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 |

1. Turn ON the ignition, with the engine OFF.
2. Place the turn signal lever in the LEFT turn position.
3. Place the turn signal lever in the RIGHT turn position.

Do the appropriate turn signal lamps and/or indicators illuminate for each action?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3 | Is only one turn signal lamp inoperative? | Go to Step 6 | Go to Step 4
4 | Is one or both of the turn signal indicators inoperative? | Go to Step 5 | Go to Step 7
5 |

1. Using a scan tool, command the turn signals for the appropriate side ON.
2. Observe the turn signal indicators.

Does the appropriate turn signal indicator illuminate and flash?

Go to Step 13

Go to Step 11

6 |

1. Disconnect the inoperative turn signal lamp.
2. Probe the turn signal supply voltage circuit of the inoperative lamp with a test lamp that is connected to a good ground.
3. Place the turn signal lever in the position of the inoperative lamp.

Does the test lamp illuminate and flash?

Go to Step 14

Go to Step 15

7 | Do the hazard lamps operate properly? | Go to Step 8 | Go to Hazard Lamps Inoperative
8 |

1. Disconnect the turn signal/multifunction switch.
2. Connect a 3-amp fuse jumper wire between the left turn signal switch signal circuit of the turn signal/multifunction switch and a good ground.

Do the left turn lamps illuminate and flash?

Go to Step 9

Go to Step 10

9 | Connect the 3-amp fused jumper wire between the left turn signal switch signal circuit of the turn signal/multifunction switch and the ground circuit of the turn signal/multifunction switch. Do the left turn lamps illuminate and flash? | Go to Step 12 | Go to Step 16
10 | Test the left turn signal switch signal circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 20 | Go to Step 13
11 | Inspect for poor connections at the harness connector of the instrument panel cluster (IPC). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 20 | Go to Step 17
12 | Inspect for poor connections at the harness connector of the turn/headlamp/wiper switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 20 | Go to Step 18
13 | Inspect for poor connections at the harness connector of the body control module (BCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 20 | --
14 | Repair an open or high resistance in the ground circuit of the inoperative lamp. Refer to Circuit Testing and Wiring Repairs . Did you complete the repair? | Go to Step 20 | --
15 | Repair an open, high resistance, or short to ground in the inoperative turn signal supply voltage circuit. Refer to Circuit Testing and Wiring Repairs . Did you complete the repair? | Go to Step 20 | --
16 | Repair an open or high resistance in the ground circuit of the turn signal/multifunction switch. Refer to Circuit Testing and Wiring Repairs . Did you complete the repair? | Go to Step 20 | --
17 | Replace the IPC. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 20 | --
18 | Replace the turn signal/multifunction switch. Refer to Turn Signal Multifunction Switch Replacement . Did you complete the replacement? | Go to Step 20 | --
19 | Replace the BCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 20 | --
20 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3