Toyota Yaris: Lin Communication System / Communication between ECUs connected by LIN Bus off (B278588)
DESCRIPTION
This DTC is stored when LIN communication between the certification ECU (smart key ECU assembly) and steering lock ECU (steering lock actuator or upper bracket assembly) stops for 10 seconds or more.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| B278588 | Communication between ECUs connected by LIN Bus off | No communication between steering lock ECU (steering lock actuator or upper bracket assembly) and certification ECU (smart key ECU assembly) for 10 seconds or more. |
|
WIRING DIAGRAM
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.
- Before replacing the certification ECU (smart key ECU assembly) or steering lock ECU (steering lock actuator or upper bracket assembly), refer to Registration.
PROCEDURE
| 1. | CLEAR DTC |
(a) Clear the DTCs.
Body Electrical > Smart Key > Clear DTCs
|
| 2. | CHECK FOR DTC |
(a) Check for DTCs.
Body Electrical > Smart Key > Trouble Codes| Result | Proceed to |
|---|---|
| DTC 278588 is output | A |
| DTC 278588 is not output | B |
| B |
 | USE SIMULATION METHOD TO CHECK |
|
| 3. | CLEAR DTC |
(a) Clear the DTCs.
Body Electrical > Smart Key > Clear DTCs
|
| 4. | CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) |
(a) Disconnect the H71 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
(b) Check for DTCs.
Body Electrical > Smart Key > Trouble Codes| Result | Proceed to |
|---|---|
| DTC 278588 is output | A |
| DTC 278588 is not output | B |
| B |
 | REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) |
|
| 5. | CLEAR DTC |
(a) Clear the DTCs.
Body Electrical > Smart Key > Clear DTCs
|
| 6. | CHECK ID CODE BOX (IMMOBILISER CODE ECU) |
(a) Disconnect the H67 ID code box (immobiliser code ECU) connector.
(b) Check for DTCs.
Body Electrical > Smart Key > Trouble Codes| Result | Proceed to |
|---|---|
| DTC 278588 is output | A |
| DTC 278588 is not output | B |
| B |
 | REPLACE ID CODE BOX (IMMOBILISER CODE ECU) |
|
| 7. | CLEAR DTC |
(a) Clear the DTCs.
Body Electrical > Smart Key > Clear DTCs
|
| 8. | CHECK HARNESS AND CONNECTOR |
(a) Disconnect the H46 certification ECU (smart key ECU assembly) connector.
(b) Disconnect the H67 ID code box (immobiliser code ECU) connector.
(c) Disconnect the H71 steering lock ECU (steering lock actuator or upper bracket assembly) connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| H46-8 (LIN) - H71-5 (LIN) | Always | Below 1 Ω |
| H46-8 (LIN) - Body ground | Always | 10 kΩ or higher |
| OK |
 | REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
| NG |
 | REPAIR OR REPLACE HARNESS OR CONNECTOR |
Steering Lock System Missing Message (B278187)
DESCRIPTION This DTC is stored when LIN communication between the certification ECU (smart key ECU assembly) and steering lock ECU (steering lock actuator or upper bracket assembly) stops for 10 seconds or more...
ID-BOX Missing Message (B278987)
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...
Other information:
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Refueling
Before refueling, close all the doors, windows, and the liftgate/trunk lid, and switch the ignition OFF.
To open the fuel-filler lid, pull the remote fuel-filler lid release.
