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 ECU detects any trouble, the tire pressure warning light blinks (stays on after blinking for 1 minute) and tire pressure monitor is cancelled at the same time. At this time, the ECU records a DTC in the memory.
Connecting terminals TC and CG of the DLC3 makes the tire pressure warning light blink to output DTCs.

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
- When replacing the tire pressure warning ECU, read the transmitter IDs stored in the old ECU using Techstream and write them down before removal.
- It is necessary to perform initialization (Initialization) after registration (Registration) of the transmitter IDs into the tire pressure warning ECU if the ECU has been replaced.

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM (COMBINATION METER)
(a) Turn the ignition switch to the LOCK position.
(b) Connect Techstream to the DLC3.
(c) Turn the ignition switch to the ON position and turn the tester on.
(d) Enter the following menus: Body / Combination Meter / Active Test.
(e) Check the condition of the tire pressure warning light by operating the tester.

Combination Meter





OK:
The warning light turns on or off according to tester operation.
NG -- REPLACE COMBINATION METER
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECU AND BODY GROUND)





(a) Disconnect the T11 ECU connector.
(b) Disconnect the C9 meter connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE