Tire Pressure Warning Light Circuit

TIRE PRESSURE MONITORING: TIRE PRESSURE WARNING SYSTEM: Tire Pressure Warning Light Circuit
- Tire Pressure Warning Light Circuit

DESCRIPTION

If the tire pressure warning 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 the 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. CHECK OPERATION OF TIRE PRESSURE WARNING LIGHT (ACTIVE TEST)

(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) Check the condition of the tire pressure warning light by operating the Techstream.

Combination Meter





OK:

The warning light turns on when operating the Techstream.

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

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

(a) Disconnect the E46 combination meter connector.





(b) Disconnect the E94 tire pressure warning 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 -- REPLACE TIRE PRESSURE WARNING ECU Removal