A2/12 - Antenna amplifier at the top of the rear window; A8/1 - Remote control; A26/1 - IR receiver left front door; A26/2 - IR receiver front right door; A37 - Pneumatic Suspension Equipment (PSE) Combined Control Unit; N10/8 - Rear SAM; N69/1 - Left front door control unit; N69/2 - Right front door control unit; N70 - Overhead console control unit; N72/1 - Upper console control unit; N72/1s6 - Salon single lock; N73 - Electronic ignition switch control unit; S86/1 - Left front door lock switch (option) (USA); S87/1 - Left front door lock switch (option) (japan models with right hand drive); S88/2 - Trunk lid lock switch (option) (USA) (Japan)
Scheme of functioning of a single lock
A2/12 - Rear window antenna amplifier unit; A8/1 - Key transmitter; A26/1 - Left Front IR Receiver; A26/2 - Right Front IR Receiver; A37 - Pneumatic System Equipment (PSE) Control Unit (combination function); CAN - CAN; E1e5 - Left front turn signal; E2e5 - Right front turn signal; E3e1 - Left rear turn signal; E4e1 - Right rear direction indicator; E6/5 - Direction indicator on left outside mirror; E6/6 - Direction indicator on right outside mirror; N10/8 - Rear SAM; N69/1 - Left front door control unit; N69/2 - Right front door control unit; N70 - Overhead console control unit; N73 - EIS control unit; N80 - Steering column unit; P1 - Pneumatic actuator, driver's door; P2 - Pneumatic actuator, front passenger door; P3 - Pneumatic actuator, left rear door; P4 - Pneumatic actuator, right rear door; P6 - Pneumatic actuator, luggage compartment lid; S - Activation of direction indicators via the corresponding control units
Please refer to the accompanying illustrations.
There are two modes of unlocking the car: "Full unlocking" and "Individual unlocking". In the "Full unlocking" mode, all doors, the trunk lid and the fuel filler door are unlocked. In the "Individual unlocking" mode, only the driver's door and the fuel filler flap are unlocked. In both modes, the ATA anti-theft alarm is deactivated.
The management of a single lock is described in detail in Chapter User manual.
(Original source of information MercedesMan)