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C2 connector

16 pin Block A connector

Pin Function
1 RR+
2 FR+
3 FL+
4 RL+
5 RR-
6 FR-
7 FL-
8 RL-
9 CAN B Low
10 Telephone Mute
11 CAN-B High
12 U-Bat- (KL 31)
13 reserved
14 CAN-B shield
15 U-Bat+ (KL 30)
16 Electrical MOST Wake-Up

12 pin Block B connector

1 Microphone 1 In +
2 Microphone 2 In +
3 Microphone Shield
4 Microphone Out+
5 HU CAN low
6 HU Can High
7 Cradke compensator On
8 reserved
9 Microphone Ground
10 Microphone out -
11 reserved
12 reserved

12 pin Block C connector pinout

1 reserved
2 Ext FAN power supply -
3 Aux1 shield
4 Aux1 left
5 reserved
6 reserved
7 Ext FAN diagnosis line
8 Ext FAN power supply +
9 Aux1 ground
10 Aux1 right
11 reserved
12 reserved

Block D pinout

1 Rx-LWL
2 Tx-LWL

12 pin MQS (Japan Only) blue and white Connectors

Pin
Number
Signal
group 3 Code B
white connector
Signal
group 4 Code C
blue connector
1 ETC Rx Serial Tx+
2 ETC Tx Seial Tx-
3 ETC shield Serial Rx-
4 VICS Rx Serial Rx+
5 VICS Tx Voice to Tel (DTR)
6 VICS shield Voice from Tel (DCD)
7 ETC GND CTS
8 ETC ON (12V) RTS
9 reserved GND
10 VICS GND Power (12V)
11 VICS power (+5V) Remote
12 reserved Shield Voice Tel

 

Head unit pinout abbreviations

Pin
Notation
Pin function

Power pins

BAT Battery+  (12V direct from Battery). 
GND, GROUND Chassis Ground
KL.15 Ignition powered. +12 V with the ignition key is in the ACC or ON position.
iLLUM Light-on signal or backlight adjustment. +12V supplied to light-on pin of head unit when tail lights ar turned on.
ANT OUT Power for Electric Antenna. Output +12 V (maximum 150 - 300mA) 

Audio pins

FR+ or RF+ Front right speaker out
FL+ or LF+ Front left speaker out
RR+ Rear right speaker out
LR+ or  RL+ Rear left speaker out
FR- or RF-, FL- or LF-, RR-, LR- or RL-, SGND The corresponding speaker ground

Misc. pins

MUTE This pin is used to silence the audio, earthed by some other external components that is connected to the radio.
GAL This pin is used in some radio equipment to automatically boost up the volume. It needs the output from the speed sensor.
CAN-L, CAN-H CAN on board diagnostic bus
K-Line K-line on board diagnostic bus

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Mercedes-Benz COMAND 2.5 (Typ 220) visual pinout:
Mercedes-Benz COMAND 2.5 (Typ 220) diagram
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