Multiplex Communication (Except Hybrid): Overview Toyota Highlander II

SYSTEM DESCRIPTION

1. LIN COMMUNICATION SYSTEM DESCRIPTION Multiplex communication system (LIN) is used to control communication between the ECUs of the body system. If communication cannot be performed through LIN because of an open in the communication lines or other reason, the master control ECU of the relevant system will output a DTC. For the communication system and the connected ECUs, refer to the table below. HINT: Each ECU has a fail safe function which activates to maintain the minimum performance of the system and protect the system. Door System LIN Communication System DOOR SYSTEM LIN COMMUNICATION SYSTEM REFERENCE ECU Master Control (UN Communication DTC Output Function) Main Body ECU o (with output function) Front Power Window ECU x (without output function) Sliding Roof ECU *1 x (without output function) HINT: *1: Models with Sliding Roof Certification System LIN Communication System CERTIFICATION SYSTEM LIN COMMUNICATION SYSTEM REFERENCE ECU Master Control (LIN Communication DTC Output Function) Certification ECU o (with output function) Main Body ECU x (without output function) Steering Lock ECU x (without output function) ID Code Box x (without output function) Air Conditioning LIN Communication System AIR CONDITIONING LIN COMMUNICATION SYSTEM REFERENCE Component Master Control (LIN Communication DTC Output Function) Air Conditioning Amplifier Assembly o (with output function) A/C Control Assembly (for Front) x (without output function) A/C Control Assembly (for Rear) x (without output function)

DESCRIPTION

This DTC is output when LIN communication between the sliding roof ECU (sliding roof drive gear) and main body ECU (instrument panel junction block assembly) stops for more than 10 seconds.

DIAGNOSTIC TROUBLE CODE TABLE

Scheme 253

This DTC is output when there is an open, short or ECU communication malfunction between the main body ECU (instrument panel junction block assembly) and certification ECU (smart key ECU assembly).

DIAGNOSTIC TROUBLE CODE TABLE

Scheme 254

This DTC is output when LIN communication between the front power window regulator motor assembly LH and main body ECU (instrument panel junction block assembly) stops for more than 10 seconds.

DIAGNOSTIC TROUBLE CODE TABLE

Scheme 255

The main body ECU (instrument panel junction block assembly) monitors communication between all the ECUs connected to the door system LIN bus lines. When the main body ECU (instrument panel junction block assembly) detects errors in communication with all the ECUs connected to the door system LIN bus lines at 2.6-second intervals and 3 times in a row, DTC B2325 will be output.

DIAGNOSTIC TROUBLE CODE TABLE

Scheme 256

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

DIAGNOSTIC TROUBLE CODE TABLE

Scheme 257

This DTC is output 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.

DIAGNOSTIC TROUBLE CODE TABLE

Scheme 258

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

DIAGNOSTIC TROUBLE CODE TABLE

Scheme 259

See also:
• LIN COMMUNICATION CIRCUIT