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

B000TWEE62

CAUTION / NOTICE / HINT

Note


  • When replacing the tire pressure warning ECU and receiver, first use the GTS to record all of the current IDs and registered tires with transmitters (4 or 5 tires) of the tire pressure warning valve and transmitter registered to the tire pressure warning ECU and receiver.

  • 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 (TIRE PRESSURE WARNING ECU AND RECEIVER POWER SOURCE)


    1. B000UJDC07
      *A w/ Rear Fog Light
      *B w/o Rear Fog Light
      *a

      Front view of wire harness connector

      (to Tire Pressure Warning ECU and Receiver)

      Disconnect the X45*1 or X78*2 tire pressure warning ECU and receiver connector.


      • *1: w/ Rear Fog Light

      • *2: w/o Rear Fog Light

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

      Standard Voltage
      w/ Rear Fog Light
      Tester Connection Condition Specified Condition
      X45-1 (IG) - Body ground Engine switch on (IG) 10 to 16 V
      Engine switch off Below 1 V
      w/o Rear Fog Light
      Tester Connection Condition Specified Condition
      X78-1 (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
      w/ Rear Fog Light
      Tester Connection Condition Specified Condition
      X45-12 (GND) - Body ground Always Below 1 Ω
      w/o Rear Fog Light
      Tester Connection Condition Specified Condition
      X78-12 (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