2004 Caravan, gas 220K with wheel chair ramp & conversion installed when new. Issues are recent. No remote start.
complaint of no blower motor, power windows, no radio, no headlights, no power seat, no wipers. Horn is intermittent, sometimes quieter & sometimes normal.
Starts & drives good. Sometimes battery drains.
scanned for codes, history for lost com to TCM. BUT, found when scanner plugs in port- all of the accessory work! Unplug scanner, accessories quit.
tested fuses for draw, found no draw. Engine off, keys out, I took a break. Then I heard clicking- found accessory relay in fuse box clicking. Removed relay to continue break in peace. Relay is good & when put back after, no clicking.
key is still out. Printed wiring diagrams- as I’m making sense of them, clicking returns. This time it’s the shut down relay. Stopped after about a minute- though vehicle hadn’t been touched in almost an hour.
What could be going on here?! How can scanning wake up the CANbus for all those functions to work, yet some of them are on different systems, and everything else operates as it should?!
Note: I’m just a tech at a shop but our mechanic is also puzzled!
6:26 is a Ford Explorer
Sorry. At 7:26
Well you obviously have some kind of computer wiring failure there. I would assume it has a problem in the computer itself knowing those dodges. But you're going to have to check all the wiring cuz if you got a shorten the wiring it can do the same thing in there. Literally hundreds of wires to feed the computer
The DLC has 2 ground terminals. One Ground is Chassis Ground.
The other Ground is the Computer Ground.
When you plug in a scanner it bridges the 2 Grounds and the faulty Ground gets Grounded through the good Ground.
What happens when you jump the two DLC Ground terminals together?
Do the accessories work?
I like this, I think its a grounding issue as well.
Sounds a lot like you have damaged wiring inside the dashboard wiring harness.
there could be moisture in there, rodent damage, or sometimes people get a little crazy with drills.
