Lexus NX: How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

HINT:

  • Use these procedures to troubleshoot the LIN communication system.
  • *: Use the Techstream.

PROCEDURE

1.

VEHICLE BROUGHT TO WORKSHOP

NEXT

2.

INSPECT AUXILIARY BATTERY VOLTAGE

(a) Measure the auxiliary battery voltage with the power switch off.

Standard voltage:

11 to 14 V

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

NEXT

3.

CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*

(a) Using the Techstream, check the CAN communication function to ensure that there are no malfunctions in the communication system.

Click here

DTCs output

GO TO CAN COMMUNICATION SYSTEM

No DTCs output

4.

CHECK COMMUNICATION FUNCTION OF LIN COMMUNICATION SYSTEM*

(a) Using the Techstream, check the LIN communication function to ensure that there are no malfunctions in the communication system.

DTCs output

GO TO DIAGNOSTIC TROUBLE CODE CHART

No DTCs output

5.

PROBLEM SYMPTOMS TABLE

(a) Refer to the Problem Symptoms Table.

Click here

Fault is listed in problem symptoms table

ADJUST, REPAIR OR REPLACE IN ACCORDANCE WITH PROBLEM SYMPTOMS TABLE

Fault is not listed in problem symptoms table

6.

OVERALL ANALYSIS AND TROUBLESHOOTING*

(a) Data List / Active Test

Click here

(b) Terminals of ECU

Click here

NEXT

7.

ADJUST, REPAIR OR REPLACE

NEXT

END

READ NEXT:

 Problem Symptoms Table

PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of the problem symptom. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order

 Terminals Of Ecu

TERMINALS OF ECU CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (a) Remove the main body ECU (multiplex network body ECU). Click here *1 Main Bo

 Dtc Check / Clear

DTC CHECK / CLEAR CHECK DTC (a) Check main body ECU (multiplex network body ECU) (1) Connect the Techstream to the DLC3. (2) Turn the power switch on (IG). (3) Turn the Techstream on. (4) Enter the fo

SEE MORE:

 Repair

REPAIR CAUTION / NOTICE / HINT HINT: Use the same procedure for the RH and LH sides. The procedure listed below is for the LH side. If the installation area of the headlight assembly is damaged, use the supply retainer for low-cost repair. Make sure that the headlight assembly is not damage

 Reassembly

REASSEMBLY CAUTION / NOTICE / HINT NOTICE: When using a vise, place aluminum plates between the part and vise. When using a vise, do not overtighten it. PROCEDURE 1. INSTALL POWER STEERING MOTOR ASSEMBLY NOTICE: Do not drop the power steering ECU with motor assembly, strike it with tools

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