For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Exterior Lights Schematics Connector End View Reference: Master Electrical Component List
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle
2 | Are only the turn signal indicators in the instrument panel cluster (IPC) always ON or flashing? | Go to Step 10 | Go to Step 3
3 | Test the appropriate turn signal lamp 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 15 | Go to Step 4
4 |

1. Turn OFF the ignition.
2. Disconnect the C3 harness connector at the instrument panel module (IPM).
3. Connect a test lamp between the appropriate front turn signal switch signal circuit at the IPM harness connector and ground.

Does the test lamp illuminate?

Go to Step 5

Go to Step 6

5 | Locate and repair a short to voltage in the appropriate front turn signal switch signal circuit. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 15 | Go to Step 8
6 |

1. Disconnect the IPM.
2. Turn ON the ignition, with the engine OFF.
3. Observe the turn signals.

Did the turn signals turn OFF?

Go to Step 7

Go to Step 9

7 | Inspect for poor connections at the harness connector of the IPM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 15 | Go to Step 13
8 | Inspect for poor connections at the harness connector of the turn signal/multifunction switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 15 | Go to Step 11
9 | Inspect for poor connections at the harness connector of the rear integration module (RIM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 15 | Go to Step 14
10 | Inspect for poor connections at the harness connector of the IPC. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 15 | Go to Step 12
11 | Replace the turn signal/multifunction switch. Refer to Turn Signal Multifunction Switch Replacement . Did you complete the replacement? | Go to Step 15 | --
12 | Replace the IPC. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 15 | --
13 | Replace the IPM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 15 | --
14 | Replace the RIM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 15 | --
15 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2