Grand Voyager BCM/Liftgate Wiring

PLYMOUTH VOYAGER
Avatar
GREG MORRIS
  • MEMBER
  • 6 POSTS
Plymouth Grand Voyager LE 190,000 mi 3.8L
In removing the BCM (with battery connected) I think I may have broken the relay or transistor that fires the liftgate solenoid. When I press the button on the dash or the keyless entry I get 12 volts at the button on the dash. I forgot to write down the wire color but I have located it at J1 on the BCM. My question is, what is the wire color of the wire that runs back to the soleniod? This info is missing from the Haynes manual; it doesn't go into any detail on the BCM or its wiring. I am hoping I can avoid removing all the door trim and diagnose this from the dash area.
Mar 24, 2007 at 3:15 PM
Advertisement
Avatar
GREG MORRIS
  • MEMBER
  • 6 POSTS
The wire that goes to B+ on liftgate activation is Yellow w/Black stripe. The solenoid is not firing.
Mar 24, 2007 at 3:17 PM
Avatar
GREG MORRIS
  • MEMBER
  • 6 POSTS
Took liftgate trim off, wire coming from body to solenoid is green/black stripe. There must be a relay somewhere because this wire is not going to the BCM. Fuse #27 for liftgate is ok.
Apr 21, 2007 at 5:04 PM
Avatar
STRAILER
  • ASE Certified Mechanic
  • 54,840 POSTS
  • ASE Certified Mechanic
To trouble shoot electrical problem you need a complete wiring diagram, you can get one here, https://www.2carpros.com/kpages/auto_repair_manuals.htm
May 10, 2007 at 1:19 PM
Avatar
GREG MORRIS
  • MEMBER
  • 6 POSTS
I found the info I needed for free at the public library. They have access to a database called "MotorAllData" that also has schematics.
The problem was on the negative side of the relay drive, which is the liftgate interlock circuit. This signal comes from the BCM and goes low only if the vehicle is not moving and is not in gear. The circuit is part of U103 in the BCM, which I replaced with a MOSFET, IRFD113. Why? Because I can.
May 12, 2007 at 2:44 PM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.