Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Tire Pressure Warning Light Circuit

DESCRIPTION

If the tire pressure warning ECU and receiver detects any problems, the tire pressure warning light blinks for 1 minute then illuminates, and tire pressure monitoring is disabled at the same time. At this time, the ECU stores a DTC in memory.

The tire pressure warning ECU and receiver sends the tire pressure warning light illumination request signal to the main body ECU (multiplex network body ECU) via a direct line. The main body ECU (multiplex network body ECU) then sends the signal to the combination meter assembly via CAN communication.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

• When replacing the tire pressure warning ECU and receiver, read the transmitter IDs and number of the transmitters (4 or 5) stored in the old ECU using the Techstream and write them down before removal.
• It is necessary to perform initialization after registration of the transmitter IDs into the tire pressure warning ECU and receiver if the ECU has been replaced.

PROCEDURE

(a) Check if CAN communication system DTCs are output.

Click here

B

GO TO CAN COMMUNICATION SYSTEM

A

(a) Clear the DTCs.

(b) Turn the engine switch off.

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

(d) Check for DTCs.

B

GO TO DTC (B1247)

A

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

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

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / Combination Meter / Active Test.

(f) Check the condition of the tire pressure warning light using the Techstream.

OK:

The tire pressure warning light turns on or off in accordance with the Techstream operation.

OK

REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER

NG

GO TO METER / GAUGE SYSTEM