Schematic Reference: Interior Lights Schematics

1

Did you perform the Lighting Systems Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

1. Turn ON the ignition, with the engine OFF.
2. Verify that both of the doors are closed properly.
3. Place the interior lamp switch in the OFF position.

Do the courtesy lamps remain illuminated?

Go to Step 3

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

With a scan tool, observe the Interior Lamp Switch parameter in the instrument cluster (IPC) data list.

Does the scan tool indicate that the Interior Lamp Switch parameter is OFF?

Go to Step 5

Go to Step 4

1. Turn OFF the ignition.
2. Disconnect the headlamp switch.
3. Turn ON the ignition, with the engine OFF.
4. With a scan tool, observe the Interior Lamp Switch parameter.

Does the scan tool indicate that the Interior Lamp Switch parameter is OFF?

Go to Step 17

Go to Step 11

With a scan tool, observe both of the Door Jamb Switch parameters in the Body Control Module (BCM) inputs data list.

Does the scan tool indicate that either of the Door Jamb Switch parameters are ON?

Go to Step 6

Go to Step 7

1. Turn OFF the ignition.
2. Disconnect the appropriate door lock actuator.
3. Turn ON the ignition, with the engine OFF.
4. With a scan tool, observe the Door Jamb Switch parameter.

Does the scan tool indicate that the Door Jamb Switch parameter is ON?

Go to Step 12

Go to Step 15

With a scan tool, observe the Key Cylinder Unlock Switch parameter in the Body Control Module (BCM) inputs data list.

Does the scan tool indicate that the Key Cylinder Unlock Switch parameter is ON?

Go to Step 8

Go to Step 10

1. Disconnect the LH door lock cylinder switch.
2. With a scan tool, observe the Key Cylinder Unlock Switch parameter.

Does the scan tool indicate that the Key Cylinder Unlock Switch parameter is ON?

Go to Step 9

Go to Step 16

1. Disconnect the RH door lock cylinder switch.
2. With a scan tool, observe the Key Cylinder Unlock Switch parameter.

Does the scan tool indicate that the Key Cylinder Unlock Switch parameter is ON?

Go to Step 13

Go to Step 16

1. Turn OFF the ignition.
2. Disconnect the COURTESY relay.
3. Turn ON the ignition, with the engine OFF.

Do the courtesy lamps remain illuminated?

Go to Step 20

Go to Step 14

Test the interior lamp switch signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 27

Go to Step 19

Test the door open switch signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 27

Go to Step 18

Test both of the door key switch signal circuits for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 27

Go to Step 18

Inspect for poor connections at the COURTESY relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 27

Go to Step 22

Inspect for poor connections at the harness connector of the door lock actuator. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 27

Go to Step 21

Inspect for poor connections at the harness connector of the door lock cylinder switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 27

Go to Step 23

Inspect for poor connections at the harness connector of the headlamp switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 27

Go to Step 24

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 in Wiring Systems.

Did you find and correct the condition?

Go to Step 27

Go to Step 25

Inspect for poor connections at the harness connector of the Instrument Cluster (IPC). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 27

Go to Step 26

Repair the short to ground in the interior lamp control circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 27

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Replace the door lock actuator. Refer to Door Lock Actuator Replacement in Doors.

Did you complete the replacement?

Go to Step 27

--

Replace the COURTESY relay. Refer to Relay Replacement in Wiring Systems.

Did you complete the replacement?

Go to Step 27

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Replace the door lock cylinder switch. Refer to Door Lock Cylinder Replacement in Doors.

Did you complete the replacement?

Go to Step 27

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Replace the headlamp switch. Refer to Headlamp Switch Replacement

Did you complete the replacement?

Go to Step 27

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Replace the BCM. Refer to Body Control Module Replacement in Body Control System.

Did you complete the replacement?

Go to Step 27

--

Replace the Instrument Cluster (IPC). Refer to Instrument Cluster Replacement in Instrument Panel, Gages and Console.

Did you complete the replacement?

Go to Step 27

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2