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 trouble, the tire pressure warning light blinks (comes 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.
Connect terminals TC and CG of DLC3 to make the tire pressure warning light blink and output the DTC.

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 the initialization Initialization after the registration Registration of the transmitter IDs into the tire pressure warning ECU if the ECU has been replaced.
HINT: This procedure must be performed according to the PROBLEM SYMPTOMS TABLE.

PROCEDURE

1. CHECK DTC
(a) Check if DTC B1247 is output in the multiplex communication system.
Result:






B -- REPAIR CIRCUITS INDICATED BY OUTPUT DTCs
A -- Continue to next step.
2. PERFORM ACTIVE TEST BY TECHSTREAM
(a) Make sure that the ignition switch is off.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to the ON position.
(d) Turn the Techstream on.
(e) Check the condition of the tire pressure warning light using the Techstream. Enter the following menus: Body / Combination Meter / Active Test.

Combination Meter:





OK:
The warning light turns on when operating the Techstream.
NG -- REPLACE COMBINATION METER
OK -- REPLACE TIRE PRESSURE WARNING ECU