| Last Modified: 01-30-2024 | 6.11:8.1.0 | Doc ID: RM100000001FNID |
| Model Year Start: 2019 | Model: RAV4 | Prod Date Range: [11/2018 - ] |
| Title: NETWORKING: LIN COMMUNICATION SYSTEM: B278C; Lost Communication with Power Source Control; 2019 - 2024 MY RAV4 RAV4 HV [11/2018 - ] | ||
|
DTC |
B278C |
Lost Communication with Power Source Control |
DESCRIPTION
When an internal malfunction is detected in the certification ECU (smart key ECU assembly), this DTC is stored.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
|---|---|---|---|
|
B278C |
Lost Communication with Power Source Control |
An internal malfunction occurs in the certification ECU (smart key ECU assembly). |
Certification ECU (smart key ECU assembly) |
CAUTION / NOTICE / HINT
NOTICE:
-
When using the Techstream with the ignition switch off to troubleshoot:
Connect the Techstream to the vehicle and turn a courtesy light switch on and off at 1.5 second intervals until communication between the Techstream and vehicle begins.
-
Before replacing the certification ECU (smart key ECU assembly) or steering lock actuator assembly, refer to the smart key system (for start function).
for HV Model: Click here
![2019 MY RAV4 HV [11/2018 - 10/2019]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): REGISTRATION](/t3Portal/stylegraphics/info.gif)
for Gasoline Model: Click here
PROCEDURE
|
1. |
CHECK FOR DTC |
(a) Clear the DTCs.
Click here
Body Electrical > Smart Key > Clear DTCs
(b) Check for DTCs.
Click here
Body Electrical > Smart Key > Trouble Codes
OK:
DTC B278C is not output.
| OK |
|
| NG |
|
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
|
|
|