GMC 2003 Sierra - Manual (Page 445)

Taillamps (Chassis Cab Models) Replacement Bulbs
A Turn Signal Lamp
B. Sloplamp
C. Bacii-up Lamp
1,,. Using your hands, peal the rubber seai away fram
Ihe lens.
2. Lin the lens aff the lamp assembly.
3. Poll the old bulb straight out from the sochel.
4. Pol a new bulb into [he seckel and press it In until it
V'.
is light.
5. Relnslall the lens and Ihe lens se^l.
Exterior Lamp Bulb Nunnber
Low-Beam Headlamps 9006
High-Seam Headlamp 9005
□aylime Running L^mps (DRL) 4157K
Front Roo( Marker Lamps 194
Front Parking and Turn Lamp 3457A
Hoar Marker Lamp, Taillamp and
Stop Lamp"
3157
TailiBfnp and Slop Lamp*^ 1157
Sidemerker Lamp {If Equipped) 194
Rear Turn Lamp 3157
Rear Turn Lamp " 1156
Back-up Lamp 3157
Back-up Lamp" 1156
Center High-Mounted Stoplamp 912
Cargo Lamp 912
Fender Marker Lamps 194
* For any Bulb not listed here, contacl youi dealer.
" Chassis Cab Models
5-70