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Jerry
Jerry, Master Mechanic
Category: Dodge
Satisfied Customers: 1740
Experience:  ASE Master tech, 30 years exp. troubleshooter, driveability tech
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2006 DODGE CARRAVAN, NO ACCESORIES AFTER STARTING MOTOR,

Customer Question

2006 DODGE CARRAVAN, NO ACCESORIES AFTER STARTING MOTOR, THEY WILL START SOMETIMES AFTER 20MIN OR SO
JA: Are you fixing your Caravan yourself? What have you tried so far?
Customer: SWOPPING RELAYS, CLEANED UP GROUNG UNDER BATTERY CASE, NO CHANGE
JA: Have you changed a battery before?
Customer: YES, BATTERY IS NEWER
JA: Anything else you want the mechanic to know before I connect you?
Customer: NO
Submitted: 23 days ago.
Category: Dodge
Customer: replied 23 days ago.
STARTED ABOUT 1 WEEK AGO. ABOUT A 2 MINITE DELAY TO BEGIN WITH AND NOW ABOUT 20 MINITE DELAY BEFORE THE ACCESSARYS START TO WORK AFTER STARTING MOTOR.
Customer: replied 23 days ago.
ON SOME TRIPS, THE ACCESSARYS DO NOT WORK AT ALL(1 HOUR DRIVE)
Expert:  Jared D replied 23 days ago.

It sounds like you may be having trouble with either the BCM (body control module) or the ignition switch.

How much testing do you want to do yourself?

Customer: replied 23 days ago.
As much as possible
Expert:  Jared D replied 23 days ago.

You will need a multimeter and a scan tool preferably.

If you have a scan tool:

Verify the ignition switch position is indicated correctly in the Body Control Module (BCM) and the Front Control Module (FCM). The ignition switch has a built in position sensor that reports the position of the ignition switch to the BCM. The BCM then broadcasts the position to all the modules that need the information on the BUS circuit.

If you have a multimeter:

Check circuit T751 and T752 at the Intelligent Power Module (IPM) for voltage with the engine running. These circuits should have battery voltage only during cranking and should go to 0 volts with the vehicle running. If there is any voltage on these circuits, the FCM will de-energize the accessory relay, which causes the named circuits to shut down, even with the vehicle running. Voltage typically comes from the wire harness due to battery acid from the battery. Voltage gets tracked into these circuits and causes the FCM to shut down the accessory relay. Another cause could be any add-on system such as a remote starter system wired into these circuits.

Customer: replied 22 days ago.
only have a volt meter, could not find any voltage on T751 or T752. Have no auto start connected
Expert:  Jared D replied 22 days ago.

I would probably suspect a bad ignition switch or a wiring issue in the fuse box in that case.

Did you check the accessory relay in the under hood fuse box yet?

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