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2004 Chrysler Pacifica (early build) Instrument

2004 Chrysler Pacifica (early build) Instrument panel will not shut off once it has been activated by key. Must disconnect battery ground to shut off; will not go back ON until key is inserted & turned. Ignition run/start switch tests perfect it is certain that its good & in perfect order. Car seems to run OK but have avoided running it to prevent more serious damage. No fault codes are returned by generic OBD2 code readers. I do not have access to MOPAR diagnostic scan tool; a handicap- my [brand new, inexpensive] scan tool may not be properly initialized but it seems to recognize [2]SAE J8150 VPW modules as present, one ID is $10 the other as $18 ("Modules Present (new line)ID:Protocol (new line)$10:SAE J1850 VPW"- other module described on next line) I would like to verify voltages at WIRING on both connectors to the instrument panel (lower-left of panel) as well as verify voltages to the ignition run/start [electrical] switch connector terminals at various key-in states (to evaluate the CONTROL BUS wires etc, not to test the run/start switch already verified good) Ive mentioned what information I wanted; if you believe other course of action by me is more appropriate I will conceed to your experience Would appreciate your help greatly. I have 04 wiring diagrams book for pacifica over 200pages I think- it calls for a lot of work to DIGITIZE FROM PAPER and upload- It should be worth more than 5 points if you do not already have one loaded into your databases- IF YOU NEED IT PLEASE ADVISE! (its too much time & work for no avail if you already have this information, but if you can use it I am happy to share in return for your advice and ongoing help)

Posted by Anonymous on


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I have a similar problem with my 94 concorde... and was advised the on board computer was in need of replacement. Further research led to pulling the computer and cleaning the ground connection to the chassis. It will sometimes leak under the computer and corrode, and compromise the ground, which in turn will cause faulty "code" readings and the engine control light to come on.

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The ECM is most likey the culprit but I would check ground wires and wiring harness to be sure they aren't faulty. With you telling me the voltage is too high, it pretty much points to wiring but the ECM may have gone bad and its just sending blind signals hence the high voltage. The engine light isn't coming maybe because of the ECM isn't working. Pray it isnt the ECM, its costly but exhaust your options by checking wiring and ground beforing fingering the ECM

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SOURCE: dead cylinders 2003 sebring

it sounds like you may have the wires on the wrong coil. It should be #1 on the #4 coil, and the #3 wire on the #2 coil. you probably have them backwards so 1 and 3 are firing on the exhaust stroke.
the firing order is 1-3-4-2.
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