TIRE PRESSURE WARNING SYSTEM ECU Power Source Circuit

DESCRIPTION

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

WIRING DIAGRAM

A01QSYWE09

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 (Click here ) after registration Click here of the transmitter IDs into the tire pressure warning ECU and receiver if the ECU has been replaced.

Tech Tips

w/o Stop and Start System:

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)


    1. A01QRDXC29
      *A for Air Bag Caution Label with "9L" Identification Mark
      *B except Air Bag Caution Label with "9L" Identification Mark
      *a

      Front view of wire harness connector

      (to Tire Pressure Warning ECU and Receiver)

      Disconnect the tire pressure warning ECU and receiver M11*1 or M30*2 connector.


      • *1: for Air Bag Caution Label with "9L" Identification Mark

      • *2: except Air Bag Caution Label with "9L" Identification Mark

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

      Standard Voltage
      for Air Bag Caution Label with "9L" Identification Mark
      Tester Connection Switch Condition Specified Condition
      M11-1 (IG) - Body ground Ignition switch ON 10 to 16 V
      Ignition switch off Below 1 V
      except Air Bag Caution Label with "9L" Identification Mark
      Tester Connection Switch Condition Specified Condition
      M30-1 (IG) - Body ground Ignition switch ON 10 to 16 V
      Ignition switch off Below 1 V

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

      Standard Resistance
      for Air Bag Caution Label with "9L" Identification Mark
      Tester Connection Condition Specified Condition
      M11-12 (E) - Body ground Always Below 1 Ω
      except Air Bag Caution Label with "9L" Identification Mark
      Tester Connection Condition Specified Condition
      M30-12 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG (w/o Stop and Start System)
      NG (w/ Stop and Start System)

    OK

    REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER Click here

    NG (w/o Stop and Start System)

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    NG (w/ Stop and Start System)

    INSPECT STOP AND START SYSTEM (BACKUP BOOST CONVERTER CIRCUIT) for 2WW: Click here
    INSPECT STOP AND START SYSTEM (BACKUP BOOST CONVERTER CIRCUIT) for 3ZR-FAE: Click here