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

NETWORKING  LIN COMMUNICATION SYSTEM(except NR Series Engine)  B278987  ID-BOX Missing Message  


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
B278987 ID-BOX Missing Message No communication between certification ECU (smart key ECU assembly) and ID code box (immobiliser code ECU) 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

B589804E42
0.76,2.323 4.427,2.521 3.667,0.198 10 false : LIN Communication Line 0.292,1.677 2.104,2.115 1.813,0.438 10 false Certification ECU (Smart Key ECU Assembly) 0.292,1.51 0.75,1.708 0.458,0.198 10 false I196 1.667,0.969 2.125,1.167 0.458,0.198 10 false LIN 2.01,0.802 2.469,1 0.458,0.198 10 false 8 3.083,0.802 3.542,1 0.458,0.198 10 false 2 3.292,0.969 3.75,1.167 0.458,0.198 10 false LIN1 4.552,0.802 5.01,1 0.458,0.198 10 false +B 4.438,1.146 4.896,1.344 0.458,0.198 10 false GND 3.229,1.677 4.813,2.229 1.583,0.552 10 false ID Code Box (Immobiliser Code ECU) 3.229,1.51 3.688,1.708 0.458,0.198 10 false I20 6.208,0.802 7.063,1.219 0.854,0.417 10 false from Auxiliary Battery 5.073,0.969 6.104,1.375 1.031,0.406 10 false ECU-B NO. 1 4.854,0.667 5.313,0.865 0.458,0.198 10 false 1 4.865,1.021 5.323,1.219 0.458,0.198 10 false 5

CAUTION / NOTICE / HINT

NOTICE:
·

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

·

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.

·

If the certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU) is replaced, 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 HARNESS AND CONNECTOR (ID CODE BOX (IMMOBILISER CODE ECU) - AUXILIARY BATTERY AND BODY GROUND)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.CHECK HARNESS AND CONNECTOR (ID CODE BOX (IMMOBILISER CODE ECU) - AUXILIARY BATTERY AND BODY GROUND)
a.

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

Standard Voltage:
Tester Connection Condition Specified Condition
I20-1 (+B) - Body ground Always*1
Ignition switch off*2 		11 to 14 V


*1: for Gasoline Model

*2: for HV Model



b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
I20-5 (GND) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

3.REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.REPLACE ID CODE BOX (IMMOBILISER CODE ECU)
a.

Replace the ID code box (immobiliser code ECU).

HINT:

Refer to Service Bulletin.



Result:
Proceed to
NEXT



NEXT

4.REGISTER ECU CODE REGISTRATION
4.REGISTER ECU CODE REGISTRATION
a.

Register the recognition codes in the ECUs.

HINT:

Refer to Service Bulletin.



Result:
Proceed to
NEXT



NEXT

5.CHECK FOR DTC
5.CHECK FOR DTC
a.

Clear the DTCs.

Body Electrical > Entry&Start > Clear DTCs
50002 440

b.

Recheck for DTCs.

Body Electrical > Entry&Start > Trouble Codes
50001 440
OK:

DTC B278987 is not output.



Result:
Proceed to
OK
NG



OK

END (ID CODE BOX (IMMOBILISER CODE ECU) WAS DEFECTIVE)

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)