Retrofit wiring harness - AN82.61-P-0001-01VB

Disconnect on-board, brown line (br) from ground (center console) (W12).
The ground point is located below the radio recess.
Insulate brown line (br) and strap down at the on-board wiring harness (7).
Brown line (br) is no longer required.

Fig 1: Insulating Brown Line And Strap Down At On-Board Wiring Harness
Courtesy of MERCEDES-BENZ USA

Fig 2: Separating Black, 44-Pin Radio Connector From On-Board Wiring Harness
Courtesy of MERCEDES-BENZ USA

3.1 If available, remove black 2-pin connector with fiber optical cables from black, 44-pin radio connector (8).
4 Put on-board wiring harness (7) with black, 44-pin radio connector (8) into right footwell.
5 Separate black, 44-pin radio connector (8) from on-board wiring harness (7) using side cutting pliers.
Antenna line must not be cut. Black radio connector (8) is no longer required.
6 Set branch-off line (9) of vehicle's on-board wiring harness (7) to one side for further processing.
Branch-off line (9) has a brown (br) and a red/blue line (rt/bl) with a line cross section of 1.5 mm² each.
7 Insulate brown line (br) and strap down at branch-off line (9).
Brown line (br) is no longer required.
8 Set branch-off line (10) of vehicle's on-board wiring harness (7) to one side for further processing.
Branch-off line (10) has a pink and blue/white line with a line cross section of 0.75 mm² .

A yellow, a brown, and a brown/red line with a line cross section of 0.5 mmm² .
9 Connect red/blue line (rt/bl) of new radio voltage supply wiring harness (6) with the aid of a solder connector (12) to the red/blue line (rt/bl) of the branch-off line (9).
10 Connect pink line (rs) of new radio voltage supply wiring harness (6) with a voltage distributor (11) to the pink line (rs) of the branch-off line (10) in order to make it possible to attach another voltage distributor (11) later on.
The yellow (ge), brown (br), blue/white (bl/ws), and brown/red (br/rt) lines will be connected at a later point in time.

Fig 3: Connecting Red/Blue Line Of New Radio Voltage Supply Wiring Harness To Red/Blue Line Of Branch-Off Line
Courtesy of MERCEDES-BENZ USA
11 Route black, 6-pin connector for radio and navigation unit (A2/56) of radio voltage supply wiring harness (6) into the radio recess.
On vehicles with code (423) 5-speed automatic transmission (NAT) or with code (427) 7-speed automatic transmission, the radio voltage supply wiring harness (6) has to be routed below the startlocking cable (13).
12 Connect brown line (br) of radio voltage supply wiring harness (6) to ground (center console) (W12).
Black, 6-pin connector of radio voltage supply wiring harness (6) will be connected and fixed into position at the radio and navigation unit (A2/56) at a later point in time.

Fig 4: Connecting Brown Line Of Radio Voltage Supply Wiring Harness To Ground (Center Console) (W12)
Courtesy of MERCEDES-BENZ USA