My van was running fine, I had the instrument cluster problem but just off and on would quit working and come back. I took it to the shop and had the air conditioner serviced and when they were through they could not get the van to start to get it out of the shop. We replaced the cluster board thinking maybe that was the link, but still won't crank. The dash lights and all the cluster board items come on and the fan will blow, checked battery etc and all ok, the shop wasn't sure they thought the power control module. I can't find this item on a parts list or where it is located on the car. Do you have any ideas?
I was having the same promblem for my 98 dodge grand caravan es...with the no stat promblem...i had the (bcm) replaced in it body control module...but that did not do no good either because it only got it started for a few days...now it's back at the shop and the last resort would be the wireing..because everything else is fine...starter,relays,battery,etc...hope this helps...any more questions email me at email@example.com...thanks..
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At the moment, your instrument cluster maybe faulty? Due the basic tests, try to be sure. Check for applicable trouble codes relating to instrument cluster--pcm--communication codes. Some of the national brand auto stores in this country may check codes for free, if there are any.
Check voltage and ground circuits for the instrument cluster. The sending units for gages are wired to pcm then the pcm sends serial data to instrument cluster telling instrument cluster what to do with gages. If you want to check gage sending units, that's ok.
If you have a scanner that can communicate with instrument cluster, you can get instrument cluster to do a self-test. The self-test, the instrument cluster will turn warning lamps on and off, sweep gages w/o outside data input. The instrument is considered good, if it passes that test, if not, the instrument cluster is considered faulty.
I'd have to check voltage and ground for the instrument cluster. I noticed one of the fuses for your instrument cluster goes hot with the key on, same thing for ac compressor. I'd have to voltage feed to and from ignition switch for applicable fuse. Check the ignition switch wiring connector. I can't rule out ignition switch itself, at the moment.
There could be other issues?
Ignition switch faults are common on some makes and models.
Instrument cluster wiring connector problems. Sometimes if you disconnect and reconnect the instrument cluster connector, it may start working again, also, cycling the instrument cluster connector may reset, if it starts working, well, it's working for now, may quit again.
Some instrument clusters may do a self test, don't know about yours?
Press and hold odometer reset button, turn key to run position release odometer reset button, watch the odometer. Your indicator lamps may turn on and off, the gages may cycle in small increments. The cluster will exit self test on its own.
You may have to check buss circuits.
I recently had the same issue and I have had four - five "expert mechanics" looking into the issue. I took it upon myself to find the correct answer. The problem is NOT the alarm system , the problem is with your instrument cluster. On the back of your instument clusters circuit board there are a number of soldered pins, if you look at them very carefully with a magnifing glass you will notice that one of those soldered connections will have a tiny crack in it. This needs to be resoldered and then you will not have any more problems. It will take you about 45 min.-- to an hour to take it apart (as long as you know how to turn a screwdriver] then take the whole cluster to a Radio or T.V. repair shop and have them resolder the connction. Trust me it worked for me after spending close to a grand with towing and mechanic bills.
First, replace the cam and crank sensors as they are so common and fairly cheap. If that doesn't do it then it could be the main connector on the back of the instrument cluster. There is a printed circuit board that the vehicle electronics comes into and the pins at that connector seem to have a problem with cracked solder joints. Remove the instrument cluster, disassemble it from the PC board and re-solder the connector pins. I've had to do quite a few of these. Next, it could be the fuel pump or fuel pump relay. I'd replace the relay as they are also cheap and may save you a lot of looking.
Have you checked it with a scan tool to be sure it is actually getting the information? The instrument cluster do go out, meaning the ribbon on the back.I would check the connection, then turn to a way to determine if it is recieving a signal from ECM.
no other way to solve it but replace it, sad thing is no second hand clusters available (in Manila). Purchase directly from your Mercedes Benz dealer. This will solve your problem, in a quite costly way.
if you have replaced ther speedometer sending unit then your dash cluster is the problem chances are that the sending unit was only part of the problem. the cluster is static sensitive so have a mechanic replace it for you, if your not familiar with newer dash clusters, static electricity can short not part but the whole dash unit which is quite costly, so be sure to have a shop replace it, if your not up to the task