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LIN Communication System (Diagnostic Codes): Overview Lexus RX III

Communication Devices 14 illustrations ~961 words

DESCRIPTION

This DTC is stored when LIN communication between the multiplex network master switch assembly and main body ECU (multiplex network body ECU) stops for more than 10 seconds.

DTC No.DTC Detection ConditionTrouble Area
B1206No communication between multiplex network master switch assembly and main body ECU (multiplex network body ECU) for more than 10 seconds.Multiplex network master switch assembly Main body ECU (multiplex network body ECU) Instrument panel junction block assembly Wire harness or connector ECU-B NO. 2 fuse

Scheme 79

Scheme 79: WIRING DIAGRAM

This DTC is stored when LIN communication between the multiplex network master switch assembly and main body ECU (multiplex network body ECU) stops for more than 10 seconds.

DTC No.DTC Detection ConditionTrouble Area
B1206No communication between multiplex network master switch assembly and main body ECU (multiplex network body ECU) for more than 10 seconds.Multiplex network master switch assembly Main body ECU (multiplex network body ECU) Instrument panel junction block assembly Wire harness or connector ECU-B NO. 2 fuse

These DTCs are stored when the main body ECU (multiplex network body ECU) detects malfunctions in the LIN communication system.

DTC No.DTC Detection ConditionTrouble Area
B124DMalfunctions in LIN communication systemInner rear view mirror assembly Wire harness or connector AFS ECU (headlight swivel ECU assembly)
B2432Malfunction in LIN communication systemInner rear view mirror assembly Wire harness or connector AFS ECU (headlight swivel ECU assembly)

Scheme 80

Scheme 80: WIRING DIAGRAM

These DTCs are stored when the main body ECU (multiplex network body ECU) detects malfunctions in the LIN communication system.

DTC No.DTC Detection ConditionTrouble Area
B124DMalfunctions in LIN communication systemInner rear view mirror assembly Wire harness or connector AFS ECU (headlight swivel ECU assembly)
B2432Malfunction in LIN communication systemInner rear view mirror assembly Wire harness or connector AFS ECU (headlight swivel ECU assembly)

This DTC is stored when LIN communication between the sliding roof ECU (sliding roof drive gear assembly) and main body ECU (multiplex network body ECU) stops for more than 10 seconds.

DTC No.DTC Detection ConditionTrouble Area
B1273No communication between the sliding roof ECU (sliding roof drive gear assembly) and main body ECU (multiplex network body ECU) for more than 10 seconds.Sliding roof ECU (sliding roof drive gear assembly) Main body ECU (multiplex network body ECU) Instrument panel junction block assembly Wire harness or connector S/ROOF fuse ECU-B NO. 3 fuse

Scheme 81

Scheme 81: WIRING DIAGRAM

This DTC is stored when LIN communication between the sliding roof ECU (sliding roof drive gear assembly) and main body ECU (multiplex network body ECU) stops for more than 10 seconds.

DTC No.DTC Detection ConditionTrouble Area
B1273No communication between the sliding roof ECU (sliding roof drive gear assembly) and main body ECU (multiplex network body ECU) for more than 10 seconds.Sliding roof ECU (sliding roof drive gear assembly) Main body ECU (multiplex network body ECU) Instrument panel junction block assembly Wire harness or connector S/ROOF fuse ECU-B NO. 3 fuse

This DTC is stored when there is an open, short or ECU communication malfunction between the power management control ECU and certification ECU (smart key ECU assembly).

DTC No.DTC Detection ConditionTrouble Area
B2287There is an open, short or ECU communication malfunction between the power management control ECU and certification ECU (smart key ECU assembly).Power management control ECU Certification ECU (smart key ECU assembly) Wire harness or connector

Scheme 82

Scheme 82: WIRING DIAGRAM

This DTC is stored when there is an open, short or ECU communication malfunction between the power management control ECU and certification ECU (smart key ECU assembly).

DTC No.DTC Detection ConditionTrouble Area
B2287There is an open, short or ECU communication malfunction between the power management control ECU and certification ECU (smart key ECU assembly).Power management control ECU Certification ECU (smart key ECU assembly) Wire harness or connector

This DTC is stored when LIN communication between the front power window regulator motor assembly LH and main body ECU (multiplex network body ECU) stops for more than 10 seconds.

DTC No.DTC Detection ConditionTrouble Area
B2321No communication between front power window regulator motor assembly LH and main body ECU (multiplex network body ECU) for more than 10 seconds.Front power window regulator motor assembly LH Main body ECU (multiplex network body ECU) Instrument panel junction block assembly Multiplex network master switch assembly Wire harness or connector FL DOOR fuse

Scheme 83

Scheme 83: WIRING DIAGRAM

This DTC is stored when LIN communication between the front power window regulator motor assembly LH and main body ECU (multiplex network body ECU) stops for more than 10 seconds.

DTC No.DTC Detection ConditionTrouble Area
B2321No communication between front power window regulator motor assembly LH and main body ECU (multiplex network body ECU) for more than 10 seconds.Front power window regulator motor assembly LH Main body ECU (multiplex network body ECU) Instrument panel junction block assembly Multiplex network master switch assembly Wire harness or connector FL DOOR fuse

This DTC is stored when LIN communication between the front power window regulator motor assembly RH and main body ECU (multiplex network body ECU) stops for more than 10 seconds.

DTC No.DTC Detection ConditionTrouble Area
B2322No communication between front power window regulator motor assembly RH and main body ECU (multiplex network body ECU) for more than 10 seconds.Front power window regulator motor assembly RH Main body ECU (multiplex network body ECU) Instrument panel junction block assembly Wire harness or connector FR DOOR fuse

Scheme 84

Scheme 84: WIRING DIAGRAM

This DTC is stored when LIN communication between the front power window regulator motor assembly RH and main body ECU (multiplex network body ECU) stops for more than 10 seconds.

DTC No.DTC Detection ConditionTrouble Area
B2322No communication between front power window regulator motor assembly RH and main body ECU (multiplex network body ECU) for more than 10 seconds.Front power window regulator motor assembly RH Main body ECU (multiplex network body ECU) Instrument panel junction block assembly Wire harness or connector FR DOOR fuse

This DTC is stored when LIN communication between the rear power window regulator motor assembly RH and main body ECU (multiplex network body ECU) stops for more than 10 seconds.

DTC No.DTC Detection ConditionTrouble Area
B2323No communication between rear power window regulator motor assembly RH and main body ECU (multiplex network body ECU) for more than 10 seconds.Rear power window regulator motor assembly RH Main body ECU (multiplex network body ECU) Instrument panel junction block assembly Wire harness or connector RR DOOR fuse

Scheme 85

Scheme 85: WIRING DIAGRAM

This DTC is stored when LIN communication between the rear power window regulator motor assembly RH and main body ECU (multiplex network body ECU) stops for more than 10 seconds.

DTC No.DTC Detection ConditionTrouble Area
B2323No communication between rear power window regulator motor assembly RH and main body ECU (multiplex network body ECU) for more than 10 seconds.Rear power window regulator motor assembly RH Main body ECU (multiplex network body ECU) Instrument panel junction block assembly Wire harness or connector RR DOOR fuse

This DTC is stored when LIN communication between the rear power window regulator motor assembly LH and main body ECU (multiplex network body ECU) stops for more than 10 seconds.

DTC No.DTC Detection ConditionTrouble Area
B2324No communication between rear power window regulator motor assembly LH and main body ECU (multiplex network body ECU) for more than 10 seconds.Rear power window regulator motor assembly LH Main body ECU (multiplex network body ECU) Instrument panel junction block assembly Wire harness or connector RL DOOR fuse

Scheme 86

Scheme 86: WIRING DIAGRAM

This DTC is stored when LIN communication between the rear power window regulator motor assembly LH and main body ECU (multiplex network body ECU) stops for more than 10 seconds.

DTC No.DTC Detection ConditionTrouble Area
B2324No communication between rear power window regulator motor assembly LH and main body ECU (multiplex network body ECU) for more than 10 seconds.Rear power window regulator motor assembly LH Main body ECU (multiplex network body ECU) Instrument panel junction block assembly Wire harness or connector RL DOOR fuse

The main body ECU (multiplex network body ECU) monitors communication between all the ECUs connected to the door bus lines. When the main body ECU (multiplex network body ECU) detects errors in communication with all the ECUs connected to the door bus lines at 2.6-second intervals and 3 times in a row, DTC B2325 will be stored.

DTC No.DTC Detection ConditionTrouble Area
B2325Main body ECU (multiplex network body ECU) detects errors in communication with the ECUs connected to the door bus lines 3 times in a row.Front power window regulator motor assembly LH Front power window regulator motor assembly RH Rear power window regulator motor assembly RH Rear power window regulator motor assembly LH Multiplex network master switch assembly Sliding roof ECU (sliding roof drive gear assembly) Main body ECU (multiplex network body ECU) Instrument panel junction block assembly Wire harness or connector

Scheme 87

Scheme 87: WIRING DIAGRAM

The main body ECU (multiplex network body ECU) monitors communication between all the ECUs connected to the door bus lines. When the main body ECU (multiplex network body ECU) detects errors in communication with all the ECUs connected to the door bus lines at 2.6-second intervals and 3 times in a row, DTC B2325 will be stored.

DTC No.DTC Detection ConditionTrouble Area
B2325Main body ECU (multiplex network body ECU) detects errors in communication with the ECUs connected to the door bus lines 3 times in a row.Front power window regulator motor assembly LH Front power window regulator motor assembly RH Rear power window regulator motor assembly RH Rear power window regulator motor assembly LH Multiplex network master switch assembly Sliding roof ECU (sliding roof drive gear assembly) Main body ECU (multiplex network body ECU) Instrument panel junction block assembly Wire harness or connector

These DTCs are stored when the AFS ECU (headlight swivel ECU assembly) detects errors in its own communications with the headlight swivel motors.

DTC No.DTC Detection ConditionTrouble Area
B2410AFS ECU (headlight swivel ECU assembly) detected errors in its own communication with headlight swivel motor LHHeadlight swivel motor LH Wire harness or connector AFS ECU (headlight swivel ECU assembly)
B2411AFS ECU detected errors in is own communication with headlight swivel motor RHHeadlight swivel motor RH Wire harness or connector AFS ECU (headlight swivel ECU assembly)

Scheme 88

Scheme 88: WIRING DIAGRAM

These DTCs are stored when the AFS ECU (headlight swivel ECU assembly) detects errors in its own communications with the headlight swivel motors.

DTC No.DTC Detection ConditionTrouble Area
B2410AFS ECU (headlight swivel ECU assembly) detected errors in its own communication with headlight swivel motor LHHeadlight swivel motor LH Wire harness or connector AFS ECU (headlight swivel ECU assembly)
B2411AFS ECU detected errors in is own communication with headlight swivel motor RHHeadlight swivel motor RH Wire harness or connector AFS ECU (headlight swivel ECU assembly)

The AFS ECU (headlight swivel ECU assembly) receives a signal from each headlight leveling motor using LIN communication.

DTC No.DTC Detection ConditionTrouble Area
B2424Malfunction in headlight leveling motor LH Open or short in headlight leveling motor LH communication circuitHeadlight leveling motor LH Wire harness or connector AFS ECU (headlight swivel ECU assembly)
B2425Malfunction in headlight leveling motor RH Open or short in headlight leveling motor RH communication circuitHeadlight leveling motor RH Wire harness or connector AFS ECU (headlight swivel ECU assembly)

The AFS ECU (headlight swivel ECU assembly) receives a signal from each headlight leveling motor using LIN communication.

DTC No.DTC Detection ConditionTrouble Area
B2424Malfunction in headlight leveling motor LH Open or short in headlight leveling motor LH communication circuitHeadlight leveling motor LH Wire harness or connector AFS ECU (headlight swivel ECU assembly)
B2425Malfunction in headlight leveling motor RH Open or short in headlight leveling motor RH communication circuitHeadlight leveling motor RH Wire harness or connector AFS ECU (headlight swivel ECU assembly)

The certification ECU (smart key ECU assembly) monitors communication between all the ECUs connected to the certification bus lines. When the certification ECU (smart key ECU assembly) detects errors in communication with all the ECUs connected to the certification bus lines at a set interval and 3 times in a row, DTC B2785 will be stored.

DTC No.DTC Detection ConditionTrouble Area
B2785Errors in LIN communication between ECUs and an open or short in communication lines LIN communication from the certification ECU (smart key ECU assembly) stops for a set amount of time or moreCertification ECU (smart key ECU assembly) Power management control ECU Steering lock ECU (steering lock actuator assembly) ID code box (immobilizer code ECU) Wire harness or connector

Scheme 89

Scheme 89: WIRING DIAGRAM

The certification ECU (smart key ECU assembly) monitors communication between all the ECUs connected to the certification bus lines. When the certification ECU (smart key ECU assembly) detects errors in communication with all the ECUs connected to the certification bus lines at a set interval and 3 times in a row, DTC B2785 will be stored.

DTC No.DTC Detection ConditionTrouble Area
B2785Errors in LIN communication between ECUs and an open or short in communication lines LIN communication from the certification ECU (smart key ECU assembly) stops for a set amount of time or moreCertification ECU (smart key ECU assembly) Power management control ECU Steering lock ECU (steering lock actuator assembly) ID code box (immobilizer code ECU) Wire harness or connector

This DTC is stored when LIN communication between the certification ECU (smart key ECU assembly) and steering lock ECU (steering lock actuator assembly) stops for more than 10 seconds.

DTC No.DTC Detection ConditionTrouble Area
B2786No communication between the steering lock ECU (steering lock actuator assembly) and certification ECU (smart key ECU assembly) for more than 10 seconds.Steering lock ECU (steering lock actuator assembly) Certification ECU (smart key ECU assembly) Wire harness or connector STR LOCK fuse

Scheme 90

Scheme 90: WIRING DIAGRAM

This DTC is stored when LIN communication between the certification ECU (smart key ECU assembly) and steering lock ECU (steering lock actuator assembly) stops for more than 10 seconds.

DTC No.DTC Detection ConditionTrouble Area
B2786No communication between the steering lock ECU (steering lock actuator assembly) and certification ECU (smart key ECU assembly) for more than 10 seconds.Steering lock ECU (steering lock actuator assembly) Certification ECU (smart key ECU assembly) Wire harness or connector STR LOCK fuse

This DTC is stored when LIN communication between the certification ECU (smart key ECU assembly) and ID code box (immobilizer code ECU) stops for more than 10 seconds.

DTC No.DTC Detection ConditionTrouble Area
B2789No communication between the certification ECU (smart key ECU assembly) and ID code box (immobilizer code ECU) for more than 10 seconds.ID code box (immobilizer code ECU) Certification ECU (smart key ECU assembly) Wire harness or connector IMMOBI fuse

Scheme 91

Scheme 91: WIRING DIAGRAM

This DTC is stored when LIN communication between the certification ECU (smart key ECU assembly) and ID code box (immobilizer code ECU) stops for more than 10 seconds.

DTC No.DTC Detection ConditionTrouble Area
B2789No communication between the certification ECU (smart key ECU assembly) and ID code box (immobilizer code ECU) for more than 10 seconds.ID code box (immobilizer code ECU) Certification ECU (smart key ECU assembly) Wire harness or connector IMMOBI fuse

This DTC is stored when LIN communication between the certification ECU (smart key ECU assembly) and power management control ECU stops for more than 10 seconds.

DTC CodeDTC Detection ConditionTrouble Area
B278CNo communication between the certification ECU (smart key ECU assembly) and power management control ECU for more than 10 seconds.Power management control ECU Certification ECU (smart key ECU assembly) Wire harness or connector AM2 fuse

Scheme 92

Scheme 92: WIRING DIAGRAM

This DTC is stored when LIN communication between the certification ECU (smart key ECU assembly) and power management control ECU stops for more than 10 seconds.

DTC CodeDTC Detection ConditionTrouble Area
B278CNo communication between the certification ECU (smart key ECU assembly) and power management control ECU for more than 10 seconds.Power management control ECU Certification ECU (smart key ECU assembly) Wire harness or connector AM2 fuse