Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT

PROCEDURE

1.	VEHICLE BROUGHT TO WORKSHOP

NEXT

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
The problem symptom indicates a parking assist monitor display malfunction and the problem symptom cannot be reproduced.	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.

NEXT

3.	INSPECT BATTERY VOLTAGE

(a) Measure the battery voltage.

Standard Voltage:

11 to 14 V

If the voltage is below 11 V, replace or recharge the battery before proceeding to the next step.

NEXT

4.	SYSTEM CHECK

(a) Check the vehicle specification.

Result	Proceed to
w/ Navigation System	A
w/ Audio and Visual System	B

B

GO TO STEP 6

A

5.	CHECK NAVIGATION SYSTEM

(a) Refer to the navigation system.

Click here

Result	Proceed to
Navigation system is normal	A
Navigation system is abnormal	B

A

GO TO STEP 7

B

GO TO NAVIGATION SYSTEM

6.	CHECK AUDIO AND VISUAL SYSTEM

(a) Refer to audio and visual system.

for 8 Inch Display:

Click here

for 12.3 Inch Display:

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

7.	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 DTCs are not output	A
CAN DTCs are output	B

B

GO TO CAN COMMUNICATION SYSTEM

A

8.	CHECK FOR DTC (PARKING ASSIST MONITOR SYSTEM)*

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

Click here

Chassis > Rear Camera > Trouble Codes

(b) Clear the DTCs.

Click here

Chassis > Rear Camera > Clear DTCs

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

Click here

Chassis > Rear Camera > Trouble Codes

NOTICE:

The radio receiver assembly outputs DTCs for the following systems. When DTCs other than those in Diagnostic Trouble Code Chart for the parking assist monitor system are output, refer to Diagnostic Trouble Code Chart for the relevant systems.

Refer to navigation system*1.

Click here

Refer to audio and visual system (for 8 Inch Display)*2.

Click here

Refer to audio and visual system (for 12.3 Inch Display)*2.

Click here

Result	Proceed to
No DTCs are output	A
DTCs for parking assist monitor system are output	B
DTCs for navigation system*1 are output	C
DTCs for audio and visual system*2 are output	D

*1: w/ Navigation System

*2: w/ Audio and Visual System

B

GO TO DIAGNOSTIC TROUBLE CODE CHART

C

GO TO NAVIGATION SYSTEM

D

GO TO AUDIO AND VISUAL SYSTEM

A

9.	PROBLEM SYMPTOMS TABLE

(a) Refer to the 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 11

A

10.	OVERALL ANALYSIS AND TROUBLESHOOTING*

(a) Diagnosis System.

Click here

(b) Terminals of ECU.

Click here

(c) Data List / Active Test.

Click here

NEXT

11.	ADJUST, REPAIR OR REPLACE IN ACCORDANCE WITH PROBLEM SYMPTOMS TABLE

NEXT

12.	CONFIRMATION TEST

NEXT

END