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 DTC B1281 has not been output. If DTC B1281 has been output, refer to the multiplex communication system.
* When each warning light keeps blinking, a short to ground in the wiring of terminal TC of the DLC3 or an internal ground short in each ECU is suspected.
* The DTC output mode signal is transmitted through BEAN to each ECU including the center airbag sensor assembly. Thus when all systems do not enter DTC output mode, it can be suspected that there is an ECM malfunction.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK WIRE HARNESS (DLC3 - ECM)

(a) Turn the engine switch off.

(b) Disconnect the connectors from the center airbag sensor assembly.

for 2GR-FSE

NG -- REPAIR OR REPLACE WIRE HARNESS (TC OF DLC3 - TC OF ECM)
OK -- Continue to next step.

2. 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.

3. CHECK WIRE HARNESS (TC OF ECM)

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

Standard resistance:

for 1UR-FSE

for 2GR-FSE

NG -- REPAIR OR REPLACE WIRE HARNESS OR EACH ECU
OK -- Continue to next step.

4. REPLACE ECM

(a) Replace the ECM.

(b) Check the DTC of the ECM Reading and Clearing Diagnostic Trouble Codesfor 1UR-FSE, Reading and Clearing Diagnostic Trouble Codes for 2GR-FSE).

Result:

A
Normal system code is output.

B
DTC is output.

C
DTC output mode is set (except center airbag sensor assembly).

B -- GO TO INSPECTION PROCEDURE OF DTC OUTPUT

A -- END

C -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY