devices Connected to MOST Network	MOST network node position numbers are provided for devices connected to the MOST network.
*b: Device Name List No. 1	Device Name List No. 1 displays some of the devices that make up the navigation system. The names of the components from Device Name List No. 1 are shown in the following table.
*c: Check Result	Result codes for all devices are displayed. When "MOST" is displayed for the result, select "MOST" on the multi-display assembly to display the "MOST Line Check" screen.
*d: Memory Clear	Present and history DTCs and registered connected device names are cleared. Select "Memory CLR" for 3 seconds.
*e: Recheck	A system check will be performed again after the memory is cleared. "Recheck" will dim during a system check.
*f: Device Name List No. 2	Device Name List No. 2 displays some of the devices that make up the navigation system. The names of the components from Device Name List No. 2 are shown in the following table.

*b: Device Name List No. 1 Description

Name	Component	Connection Method
*1: w/ Parking Assist Monitor System and w/o Intuitive Parking Assist System *2: w/ Parking Assist Monitor System and w/ Intuitive Parking Assist System *3: w/ Panoramic View Monitor System
DCU	Radio Receiver Assembly	-
AMP	Stereo component amplifier assembly	Communication line for MOST network
DISP	Multi-display assembly	Communication line for AVC-LAN
MEU	Navigation ECU	Communication line for USB
CLOCK	Clock assembly	Local bus communication line
R-TOUCH	Remote operation controller assembly (remote touch)	Local bus communication line
CAA*1	Television camera assembly	CAN communication line
CAMERA-C*2	Television camera assembly	CAN communication line
CAMERA-M*3	Parking assist ECU	CAN communication line

*c: Check Result Description

Result	Meaning	Action
OK	The device does not respond with a DTC.	-
MOST	MOST communication error	Perform "MOST Line Check" to check the connection of each device on the MOST network.
DETAIL	The device responds with a DTC.	Look up the DTC in "Unit Check Mode".
NCON	The device was previously present, but does not respond in diagnostic mode.	- Check power supply wire harness of the device. - Check the AVC-LAN or MOST network of the device.
NRES	The device responds in diagnostic mode, but gives no DTC information.	- Check power supply wire harness of the device. - Check the AVC-LAN or MOST network of the device.

*f: Device Name List No. 2 Description

Name	Component	Connection Method
*: w/ Manual (SOS) Switch
DCM*	DCM (telematics transceiver)	Communication line for USB
AUX/VTR	No. 1 stereo jack adapter assembly	Vehicle wire harness
IF-BOX_ USB	No. 1 stereo jack adapter assembly	Communication line for USB

(b) Unit check mode screen description

Screen Description

Display	Content
*a: Device name	Target device
*b: History DTC	Diagnostic memory results and stored DTCs are displayed.
*c: Present DTC	DTCs output in the service check are displayed.
*d: DTC	DTC (Diagnostic Trouble Code)
*e: Timestamp	The time and date of history DTCs are displayed. (The year is displayed in 2-digit format.)
*f: Diagnosis clear switch	Selecting "Code CLR" for 3 seconds clears the diagnostic memory data of the target device. (Both diagnostic system check result and the displayed data are cleared.)

(c) MOST line check screen description

Screen Description

Display	Content
*a: Node Position Number for Devices Connected to MOST Network	MOST node position numbers are provided for devices connected to the MOST network.
*b: Device Name List	Device Name List displays some of the devices that make up the navigation system. The names of the components from Device Name List are shown in the following table.
*c: Check Result	The master unit displays the check result on the screen based on the response information from each slave unit.

*b: Device Name List

Name	Component
DCU	Radio receiver assembly
AMP	Stereo component amplifier assembly

*c: Check Result

Result	Meaning
OK	There was a response for the connection check during the MOST line check.
NCON	There was no response for the connection check during the MOST line check.

HINT:

The device name and result will not be displayed if there is no system registration record and no response for the connection check during the MOST line check even if the device is connected to the MOST network.

(d) Read the system check result.

(1) If the check result is "DETAIL", select the displayed check result to view the results on the "Unit Check Mode" screen and record them.

NOTICE:

A maximum of 6 DTCs can be displayed for history and present DTCs on the "Unit Check Mode" screen. Therefore, when 6 DTCs are displayed, troubleshoot those DTCs first and then check the "Unit Check Mode" screen again to see if any other DTCs are displayed.

(2) Check the details of the DTC(s).

Click here

NOTICE:

The navigation system outputs DTCs for the following system. When DTCs other than those in Diagnostic Trouble Code Chart for the navigation system are output, refer to Diagnostic Trouble Code Chart for the relevant system.

System	Proceed to
*1: w/ Parking Assist Monitor System *2: w/ Panoramic View Monitor System *3: w/ Manual (SOS) Switch
Parking Assist Monitor System*1
Panoramic View Monitor System*2
Safety Connect System*3
Lexus Enform System*3

DTC CLEAR/RECHECK (CLEAR USING SYSTEM CHECK MODE SCREEN)

(a) Clear DTCs

(1) Select "Memory CLR" for 3 seconds.

(2) Confirm that the check results are cleared.

(b) Recheck

(1) Press the "Recheck" switch.

(2) Confirm that all diagnostic codes are "OK" when the check results are displayed. If a result other than "OK" is displayed, perform troubleshooting again.

HINT:

When the DTCs are cleared using the "Unit Check Mode" screen, select "Back" to return to the "System Check Mode" screen and perform this operation.

FINISH DIAGNOSTIC MODE

(a) Turn the power switch off.

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