Mercedes alarm/central locking - AM
Hi

I have a Merc 300sl 1990.I disconnected the battery to recharge it and now the alarm(factory fit) cannot be activated via the infra-red remote. Before I disconnected the battery when locking the car the red LED on the door handles used to light up and when unlocking the green LED used to come on. Now the LEDs do not light up although the remote does unlock and lock the car.
Alarm is not activated by remote but can be activated by locking/unlocking car with key.

Advice appreciated

AM