For 1990-2009 cars

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 | Verify that the turn signal lamps and/or indicators are always ON or flashing. Do the turn signal lamps operate normally? | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3
3 | Inspect the affected bulb/socket for an internal short, poor terminal contact, or a shorted filament. Was a problem found? | Go to Step 8 | Go to Step 4
4 | Disconnect the multifunction turn signal switch. Do the affected turn signals and indicators still illuminate? | Go to Step 5 | Go to Step 6
5 | Test for a high resistance or short to ground in the turn signal switch signal circuit. Did you find and correct the condition? | Go to Step 11 | Go to Step 7
6 | Inspect for poor connections at the multifunction turn signal switch. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 11 | Go to Step 9
7 | Inspect for poor connections at the body control module (BCM). Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 11 | Go to Step 10
8 | Replace or repair the affected bulb/socket. Refer to Park/Turn Signal/Side Marker Lamp Bulb Replacement or Tail Lamp Bulb Replacement . Did you complete the repair? | Go to Step 11 | --
9 | Replace the turn signal/multifunction switch. Refer to Turn Signal Multifunction Switch Replacement . Did you complete the repair? | Go to Step 11 | --
10 | Replace the BCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the repair? | Go to Step 11 | --
11 |

1. Use the scan tool in order to clear any induced DTCs.
2. Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3