Dont start when jumped car blinkers start flashing rapidly car lock 2010 enclave

Sounds almost like a false activation of a security system. If battery voltage is exceptionally low, it may set off various electrical concerns. Check the battery condition and state of charge first and ensure a known good battery is in place. Then recheck. If the problem occurs still even with a fully charged battery able to handle a load, then further electrical testing will need to be performed. Note also that any aftermarket alarms should be disabled and removed prior to further troubleshooting.