Battery Goes Dead - keywords BCM draw parasitic
| Subject: | Battery Goes Dead |
| Models: | 2006- 2008 Buick Lucerne and Cadillac DTS |
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
Some customers may comment their battery goes dead when the vehicle is parked. Battery electrical drain/parasitic load testing may reveal an abnormally high current draw that is traced to the F12 BCM LOGIC fuse (2006-2007 vehicles) and BCM Fuse 19 (2008 vehicles) located in the rear fuse block. The concern may be intermittent.
Recommendation/Instructions:
The cause could be a short to ground on circuit 1732. With the interior lights off, measure resistance to ground using an ohm meter on BCM C2 pin 1 (06- 07 model year), or BCM X2 pin 1 (08 model year).
Note: It may be necessary to manipulate the body harness while testing to reveal intermittent concerns.
There should be no conductive path to ground (OL) on circuit 1732 with the interior lights off. If a conductive path to ground is detected, the short must be located. Likely locations for circuit 1732 to become shorted are:
| • | Under the passenger floor sill plate near the passenger front seat. |
| • | S372 (06- 07 model year) or J372 (08 model year) located behind the rear seat back. The insulating tape may be out of position allowing for contact between the splice and ground shielding that is also in the wire harness. |
| • | Near the sunshades above the headliner. |
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
