BYD M6 Owner's Manual page 22

If Smart Key Battery Depleted
The battery of the electronic smart
key may have depleted if its indicator
doesn't flash, or if the keyless start
function doesn't work. Replace the
battery following the instructions in
"Replace Battery in Electronic Smart
Key" in this chapter.
In this case, you can start the engine
with the card key.
If the card key is not available or if its
battery also has depleted, you can
start the engine in the following steps:
1. Step down the brake pedal or
press down the Start button, the
indicator for the keyless entry and
start system turns on with the
buzzer beeping once.
2. Put the electronic smart key near
the Start button within 30 seconds
after the buzzer beeps, the buzzer
beeps once again, indicating that
you can start the engine.
Key & Doors 1-14
BYD M6 AUTO Owner's Manual
3. Start the engine within 5 seconds
after the buzzer beeps for the
second time.
You can also start the engine by
conducting the procedure above with
a card key.
Start
Stop
If you cannot get into the vehicle or
start the engine with the card key, the
battery may have depleted. Please
replace the battery following the
instructions in "Replace Battery in
Card Key" in this chapter.