Comfort Heating Function - GF91.30-P-0001KJ

MODEL 453.0 (except 453.091), 453.3 (except 453.391), 453.4 (except 453.491) 

with CODE 873 (Seat heating for driver and front passenger) 

MODEL 453.091/391/491 

with CODE 873 (Seat heating for driver and front passenger) 

except CODE U14 (Climate package) 

Function requirements, general 

• No undervoltage or overvoltage (consumer shutoff not active)
• Circuit 15 ON

The driver seat heater control unit (N25/5) or the front passenger seat heater control unit (N25/4) receives the status of circuit 15 ON and therefore also the power supply via a direct electrical line from the vehicle interior fuse and relay module (F2). To do so, the ignition lock (S2) switches a relay in the vehicle interior fuse and relay module, which connects circuit "15g" to the respective seat heater control unit.

Comfort heating, general information 

The comfort heating function comprises the following subfunctions, which are described in separate documents:

• Seat heater (SIH), function (with code 873 (Seat heater for driver and front passenger))