DTC B2303: Communication Error from Backup Relay (BURDIAG1) to Sub Battery Module [12/2017 - 10/2023]: Description
The sub-battery module assembly receives RD11 signals from the backup relay.
RD11 signals are PWM communication (Pulse Width Modulation: Modulates pulse width according to duty ratio) and indicates the closed/open condition of the backup relay.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Warning Indicate | Memory |
|---|---|---|---|---|---|
| B2303 | Communication Error from Backup Relay (BURDIAG1) to Sub Battery Module | This DTC is stored when a malfunction is detected in communication from the backup relay (RD11) to the sub-battery module assembly continuously for 10 seconds. (3 trip detection logic) |
|
Comes on | DTC stored |
HINT:
The details of a DTC can be checked by using the DTC Sub Code of the freeze frame data that was recorded when the DTC was output.
| DTC Sub Code | Detail |
|---|---|
| "3B" | Open or short to +B in backup relay signal line (RD11) |
| "3C" | Short to ground in backup relay signal line (RD11) |
| "3D" | Waveform malfunction in backup relay signal line (RD11) |