BYD B-BOX 2.5 - Normal Alarm and Solution Display on B-Plus 2.5; Normal Alarm and Solution Display on BMU

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W944(XW09DcHiChgCur)
External Warning - Battery High Current
Charge
Normal alarm and do not need to deal with;
W953
External Warning –Ext BMS Timeout
1.Check the CAN communication, to make
sure connect well.
2.Change BMU.
9.2 Normal alarm and solution display on B-Plus 2.5
B-Plus display info
Reason
Solution
LED
Yellow led(Alarm) blinks for
0.5Hz，other led are on off
continuously;
Battery is power off abnormally;
1.Press "on/off" button for 2-3 sec
until battery can work normal;
2.If yellow blinks continuously, the
battery needs to be changed;
Yellow led (Alarm), Yellow
led on and buzzing with 4
times.
The battery needs to be
protected or external connection is
incorrect;
1.Power off the battery;
2.Inspect short/reverse connection of
cable between P+&P-;
3.If short/reverse connection is
confirmed, please reconnect cable
correctly;
4.restart battery;
The merry-go-round
No communication with BMU
1. Check the cables between
BMU and batteries;
2. Confirm the connection
is reliable or not
Buzzer
Buzzing for 4 times
Short/reverse connection；
1.Power off;
2.Inspect short/reverse connection of
cable between P+&P-;
3.If short/reverse connection is
confirmed, please reconnect cable
correctly;
4.restart battery;
9.3 Normal alarm and solution display on BMU
Status(display interval
2S)
Definition
LED
Blinks 1 time
Inverter not connected
Blinks 2 time
Battery not connected
Blinks 3 time
Battery disconnect
Blinks 4 time
Battery failure