Some customers may experience a no start because the battery is discharged after the vehicle is parked for more than 8 hours. This may be caused by one or more of the following, resulting in excessive parasitic draw (dark current) on the battery.
1. The vehicle control system may not have gone to sleep because a key fob was left in the vehicle after the ignition switch was turned off and the doors were closed. This is caused by improper BCM control logic which allows a higher parasitic draw (approx. 6A) to continue for approximately 6 minutes until the vehicle control system goes into sleep mode. If the doors are operated frequently for car washing or luggage loading/unloading etc., it prevents the vehicle control system from sleeping during that time.
2. The parking lights may have been left on because the warning sound for lights on is a short ding, and it may not be noticed.
3. [With Full-Auto A/C] The climate control unit may not have gone to sleep because the hazard warning switch was pressed after the ignition was turned off. This is caused by improper control logic of the climate control unit.
To correct these concerns:
1. The control software of the body control module (BCM) has been modified to shorten the time until going into the sleep mode to approximately 2 minutes.
2. The control software of the body control module (BCM) has been modified to change the lights on warning sound
to a continuous one.
3. The control software of the climate control unit has been modified.
