Can Communication System (For Rhd) Seat Belt Control Ecu Communication Stop Mode

Communication System. Lexus Is250, Is220D. Gse20 Ale20
Can Communication. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

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

CHECK WIRE HARNESS (IG1, PGND)

CAN COMMUNICATION SYSTEM (for RHD) - Seat Belt Control ECU Communication Stop Mode


DESCRIPTION


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

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.Can Communication.Can Communication System (For Lhd).Can Communication System (For Rhd) Seat Belt Control Ecu Communication Stop Mode


INSPECTION PROCEDURE

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

  1. Turn the engine switch off.

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



    Lexus Is250, Is220D. Gse20 Ale20.Can Communication.Can Communication System (For Lhd).Can Communication System (For Rhd) Seat Belt Control Ecu Communication Stop Mode

  1. 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)


    Lexus Is250, Is220D. Gse20 Ale20.Can Communication.Can Communication System (For Lhd).Can Communication System (For Rhd) Seat Belt Control Ecu Communication Stop Mode

  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

  1. 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