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Discussion Starter #1
I have a 98 Chrysler Concorde LXi 3.2 engine and lately it has developed computer module problems.

Initial problems started by dashboard lights, side marker lights and tail lights, suddenly going out.

I did have a front's turn signal light which occasionally water would get into the switch and corrosion occurred. The bulb and socket was burned extremely badly and probably cause the system Body Control Module BCM to be affected.

I replaced the corroded switch and put a new lamp in.

The body control module BCM now seems to be working correctly when the engine is running all lights working.

Unfortunately highbeam will go on, but when I release the steering wheel lever switch will go out. Normally you click back to turn on and click back to turn high beams off. Now as soon as you release the lever they go off again.

Now sometimes when I turn the engine off some of the dashboard lights will come on (various engine indicator lights) , on and fuel gauge comes on and goes off. It almost looks like the BCM is doing diagnostics? It Will Also Sometimes Say "No Bus"

The other major problem I am running into is that the engine sometimes will not shut off with the ignition key out.

This being the most serious problem at the moment.

Anyone have any ideas why the engine would keep running with the ignition key out on the Chrysler Concorde?

Need some help desperately.
 

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Welcome to Allpar. The mechanical high beam detent is inside the multifunction switch. If it has lost its 'click' and latching, then the problem is likely internal to the multifunction switch.
The 'no bus' message will need to be diagnosed and may the reason why the car won't shutdown and your instrument cluster remains active after key-off. The PCI communications bus is a single Yl/Vt wire that moves information (or not) between the various modules. A little wetness, corrosion or electrical leakage at a connector can take the whole bus down. It can be pulled high or low. A DRB III scan tool is easiest for getting fault codes from the BCM, cluster and PCM and running the various diagnostic tests.
If you want to pursue finding the bus fault yourself, you will need to start with a voltmeter, the factory service wiring diagrams and body diagnostic procedures books:
http://www.amazon.com/Chrysler-Concorde-Intrepid-Service-81-270-8140/dp/B001DU7KOA
http://www.amazon.com/Chrysler-Concorde-Intrepid-Diagnostic-Procedures/dp/B002TFZYLY
 

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Discussion Starter #3
I have a 98 Chrysler Concorde LXi 3.2 engine and lately it has developed computer module problems.

Thank you for your reply.
I have tried a new BCM from a junkyard with the same P/N but unfortunately the dashboard lights coming on and off remained the same as before.

For time the engine would not shut down but that seems to have resolved itself.

Checking many of the fuses I noticed that fuse #13 radiator fan is pulled the indicator lights on the dashboard go off.

I can hear a really clicking on the fuse panel on the hood.

It may be that some wires are crossed causing a feedback of voltage?

My normal diagnostic tool does not show any problem outside of when I pull a relay on the Underwood fuse block engine light will come on.

It does not seem to be the BCM but I could be wrong.

Any suggestions?
 

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Discussion Starter #4
98 Chrysler Concorde engine compartment fuse block.

Does anyone know how to replace the fuse block under the hood.

I believe it may have some corrosion inside.

Thanks,
 

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I would do some diagnosis before replacing anything. Your old BCM probably was not the problem and the PDC may not be as well. I suspect wiring and connector corrosion or leakage for the bus communication issue more than a component that has failed.
The clicking relay can be found by feeling which relay is clicking. It could be a poor connection or poor ground or an electrical feedback loop situation which usually comes back to a poor connection and probably not the relay itself.
Your normal diagnostic tool is probably only for engine fault codes and won't help very much with body electrical. You still would be better served by a factory service manual for both diagnosis and procedures.
If you trust this website and can open .rar files, then downloading this service manual may help. 1998-2004 Intrepid, Concorde, 300m and LHS were all similar cars. Otherwise a public library search or service manual purchase may be the best way to start.

CHRYSLER-300M-CONCORDE-AND-INTREPID-2004---Service-Manual.rar
 

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Discussion Starter #6
thank you for the help.

I did order a service manual for the 98 Chrysler Concorde will have to wait till it arrives and see if it helps.

Currently the engine is shutting down when the ignition key is turned off.

Instrument cluster lights and some indicators like: Oil pressure, airbag and other lights stay on.

Then the entire instrument cluster lights and instruments come on for possibly 10 seconds you hear an audible tone and then they go off for maybe 10 seconds.

During this process the odometer doesn't read No Bus which may be the entire problem.

Bus communication can be a real headache.

When I removed the BCM this seemed to be no corrosion on any of the connectors or diffuse block connectors all were in very good shape. The Concorde is in a garage and does not sit outside so I don't think is too much corrosion with the exception of possibly ECM or TCM or possibly power distribution center under the hood are vulnerable to salt corrosion in the Northeast.

I'll have to get some professional tech support but unfortunately dealers cannot be trusted and will take you to the cleaners.

And there are not many hydroelectric specialists in my area if any at all.

That's typically the problem with electrical problems no one really knows much about them.

If you have any other suggestions I would be most grateful to hear from you.

Thank you greatly.
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