Toyota Tacoma (2015-2018) Service Manual: Lost Communication with Power Source Control (B278C)
DESCRIPTION
|
DTC No. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
B278C |
An internal malfunction occurs in the certification ECU (smart key ECU assembly) |
|
CAUTION / NOTICE / HINT
NOTICE:
- When using the Techstream with the vehicle ignition switch off, connect the Techstream to the vehicle and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Access. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
- If the certification ECU (smart key ECU assembly) is replaced, register
the keys (See page
.gif)
).
PROCEDURE
|
1. |
CLEAR DTC |
(a) Clear the DTCs (See page ).
|
.gif)
|
2. |
CHECK FOR DTC |
(a) Check for DTCs (See page ).
OK:
DTC B278C is not output.
| OK | .gif) |
USE SIMULATION METHOD TO CHECK |
| NG | |
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
P/W Master Switch Communication Stop (B1206)
DESCRIPTION
This DTC is stored when LIN communication between the power window regulator
master switch assembly and main body ECU (multiplex network body ECU) stops for
10 seconds or more.
...
Front Passenger Side Door ECU Communication Stop (B2322)
DESCRIPTION
This DTC is stored when LIN communication between the front power window regulator
motor assembly RH and main body ECU (multiplex network body ECU) stops for 10 seconds
or more.
...
Other materials:
Installation
INSTALLATION
PROCEDURE
1. INSTALL RADIATOR ASSEMBLY
(a) Engage the 2 hooks and temporarily install the radiator assembly to the radiator
support sub-assembly.
(b) Install the radiator assembly with the 4 bolts.
Torque:
18 N·m {184 kgf·cm, 13 ft·lbf}
2. INSTALL FAN SHROUD
(a) Install th ...
Power Source Control ECU Malfunction (B2782)
DESCRIPTION
DESCRIPTION The certification ECU (smart key ECU assembly) has a power source
mode switching function.
This DTC is stored when the IGE input (the steering lock motor activation permission
signal) sent directly from the certification ECU (smart key ECU assembly) to the
steering lo ...
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
Use these procedure to troubleshoot the seat belt warning system.
*: Use the Techstream.
PROCEDURE
1.
VEHICLE BROUGHT TO WORKSHOP
NEXT
2 ...
