NETWORKING  LIN COMMUNICATION SYSTEM  B2785  Communication Malfunction between ECUs Connected by LIN  


DESCRIPTION

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 (immobiliser code ECU)

·

Wire harness or connector

·

STRG LOCK fuse

·

ECU-B NO. 2 fuse



WIRING DIAGRAM

B333672E70
0.521,2.26 2.031,2.76 1.51,0.5 10 false Certification ECU (Smart Key ECU Assembly) 3.083,2.24 4.865,2.844 1.781,0.604 10 false Steering Lock ECU (Steering Lock Actuator Assembly) 2.885,4.75 5.448,5.042 2.563,0.292 10 false ID Code Box (Immobiliser Code ECU) 1.063,4.948 2.833,5.354 1.771,0.406 10 false : LIN Communication Line 6.146,1.156 7.042,1.51 0.896,0.354 10 false from Battery 6.125,3.646 7.021,4 0.896,0.354 10 false from Battery 0.531,2.104 0.979,2.354 0.448,0.25 10 false E110 3.083,1.24 3.271,1.448 0.188,0.208 10 false 5 2.094,1.25 2.448,1.458 0.354,0.208 10 false 17 1.781,1.406 2.135,1.615 0.354,0.208 10 false LIN 3.292,1.417 3.646,1.625 0.354,0.208 10 false LIN 4.198,1.615 4.552,1.823 0.354,0.208 10 false GND 4.385,1.177 4.74,1.385 0.354,0.208 10 false B 4.604,1.042 4.958,1.25 0.354,0.208 10 false 7 4.604,3.542 4.958,3.75 0.354,0.208 10 false 1 5.083,1.323 6.021,1.583 0.938,0.26 10 false STRG LOCK 3.083,2.083 3.438,2.292 0.354,0.208 10 false E112 3.094,3.771 3.281,3.979 0.188,0.208 10 false 2 3.281,3.938 3.688,4.146 0.406,0.208 10 false LIN1 4.302,3.656 4.656,3.865 0.354,0.208 10 false +B 4.198,4.115 4.552,4.323 0.354,0.208 10 false GND 4.594,1.521 4.948,1.729 0.354,0.208 10 false 1 4.615,4.021 4.802,4.229 0.188,0.208 10 false 5 2.885,4.583 3.729,4.771 0.844,0.188 10 false E106 5.063,3.823 6.167,4.125 1.104,0.302 10 false ECU-B NO. 2

CAUTION / NOTICE / HINT

NOTICE:
·

Inspect the fuses for circuits related to this system before performing the following procedure.

·

If the certification ECU (smart key ECU assembly) is replaced, register the keys (refer to Service Bulletin).

·

If the steering lock ECU (steering lock actuator assembly) is replaced, register the ECU code (refer to Service Bulletin).

·

If the ID code box (immobiliser code ECU) is replaced, register the ECU code and ECU communication ID (refer to Service Bulletin).

·

Before performing the inspection, check that DTC B2786 or B2789 is not output.

Click herePower Source / Network>NETWORKING>LIN COMMUNICATION SYSTEM>DTC CHECK / CLEAR

·

When using the GTS with the ignition switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start(CAN). While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.



PROCEDURE

1.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - EACH ECU)
a.

Disconnect the E110 certification ECU (smart key ECU assembly) connector.


b.

Disconnect the E112 steering lock ECU (steering lock actuator assembly) connector.


c.

Disconnect the E106 ID code box (immobiliser code ECU) connector.


d.

Measure the resistance according to the value(s) in the table below.

NOTICE:

Make sure that each ECU is in sleep mode before performing the inspection. To enter sleep mode, turn the ignition switch from ON to off and wait for 180 seconds or more without operating any switches.


Standard Resistance:
Tester Connection Condition Specified Condition
E110-17 (LIN) - E112-5 (LIN) Ignition switch off Below 1 Ω
E110-17 (LIN) - E106-2 (LIN1) Ignition switch off Below 1 Ω
E110-17 (LIN) - Body ground Ignition switch off 10 kΩ or higher
E112-5 (LIN) - Body ground Ignition switch off 10 kΩ or higher
E106-2 (LIN1) - Body ground Ignition switch off 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

2.CHECK DTC OUTPUT (STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY))

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.CHECK DTC OUTPUT (STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY))
a.

Reconnect the E110 certification ECU (smart key ECU assembly) connector.


b.

Reconnect the E106 ID code box (immobiliser code ECU) connector.


c.

Clear the DTCs.

Click herePower Source / Network>NETWORKING>LIN COMMUNICATION SYSTEM>DTC CHECK / CLEAR

Body Electrical > Entry&Start > Clear DTCs
50002 125

d.

Recheck for DTCs.

Body Electrical > Entry&Start > Trouble Codes
50001 125

Result:
Result Proceed to
DTC B2785 is output A
DTC B2785 is not output B



A

3.CHECK DTC OUTPUT (ID CODE BOX (IMMOBILISER CODE ECU))

B

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY)

Click hereSteering>STEERING COLUMN>STEERING COLUMN ASSEMBLY>DISASSEMBLY


3.CHECK DTC OUTPUT (ID CODE BOX (IMMOBILISER CODE ECU))
a.

Reconnect the E112 steering lock ECU (steering lock actuator assembly) connector.


b.

Disconnect the E106 ID code box (immobiliser code ECU) connector.


c.

Clear the DTCs.

Click herePower Source / Network>NETWORKING>LIN COMMUNICATION SYSTEM>DTC CHECK / CLEAR

Body Electrical > Entry&Start > Clear DTCs
50002 125

d.

Recheck for DTCs.

Body Electrical > Entry&Start > Trouble Codes
50001 125

Result:
Result Proceed to
DTC B2785 is output A
DTC B2785 is not output B



A

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

B

REPLACE ID CODE BOX (IMMOBILISER CODE ECU)