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Chrysler Repair/chrysler 300: no bus

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Expert: - 7/6/2011


Question
No Bus on the display where the mileage is and vehicle is dead!
some accessories work but most are inop! please help  Tom

Answer
Hi Tom,
The bus is the digital communication system that knits together a half-dozen or so modules that need to share informantion for the proper operation of the electronics involved in the engine/transmission/body computer/cluster/etc/ There are a number of ways that the system could be inactivated.
Can you give me the year of the vehicle and the engine size (L)?
What is the history of the problem?
And did the 'no bus' show up on the odometer spontaneously or was it in response to your request a fault code readout by using the ignition switch?
Can you tell me which accessories work and which don't. I assume there is no starter motor action.
When you turn the key to the 'run' position do you hear the fuel pump hummm for about 1 second from inside the gas tank?
How about the gauges/warning lights on the cluster?
If you haven't tried yet: turn the ignition switch:"on-off-on-off-on and leave on" doing that in 5 seconds or less elapsed time. Then watch the odometer window to see if it shows anything other than 'no bus'.
Roland

Chrysler Repair

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Roland Finston

Expertise

I specialize in Chrysler/Dodge/Plymouth cars, minivans, and SUV's for the model years 1982-2008 based upon my 50-year DIY experience, factory shop manuals and wiring diagrams. I offer fast repair advice to help you minimize repair costs by helping you diagnose and do it yourself. Problems with electronically controlled engines and transmissions as well as body wiring problems are my specialty.

I take questions one at a time between 8am and 10pm CT and attempt to answer within 20 minutes. "Maxed Out" means I am answering another question of otherwise busy, so try again later.

There are answers on file to more than sixteen thousand Chrysler questions at your finger tips: put a few key words in the "find" box (above) or click on "view past answers" for a chronological list of my q and a's. Don't use "Add to this answer" if you still have a question...ask it. As to trucks and jeeps I only have manuals for the '04-'06 model years.

Experience

Five decades as a 'do-it-yourselfer' on domestic and imported cars

Organizations
Yahoo Autos Group called The Chrysler Lebaron Club (co-moderator)

Education/Credentials
Degrees in Physics/bruised knuckles.

Awards and Honors
"Top expert of 2010" and "2011" at Allexperts. Among top 50 experts for years 2006-2009 at Allexperts.

Quickest "average response time" at Allexperts (currently no. 1).

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