All values measured to ground unless otherwise noted
Conn./Plug/Pin Pin Information Test Value Comments
A35/8      
1.9 Roadside assist LED illumination output 5 - 12 VDC  
1.10 Roadside assist call switched ground input 2.5 VDC inactive mode, < 1 VDC active mode  
1.11 Tele Aid switch signal input 2.5 VDC inactive mode, < 1 VDC active mode  
1.12 Tele Aid switch function illumination output 12 VDC intermittent with E-Call triggered  
1.13 Crash signal input Do not test  
1.14,15 Main ground to W7 Approx. 0 Ohms to ground  
1.18 Info call LED illumination output 5 - 12 VDC  
1.19 Circuit 15R power input 12 VDC with key in position "1" Feed from F1f6
 
1.20
1.21		 Hands free microphone signal input
low side and shield
high side		 No reliable test , check with test microphone  
Note 1
1.22,23 Circuit 30 main power input 12 VDC at all times Feed from F4f8
1.25 "Diagnostic port" for DTC readout and diagnostic purpose No reliable test  
1.26 Mute signal output Radio or COMAND switches to mute when
Tele Aid activated		  
1.1-8,16,
17,24		 Pins not used    
       
2.3 Info call switched ground input 2.5 VDC inactive mode, < 1 VDC active mode  
 
2.14
2.21		 HFS speakers signal output
low side
high side		 Check for AC voltage (approx. 1VAC) with a
touch-tone button pressed
Disconnect plug,
measure < 10 Ohms across pins 2.14-2.21		  
 
2.23
2.24		 Microphone signal output to CTEL ECM
high side
low side and shield		 No reliable test  

Note 1
2.4,5,12,
15,17-19,
22,25,26		 Pins not used    
A1 CTEL antenna input and output connector Radio frequency  
A2 Backup E-Call antenna input and output connector Radio frequency  
A3 GPS antenna input connector Radio frequency  
A4 CTEL antenna input and output connector to CTEL ECM Radio frequency  
Note 1 Shield connection prevents from interference which might cause signal distortion    
Note 2 Pins 2.1,6-11,13,16,20 only carry system interchanging signals. No reliable test, check continuity of wiring