AIRBAG SYSTEM > Diagnosis Circuit

for Preparation Click here


DESCRIPTION

DTC output mode is set by connecting terminals TC and CG of the DLC3.
DTCs are displayed by blinking of the SRS warning light.

HINT:
  1. When each warning light stays blinking, a ground short in the wiring of terminal TC of the DLC3 or an internal ground short in each ECU is suspected.
  2. A DTC output mode signal is transmitted through the CAN communication system to each ECU including the center airbag sensor. When all systems do not enter DTC output mode, there may be an ECM malfunction.

WIRING DIAGRAM


C160530E01


INSPECTION PROCEDURE

NOTICE:
  1. After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work (Click here).
  2. 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).
1.CHECK CAN COMMUNICATION SYSTEM
  1. Check if a CAN communication system DTC is output (Click here).

    Result 
    Result
    Proceed to
    DTC is output
    A
    DTC is not output
    B


A
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS
B


2.CHECK HARNESS AND CONNECTOR (DLC3 - ECM)
E146093E02
  1. Turn the ignition switch OFF.

  1. Disconnect the A24 ECM connector.

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

    Standard resistance:
    Tester Connection
    Condition
    Specified Condition
    J17-13 (TC) - A24-16 (TC)
    Always
    Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK HARNESS AND CONNECTOR (DLC3 - BODY GROUND)
H102392E89
  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester Connection
    Condition
    Specified Condition
    J17-4 (CG) - Body ground
    Always
    Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)
C162204E01
  1. Measure the resistance according to the value(s) in the table below.

    Standard resistance:
    Tester Connection
    Condition
    Specified Condition
    A24-16 (TC) - Body ground
    Always
    1 MΩ or higher
    Result 
    Result
    Proceed to
    NG
    A
    OK (for 1GR-FE)
    B
    OK (for 1UR-FE)
    C
    OK (for 3UR-FE)
    D
    OK (for 3UR-FBE)
    E


A
REPAIR OR REPLACE HARNESS OR CONNECTOR OR EACH ECU

B
REPLACE ECM (Click here)

C
REPLACE ECM (Click here)

D
REPLACE ECM (Click here)
E

REPLACE ECM (Click here)