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 any problems, the tire pressure warning light blinks (stays on after blinking for 1 minute) and tire pressure monitoring is cancelled at the same time. At this time, the ECU stores a DTC in 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 a 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 after the ECU has been replaced.

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM (INDICATE. TIRE PRESSURE WARNING SYSTEM)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

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

(f) According to the display on the Techstream, perform the Active Test.

Combination Meter





OK:

The warning light illuminates when operating the Techstream.

NG -- GO TO COMBINATION METER How To Proceed With Troubleshooting
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (COMBINATION METER - TIRE PRESSURE WARNING ECU AND BODY GROUND)

(a) Disconnect the E74 tire pressure warning ECU connector.

(b) Disconnect the E13 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 -- REPLACE TIRE PRESSURE WARNING ECU Removal