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7/30/2019 CAMBIO LUCES CUADRO - Mercedes-Benz 'a'-Class Information.instrument Cluster Designation, 2001 Models

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Component Parts & AssemblyInstrument cluster bulbs & replacement.

Face lift model W168 from the 1/3/2001

Before you consider pulling your dash apart because you haven't got the various lightsdisplayed here, be aware the pre-face lift and face-lift models as with the W169 A

Class will have different light displays.

It is also worth noting, :- One owner recently contacted me because only two off the

lights on his instrument cluster illuminated when he turned on the ignition, althoughthe car still started and ran OK.

He took the car to a non MB garage who couldn't help and so booked it into an MBgarage for a diagnostics test.

In the meanwhile I gave him some pointers hoping this would help him with the

problem. While he was waiting for my replies he decided to disconnect the battery

which has been known to cure a number of problems on owners cars in the past (thereis only a need to disconnect the negative terminal.)

When he reconnected the battery some minutes later every thing lit up as normal and he was to say the least a happy owner.

He was also able to cancel the appointment with MB workshops which would haveset him back £50.00 at the very least. So please remember it is worth while

disconnecting you battery if you have an electrical glitch like this.

I would disconnect and leave the battery disconnected for several minutes.When you do reconnect put your lights On, before connecting the battery, thereby

reducing the serge of power to the ECU, and remember to re-set your windows and

ESP/ABS by turning the steering wheel fully left then fully right, this is best donewhile the car is slowly moving, the warning light will go out. Repeat the procedure if

necessary.



Back to differences in the models, there is for instance no engine management light on

the display when switching on the ignition on a pre-face lift a class. also the SRS lightonly stays on for seconds so make sure you look for it if checking.

Also before we can even consider replacing bulbs in the dash display we have to

consider what year 'A' Class we are driving.Gaining access to the bulbs in the instrument cluster display can vary considerably

from pre-face to face lift A168 from the 1/3/2001

Also if you are removing the display because the display in dimly lit then DO

REMEMBER that the display lighting can be adjusted by using the + (plus or -

Minus buttons on the right had side of the display. Check this feature before going

further, it may solve your problems.Also remember the bulbs light for different features on the car : In position 2 before

the engine is started most will be illuminated others will only light when the vehicle

lighting is on.For Pre Face-Lift 28/02/2001 see link bottom of page.

When looking at the dash one

of two displays will confront

you, look at the facia mouldingsA if it is continuous from one

side of the car to the other thenwe are dealing with a face lift

model. If that same moulding is

split just to the left of thesteering wheel, on right hand

drive cars we are dealing with

pre face lift



* The cowling that covers the instrument cluster behind

the steering wheel is reasonably easy to remove, althoughtwo tools are required, I made these up from and old

pegboard display hooks and they worked well. Obviously better than the proper MB tools as one of the securing

clips had already been broken and the car has only ever

been serviced by Mercedes-Benz.(MB)

*2 These two photo's show the

dome the right way up as whenfitted. As you look at the arch

of the cowling, although it is

impossible to see them thereare two slots about 1/8" deep.

* Slide the two hooked tools

with the tip pointing towards the outside edge of the dome in each case. as shown in photo 4.

*4 Please Note in these two

photo's the cowl (Dome) is

shown upside down. Turn thetools bringing the tip of the

tool into contact with the

securing clip, to release theclip apply slight pressure thus

lifting the clip, and pull the cowling towards the steering wheel.

*Sprung clip 3 If it does not release apply slightly more pressure when turning thetools, too much pressure may damage the clips.

* I found using an assistant allowed me to apply pressure and for the assistant togently pull on the cowling.

* the cowling can be completely removed, this now exposes the instument cluster which can also be removed if required, after removing the securing screw (if fitted)

* If using MB tools then pull the tools towards you to release the cowling.



*5 When replacing the instrument cluster

ensure it is correctly situated and re-secured as

found.

When replacing the contact ribbon (Multi pin plug), ensure it is firmly housed,

when replacing the Cowling ensure you engagethe three toes into the slots provided,

* Slide the cowling back into position and press firmly, the two clips will be heard to re-

engage holding the cowling firmly in position.

Havingremoved the

cowling, the

instrumentcluster becomes

visible. *1 Shows the bulb

positions 8 x

12v 1.2wattalthough there

are only 5 shown.

The location of these is such that it is almost impossible to remove them without usingsome form of tool. I found that a piece of 10mm bore polythene tube pushed onto the

bulb holder allowed me to turn and remove the bulbs without any problem, and without disturbing the Instrument cluster further.

I have not had the need to purchase bulbs

and so am unsure of cost or MB partnumber.However it should be stocked by most car

accessory shops 12volt 1.2 watt dash bulb.



The bulb will not come with the black holder, pull the glass bulb

from the holder and replace with

the New bulb.

Halfords Stock the 12V 1.2 W bulb their number stock 286.

Price £1.79 each.Bosch also do a bulb complete

with holder their stock number 509T Note (Some bulbs are not

removable from holder) ALL 'A'

Class dash bulbs remove. * 2 Temperature sensor.I have no information on this item, it is the probe of the temperature sensor.

*3 Multi pin connectors to the instrument cluster. Beforeattempting to release either of the multi- pin connectors

from the instrument cluster module, the battery MUST be

disconnected.(see page 35 for procedures on re-settingwindows and ESP/ABS)

This is because removing them trips the anti tamper circuit which causes the alarm to sound

To release the connector from the

instrument cluster module press

the small black pip 3 in towardsthe connector, then slide the

clamp round & away from the

multi plug.

To remove the multi plugs from

the module I suspect that the

instrument cluster module willneed to be released from the dash as there is insufficient room to pull & remove the

plugs



Should there be a need to remove the complete instrument cluster, the multi pinconnectors need to be removed as well as the temperature sensor probe being moved

out of the way.

When Savcic , a

fellow owner had problems he was

told by MB that he

needed a new

instrument cluster ,he knew he had

some bulbs gone ( bulb locations

indicated by A Which are removed

from the rear withthe instrumentcluster fully

assembled) and so

removed the cluster , cleaned the

terminals and replaced the



defective bulbs, his original problem still exists but this does not affect the running of

the car.

He was also told that he needed a new foil in the passenger seat as his SRS light

remained on, he replaced this and deleted the problem, so diagnostic tests aren't

always right and repairs can be carried out although it appears that MB fitters justreplace the part irrespective of cost!

However stripping components to this degree unless faulty should be avoided , as can

be seen the unit is made up of hundreds of micro components and damage can becaused just by the removal of the cover so take great care, Savcic had nothing to loose

as he was told it need replacing before he started. As the problems of the various

lights flashing when he turns off the ignition does not affect the running of the car hecan do this as and when finances allow.

The cluster is held in with one

screw b and two black clips a

The screw that secures the cluster is not installed on my car,

although there is provision for it.

NOTE A number of these photographs were taken through

the windscreen, before replacing

the cowling check to ensure allcomponents have been replaced in their rightful place.

Re-assemble in reverse order.

Pre Face Lift 28/02/2001 Removing/installing Bulbs Instrument cluster

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