Lexus NX: How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

HINT:

  • Use the following procedure to troubleshoot the air conditioning system.
  • *: Use the Techstream.

PROCEDURE

1.

VEHICLE BROUGHT TO WORKSHOP

NEXT

2.

INSPECT AUXILIARY BATTERY VOLTAGE

(a) Inspect 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 to the next step.

(b) Check the "Operation Limitation Control History Count (Level 1)" and "Operation Limitation Control History Count (Level 2)".

Click here

Body Electrical > Air Conditioner > Data List

Tester Display

Operation Limitation Control History Count (Level1)

Operation Limitation Control History Count (Level2)

HINT:

If a value other than zero is displayed for "Operation Limitation Control History Count (Level1)" or "Operation Limitation Control History Count (Level2)", PTC heater, seat heater system (w/ Seat Heater System) and climate control seat system (w/ Climate Control Seat System) operation may have been limited in the past. If the operation is still limited, the message "High Power Consumption Partial Limit On AC/Heater Operation." will be displayed on the multi-information display in the combination meter assembly. In this case, inspect the charging system.

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(c) Clear the "Operation Limitation Control History Count (Level 1)" and "Operation Limitation Control History Count (Level 2)".

Body Electrical > Air Conditioner > Utility

Tester Display

A/C Operation Limitation History Count Clear

NEXT

3.

CHECK COMMUNICATION FUNCTION OF LIN COMMUNICATION SYSTEM*

(a) Use the Techstream to check if the LIN communication system is functioning normally.

Result

Proceed to

LIN DTC is not output

A

LIN DTC is output

B

B

GO TO LIN COMMUNICATION SYSTEM

A

4.

CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*

(a) Use the Techstream to check if the CAN communication system is functioning normally.

Result

Proceed to

CAN DTC is not output

A

CAN DTC is output

B

B

GO TO CAN COMMUNICATION SYSTEM

A

5.

CHECK FOR DTC*

(a) Check for DTCs and note any codes that are output.

Click here

Body Electrical > Air Conditioner > Trouble Codes

(b) Clear the DTCs.

Click here

Body Electrical > Air Conditioner > Clear DTCs

(c) Recheck for DTCs. Based on the DTCs output above, try to force output of the air conditioning system DTC by simulating the operation indicated by the DTC.

Click here

Body Electrical > Air Conditioner > Trouble Codes

Result

Proceed to

DTC is not output

A

DTC is output

B

B

GO TO DIAGNOSTIC TROUBLE CODE CHART

A

6.

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

7.

OVERALL ANALYSIS AND TROUBLESHOOTING*

(a) Data List / Active Test

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(b) Terminals of ECU

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(c) On-vehicle Inspection

(d) Inspection

NEXT

8.

ADJUST, REPAIR OR REPLACE

NEXT

END

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