Toyota CH-R Service Manual: ECU Power Source Circuit

Toyota CH-R Service Manual / Tire Pressure Monitoring / Tire Pressure Warning System / ECU Power Source Circuit

DESCRIPTION

This is the power source for the tire pressure warning ECU and receiver.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When replacing the tire pressure warning ECU and receiver, read the transmitter IDs stored in the old ECU using the Techstream and write them down before removal.

    Click here

  • It is necessary to perform initialization after registration of the transmitter IDs into the tire pressure warning ECU and receiver if the ECU has been replaced.

HINT:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (ECU - BATTERY AND BODY GROUND)

(a) Disconnect the M23 tire pressure warning ECU and receiver connector.

*a

Front view of wire harness connector

(to Tire Pressure Warning ECU and Receiver)

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

M23-1 (IG) - Body ground

Ignition switch to ON

10 to 16 V

Ignition switch off

Below 1 V

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

M23-12 (GND) - Body ground

Always

Below 1 Ω
OK

REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
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    DESCRIPTION The tire pressure warning valve and transmitters that are installed in the tire and wheel assemblies measure the tire pressures. The measured values are transmitted to the tire pressu ...

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