Fuses and relays Mercedes A-Class (W169; 2004 - 2012)

The second generation Mercedes-Benz A-Class was introduced in 2004. The body of the car was assembled from high-strength steel alloys with special adhesive joints, inheriting the "sandwich" architecture from its predecessor. In 2008, the car underwent a facelift. In this material, we will analyze in detail the Mercedes fuse circuits in the back of the W169 2nd generation A-class (A150, A160, A170) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 release.

general view of the car
The diagrams of the 2nd generation Mercedes A-class (W169 body: A150, A160, A170)  2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 year release are considered.

In the passenger compartment

The location of the fuse box in the passenger compartment
The main fuse block is located in the front passenger's footwell. To access it, you must remove the floor cladding.


General form.

Diagram
No. A Description
1 10 Before 2008 restyling:  Brake light switch
5 code U58 (exterior lighting):  Brake light switch
2 25 Heated rear window
3 7.5 Instrument cluster
EZS module
4 15
Electronic steering lock control unit
5 7.5 HAU panel module
Panel module KLA (automatic climate control)
6 15 Right horn
Left horn
7 25 Fuel module with fuel level sensor (fuel pump fuse)
8 25 Ceiling module-control panel
9 40 ESP and BAS system module
10 40 Fan motor
11 30 Engine 266:  Relay el. terminal 87 circuits, motor
40 Engine 640:  Relay el. terminal 87 circuits, motor
12 5 steering column module
Multifunction steering wheel
13 25 Front left door module
14 25 Front Right Door Module
15 25 ESP and BAS system module
16 10 Diagnostic connector
PTS module (parking sensors, dorestyling)
17 5 Rotary switch for outdoor lighting
18 7.5 KP 711, 716:  Reversing signal switch
19 5 Micromechanical yaw rate sensor AY
20 7.5 Passive safety system control module
21 30 Starter
22 7.5 Instrument cluster
23 20 Engine 640 (from 1.9.08):  Fuel filter condensate sensor with heating element
7.5 Before 2008 restyling:  Heated washer nozzles
24 7.5 Power steering (ES) module
25 7.5 Brake light switch
ESP and BAS systems
26 7.5 KP 722:  electronic selector lever module
27 10 KP 722:  CVT (continuously variable automatic transmission)
28 5 Rotary switch for outdoor lighting
29 30 SAM module
30 25 Relay el. circuit terminal 87F
31 5 Rotary switch for outdoor lighting
Central interface module (vehicles up to 30.11.05)
32 7.5 Engine 266:  Module ME
33 15 Audio system
Audio module and navigation box
Control and display unit COMAND
34 25 Rear left door
35 25 Rear right door
36 10 After restyling 2008: PTS module (parking sensors)
Trailer
7.5 Before 2008 restyling:  Trailer
Electrical connector mobile phone chain
37 7.5 SRS system
Front passenger seat passenger / child seat recognition sensor
Front passenger seat occupied recognition system
38 25 Front cigarette lighter fuse with illumination
39 25 Wiper motor
40 25 Sectional roof:  Overhead control panel (sunroof motor)
7.5 Overhead control panel
41 15 tailgate wiper motor
42 7.5 Glove compartment lighting with microswitch 
Vanity mirror lighting left and right
Pedal depression control sensor (package for driving school)
Footwell light switch (driving school bag)
Pluggable connection VICS + ETC power supply (Japan)
Emergency call system control unit (USA)
43 7.5 Engine 266:  handpiece electr. circuit terminal 87M1e
15 Engine 640:  handpiece electr. circuit terminal 87M1e
Dual-fuel gas-petrol Engine:  electric tip. circuit terminal 87M1e
44 15 Engine 266:  handpiece electr. circuit terminal 87M2e
20 Engine 640:  handpiece electr. circuit terminal 87M2e
45 25 Engine 640:  CDI system
46 25 Woofer (Japan, restyled 2008)
40 Speaker amplifier (after restyling 2008)
7.5 UHI (Universal Mobile Phone Interface) module (before restyling)
GSM 1800 network compensator (before restyling)
Phone (Japan, before restyling)
47 7.5 Electrical connector mobile phone chain
UHI Module (Universal Mobile Phone Interface)
Voice control system module (dorestyling)
Phone module (Japan, do-styling)
48 7.5 EDW / Towing Protection / Interior Protection System
Alarm siren
49 25 Upper control panel
pre-styling : heated cushion and backrest of the front left and right seats
50 7.5 multimedia interface (restyling)
Digital TV tuner (restyling)
Digital sound broadcasting system unit (restyling)
CD changer (dorestyling)
Pluggable connection VICS + ETC power supply (Japan, do-styling)
30 Service vehicles:  Roof beam
tip electr. terminal 30 circuits
51 10 Passenger Weight System (WSS) Module (Canada)
Control panel for special signaling system (service vehicles)
52 7.5 Emergency call system (vehicles up to 31.5.06)
5 VICS + ETC power supply connector (Japan, vehicles up to 31.5.06)
53 30 Interior socket 12V
Rear cigarette lighter fuse Mercedes A150, A160, A170 with illumination
54 15 Service vehicles :  2-pin 12V socket
25 pre-styling : Speaker amplifier / Woofer
55 7.5 Dorestyling and restyling with code 614: Front left and right headlight
10 Restyling:  Front left headlight
56 10 Restyling:  Front right headlight
57 15 restyling: AHV towing hitch plug, 13-pin
20 Audio interface control unit (Japan pre-styling)
7.5 Emergency call system control unit
SDAR module
58 25 Trailer module
59 20 AHV trailer coupling, 13-pin
Trailer control module (vehicles up to 31.5.05)
60 20 Driver's seat contact strip
61 20 Front passenger seat contact strip
62 40 Restyling:  Relay el. terminal 15 (2) circuits (accessories: xenon headlights, mobile phone)
25 Dorestyling:  Relay el. terminal 15 (2) circuits (accessories: xenon headlights, mobile phone)
63 7.5 SDAR module (Canada)
25 Roof beam (company cars)
64 40 Engine 266:  Air Pump Relay
80 Engine 640:  End of glow plug time
65 80 Power steering module (ES)
66 60 SAM module
67 50 Relay el. terminal 15R (2) circuits (accessory)
68 50 Standard equipment (restyling):  Suction electric fan of the engine and air conditioner with integrated regulator ( Dorestyling:  (valid for engines 266.920 and 266.940 with gearbox 722))
60 Special equipment (restyling): Dorestyling:  (valid for engines 640.940, 640.941, 266.960, 266.980 and for engines 266.920, 266.940 with code (550): Trailer coupling)) 
69 50 Relay el. terminal 15R circuits (1)
70 60 Relay el. terminal 15 circuits (1)
71 150 Engine 640 :   PTC heater
72 60 Dorestyling :  electric tip terminal 30 circuits
Service vehicles :
   Fuse 7 (F7f7)
   Fuse 10 (F7f10)
Taxi :
   Multifunctional unit (MSS) 

The location of the relay box in the passenger compartment
An additional mounting block with relay modules is located behind the passenger side trim (K100).

For access:


1. Remove the lining under the glove compartment.


2. Dismantle the panel near the door.


3. Move the floor sheathing to the side.

K100 block diagram
No. Relay description
A Relay, circuit 15R (2) (SA)
B Circuit 15R relay (1)
C Horn
D heated rear window
E 1/2 wiper speed
F on / off wiper
G circuit 15 (1)
H Reserve
I Air pump
K Fuel module (fuel pump relay)
L Engine circuit 87 relay
M Starter
N Chain 87F
O Circuit 15 (2) (SA: xenon, cell phone)
No. Appointment A
80 Taxi 30
81 30
82 30
83 30
General layout of all Mercedes W169 electrical equipment
No. Component
1 ABS module
2 Air conditioner control unit - in the heater control panel
3 Antenna signal amplifiers
4
5 Left shock sensor
6 Right shock sensor
7 Anti-theft control module
8 Vehicle tilt sensor (anti-theft system)
9 Anti-theft system horn - on the resonator of the intake system
10 Volume change sensors (anti-theft system)
11 Audio system
12 Additional heater
13 Battery
14 CAN data bus, gateway control unit
15 Central locking signal sensor (infrared) - in the driver's door handle
16 Diagnostic connector (DLC)
17 Left front door module
18 Left rear door module
19 Right front door module
20 Right rear door module
21 Dashboard relay box
22 Fuse box, footwell
23 Klaxon - behind the front bumper
24 Ignition switch control module
25 Immobilizer - (combined with the ignition switch control unit)
26 immobilizer antenna
27 Turn signal / alarm relay - in multifunction control box
28 Lighting unit
29 Multifunction control module - connected to the footwell fuse / relay box -functions: Interior lights, exterior lights, horns, windshield wipers, central locking, power windows, direction indicators, anti-theft system, sunroof, seat heaters, immobilizer
30 Multifunction steering wheel controls
31 Multi-function switch control unit
32 Navigation module
33 Outdoor air temperature sensor
34 Parktronic module
35 Power steering control unit
36 Rain sensor - inside rearview mirror
37 Seat heating module
38 Seat occupant sensor
39 Steering column electronics control unit
40 SRS system
41 Telephone connection module
42 Phone interface
43 Trailer electrical equipment
44 Gearbox module - in the gearbox
45 Relay for intermittent operation of the windshield wiper
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