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A18 Amplifier
Plug connector overview
Number X-pin, colour Description 
X605 12-pin, black Plug connector A Amplifier 
X606 26-pin, black Plug connector B Amplifier 
Pin assignments at plug connector X605
Pin Type Description / Signal type Connection /
Measuring notes 
1 E Terminal 30 Plug connector I 
      
2 E Radio ON/antenna signal Antenna amplifier 
      
3 M Amplifier ground Ground connector 
      
4   Not used   
      
5 A Positive activation, rear right woofer Right rear speaker 
      
6 A Negative activation, rear right woofer Right rear speaker 
      
7 A Positive activation, front left woofer Left front speaker 
      
8 A Negative activation, front left woofer Left front speaker 
      
9 A Positive activation, front right woofer Right front speaker 
      
10 A Negative activation, front right woofer Right front speaker 
      
11 A Positive activation, rear left woofer Left rear speaker 
      
12 A Negative activation, rear left woofer Left rear speaker 
      
Pin assignments at plug connector X606
Pin Type Description / Signal type Connection /
Measuring notes 
1 E Negative activation, rear right loudspeaker Radio 
      
2 E Positive activation, rear right loudspeaker Radio 
      
3 E Positive activation, rear left loudspeaker Radio 
      
4 E Negative activation, rear left loudspeaker Radio 
      
5   Not used   
      
6   Not used   
      
7   Not used   
      
8 A Positive activation, front right medium-range speaker Right front speaker 
      
9 A Negative activation, front right medium-range speaker Right front speaker 
      
10 A Positive activation, rear left tweeter Left rear speaker 
      
11 A Negative activation, rear left tweeter Left rear speaker 
      
12 A Positive activation, rear right tweeter Right rear speaker 
      
13 A Negative activation, rear right tweeter Right rear speaker 
      
14 E Negative activation, front right loudspeaker Radio 
      
15 E Positive activation, front right loudspeaker Radio 
      
16 E Positive activation, front left loudspeaker Radio 
      
17 E Negative activation, front left loudspeaker Radio 
      
18   Not used   
      
19   Not used   
      
20   Not used   
      
21 A Positive activation, front left tweeter Left front speaker 
      
22 A Negative activation, front left tweeter Left front speaker 
      
23 A Positive activation, front right tweeter Right front speaker 
      
24 A Negative activation, front right tweeter Right front speaker 
      
25 A Positive activation, front left mid-range speaker Left front speaker 
      
26 A Negative activation, front left mid-range speaker Left front speaker 
 
 
 
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A18 Amplifier
Plug connector overview
Number X-pin, colour Description 
X18771 15-pin, black Plug connector A Amplifier 
X18772 18-pin, black Plug connector B Amplifier 
X18773 26-pin, black Plug connector C Amplifier 
Pin assignments at plug connector X18771
Pin Type Description / Signal type Connection /
Measuring notes 
1 A Positive signal, subwoofer speaker 1 Subwoofer speaker 
      
2 A Positive signal, subwoofer speaker 2 Subwoofer speaker 
      
3 A Positive activation, rear left woofer Left rear speaker 
      
4 A Antenna signal Connector, antenna amplifier 
      
5 E Negative activation, rear right woofer Right rear speaker 
      
6 E Negative signal, subwoofer speaker 4 Subwoofer speaker 
      
7 E Negative signal, subwoofer speaker 3 Subwoofer speaker 
      
8 E Terminal 30 Fuse F69 
      
9 E Negative signal, subwoofer speaker 1 Subwoofer speaker 
      
10 E Negative signal, subwoofer speaker 2 Subwoofer speaker 
      
11 E Negative activation, rear left woofer Left rear speaker 
      
12 A Positive activation, rear right woofer Right rear speaker 
      
13 A Positive signal, subwoofer speaker 4 Subwoofer speaker 
      
14 A Positive signal, subwoofer speaker 3 Subwoofer speaker 
      
15 M Ground Ground point 
      
Pin assignments at plug connector X18772
Pin Type Description / Signal type Connection /
Measuring notes 
1   Not used   
      
2 E Negative signal, low frequency Transceiver/charging electronics 
      
3   Not used   
      
4   Not used   
      
5 E/A I-bus signal line I-bus connector 
      
6   Not used   
      
7   Not used   
      
8 E Negative activation, front right loudspeaker Radio 
      
9 E Negative activation, front left loudspeaker Radio 
      
10   Not used   
      
11 A Positive signal, low frequency Transceiver/charging electronics 
      
12   Not used   
      
13 E Telephone mute signal Transceiver/charging electronics 
      
14   Not used   
      
15 E Signal line, night lights Eject box 
      
16   Not used   
      
17   Positive activation, front right loudspeaker Radio 
      
18 E Positive activation, front left loudspeaker Radio 
      
Pin assignments at plug connector X18773
Pin Type Description / Signal type Connection /
Measuring notes 
1 A Positive activation, front left woofer Left front speaker 
      
2 A Negative activation, front left woofer Left front speaker 
      
3   Not used   
      
4 A Negative activation, front right medium-range speaker Right front speaker 
      
5 A Positive activation, front left mid-range speaker Left front speaker 
      
6   Not used   
      
7   Not used   
      
8   Not used   
      
9 A Positive activation, front right medium-range speaker Right front speaker 
      
10 A Negative activation, front left mid-range speaker Left front speaker 
      
11 A Positive activation, rear right tweeter Right rear speaker 
      
12 A Positive activation, front right tweeter Right front speaker 
      
13 A Positive activation, front right woofer Right front speaker 
      
14 A Positive activation, front left tweeter Left front speaker 
      
15 A Negative activation, front left tweeter Left front speaker 
      
16 A Negative activation, rear left tweeter Left rear speaker 
      
17   Not used   
      
18   Not used   
      
19 A Positive activation, rear left tweeter Left rear speaker 
      
20   Not used   
      
21   Not used   
      
22   Not used   
      
23   Not used   
      
24 A Negative activation, rear right tweeter Right rear speaker 
      
25 A Negative activation, front right tweeter Right front speaker 
      
26 A Negative activation, front right woofer Right front speaker 
 
