Seat Belt Control ECU Communication Stop Mode

DESCRIPTION

Detection Item	Symptom	Trouble Area
Seat Belt Control ECU Communication Stop Mode	"Pre-crash Seat Belt" is not displayed on the "Communication Bus Check" screen of the intelligent tester Applies to "Seat Belt Control ECU Communication Stop Mode" in the "DTC COMBINATION TABLE"	Power source circuit of the seat belt control ECU Seat belt control ECU branch line or connector Seat belt control ECU

HINT:

"Pre-crash Seat Belt" refers to the circuit that includes the seat belt control ECU.

WIRING DIAGRAM

INSPECTION PROCEDURE

1. CHECK CAN BUS LINE FOR OPEN (SEAT BELT CONTROL ECU BRANCH LINE)

1. Turn the engine switch off.

2. Disconnect the seat belt control ECU connector (Q38).

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

   Standard resistance:

   Tester Connection	Condition	Specified Value
   Q38-4 (CANH) - Q38-6 (CANL)	Engine switch off	54 to 69 Ω

NG	REPAIR OR REPLACE SEAT BELT CONTROL ECU BRANCH LINE OR CONNECTOR (CAN-H, CAN-L)

OK

2. CHECK WIRE HARNESS (IG1, PGND)

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

   Standard resistance:

   Tester Connection	Condition	Specified Value
   Q38-18 (PGND) - Body ground	Always	Below 1 Ω

2. Measure the voltage according to the value(s) in the table below.

   Standard voltage:

   Tester Connection	Condition	Specified Value
   Q38-3 (IG1) - Body ground	Engine switch on (IG)	10 to 14 V

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK
REPLACE SEAT BELT CONTROL ECU