RM38T0EC _57 Power Source / Network _104409 NETWORKING _0510092 LIN COMMUNICATION SYSTEM C

NETWORKING  LIN COMMUNICATION SYSTEM  B278588  Communication between ECUs connected by LIN Bus off  


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 B278588 will be stored.

DTC No. Detection Item DTC Detection Condition Trouble Area
B278588 Communication between ECUs connected by LIN Bus off
·

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.


·

Wire harness or connector

·

ID code box (immobiliser code ECU)

·

Certification ECU (smart key ECU assembly)



WIRING DIAGRAM

C462589E01
2.979,0.646 3.135,0.844 0.156,0.198 10 false 8 4.073,0.646 4.229,0.844 0.156,0.198 10 false 2 2.646,0.813 3.104,1.01 0.458,0.198 10 false LIN 4.292,0.823 4.75,1.021 0.458,0.198 10 false LIN1 1.323,1.333 1.938,1.531 0.615,0.198 10 false I222 1.313,1.5 3.115,2.031 1.802,0.531 10 false Certification ECU (Smart Key ECU Assembly) 4.208,1.333 4.667,1.531 0.458,0.198 10 false I20 4.208,1.5 7.135,1.75 2.927,0.25 10 false ID Code Box (Immobiliser Code ECU) 0.729,2.458 4.396,2.656 3.667,0.198 10 false : LIN Communication Line

CAUTION / NOTICE / HINT

NOTICE:
·

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) or ID code box (immobiliser code ECU), refer to Service Bulletin.



PROCEDURE

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

Disconnect the I222 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 Switch Condition Specified Condition
I222-8 (LIN) - I20-2 (LIN1) Ignition switch off Below 1 Ω
I222-8 (LIN) - Body ground Always 10 kΩ or higher
I20-2 (LIN1) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

2.CLEAR DTC

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.CLEAR DTC
a.

Connect the I222 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 440
Result:
Proceed to
NEXT




NEXT

3.CHECK FOR DTC
3.CHECK FOR DTC
a.

Check for DTCs.

Body Electrical > Entry&Start > Trouble Codes
50001 440
Result:
Result Proceed to
B278588 is not output A
B278588 is output B




A

REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

B

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)