DESCRIPTION
This DTC is stored when LIN communication between the certification ECU (smart key ECU assembly) and power management control ECU stops for more than 10 seconds.
DTC Code |
DTC Detection Condition |
Trouble Area |
---|---|---|
B278C |
No communication between the certification ECU (smart key ECU assembly) and power management control ECU for more than 10 seconds. |
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Connect the Techstream to the DLC3, and turn the courtesy switch on and off at 1.5-second intervals until communication between the Techstream and vehicle begins.
PROCEDURE
1. |
CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BATTERY AND BODY GROUND) |
(a) Disconnect the D43 ECU connector. |
|
(b) Measure the resistance and voltage according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
D43-5 (GND2) - Body ground |
Always |
Below 1 Ω |
D43-6 (GND) - Body ground |
Always |
Below 1 Ω |
Standard Voltage:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
D43-1 (AM22) - Body ground |
Always |
11 to 14 V |
D43-2 (AM21) - Body ground |
Always |
11 to 14 V |
*1 |
Power Management Control ECU |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
2. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - POWER MANAGEMENT CONTROL ECU) |
(a) Disconnect the D25 ECU connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
D25-29 (LIN) - D43-24 (LIN2) |
Always |
Below 1 Ω |
D25-29 (LIN) - Body ground |
Always |
10 kΩ or higher |
*1 |
Front view of wire harness connector (to Certification ECU (Smart Key ECU Assembly)) |
*2 |
Front view of wire harness connector (to Power Management Control ECU) |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
3. |
REPLACE POWER MANAGEMENT CONTROL ECU |
(a) Replace the power management control ECU (See page
).
|
4. |
CHECK DTC OUTPUT |
(a) Clear the DTC (See page ).
(b) Recheck for DTCs.
OK:
DTC B278C is not output.
OK | ![]() |
END (POWER MANAGEMENT CONTROL ECU WAS DEFECTIVE) |
NG | ![]() |
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
Cold Start Ignition Timing Performance (P050B)
DESCRIPTION
This monitor will run when the engine is started at an engine coolant temperature
of -10 to 50°C (14 to 122°F). The DTC is stored after the engine idles for 13
seconds (2 trip detection logic).
The DTC is designed to monitor the ignition ti ...
LVDS Signal Malfunction (from Extension Module) (B1532)
DESCRIPTION
The stereo component tuner assembly and the navigation receiver assembly are
connected by the LVDS communication line.
This DTC is stored when an LVDS communication error occurs between the stereo
component tuner assembly and the navigation r ...
Lost Communication with Automatic High Beam Sensor (B2432)
DESCRIPTION
The DTC is stored when the AFS ECU (headlight swivel ECU assembly) detects malfunctions
in the LIN communication system.
DTC No.
DTC Detection Condition
Trouble Area
B2432
Malfunction ...