LIN Communication System (Diagnostic Codes): Overview

DESCRIPTION

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

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B278C	Lost Communication with Power Source Control	An internal malfunction occurs in the certification ECU (smart key ECU assembly).	Certification ECU (smart key ECU assembly)

HINT

The power management control ECU is built into the certification ECU (smart key ECU assembly).

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

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B2789	No Response from ID BOX	No communication between certification ECU (smart key ECU assembly) and ID code box (immobilizer code ECU) for 10 seconds or more.	ID code box (immobilizer code ECU) Certification ECU (smart key ECU assembly) Wire harness or connector SMART fuse

Scheme 112

Scheme 112: 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 10 seconds or more.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B2786	No Response from Steering Lock ECU	No communication between steering lock ECU (steering lock actuator assembly) and certification ECU (smart key ECU assembly) for 10 seconds or more.	Steering lock ECU (steering lock actuator assembly) Certification ECU (smart key ECU assembly) Wire harness or connector STRG LOCK fuse

Scheme 113

Scheme 113: 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.	Detection Item	DTC Detection Condition	Trouble Area
B2785	Communication Malfunction between ECUs Connected by LIN	Errors in LIN communication between ECUs or an open or short in communication lines. LIN communication error detected by the certification ECU (smart key ECU assembly) 3 times in a row.	Certification ECU (smart key ECU assembly) Steering lock ECU (steering lock actuator assembly) ID code box (immobilizer code ECU) Wire harness or connector STRG LOCK fuse SMART fuse

Scheme 114

Scheme 114: 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.	Detection Item	DTC Detection Condition	Trouble Area
B2325	LIN Communication Bus Malfunction	Main body ECU (multiplex network body ECU) detects errors in communication with the ECUs connected to the door bus lines 3 times in a row.	Power window regulator motor assembly (for driver door) Power window regulator motor assembly (for front passenger door) Power window regulator motor assembly (for rear RH door) Power window regulator motor assembly (for rear LH door) Multiplex network master switch assembly Sliding roof ECU (sliding roof drive gear sub-assembly)* Main body ECU (multiplex network body ECU) Instrument panel junction block assembly Wire harness or connector P/W fuse DOOR F/L fuse DOOR F/R fuse DOOR R/L fuse DOOR R/R fuse S/ROOF fuse*

*: w/ Sliding Roof System

Scheme 115

Scheme 115: WIRING DIAGRAM

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

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B2324	Rear Door LH ECU Communication Stop	No communication between power window regulator motor assembly (for rear LH door) and main body ECU (multiplex network body ECU) for 10 seconds or more.	Power window regulator motor assembly (for rear LH door) Main body ECU (multiplex network body ECU) Instrument panel junction block assembly Wire harness or connector DOOR R/L fuse

Scheme 116

Scheme 116: WIRING DIAGRAM

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

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B2323	Rear Door RH ECU Communication Stop	No communication between power window regulator motor assembly (for rear RH door) and main body ECU (multiplex network body ECU) for 10 seconds or more.	Power window regulator motor assembly (for rear RH door) Main body ECU (multiplex network body ECU) Instrument panel junction block assembly Wire harness or connector DOOR R/R fuse

Scheme 117

Scheme 117: WIRING DIAGRAM

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

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B2322	Front Passenger Side Door ECU Communication Stop	No communication between power window regulator motor assembly (for front passenger door) and main body ECU (multiplex network body ECU) for 10 seconds or more.	Power window regulator motor assembly (for front passenger door) Main body ECU (multiplex network body ECU) Instrument panel junction block assembly Wire harness or connector DOOR F/R fuse

Scheme 118

Scheme 118: WIRING DIAGRAM

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

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B2321	Driver Side Door ECU Communication Stop	No communication between power window regulator motor assembly (for driver door) and main body ECU (multiplex network body ECU) for 10 seconds or more.	Power window regulator motor assembly (for driver door) Main body ECU (multiplex network body ECU) Wire harness or connector DOOR F/L fuse

Scheme 119

Scheme 119: 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 10 seconds or more.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B1206	P/W Master Switch Communication Stop	No communication between multiplex network master switch assembly and main body ECU (multiplex network body ECU) for 10 seconds or more.	Multiplex network master switch assembly Main body ECU (multiplex network body ECU) Instrument panel junction block assembly Wire harness or connector P/W fuse

Scheme 120

Scheme 120: WIRING DIAGRAM

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

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B1273	Sliding Roof ECU Communication Stop	No communication between sliding roof ECU (sliding roof drive gear sub-assembly) and main body ECU (multiplex network body ECU) for 10 seconds or more.	Sliding roof ECU (sliding roof drive gear sub-assembly) Main body ECU (multiplex network body ECU) Instrument panel junction block assembly Wire harness or connector S/ROOF fuse

Scheme 121

Scheme 121: WIRING DIAGRAM

See also:
• REMOVAL [04/2013 - ]
• REMOVAL [04/2013 - ]

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