Tire Pressure Warning System (For Sedan) Tire Pressure Warning Light Circuit
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECU AND BODY GROUND)
INSPECT COMBINATION METER
TIRE PRESSURE WARNING SYSTEM (for Sedan) - 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 1 second 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 transmitter IDs stored in the old ECU using a Techstream and write them down before removal.
- It is necessary to perform registration (YARIS_NCP93 RM000000XN107JX.html) of the transmitter IDs into the tire pressure warning ECU after the ECU has been replaced.
| 1.CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECU AND BODY GROUND) |
Disconnect the D78 ECU connector.
Disconnect the D1 meter connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection
| Condition
| Specified Condition
|
D78-5 (IND) - D1-6 (TIRE)
| Always
| Below 1 Ω
|
D78-5 (IND) - Body ground
| Always
| 10 kΩ or higher
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 2.INSPECT COMBINATION METER |
Disconnect the D78 ECU connector.
Turn the ignition switch to ON, and check if the tire pressure warning light illuminates.
- OK:
- Tire pressure warning light illuminates
ResultResult
| Proceed to
|
OK
| A
|
NG
| B
|
