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:

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 BEAN and CAN to each ECU including the center airbag sensor assembly, except for the skid control ECU with actuator. Thus when all systems except the VSC system do not enter DTC output mode, there may be an ECM malfunction.
   

WIRING DIAGRAM

1. LHD:
   
   
   

1. RHD:
   
   
   

INSPECTION PROCEDURE

1. CHECK CAN COMMUNICATION SYSTEM

1. Check if the CAN communication system DTC is output (Click here).
   

   Result:

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

B	REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

A

2. CHECK WIRE HARNESS (DLC3 - ECM)

1. Turn the engine switch off.

2. Disconnect the center airbag sensor assembly connector.

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

   Standard resistance:

   Tester connection	Condition	Specified condition
   J21-13 (TC) - A6-3 (TC)	Always	Below 1 Ω

NG	REPAIR OR REPLACE WIRE HARNESS (TC OF DLC3 - TC OF ECM)

OK

3. CHECK WIRE HARNESS (CG OF DLC3 - BODY GROUND)

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

   Standard resistance:

   Tester connection	Condition	Specified condition
   J21-4 (CG) - Body ground	Always	Below 1 Ω

NG	REPAIR OR REPLACE WIRE HARNESS (CG OF DLC3 - BODY GROUND)

OK

4. CHECK WIRE HARNESS (TC OF ECM - BODY GROUND)

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

   Standard resistance:

   Tester connection	Condition	Specified condition
   A6-3 (TC) - Body ground	Always	1 MΩ or higher

NG	REPAIR OR REPLACE WIRE HARNESS OR EACH ECU

OK
REPLACE CENTER AIRBAG SENSOR ASSEMBLY