Lexus NX: Diagnosis System

DIAGNOSIS SYSTEM

DESCRIPTION

The ECU stores DTCs when malfunctions occur.

The diagnostic system allows for reading of the DTCs from the DLC3.

Use the Techstream to check for malfunctions and perform repairs.

CHECK DLC3

(a) Check the DLC3.

Click here

INSPECT AUXILIARY BATTERY VOLTAGE

(a) Measure the auxiliary battery voltage.

Standard voltage:

11 to 14 V (power switch off)

If the voltage is below 11 V, recharge or replace the auxiliary battery.

SELF-DIAGNOSTIC MODE (USING TECHSTREAM)

(a) Connect the Techstream to the DLC3.

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

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Entry&Start / Utility / Wireless Door Lock Diagnosis Mode.

Body Electrical > Smart Access > Utility

Tester Display

Wireless Door Lock Diagnosis Mode

(e) Proceed to the next step in accordance with the prompts on the Techstream screen.

(f) Check that the system has switched to self-diagnostic mode by checking the wireless door lock buzzer output pattern.

(g) Check the diagnostic outputs when an electrical key transmitter sub-assembly switch is pressed. The diagnostic outputs can be checked by the interior light and wireless door lock buzzer patterns.

Result

Wireless Door Lock Buzzer Output

Suspected Area

A

Normal (No malfunction)

B

Register wireless code

C

Wave interference or malfunction of a related component

READ NEXT:

 Dtc Check / Clear

DTC CHECK / CLEAR CHECK DTC (a) Connect the Techstream to the DLC3. (b) Turn the power switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / Smart Access / Troub

 Data List / Active Test

DATA LIST / ACTIVE TEST DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. Th

 Diagnostic Trouble Code Chart

DIAGNOSTIC TROUBLE CODE CHART Wireless Door Lock Control System DTC No. Detection Item Link B1242 Wireless Door Lock Tuner Circuit Malfunction

SEE MORE:

 Removal

REMOVAL PROCEDURE 1. PRECAUTION NOTICE: Be sure to read Precaution thoroughly before servicing. Click here Handle components indoors as much as possible to prevent foreign matter from entering and adhering to headlight assembly components. Do not reuse parts which have reduced fastening abi

 Calibration

CALIBRATION SELECT COMPASS DISPLAY MODE (w/ Compass) (a) The compass switch allows selection of the compass display. *1 Compass Display *2 Compass Switch PERFORM CALIBRATION (w/ Compass) (a) The compass indicates the direction that the vehicle is heading by detecting the direction and

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