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. Detection Item DTC Detection Condition Trouble Area Note
C2179/79 Tire Pressure Monitor ECU Communication Stop 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)

  • Harness or connector

  • Tire pressure warning ECU and receiver

 -

WIRING DIAGRAM

A01OEEQE19

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.

    Click here

  • It is necessary to perform initialization 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.

  • As the door control battery is installed between the vehicle battery and main body ECU (multiplex network body ECU), first perform the inspections in On-Vehicle Inspection to confirm that there are no malfunctions in the power source circuit for the main body ECU (multiplex network body ECU) before performing this troubleshooting procedure.*

    *: w/ Rear Pretensioner

PROCEDURE


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


    1. Disconnect the P11*1 or Q46*2 tire pressure warning ECU and receiver connector.


      • *1: except AGZ10R-AWTLTQ or AGZ15R-AWTLTQ Deck Floor Box LH without Compact Spare Tire Caution Label

      • *2: for AGZ10R-AWTLTQ or AGZ15R-AWTLTQ Deck Floor Box LH without Compact Spare Tire Caution Label

    2. Disconnect the I48 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      except AGZ10R-AWTLTQ or AGZ15R-AWTLTQ Deck Floor Box LH without Compact Spare Tire Caution Label
      Tester Connection Condition Specified Condition
      P11-5 (PRG) - I48-5 (PRG) Always Below 1 Ω
      P11-5 (PRG) or I48-5 (PRG) - Body ground Always 10 kΩ or higher
      for AGZ10R-AWTLTQ or AGZ15R-AWTLTQ Deck Floor Box LH without Compact Spare Tire Caution Label
      Tester Connection Condition Specified Condition
      Q46-5 (PRG2) - I48-5 (PRG) Always Below 1 Ω
      Q46-5 (PRG2) or I48-5 (PRG) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    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 AGZ10R-AWTLTQ or AGZ15R-AWTLTQ Deck Floor Box LH without Compact Spare Tire Caution Label: Click here

      for AGZ10R-AWTLTQ or AGZ15R-AWTLTQ Deck Floor Box LH without Compact Spare Tire Caution Label: Click here

      Result
      Proceed to
      NEXT

    NEXT

  3. CHECK DTC OUTPUT


    1. Clear the DTCs.

      Click here


      Chassis > Tire Pressure Monitor > Clear DTCs

    2. Turn the engine switch off.

    3. Turn the engine switch on (IG).

    4. Check for DTCs.

      Click here


      Chassis > Tire Pressure Monitor > Trouble Codes
      OK
      DTC C2179/79 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for LHD: Click here
    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for RHD: Click here