Exterior Courtesy Lamps Inoperative. GMC Truck GMC K Sierra

For 1990-2009 cars only

Makes 🢒 GMC_Truck 🢒 2003 🢒 GMC K Sierra - 4WD 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Exterior Courtesy Lamps Inoperative

Step	Action	Yes	No
Schematic Reference: Interior Lights Schematics Connector End View Reference: Lighting Systems Connector End Views or Body Control System Connector End Views
1	Did you perform the Lighting Diagnostic System Check?	Go to Step 2	Go to Diagnostic System Check - Lighting Systems
2	Open any door. Do the exterior courtesy lamps operate correctly?	Go to Testing for Electrical Intermittents in Wiring Systems	Go to Step 3
3	Do the interior courtesy lamps illuminate?	Go to Step 4	Go to Courtesy Lamps Inoperative
4	Disconnect the outside rear view (OSRV) mirror connector from the driver door module (DDM) or passenger door module (PDM). Test for continuity between the door exterior courtesy lamp supply voltage circuit and the door exterior courtesy lamp ground circuit of the OSRV mirror connector. Refer to Testing for Continuity In Wiring Systems. Is continuity present?	Go to Step 6	Go to Step 5
5	Inspect the bulb for an open filament. Is the bulb OK?	Go to Step 7	Go to Step 8
6	Inspect for poor connections at the harness connector of the DDM or PDM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 11	Go to Step 9
7	Inspect for poor connections at the harness connector of the OSRV mirror. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 11	Go to Step 10
8	Replace the bulb. Refer to Outside Rearview Mirror Courtesy Lamp Replacement . Did you complete the replacement?	Go to Step 11	--
9	Replace the DDM or PDM. Refer to Door Lock and Side Window Switch Replacement - Driver Side or Door Lock and Side Window Switch Replacement - Passenger Side in Doors. Did you complete the replacement?	Go to Step 11	--
10	Replace the mirror. Refer to Outside Rearview Mirror Replacement in Doors. Did you complete the replacement?	Go to Step 11	--
11	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 3