Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VJQE
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 - 08/2016]
Title: SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: TC and CG Terminal Circuit; 2016 MY Sienna [12/2015 - 08/2016]

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 (See page 2016 MY Sienna [12/2015 - 08/2016]; NETWORKING: 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 if no systems enter DTC output mode, the ECM may have a malfunction.

WIRING DIAGRAM

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D16-13 (TC) -

A39-16 (TC)

Always

Below 1 Ω

Text in Illustration

*a

Front view of DLC3

*b

Front view of wire harness connector

(to ECM)
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

2.

CHECK HARNESS AND CONNECTOR (CG OF DLC3 - BODY GROUND)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D16-4 (CG) -

Body ground

Always

Below 1 Ω

Text in Illustration

*a

Front view of DLC3
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

3.

CHECK HARNESS AND CONNECTOR (TC OF ECM)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A39-16 (TC) -

Body ground

Always

1 MΩ or higher

Text in Illustration

*a

Front view of wire harness connector

(to ECM)
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

REPLACE ECM

(a) Replace the ECM (See page 2016 MY Sienna [12/2015 - 08/2016]; 2GR-FE (ENGINE CONTROL): ECM: REMOVAL ).

(b) Check for DTCs of the ECM.

Result

Result

Proceed to

Normal system code is output.

A

DTC is output.

B

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

C
A

END
B

GO TO INSPECTION PROCEDURE OF DTC OUTPUT

C

REPLACE CENTER AIRBAG SENSOR ASSEMBLY