RM3660EC _57 Power Source / Network _080743 NETWORKING _0600577 LIN COMMUNICATION SYSTEM(for NR Series Engine) C

NETWORKING  LIN COMMUNICATION SYSTEM(for NR Series Engine)  B2785  Communication Malfunction between ECUs Connected by LIN  


DESCRIPTION

If the certification ECU (smart key ECU assembly) detects a communication error with an ECU connected to the certification bus lines for 7 seconds or more, 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.

·

The certification ECU (smart key ECU assembly) detects a communication error with an ECU connected to the certification bus lines for 7 seconds or more.


·

Certification ECU (smart key ECU assembly)

·

Steering lock ECU (steering lock actuator or upper bracket assembly)

·

ID code box (immobiliser code ECU)

·

Wire harness or connector



WIRING DIAGRAM

B486902E05
0.375,1.49 0.823,1.75 0.448,0.26 10 false I1 0.365,1.646 1.885,2.104 1.521,0.458 10 false Certification ECU (Smart Key ECU Assembly) 1.667,0.958 2.115,1.219 0.448,0.26 10 false LIN 4.385,1.469 5.375,1.729 0.99,0.26 10 false I59 4.375,1.635 7.052,2.167 2.677,0.531 10 false Steering Lock ECU (Steering Lock Actuator or Upper Bracket Assembly) 5.208,3.313 5.656,3.573 0.448,0.26 10 false I20 5.188,3.49 6.771,3.917 1.583,0.427 10 false ID Code Box (Immobiliser Code ECU) 0.719,4.333 2.49,4.813 1.771,0.479 10 false : LIN Communication Line 5.094,2.646 5.542,2.906 0.448,0.26 10 false 2 5.094,0.792 5.542,1.052 0.448,0.26 10 false 5 1.99,0.802 2.438,1.063 0.448,0.26 10 false 14 5.292,0.948 5.74,1.208 0.448,0.26 10 false LIN 5.281,2.781 5.729,3.042 0.448,0.26 10 false LIN1

CAUTION / NOTICE / HINT

NOTICE:
·

Before performing the inspection, check that DTC B2786, B2789 or B278C is not output.

Click herePower Source / Network>NETWORKING>LIN COMMUNICATION SYSTEM (for NR Series Engine)>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.

·

Before replacing the certification ECU (smart key ECU assembly), ID code box (immobiliser code ECU) or steering lock ECU (steering lock actuator or upper bracket assembly), refer to Service Bulletin.



PROCEDURE

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

Disconnect the I1 certification ECU (smart key ECU assembly) connector.


b.

Disconnect the I59 steering lock ECU (steering lock actuator or upper bracket assembly) connector.


c.

Disconnect the I20 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
I1-14 (LIN) - I59-5 (LIN) Ignition switch off Below 1 Ω
I1-14 (LIN) - I20-2 (LIN1) Ignition switch off Below 1 Ω
I1-14 (LIN), I59-5 (LIN) or I20-2 (LIN1) - Body ground Ignition switch off 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

2.CHECK FOR DTC (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.CHECK FOR DTC (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))
a.

Connect the I1 certification ECU (smart key ECU assembly) connector.


b.

Connect the I20 ID code box (immobiliser code ECU) connector.


c.

Clear the DTCs.

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 FOR DTC (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))

B

REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY)

Click hereSteering>STEERING COLUMN>STEERING COLUMN ASSEMBLY>DISASSEMBLY


3.CHECK FOR DTC (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))
a.

Connect the I59 steering lock ECU (steering lock actuator or upper bracket assembly) connector.


b.

Disconnect the I20 ID code box (immobiliser code ECU) connector.


c.

Clear the DTCs.

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)