Lexus NX: How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

HINT:

  • Use the following procedure to troubleshoot the power door lock control system.
  • *: Use the Techstream.

PROCEDURE

1.

VEHICLE BROUGHT TO WORKSHOP

NEXT

2.

CUSTOMER PROBLEM ANALYSIS CHECK

HINT:

  • In troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred.
  • Gather as much information as possible for reference. Past problems that seem unrelated may also help in some cases.
  • The following 5 items are important points for problem analysis:

What

Vehicle model, system name

When

Date, time, occurrence frequency, whether the problem occurred recently or has been occurring for a long time

Where

Whether the problem occurs at a specific location

Under what conditions?

Whether the doors were locked or unlocked, whether the power switch was on (IG), whether the hybrid control system has started

How did it happen?

Problem symptoms

NEXT

3.

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 before proceeding to the next step.

(b) Check the fuses and relays.

(c) Check the connector connections and terminals to make sure that there are no abnormalities such as loose connections, deformation, etc.

NEXT

4.

INSPECT COMMUNICATION FUNCTION OF LIN COMMUNICATION SYSTEM*

(a) Using the Techstream, check for LIN communication system DTCs.

Click here

Result

Proceed to

LIN DTCs are not output

A

LIN DTCs are output

B

B

GO TO LIN COMMUNICATION SYSTEM

A

5.

CHECK FOR DTC (POWER WINDOW CONTROL SYSTEM)*

(a) Clear the DTCs.

Click here

Body Electrical > Master Switch > Clear DTCs

(b) Recheck for DTCs.

Body Electrical > Master Switch > Trouble Codes

Result

Proceed to

DTC B2312 is not output

A

DTC B2312 is output

B

B

GO TO POWER WINDOW CONTROL SYSTEM

A

6.

CHECK FOR DTC*

(a) Clear the DTCs.

Click here

Body Electrical > Main Body > Clear DTCs

(b) Recheck for DTCs.

Body Electrical > Main Body > Trouble Codes

Result

Proceed to

DTC B1243 is not output

A

DTC B1243 is output

B

B

GO TO DIAGNOSTIC TROUBLE CODE CHART

A

7.

PROBLEM SYMPTOMS TABLE

(a) Refer to Problem Symptoms Table.

Click here

Result

Proceed to

Fault is not listed in Problem Symptoms Table

A

Fault is listed in Problem Symptoms Table

B

B

ADJUST, REPAIR OR REPLACE IN ACCORDANCE WITH PROBLEM SYMPTOMS TABLE

A

8.

OVERALL ANALYSIS AND TROUBLESHOOTING*

(a) Terminals of ECU

Click here

(b) Data List / Active Test

Click here

(c) Operation Check

Click here

(d) Inspection

NEXT

9.

REPAIR OR REPLACE

NEXT

10.

CONFIRMATION TEST

NEXT

END

READ NEXT:

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