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Home >> Lexus >> 2004 >> RX 330 FWD V6-3.3L (3MZ-FE) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Information Bus >> Testing and Inspection >> Initial Inspection and Diagnostic Overview >> Multiplex Communication System >> Pre-Check
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Pre-Check

PRE-CHECK

1. MULTIPLEX COMMUNICATION SYSTEM (BEAN) DESCRIPTION




a. The BEAN communication line is used to control the following items:
- Airbag sensor assy (Airbag ECU)
- Combination meter assy (Meter ECU)
- Power window regulator master switch assy
- A/C amplifier (A/C ECU)
- Multiplex tilt & telescopic ECU
- Transponder key ECU
- ECM
- Center cluster integration switch assy
- Network gateway ECU
- Rain sensor
- Sliding roof drive gear assy (Sliding roof ECU)
- Headlamp swivel ECU (AFS ECU)
- Multiplex network door ECU back (Power back door ECU)
- Position control ECU & switch assy (Power seat ECU)
- Telephone ECU (Mayday ECU)
- Windshield wiper relay assy (Wiper ECU)
- Driver side outer mirror control ECU
- Passenger side outer mirror control ECU

If there is a short-circuit (bus-down) in the line, communication to the system that has a short-circuit (bus-down) will be disabled and the DTC concerning the system will be output from the multiplex network body ECU.





b. If DTC indicating ECU communication stop is output, the connectors may be disconnected or the communication buses may be open at 2 points. Only 1 communication bus open will not set DTC.




c. If 2 communication buses are open at the positions as shown in the illustration, DTC indicating ECU communication stop between those 2 buses is output.
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