Lexus NX: How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

PROCEDURE

1.	VEHICLE BROUGHT TO WORKSHOP

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2.	CUSTOMER PROBLEM ANALYSIS

(a) Ask the customer about the problems and the conditions at the time the malfunction occurred to make sure the problem symptom was not temporarily caused by radio waves in the surrounding environment.

HINT:

The parking assist monitor display may be temporarily distorted due to radio waves around the vehicle.

Problem Symptom	Cause
*: DTCs output as "Hist" will not be output again after DTCs are cleared.
Both of the following conditions are met: The problem symptom indicates a parking assist monitor display malfunction and the problem symptom cannot be reproduced. DTC C1622 is output as "Hist" only.*	The display may be temporarily distorted when the vehicle is close to an object that transmits radio waves, such as a telecommunication tower, an airport or a truck equipped with a transceiver.

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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, replace or recharge the auxiliary battery before proceeding to the next step.

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4.	CHECK AUDIO AND VISUAL SYSTEM

(a) Refer to Audio and Visual System.

Click here

Result	Proceed to
Audio and visual system is normal	A
Audio and visual system is abnormal	B

B

GO TO AUDIO AND VISUAL SYSTEM

A

5.	CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*

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

Click here

Result	Proceed to
CAN communication system DTCs are not output	A
CAN communication system DTCs are output	B

B

GO TO CAN COMMUNICATION SYSTEM

A

6.	CHECK FOR DTC*

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

Click here

Chassis > Advanced Parking Guidance/Parking Assist Monitor > Trouble Codes Body Electrical > Navigation System > Trouble Codes

(b) Clear the DTCs.

Click here

Chassis > Advanced Parking Guidance/Parking Assist Monitor > Clear DTCs Body Electrical > Navigation System > Clear DTCs

(c) Check for DTCs. Try to prompt the DTC by simulating the original activity that the DTC suggests.

Click here

Chassis > Advanced Parking Guidance/Parking Assist Monitor > Trouble Codes Body Electrical > Navigation System > Trouble Codes

Result	Proceed to
No DTCs are output	A
DTCs are output	B

B

GO TO STEP 9

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

GO TO STEP 9

A

8.	OVERALL ANALYSIS AND TROUBLESHOOTING

(a) Diagnosis System

Click here

(b) Terminals of ECU

Click here

(c) Data List / Active Test

Click here

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9.	ADJUST, REPAIR OR REPLACE

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10.	CONFIRMATION TEST

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END

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