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

A011QKYE08

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 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 (ECU - BATTERY AND BODY GROUND)


    1. A01D03ZC18
      *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 Q38 or Q36 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
      Q38-1 (IG) - Body ground Power switch on (IG) 10 to 16 V
      Power switch off Below 1 V
      for ECE-R64 Type
      Tester Connection Condition Specified Condition
      Q36-1 (IG) - Body ground Power switch on (IG) 10 to 16 V
      Power 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
      Q38-12 (GND) - Body ground Always Below 1 Ω
      for ECE-R64 Type
      Tester Connection Condition Specified Condition
      Q36-12 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR