Tire Pressure Warning Light Circuit

TIRE AND WHEEL: TIRE PRESSURE WARNING SYSTEM: Tire Pressure Warning Light Circuit

Tire Pressure Warning Light Circuit

DESCRIPTION

If the tire pressure warning ECU detects a disconnected connector or an open circuit between the tire pressure warning ECU and combination meter, the tire pressure warning light turns off 10 seconds after the ignition switch is turned ON, blinks for 1 minute, and then remains on.

WIRING DIAGRAM





INSPECTION PROCEDURE
NOTICE:
- When replacing the tire pressure warning ECU, read the IDs stored in the old ECU using the Techstream and write them down before removal.
- It is necessary to perform registration Programming and Relearning of the transmitter IDs into the tire pressure warning ECU after the ECU and/or the tire pressure warning valve and transmitter has been replaced.

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECU)





(a) Disconnect the C9 meter connector.
(b) Disconnect the T15 ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
2. INSPECT COMBINATION METER





(a) Disconnect the connector from the tire pressure warning ECU.
(b) Turn the ignition switch ON, and check if the tire pressure warning light illumination condition.

Result





B -- REPLACE COMBINATION METER ASSEMBLY
A -- CHECK ECU POWER SOURCE CIRCUIT