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. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
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 |
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 |
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:
Click here
|
4. |
REGISTER ECU CODE REGISTRATION |
(a) Register the recognition codes in the ECUs.
|
5. |
CLEAR DTC |
(a) Clear the DTCs.
Body Electrical > Smart Key > Clear DTCs
|
6. |
CHECK FOR DTC |
(a) Check for DTCs.
Body Electrical > Smart Key > Trouble Codes
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) |