Lexus RX (RX 350L, RX450h) 2016-2022 Repair Manual: Warning Notification Function Malfunction

PROCEDURE

1.

CHECK PROBLEM SYMPTOM (WARNING NOTIFICATION FUNCTION)

(a) Check the problem symptom.

(1) Check the problem symptom of the warning notification function.

Result

Proceed to

The multi-display screen does not show a warning message even though a warning light turns on or the multi-information display indicates a warning.

A

The multi-display screen shows a warning message even though a warning light is not on and the multi-information display does not indicate a warning.

B

The multi-display screen shows a warning message different from the warning light or the multi-information display.

HINT:

  • The warning notification function sends information to the service center through communication.
  • Carefully confirm the conditions that caused the malfunction in order to determine if a temporary problem with the radio wave signal conditions caused the malfunction.
B

GO TO STEP 7

A

2.

INSPECT WARNING LIGHT

(a) Check if the indicated warning light or message is listed in the following table.

HINT:

Only messages listed in the table are included in the warning notification function.

Warning Name

Engine warning

Brake system warning

VSC warning

ABS warning

ECB warning

EPS warning

Charging system warning

Airbag warning

PCS warning

Cruise warning

LEXUS parking assist-sensor system open circuit warning

Drive start control warning

Brake override system warning

Entry and start system warning

Automatic headlight beam level control system warning

Automatic high beam warning

LED headlight warning

4WD warning

Tire pressure system warning

Electric parking brake warning

Auto hold warning

BSM system warning

Reverse control wiper warning

Advanced sonar system warning

Secondary collision brake system warning

Engine maintenance warning

LTA warning

RSA warning

RCTA warning

Engine oil level warning

Brake fluid warning

Engine oil pressure warning

Tire pressure system warning

Washer fluid level warning

Engine oil maintenance warning

High coolant temperature warning

Result

Proceed to

Warning light or message is listed in the table.

A

Warning light or message is not listed in the table.

B

B

END

A

3.

CHECK CAN COMMUNICATION SYSTEM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Bus Check.

(e) Check that all ECUs and sensors that use CAN communication are connected.

Click here

Result

Proceed to

There are no connection problems.

A

There is a connection problem.

B

B

GO TO CAN COMMUNICATION SYSTEM

A

4.

CHECK METER WARNING LIGHT

(a) Check that the warning light of the combination meter assembly illuminates and a message displays on the multi-information display when there is a malfunction, and do not when there is not a malfunction.

OK:

There are no problems with warning lights or warning messages.

HINT:

The warning notification function of the telematics system uses the warning notification signals sent and received by the meter/gauge system. Therefore, if the meter/gauge system is not operating normally, the warning notification function will not operate normally.

Result

Proceed to

OK (w/ Navigation System)

A

OK (w/o Navigation System)

B

NG

C

B

GO TO STEP 6

C

GO TO METER / GAUGE SYSTEM

A

5.

CHECK NAVIGATION SYSTEM

(a) Check if the navigation system is operating and functioning normally.

OK:

The navigation system is normal.

OK

REPLACE RADIO RECEIVER ASSEMBLY

NG

GO TO NAVIGATION SYSTEM

6.

CHECK AUDIO AND VISUAL SYSTEM

(a) Check if the audio and visual system is operating and functioning normally.

OK:

The audio and visual system is normal.

OK

REPLACE RADIO RECEIVER ASSEMBLY

NG

GO TO AUDIO AND VISUAL SYSTEM

7.

CHECK METER WARNING LIGHT

(a) Check that the warning light of the combination meter assembly illuminates and a message displays on the multi-information display when there is a malfunction, and do not when there is not a malfunction.

OK:

There are no problems with warning lights or warning messages.

HINT:

The warning notification function of the telematics system uses the warning notification signals sent and received by the meter/gauge system. Therefore, if the meter/gauge system is not operating normally, the warning notification function will not operate normally.

OK

REPLACE RADIO RECEIVER ASSEMBLY

NG

GO TO METER / GAUGE SYSTEM

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