2008 Cadillac CTS Owner's Manual - Page 201

Service A/C System This message displays when the electronic sensors that control the air conditioning and heating systems are no longer working. Have the climate control system serviced by your dealer/retailer if you notice a drop in heating and air conditioning efficiency. Service Battery Charging System This message displays when there is a problem with the generator and battery charging systems. Driving with this problem could drain the battery. Turn off all unnecessary accessories. Stop and turn off the vehicle as soon as it is safe to do so. Have the electrical system checked by your dealer/retailer. Under certain conditions, the charging system light may also turn on in the instrument panel cluster. See Charging System Light on page 3-36 for more information. Service All Wheel Drive This message displays if a problem occurs with the All-Wheel Drive (AWD) system. Your vehicle will run in 2WD. This could be caused by: Service Brake Assist This message displays if there is a problem with the brake system. The brake system warning light and the antilock brake system (ABS) warning light may also display on the instrument panel cluster. See Brake System Warning Light on page 3-37 and Antilock Brake System Warning Light on page 3-38 for more information. If this happens, stop as soon as possible and turn off the vehicle. Restart the vehicle and check for the message on the DIC display. If the message displays or appears again when you begin driving, the brake system needs service. See your dealer/retailer as soon as possible. See Brakes on page 5-40 for more information. An electronics problem An AWD system oil overheat Worn out or overheated clutch plates Various electrical issues If this message appears, stop as soon as possible and turn off the ignition for 30 seconds. Restart the vehicle and check for the message on the DIC display. If the message is still displayed or appears again when you begin driving, the system needs service. See your dealer/retailer right away. 3-63