Engine Running With Key Turned Off
By techeditor on March 1, 2008 8:06 PM
On an Enclave, Acadia or Outlook, the engine may continue running with the ignition key turned off. This can happen if circuit 5985 (the ignition 1 circuit going to the ECM) has 5 volts or more on it when the ignition key is turned off.
Check circuit 5985 at the ECM for voltage (5 volts or more) with the ignition key turned off.
If voltage is found on circuit 5985, remove the fuse for the BCM and the TCM one at a time, and see if the engine turns off. If the engine does not turn off, and there is still 5 volts or more on circuit 5985, check circuit 5985 for a short to voltage concern. If the engine doesturn off when pulling the BCM or TCM fuse, replace the module that caused the engine to turn off with the fuse removed.
Water Intrusion
By techeditor on April 1, 2008 4:00 PM
This information supplements an article in the March 2008 TechLink entitled Engine Running With Key Turned Off, which involves voltage on circuit 5985 with the key turned off. The condition described below can be a cause of this voltage.
The owner of an Acadia, Enclave or Outlook may comment that the engine continues to run after the ignition is turned off, or that the engine will not start. This may be the result of water intruding into the instrument panel (IP) BEC. Before proceeding with other diagnosis and repairs, here are some suggestions.
Water from the right front sunroof drain hose exits the vehicle (fig. 13). If it then re-enters the vehicle through the front of dash sheet metal, it can drip from the right side dash onto the IP BEC.
AÂ Â Water exits through drain hose
BÂ Â Water reenters and drips onto IP BEC from sheet metal
The seam must be properly sealed between the plenum upper and plenum reinforcement. This may be inspected from underhood through the opening in the cowl panel
If there are voids in the bead of sealant, use medium-bodied sealant p/n 12378500 to reseal.
The area to be sealed may be reached through two openings, and the seam must be sealed for its entire length (fig. 15).
AÂ Â Access opening
BÂ Â Access opening
CÂ Â Length of seam sealÂ
TIP:Â Sealant may be applied with the fingertip or with a plastic trim tool.