Fuse allocation W168 A160 petrol 2002.

As owners of modern cars we tend to take for granted the services fitted and the sophistication of the integrated sensors ,detectors and components fitted I received this e-mail which may emphasis the importance of the fuses and relays fitted to these vehicles.

I received this mail from an owner of an A140 which I feel sure other owners will want to make note, certainly it could save you a lot of money if you can recall the details when and if you need it?

Quote
I would like to relate a story about my wife's A140 classic auto 2001, it might be of some interest / use to your readers if you wish to pass it on.
I couple of weeks ago I was switching our cars around on the drive, and when I turned the A140 engine off I could hear an electric motor running under the bonnet.
Thinking "cooling fan" I listened for several minutes, but it did not switch off. Looking under the bonnet the motor concerned was a fan beside the power steering reservoir and the washer reservoir. In the time it had been running it was already too hot to touch! I pulled the electrical connector out to stop it frying, and called Mobilo-life thinking the diagnosis would be "failed control relay"
However, Mobilo-life diagnostics showed many flagged faults including the dreaded mass airflow sensor / ECU failure.
I had the car recovered to my local MB workshop with a heavy heart, and a faulty relay was replaced - re-diagnosis showed no faults (I got a printout!)
I believe the fan is an auxiliary air pump; on for a short time on start up to blow additional air into the catalyst to speed it warming up. I also think (although I did not check position myself) the relay is one of the hidden ones behind the panel in the engine bay (K6; air pump)
Probably, relay failure is a fairly rare occurrence, but this one could cost a new air pump, flat battery, and possibly new or refurbished mass flow sensor if you took the first diagnosis as gospel. I just goes to show how modern car engine management electronics are effected by faults in many and varied systems. Keep up the good work on the web site Regards Raymond Mayes unquote.
These details are certainly worth noting in your memory banks, many thanks Ray for the information.
lofty



Please be aware that the fuses fitted will vary for different models of 'A' Class W168 & W169. this is due to the type of equipment fitted on the vehicle.
The information contained on this document has been copied from, Information page for Fuses & Relays Mercedes-Benz. A168 004 03 99.
This document can normally be found in the slot at the front of the main fuse display.

Fuses Main Board.
1	20 amp	Diagnostic socket + Cruise control gasoline. Gasoline engine control module. Secondary air injection relay. Secondary air injection valve. Shut off valve. Fan relay.
1#.	# = 10amp (diesel)	Diesel control module # Wastegate actuator #. Throttle switch over valve #. Pressure control valve, Exhaust gas recalculation # CAT. temperature sensor #.
2	25 amp	Engine control module gasoline/diesel. Fuel pump relay(coil).Ignition coils. Injection valves. electronic accelerator.
3	30 amp 40amp	Engine cooling fan. Engine cooling fan with HVAC.
4	7.5 amp	Engine control module gasoline.
5	40 amp	Automatic clutch.
6	30 amp	Fuel pump relay.
7	40 amp	Light module
8	30 amp	Starter relay.
9	40 amp 30 amp	Wiper motor. Rain Sensor.
10	40 amp 20 amp	Louver sun roof. Rear window wiper.
11	15 amp	Steering wheel combination switch. Wiper control. Head lamp flasher. windshield washer pumps . RNS(radio navigation system.)
12	30 amp	Cigar lighter. Trunk plug socket. Radio. Glove compartment light. CD changer.
13	30 amp 7.5 amp	Power window front 2 x (or power window 4 x )
14	15 amp	Instrument cluster, Timer, Wiper/Washer pump relay. Switch group COC (Mobile phone)
15	10amp	Air bag control module. Sensor. Automatic Child seat recognition.
16	15 amp	Outside mirror adjustment/heated mirrors. Switch group COC. Parktronic
17	15 amp	Horn/fan-fair.
18	10 amp	Instrument cluster transponder & RFL.
19	25 amp 15 amp 15 amp 5 amp	Trailer towing device or taxi
20	5 amp 15amp 7.5 amp	trailer towing device or taxi
21	15 amp	trailer towing device or taxi
22	25 amp 7.5 amp	Sound system
23	7.5 amp 30 amp	Make up mirror (interior)
24	10 amp	Control Module Airbag (Window bag)
25	15amp	12 volt socket in centre consul. Switch, rear dome lamp
26	Blank	Blank
27	Blank	Blank
28	10 amp	Instrument cluster, load . Power windows, 4 x Control module
29	15 amp	Central locking . Seat mounting recognition device.
30	7.5 amp	DAS transponder.& RFL. Electric Instrument Cluster
31	25 amp	Rear window defroster
32	15 amp	Mobile phone compensator, Radio or RNS Radio Navigation System, CD Changer, Dome lamps , Front & Rear door lamp
33	30 amp	Front power window, 4 x Lhs Rhs
34	Blank	Blank
35	10 amp	(Anti- theft Control module) " x relay, light & Horn
36	10 amp	Front heated seats.
37	10 amp	Program selector VCS. Heated Washer nozzles. Heated washer hose.
38	10 amp	Ac control module( compressor) temperature sensor inside air. Humidity sensor. power electronics PTC. Control unit heater gasoline. Anti-dazzle interior mirror.
39	7.5	Light module, reversing lamp, MT /auto clutch. Reverse lamp VGS
40	10 amp	Stop light Lhs, Rhs, and centre rear brake signal. ESP and steering angle sensor.
41	10 amp	AC control module. Diagnostic socket.
42	30 amp	Rear power window , (4 x Lhs Rhs)
43	15 amp	ESP. Brake switch NC contact.
44	10 amp	VGS* control module or automatic clutch.
45	30 amp	Control unit heater or AC control module.
46	80 amp	Central securing system.
47	60 amp	Power steering pump.
48	60 amp 30 amp	Pre glow control module Diesel. or air injection
49	200 amp	Alternator fuse Diesel PTC
Lighting fuse board
1	7.5 amp	Low beam left.
2	7.5 amp	Low beam right.
3	15 amp	High beam . High beam indicator lamp.
4	7.5 amp	Parking lamp left/tail lamp, left.
5	15 amp	Parking lamp. right/tail lamp right. licence plate illumination. Instrument cluster terminal 58
6	15 amp	Front & rear fog lamps left
Relays
K1	MB No 000 542 03 19	Washer pump
K20	002 542 11 19	Horn
K21	008 545 14 26	Swichable rear dome lamp
K3	(0002 542 76 19 (New part Number)	Starter lockout relay
K4	002 542 13 19	Cooling fan.
K5	002 542 13 19	ESP feed pump.
K6	002 542 13 19	Air pump
K7	002 542 13 19	Fuel pump
K8	002 542 25 19	Engine management.
K9	002 542 25 19	ESP/VGS or ESP/automatic clutch.
K10	002 542 13 19	rear window defroster.