Component Tests and General Diagnostics

SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: TC and CG Terminal Circuit

TC and CG Terminal Circuit

DESCRIPTION

DTC output mode is set by connecting terminals TC and CG of the DLC3.
The DTCs are displayed by blinking the SRS warning light.
HINT:
- Make sure that DTCs which relate to the CAN communication system are not output. If any of these DTCs are output, check the CAN communication system Diagnosis System.
- When a warning light keeps blinking, a short to ground in the wiring of terminal TC of the DLC3 or an internal ground short in an ECU is suspected.
- The DTC output mode signal is transmitted through the CAN to each ECU including the center airbag sensor assembly. Thus when no systems enter DTC output mode, the ECM may have a malfunction.

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (DLC3 - ECM)




(a) Turn the ignition switch off.
(b) Disconnect the connector from the ECM.
(c) Measure the resistance.
Standard resistance:






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




(a) Measure the resistance.
Standard resistance:






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




(a) Measure the resistance.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. REPLACE ECM
(a) Replace the ECM.
(b) Check for DTCs of the ECM DTC Check / Clear.
Result:






B -- GO TO INSPECTION PROCEDURE OF DTC OUTPUT
A -- END
C -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY