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) inoperative? | Go to Step 15 | Go to Step 3
3 | Is only one turn signal lamp inoperative? | Go to Step 4 | Go to Step 5
4 | Test the inoperative turn signal lamp supply voltage circuit for the following:

• | An open

• | A high resistance

• | A short to ground

Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 21

Go to Step 16

5 |

1. Install the scan tool.
2. Turn ON the ignition, with the engine OFF.
3. With the scan tool, observe the RF, RR, LF, and LR Turn/Hazard Lamp Command parameters in the rear integration module (RIM) lighting data list.
4. Operate the turn signal switch from the left turn to right turn positions.

Does the scan tool indicate that the RF, RR, LF, and LR Turn/Hazard Lamp Command parameters change state with the turn signal switch?

Go to Step 12

Go to Step 6

6 |

1. Turn OFF the ignition.
2. Disconnect the C1 harness connector at the turn signal/multifunction switch.
3. Connect a 3-amp fused jumper between the right front turn signal switch signal circuit and ground.
4. Turn ON the ignition, with the engine OFF.

Do the right turn signals operate correctly?

Go to Step 7

Go to Step 8

7 |

1. Turn OFF the ignition.
2. Connect a 3-amp fused jumper between the left front turn signal switch signal circuit and ground.
3. Turn ON the ignition, with the engine OFF.

Do the left turn signals operate correctly?

Go to Step 9

Go to Step 8

8 | Test the turn signal switch supply voltage circuit for the following:

• | An open

• | A high resistance

• | A short to voltage

Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 21

Go to Step 10

9 | Test the turn signal/multifunction switch ground circuit for an open or high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 21 | Go to Step 11
10 | Inspect for poor connections at the C3 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 21 | Go to Step 19
11 | Inspect for poor connections at the C1 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 21 | Go to Step 17
12 | Test the ground circuits of the turn signal lamps for opens or high resistances. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 21 | Go to Step 13
13 | Test the supply voltage circuits of the turn signal lamps for opens or high resistances. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 21 | Go to Step 14
14 | 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 21 | Go to Step 20
15 | 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 21 | Go to Step 18
16 | Locate and repair an open or high resistance in the ground circuit of the inoperative turn signal lamp. Refer to Wiring Repairs . Did you complete the repair? | Go to Step 21 | --
17 | Replace the turn signal/multifunction switch. Refer to Turn Signal Multifunction Switch Replacement . Did you complete the replacement? | Go to Step 21 | --
18 | Replace the IPC. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 21 | --
19 | Replace the IPM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 21 | --
20 | Replace the RIM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 21 | --
21 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2