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

NETWORKING  LIN COMMUNICATION SYSTEM  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
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.
·

Wire harness or connector

·

ID code box (immobiliser code ECU)

·

Certification ECU (smart key ECU assembly)



WIRING DIAGRAM

C462590E01
4.458,0.323 5.958,0.677 1.5,0.354 10 false from Auxiliary Battery 5.375,0.885 5.781,1.177 0.406,0.292 10 false 1 5.615,1.177 6.51,1.573 0.896,0.396 10 false ECU-B NO. 1 5.073,1 5.479,1.292 0.406,0.292 10 false +B 4.958,2.188 5.365,2.479 0.406,0.292 10 false GND 5.375,2.063 5.781,2.354 0.406,0.292 10 false 5 4.125,1.688 4.531,1.979 0.406,0.292 10 false LIN1 3.917,1.521 4.323,1.813 0.406,0.292 10 false 2 2.5,1.531 2.906,1.823 0.406,0.292 10 false 8 1.104,2.656 1.615,2.948 0.51,0.292 10 false I222 1.083,2.823 2.615,3.365 1.531,0.542 10 false Certification ECU (Smart Key ECU Assembly) 0.729,3.469 2.76,3.698 2.031,0.229 10 false : LIN Communication Line 3.969,2.677 4.375,2.969 0.406,0.292 10 false I20 3.969,2.854 5.542,3.396 1.573,0.542 10 false ID Code Box (Immobiliser Code ECU) 2.188,1.698 2.594,1.99 0.406,0.292 10 false LIN

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, 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.

·

If the certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU) is 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 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.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 Switch Condition Specified Condition
I20-1 (+B) - I20-5 (GND) Ignition switch off 11 to 14 V



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).

Result:
Proceed to
NEXT




NEXT

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

Register the recognition codes in the ECUs.

Result:
Proceed to
NEXT




NEXT

5.CLEAR DTC
5.CLEAR DTC
a.

Clear the DTCs.

Body Electrical > Entry&Start > Clear DTCs
50002 440
Result:
Proceed to
NEXT




NEXT

6.CHECK FOR DTC
6.CHECK FOR DTC
a.

Check for DTCs.

Body Electrical > Entry&Start > Trouble Codes
50001 440
Result:
Result Proceed to
B278987 is not output A
B278987 is output B




A

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

B

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)