Turn Signal Lamps and/or Indicators Inoperative

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. 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: Master Electrical Component List in Wiring Systems.
1	Did you perform the Diagnostic System Check?	Go to Step 2	Go to Diagnostic System Check - Lighting Systems
2	Turn the ignition to the RUN position. Turn the turn signal switch to the TURN LEFT position and then to the TURN RIGHT position. Do the turn signal lamps and the turn signal indicators flash?	Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems	Go to Step 3
3	Are only the turn signal indicators inoperative?	Go to Step 5	Go to Step 4
4	Is only one turn lamp inoperative?	Go to Step 11	Go to Step 6
5	Leave the turn signal switch at the inoperative side. Using a test lamp, backprobe the supply voltage circuit of the turn signal lamp indicator at the instrument panel cluster. Does the test lamp flash?	Go to Step 10	Go to Step 12
6	Disconnect connector C201. Using a test lamp connected to a ground, probe the turn signal battery positive voltage supply circuit. Turn the ignition switch to the RUN position. Does the test lamp illuminate?	Go to Step 7	Go to Step 14
7	Using a test lamp, probe between the turn signal battery positive voltage supply circuit and the left turn signal switch. Turn the ignition to the RUN position. Does the test lamp flash ON and OFF?	Go to Step 8	Go to Step 9
8	Inspect for poor connection at the hazard flasher. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct and the condition?	Go to Step 18	Go to Step 16
9	Inspect for poor connection at the harness connector of the turn signal switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct and the condition?	Go to Step 18	Go to Step 17
10	Inspect for poor connection at the harness connector of the instrument panel cluster. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct and the condition?	Go to Step 18	Go to Step 15
11	Test the inoperative turn signal switch signal circuit for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 18	Go to Step 13
12	Repair the short to ground or open in the inoperative turn signal lamp indicator power supply circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair?	Go to Step 18	-
13	Repair the open or short to ground in the inoperative turn signal lamp power supply or ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair?	Go to Step 18	-
14	Repair the open or short to ground in the battery positive voltage turn signal supply circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you complete the repair?	Go to Step 18	-
15	Replace the instrument panel cluster. Refer to Instrument Panel Cluster (IPC) Replacement in Instrument Panel, Gages, and Console. Did you complete the replacement?	Go to Step 18	-
16	Replace the hazard flasher. Did you complete the replacement?	Go to Step 18	-
17	Replace the turn signal switch. Refer to Multifunction, Turn Signal Switch Replacement in Steering Wheel and Column. Did you complete the replacement?	Go to Step 18	-
18	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 3