2008 Saturn Astra Owner's Manual - Page 223

Vehicle Service and Care 9-33 Replacement Bulbs Exterior Lamp Front Turn Signal Lamp License Plate Lamp Parking Lamp Taillamp Bulb Number 3157 NAK W5W 4157K W21 Electrical System Add-On Electrical Equipment Notice: Do not add anything electrical to your vehicle unless you check with your dealer/retailer first. Some electrical equipment can damage your vehicle and the damage would not be covered by your warranty. Some add-on electrical equipment can keep other components from working as they should. Add-on equipment can drain your vehicle's battery, even if your vehicle is not operating. Your vehicle has an airbag system. Before attempting to add anything electrical to your vehicle, see Servicing Your Airbag-Equipped Vehicle on page 1-34. Headlamp Wiring The headlamp wiring is protected by fuses in the fuse block. An electrical overload will cause the lamps to turn off. If this happens, have your headlamp wiring checked right away. For replacement bulbs not listed here, contact your dealer/retailer.