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. Install the scan tool.
2. Turn ON the ignition, with engine OFF.
3. Place the headlamp switch in the PARK position.
4. With the scan tool, observe the Park Lamp Switch parameter in the IPM inputs data list.

Does the Park Lamp Switch data parameter display ON?

Go to Step 4

Go to Step 3

3 |

1. Turn OFF the ignition.
2. Disconnect the C3 harness connector at the turn signal/multifunction switch.
3. Connect a 3-amp fused jumper wire between the park lamp switch ON signal circuit and the turn signal/multifunction switch ground circuit at the turn signal/multifunction switch C3 harness connector.
4. Turn ON the ignition, with the engine OFF.
5. With the scan tool, observe the Park Lamp Switch parameter in the IPM inputs data list.

Does the Park Lamp Switch data parameter display ON?

Go to Step 10

Go to Step 6

4 |

1. Turn OFF the ignition.
2. Disconnect the park lamp relay. Refer to Relay Replacement .
3. Connect a test lamp between the park lamp relay control circuit and the park lamp relay coil side supply voltage circuit at the underhood fuse block.
4. Turn ON the ignition, with the engine OFF.
5. Turn the park lamps ON.

Does the test lamp illuminate?

Go to Step 8

Go to Step 5

5 | Test the park lamp relay control 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 17

Go to Step 12

6 | Locate and repair an open or high resistance in the turn signal/multifunction switch ground circuit. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 17 | Go to Step 7
7 | Locate and repair the following in the park lamp switch ON signal circuit:

• | 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 17

Go to Step 12

8 |

1. Turn OFF the ignition.
2. Connect a 30-amp fused jumper between the park lamp relay switch side supply voltage circuit and the park lamp supply voltage circuit.
3. Turn ON the ignition, with the engine OFF.

Do all of the park lamps illuminate?

Go to Step 11

Go to Step 9

9 | Locate and repair an open or high resistance in the inoperative park lamp supply voltage circuit. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 17 | Go to Step 13
10 | 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 17 | Go to Step 14
11 | Inspect for poor connections at the park lamp relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 17 | Go to Step 15
12 | 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 17 | Go to Step 16
13 | Locate and repair an open or high resistance in the inoperative park lamp ground circuit. Refer to Circuit Testing and Wiring Repairs . Did you complete the repair? | Go to Step 17 | --
14 | Replace the turn signal/multifunction switch. Refer to Turn Signal Multifunction Switch Replacement . Did you complete the replacement? | Go to Step 17 | --
15 | Replace the park lamp relay. Refer to Relay Replacement . Did you complete the replacement? | Go to Step 17 | --
16 | Replace the IPM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 17 | --
17 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2