TIRE PRESSURE WARNING SYSTEM, Diagnostic DTC:C2179/79

DTC Code DTC Name
C2179/79 Tire Pressure Monitor ECU Communication Stop

DESCRIPTION

The main body ECU (multiplex network body ECU) sends signals to the tire pressure warning ECU and receiver via a direct line.

DTC No. DTC Detection Condition Trouble Area
C2179/79 Communication between the main body ECU (multiplex network body ECU) and tire pressure warning ECU and receiver is interrupted for 10 seconds or more.

  • Main body ECU (Multiplex network body ECU)

  • Wire harness or connector

  • Tire pressure warning ECU and receiver

WIRING DIAGRAM

A01FF1BE03

INSPECTION PROCEDURE

Note


  • When replacing the tire pressure warning ECU and receiver, read the 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 after the ECU has been replaced.

  • If the main body ECU (multiplex network body ECU) is replaced, refer to the Service Bulletin.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU AND RECEIVER - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the tire pressure warning ECU and receiver T32 or U22 connector and main body ECU (multiplex network body ECU) N12 connector.

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

      Standard Resistance
      except GRL10R-BEZQHQ and GRL11R-BETQHQ
      Tester Connection Condition Specified Condition
      T32-5 (PRG) - N12-4 (PRG) Always Below 1 Ω
      T32-5 (PRG) - Body ground Always 10 kΩ or higher
      for GRL10R-BEZQHQ and GRL11R-BETQHQ
      Tester Connection Condition Specified Condition
      U22-5 (PRG2) - N12-4 (PRG) Always Below 1 Ω
      U22-5 (PRG2) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER


    1. Replace the tire pressure warning ECU and receiver (except GRL10R-BEZQHQ and GRL11R-BETQHQ: Click here, for GRL10R-BEZQHQ and GRL11R-BETQHQ: Click here.


    NEXT

  3. CHECK DTC OUTPUT


    1. Clear the DTCs Click here.

    2. Turn the engine switch off.

    3. Turn the engine switch on (IG).

    4. Check for DTCs Click here.

      OK
      DTC C2179/79 is not output.

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    OK

    END