R129 1994 SL320

[Tony Huntb]

Hi all. Car has been offroad over the winter and needed a new battery have installed one and now the car wont start. Not been using the central locking using the remote as that stopped working in the summer. Had been opening and closing the car using the blade. Any ideas on what to look at first?

 

[Tony Huntb]

This is the remote I have.

 

[LostKiwi]

Won't crank or won't start?

 

[Tony Huntb]

Wont crank

 

[LostKiwi]

Sounds like the immobilizer has decided to operate. Not something I'm well versed in and not something normally discussed in forum.
Does yours have the mirror with the green and red LEDs?

In my notes:
In approximately 1991, the ATA system added the K38 relay which controlled starter motor operation. In approximately 1993, this function was added to the RCL control module, introducing the immobilizer system which added additional RCL control functions: interruption of ignition, fuel, starter or vacuum. The important difference is that the RCL control module communicates on a CAN bus to other control modules.
NOTE:
If the vehicle is unlocked with the mechanical key, the ignition switch may not operate to start the vehicle. The vehicle may need to be unlocked using the remote key to unlock the immobilizer, which then permits the engine to start.

 

[Tony Huntb]

Yes the car has the red and green LED’s. Swapped out the batteries and still no joy.