Turn Signal Lamps and/or Indicators Always On or Flashing

WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.

Step	Action	Yes	No
Schematic Reference: Exterior Lights Schematics Connector End View Reference: Lighting Systems Connector End Views or Data Communication Connector End Views
1	Did you perform the Diagnostic System Check - Vehicle?	Go to Step 2	Go to Diagnostic System Check - Vehicle
2	Turn ON the ignition, with the engine OFF. Operate the turn signal switch in both the left and right hand turn signal positions. Does the turn signal system operate normally?	Go to Testing for Electrical Intermittents	Go to Step 3
3	Test the appropriate turn signal bulb supply voltage circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	Go to Step 10	Go to Step 4
4	Disconnect the turn signal/hazard flasher module. Connect a test lamp between the appropriate turn signal switch signal circuit terminal of the turn signal/hazard flasher module connector and a good ground. Does the test lamp illuminate?	Go to Step 5	Go to Step 6
5	Test the appropriate turn signal switch signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition?	Go to Step 10	Go to Step 7
6	Inspect for poor connections at the harness connector of the turn signal/hazard flasher module. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs . Did you find and correct the condition?	Go to Step 10	Go to Step 8
7	Inspect for poor connections at the harness connector of the turn/hazard switch. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs . Did you find and correct the condition?	Go to Step 10	Go to Step 9
8	Replace the turn signal/hazard flasher module. Refer to Hazard and Turn Signal Flasher Replacement . Did you complete the replacement?	Go to Step 10	-
9	Replace the multifunction, turn signal and hazard switch. Refer to Turn Signal Multifunction Switch Replacement . Did you complete the replacement?	Go to Step 10	-
10	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 3