Happen to encounter this weird issue.
Was at Bukit Timah along Dunearn road.
I stopped by my car and tried to lock the car.......LED indicator did lit up but car did not respond.
Tried many times from different angle of car......no difference.
But when i tried unlocking button......car responded.
Locked up my car using key first.
After i left the place......the car key transponder works perfectly well for both lock and unlock.
Anyone had such experience to share what's the reason for occurrence?