TIRE PRESSURE WARNING SYSTEM ECU Power Source Circuit

DESCRIPTION

The IG circuit is the power source for the tire pressure warning ECU and receiver.

WIRING DIAGRAM

A01W2BZE40

CAUTION / NOTICE / HINT

Note


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

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

Tech Tips

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

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU AND RECEIVER - BATTERY AND BODY GROUND)


    1. A01W3Z4E04
      Text in Illustration
      *A for FMVSS138 Type
      *B for ECE-R64 Type
      *a

      Front view of wire harness connector

      (to Tire Pressure Warning ECU and Receiver)

      Disconnect the P29 or P25 tire pressure warning ECU and receiver connector.

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

      Standard Voltage
      for FMVSS138 Type
      Tester Connection Condition Specified Condition
      P29-1 (IG) - Body ground Engine switch on (IG) 10 to 16 V
      Engine switch off Below 1 V
      for ECE-R64 Type
      Tester Connection Condition Specified Condition
      P25-1 (IG) - Body ground Engine switch on (IG) 10 to 16 V
      Engine switch off Below 1 V

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

      Standard Resistance
      for FMVSS138 Type
      Tester Connection Condition Specified Condition
      P29-12 (GND) - Body ground Always Below 1 Ω
      for ECE-R64 Type
      Tester Connection Condition Specified Condition
      P25-12 (GND) - Body ground Always Below 1 Ω

    OK

    REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR