RM3660EC _57 Power Source / Network _080743 NETWORKING _0600578 LIN COMMUNICATION SYSTEM(except NR Series Engine) C

NETWORKING  LIN COMMUNICATION SYSTEM(except NR Series Engine)  B278588  Communication between ECUs connected by LIN Bus off  


DESCRIPTION

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

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from
B278588 Communication between ECUs connected by LIN Bus off No communication between ID code box (immobiliser code ECU) and certification ECU (smart key ECU assembly) for 10 seconds or more.
·

Certification ECU (smart key ECU assembly)

·

ID code box (immobiliser code ECU)

·

Wire harness or connector


Entry&Start

WIRING DIAGRAM

B646716E07
0.688,1.51 1.188,1.802 0.5,0.292 10 false I196 0.698,1.688 2.229,2.125 1.531,0.438 10 false Certification ECU (Smart Key ECU Assembly) 0.729,2.333 2.469,2.667 1.74,0.333 10 false : LIN Communication Line 4.698,1.51 6,1.823 1.302,0.313 10 false I20 4.698,1.698 7.042,1.969 2.344,0.271 10 false ID Code Box (Immobiliser Code ECU) 4.938,0.958 5.438,1.25 0.5,0.292 10 false LIN1 4.719,0.792 5.219,1.083 0.5,0.292 10 false 2 2.344,0.781 2.844,1.073 0.5,0.292 10 false 8 2.01,0.969 2.51,1.26 0.5,0.292 10 false LIN

CAUTION / NOTICE / HINT

NOTICE:
·

Before performing the inspection, check that DTC B278987 or B278C87 is not output.

Click herePower Source / Network>NETWORKING>LIN COMMUNICATION SYSTEM (except NR Series Engine)>HOW TO PROCEED WITH TROUBLESHOOTING

·

When using the GTS with the ignition switch off, perform lock and unlock operations using the door control switch of the multiplex network master switch assembly at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins, and then select the vehicle model manually.

Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start (CAN). While using the GTS, periodically perform lock and unlock operations using the door control switch of the multiplex network master switch assembly 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) or ID code box (immobiliser code ECU), refer to Service Bulletin.



PROCEDURE

1.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - ID CODE BOX (IMMOBILISER CODE ECU))
a.

Disconnect the I196 certification ECU (smart key ECU assembly) connector.


b.

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


c.

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
I196-8 (LIN) - I20-2 (LIN1) Ignition switch off Below 1 Ω
I196-8 (LIN) or I20-2 (LIN1) - Body ground Ignition switch off 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

2.CHECK FOR DTC

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.CHECK FOR DTC
a.

Connect the I196 certification ECU (smart key ECU assembly) connector.


b.

Clear the DTCs.

Body Electrical > Entry&Start > Clear DTCs
50002 440

c.

Recheck for DTCs.

Body Electrical > Entry&Start > Trouble Codes
50001 440

Result:
Result Proceed to
DTC B278588 is output A
DTC B278588 is not output B



A

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

B

REPLACE ID CODE BOX (IMMOBILISER CODE ECU)