Lexus NX: Problem Symptoms Table

Lexus NX Service Manual / Audio & Visual & Telematics / Park Assist / Monitoring / Intuitive Parking Assist System (w/ Intelligent Clearance Sonar System) / Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

NOTICE:

The vehicle is equipped with a Supplemental Restraint System (SRS) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the precaution for Supplemental Restraint System.
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When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.

HINT:

Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
Inspect the fuses and relays related to this system before inspecting the suspected areas below.
When an open circuit or frozen indication is displayed by the self-check function, check for DTCs and troubleshoot according to each inspection procedure.

General

Symptom	Suspected Area	Link
System does not operate at all	Proceed to "Clearance Warning ECU Power Source Circuit"
	Meter / gauge system
	CAN communication system
	Steering pad switch assembly
	Spiral cable sub-assembly
	Clearance warning ECU assembly
System cannot be turned off	CAN communication system
	Meter / gauge system
	Steering pad switch assembly
	Spiral cable sub-assembly
	Clearance warning ECU assembly
	Harness or connector	-

Sonar Function

Symptom	Suspected Area	Link
Frozen indication is displayed in self-check function.	Proceed to "Sensor Frozen Indication (Dirty or Frozen)"
Combination meter assembly (shift selection) operates normally, but detection operates when shift lever is in P, or detection does not operate when shift lever is in any position other than P (front sonar)	CAN communication system
	Clearance warning ECU assembly
Combination meter assembly (shift selection) operates normally, but detection operates when shift lever is not in R, or does not operate with shift lever in R (rear sonar)	CAN communication system
	Clearance warning ECU assembly
Combination meter assembly (speedometer) operates normally, but detection does not operate when vehicle speed meets operation condition, or detection operates when vehicle speed does not meet operation condition (front sonar)	CAN communication system
	Clearance warning ECU assembly

Buzzer Function

Symptom	Suspected Area	Link
Sonar detection operation is normal but buzzer operation is intermittent	Check that the temporary mute or auto mute function is not operating	-
	Proceed to "No. 1 Clearance Warning Buzzer Circuit"
	Proceed to "No. 2 Clearance Warning Buzzer Circuit"
	Clearance warning ECU assembly

Display Function

Symptom	Suspected Area	Link
Detection operation is normal but clearance sonar indicator does not illuminate	CAN communication system
	Combination meter assembly (LED): Perform Active Test (Indicat. Clearance Sonar LCD)
	Combination meter assembly
	Clearance warning ECU assembly
Detection operation is normal but all sonar displays do not appear on multi-information display and multi-display	CAN communication system
	Clearance warning ECU assembly
Detection operation is normal but sonar displays do not appear on multi-information display	CAN communication system
	Combination meter assembly
	Clearance warning ECU assembly
Detection operation is normal but sonar displays do not appear on the multi-display (on the multi-display assembly)	CAN communication system
	Multi-display assembly
	Rear television camera assembly*1
	Parking assist ECU*2
	Clearance warning ECU assembly

*1: w/ Parking Assist Monitor System
*2: w/ Panoramic View Monitor System

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Parts Location

PARTS LOCATION ILLUSTRATION *1 HEADUP DISPLAY SWITCH ASSEMBLY *2 METER MIRROR SUB-ASSEMBLY *3 FORWARD RECOGNITION CAMERA *4 NO. 2 ENGINE ROOM RELAY BLOCK - ECU-B NO.1 FUSE *5 ECM *6 COMBINATION METER ASSEMBLY *7 DLC3 *8 RADIO RECEIVER ASSEMBLY *9 MAIN BO

Operation Check

OPERATION CHECK CHECK AIR DUST (a) Check that there are no cracks or damage on the air ducts of the seat climate control blower and seatback climate control blower, and that the air ducts are installed correctly. CHECK CLIMATE CONTROL SEAT SYSTEM (a) Turn the power switch on (IG). (b) Check that the

Lexus NX: Problem Symptoms Table

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Terminals Of Ecu

Diagnosis System

Dtc Check / Clear

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Parts Location

Operation Check