All values measured to ground unless otherwise noted
Conn./Plug/Pin Pin Information Test Value Comments
N25/5      
1 Circuit 30 power input 12 VDC at all times  
2 R/F seat cushion and backrest heater element
power output		 Ignition on: 12 VDC with S51/2 in pos. I or II
measure to pin 4 12 VDC in pos. I		  
3-4 Pins not used    
5 Stage I indicator lamp output Ignition on: 12 VDC whether stage I or II selected
Voltage drops to 2.5 VDC when parking light is turned on and idicator lamps become dimmed		 activated from S51/2
6-7 Pins not used    
8 L/F seat cushion and backrest heater element
power output		 Ignition on: 12 VDC with S51/1 in pos. I or II
measure to pin 19 12 VDC in pos. I		  
9 Main ground to W18 Approx. 0 Ohms to ground  
10 Stage II indicator lamp output Ignition on: 12 VDC when stage II selected
Voltage drops to 2.5 VDC when parking light is turned on and idicator lamps become dimmed		 activated from S51/2
11 Right front seat heater element activation signal input Ignition on: 6-8 VDC
press and hold S51/2 in pos. I 2-4 VDC
press and hold S51/2 in pos. II 0-1 VDC		 Resistance:
< 10 Ohms in pos. I
165 Ohms in pos. II
12 Stage I indicator lamp output same as pin 5 activated from S51/1
13 Left front seat heater element activation signal input Ignition on: 6-8 VDC
press and hold S51/1 in pos. I 2-4 VDC
press and hold S51/1 in pos. II 0-1 VDC		 Resistance:
< 10 Ohms in pos. I
165 Ohms in pos. II
14-16 Pins not used    
17 Circuit 15R power input 12 VDC with ignition key in position "1"  
18 Circuit 58d power input 12 VDC with lights on  
19 Pin not used    
20 Stage II indicator lamp output same as pin 10 activated from S51/1
21 Pin not used    
Note HS system will be turned off automatically after approx. 30 min.
Rapid mode is limited to 5 min. operation time		 System is deactivated when battery charging is low, also when too many consumers are switched on at the same time. Indicator lamp will be blinking