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:
Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART
Main Body ECU (Multiplex Network Body ECU)
DTC Code
Detection Item
See page
B1206
P/W Master Switch Communication Stop
B1273
Sliding Roof ECU Communication Stop
...
Precaution
PRECAUTION
PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE BATTERY TERMINAL
NOTICE:
When disconnecting the cable from the negative (-) battery terminal, initialize
the following systems after the cable is reconnected.
Click here
IGNITION SWITCH EXPRESSIONS
(a) The type of ignition switch ...
Wireless Charger Illumination Circuit
DESCRIPTION
When the light control switch is turned to the tail or head position, this circuit
sends an illumination signal to the mobile wireless charger cradle assembly. Based
on this signal, the mobile wireless charger cradle assembly dims the indicator lights
(green and amber).
WIRING DI ...
