Component Tests and General Diagnostics

SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: Diagnosis Circuit

Diagnosis Circuit

DESCRIPTION

DTC output mode is set by connecting terminals TC and CG of the DLC3.
DTCs are displayed by blinking the SRS warning light.
HINT:
- 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.
- A DTC output mode signal is transmitted through BEAN and CAN to each ECU including the center airbag sensor assembly. Thus when all systems do not enter DTC output mode, there may be an ECM malfunction.

WIRING DIAGRAM









INSPECTION PROCEDURE

PROCEDURE

1. CHECK MULTIPLEX COMMUNICATION SYSTEM
(a) Check if the multiplex communication system DTC is output Reading and Clearing Diagnostic Trouble Codes.
HINT: The center airbag sensor assembly of this system is connected to the multiplex communication system. Therefore, before starting troubleshooting, make sure to check that there is no trouble in the multiplex communication system.

OK:
The Multiplex communication system DTC is not output.
NG -- REPAIR CIRCUITS INDICATED BY OUTPUT DTCS
OK -- Continue to next step.
2. CHECK CAN COMMUNICATION SYSTEM
(a) Use the Techstream to check if the CAN communication system is functioning normally How to Proceed With Troubleshooting.
HINT: The ECM is connected to the CAN communication system. Therefore, before starting troubleshooting, make sure to check that there is no trouble in the CAN communication system.

OK:
The CAN communication system is functioning normally.
NG -- REPAIR CAN COMMUNICATION CIRCUIT
OK -- Continue to next step.
3. CHECK WIRE HARNESS (TC OF DLC3 - TC OF ECM)





(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the connector from the ECM.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE WIRE HARNESS (TC OF DLC3 - TC OF ECM)
OK -- Continue to next step.
4. CHECK WIRE HARNESS (CG OF DLC3 - BODY GROUND)





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






NG -- REPAIR OR REPLACE WIRE HARNESS (CG OF DLC3 - BODY GROUND)
OK -- Continue to next step.
5. CHECK WIRE HARNESS (TC OF DLC3 - BODY GROUND)





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






NG -- REPAIR OR REPLACE WIRE HARNESS OR EACH ECU
OK -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY