AIRBAG SYSTEM Diagnosis Circuit

DTC Code DTC Name
Diagnosis Circuit

DESCRIPTION

DTC output mode is set by connecting terminals TC and CG of the DLC3.

DTCs are output by the blinking of the SRS warning light.

Tip:

  • When each warning light remains blinking, a ground short in the wiring of terminal TC of the DLC3 or an internal ground short in each ECU is suspected.

  • A DTC output mode signal is transmitted through the CAN communication system to each ECU including the center airbag sensor. Thus, when all systems do not enter DTC output mode, there may be an ECM malfunction.

WIRING DIAGRAM

C177508E14

CAUTION / NOTICE / HINT

Note:

  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work (Click here).

  • When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected (Click here).

PROCEDURE

  1. CHECK CAN COMMUNICATION SYSTEM

    1. Check if a CAN communication system DTC is output.

      Table 1. Result

      Result

      Proceed to

      DTC is not output

      A

      DTC is output

      B

    REPAIR TROUBLE AREAS INDICATED BY OUTPUT DTCS

    (Click here)

  2. CHECK HARNESS AND CONNECTOR (DLC3 - ECM)

    1. Turn the ignition switch off.

      U184763E02

    2. Disconnect the A76 connector from the ECM.

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

      Standard Resistance

      for ZR Series Engine

      Tester Connection

      Condition

      Specified Condition

      H16-13 (TC) - A76-33 (TC)

      Always

      Below 1 Ω

      for 1WW Engine

      Tester Connection

      Condition

      Specified Condition

      H16-13 (TC) - A76-50 (TC)

      Always

      Below 1 Ω
      Table 2. Text in Illustration

      *1

      Front view of DLC3

      *2

      Front view of wire harness connector

      (to ECM)

      *3

      for ZR Series Engine

      *4

      for 1WW Engine

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. CHECK HARNESS AND CONNECTOR (DLC3 - BODY GROUND)

    1. U122814E02

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      H16-4 (CG) - Body ground

      Always

      Below 1 Ω
      Table 3. Text in Illustration

      *1

      Front view of DLC3

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. CHECK HARNESS AND CONNECTOR (TC OF ECM - BODY GROUND)

    1. C363605E01

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

      Standard Resistance

      for ZR Series Engine

      Tester Connection

      Condition

      Specified Condition

      A76-33 (TC) - Body ground

      Always

      1 MΩ or higher

      for 1WW Engine

      Tester Connection

      Condition

      Specified Condition

      A76-50 (TC) - Body ground

      Always

      1 MΩ or higher
      Table 4. Text in Illustration

      *1

      Front view of wire harness connector

      (to ECM)

      *2

      for ZR Series Engine

      *3

      for 1WW Engine

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY

    (Click here)

    REPAIR OR REPLACE HARNESS OR CONNECTOR