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DTC B1284: PASSENGER SIDE JUNCTION BLOCK ECU COMMUNICATION STOP Lexus LS III

Note. DTC B1284 sets when there is no communication from passenger side junction block ECU and body ECU.

Disconnect passenger side junction block ECU connector. (Схема №8) Disconnect air bag sensor 28-pin connector. Disconnect ECM 35-pin connector. (Схема №10). Check for continuity in Red/Blue wire between passenger side junction block connector terminal No. 2 and air bag sensor assembly connector terminal No. 22. Check for continuity in Gray/Black wire between passenger side junction block ECU connector terminal No. 4 and ECM connector terminal No. 21. Repair wiring as necessary. If wiring is okay, replace passenger side junction block ECU.