Low and High Beams Headlamps Inoperative. Chevrolet Express 2003

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2003 🢒 Express 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Low and High Beams Headlamps Inoperative

Step	Action	Yes	No
Schematic Reference: Headlights Schematics
1	Did you perform the Lighting System Diagnostic System Check?	Go to Step 2	Go to Diagnostic System Check - Lighting Systems
2	Place the headlamp switch in the ON position. Change the dimmer switch position from the high to low beam positions several times. Does the headlamp system operate normally?	Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems	Go to Step 3
3	Are both high and low beam headlamps inoperative?	Go to Step 4	Refer to Headlamps Inoperative - Low Beams or Headlamps Inoperative - High Beams
4	With a scan tool, observe the headlamp switch parameter. Does the scan tool indicate ACTIVE?	Go to Step 7	Go to Step 5
5	Connect a test lamp between the ground circuit of the headlamp switch connector and battery positive voltage. Does the test lamp illuminate?	Go to Step 6	Go to Step 9
6	Test the headlamps switch headlamps on signal circuit of the headlamp switch for a high resistance, and open, or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 12	Go to Step 8
7	Inspect for poor connections to the body control module (BCM). 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 12	Go to Step 10
8	Inspect for poor connections to the headlamp switch. 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 12	Go to Step 11
9	Repair the ground circuit of the headlamp switch. Did you complete the repair?	Go to Step 12	--
10	Important: Perform the setup procedure for the BCM. Replace the BCM. Refer to Body Control Module Replacement Did you complete the replacement?	Go to Step 12	--
11	Replace the headlamp switch. Refer to Headlamp Switch Replacement Did you complete the replacement?	Go to Step 12	--
12	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 3