Lexus IS250 IS220d GSE20 ALE20 - CAN COMMUNICATION
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 | "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) |
Turn the engine switch off.
Disconnect the seat belt control ECU connector (Q38).
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
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| OK | |
| 2.CHECK WIRE HARNESS (IG1, PGND) |
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
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
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| OK | ||
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