For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Exterior Lights Schematics
1 | Did you review the exterior lighting description and operation and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - Lighting Systems
2 |

1. Probe the tractor/trailer receptacle inoperative rear trailer stop/turn lamp supply voltage circuit with a test lamp that is connected to a good ground.
2. Place the turn signal switch in the TURN position of the inoperative side.

Does the test lamp illuminate and flash?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3 | Do the vehicle's turn signals operate properly? | Go to Step 4 | Go to Turn Signal Lamps and/or Indicators Inoperative
4 | Repair an open, high resistance, or short to ground in the tractor/trailer receptacle inoperative rear trailer stop/turn lamp supply voltage circuit. Refer to Circuit Testing and Wiring Repairs in wiring systems. Did you complete the repair? | Go to Step 5 | --
5 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3