Lexus NX: How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

PROCEDURE

1.	VEHICLE BROUGHT TO WORKSHOP

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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)".

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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

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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.

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Body Electrical > Air Conditioner > Trouble Codes

(b) Clear the DTCs.

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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.

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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.

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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

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8.	ADJUST, REPAIR OR REPLACE

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END

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