Schematic Reference: Interior Lights Schematics

Did you review the courtesy lamp operation and perform the necessary inspections?

Go to Step 2

Go to Interior Lighting Systems Description and Operation

1. Turn OFF the dome override switch.
2. Open the doors.
3. Turn ON the dome override switch.
4. Turn ON the dome lamp switch.

Does the system operate normally?

Go to Testing for Electrical Intermittents

Go to Step 3

Are the courtesy lamps inoperative from the switch, doors and remote keyless entry, if equipped?

Go to Step 17

Go to Step 4

Is there a single courtesy lamp inoperative?

Go to Step 7

Go to Step 5

Are the courtesy lamps inoperative from the switch only?

Go to Step 15

Go to Step 6

Are the courtesy lamps inoperative from the all doors?

Go to Step 11

Go to Step 9

Remove and inspect the bulb.

Is the bulb OK?

Go to Step 8

Go to Step 19

Connect a test lamp between the battery positive voltage circuit and a good ground.

Does the test lamp illuminate?

Go to Step 24

Go to Step 20

1. Disconnect the inoperative door jamb switch.
2. Open any door that correctly operates the courtesy lamps.
3. Connect a test lamp between the interior lamp defeat switch signal circuit and a battery positive voltage circuit.

Does the test lamp illuminate?

Go to Step 10

Go to Step 23

Connect a test lamp between the ground circuit and a battery positive voltage circuit.

Does the test lamp illuminate?

Go to Step 20

Go to Step 24

1. Disconnect the headlamp switch connector.
2. Open the doors.
3. Connect a test lamp between the interior lamp defeat switch signal circuit of the headlamp switch and a battery positive voltage circuit.

Does the test lamp illuminate?

Go to Step 12

Go to Step 25

Connect a fused jumper wire between the interior lamp control circuit of the headlamp switch connector and a good ground.

Do any courtesy lamps illuminate?

Go to Step 21

Go to Step 13

Test the interior lamp control circuit for an open. Refer to Testing for Continuity in Wiring Systems.

Did you find and correct the condition?

Go to Step 31

Go to Step 14

Connect a fused jumper wire between the courtesy lamp low control circuit of the interior lighting module or keyless entry module and a good ground.

Do any courtesy lamps illuminate?

Go to Step 22

Go to Step 26

1. Disconnect the headlamp switch connector.
2. Connect a test lamp between the ground circuit of the headlamp switch connector and a battery positive voltage circuit.

Does the test lamp illuminate?

Go to Step 24

Go to Step 16

Connect a fused jumper between the ground circuit and the courtesy lamp low control circuit of the headlamp switch connector.

Do any courtesy lamps illuminate?

Go to Step 26

Go to Step 21

1. Remove and inspect the CTSY 3A fuse in the IP fuse block.
2. If the fuse is OK, install the fuse.

Is the fuse open?

Go to Step 23

Go to Step 18

1. Turn ON the courtesy lamps.
2. Disconnect any courtesy lamp.
3. Connect a test lamp between the battery positive voltage circuit of the courtesy lamp and a good ground.

Does the courtesy lamp illuminate?

Go to Step 21

Go to Step 23

Inspect for poor connections at the harness connector of the bulb. 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 31

Go to Step 27

Inspect for poor connections at the harness connector of the inoperative 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 31

Go to Step 28

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 31

Go to Step 29

Inspect for poor connections at the harness connector of the module. 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 31

Go to Step 30

1. Repair the battery positive voltage circuit for an open or a short to ground. Refer to Wiring Repairs in Wiring Systems.
2. Replace the fuse if open.

Did you complete the repair?

Go to Step 31

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Repair the ground circuit for an open. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 31

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Repair the interior lamp defeat switch signal circuit for an open. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 31

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Repair the courtesy lamp low control circuit between the module and splice S230. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 31

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Replace the bulb. Refer to Dome Lamp Replacement or Door Courtesy Lamp and Reflector Replacement .

Did you complete the replacement?

Go to Step 31

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Replace the switch. Refer to Door Jamb Switch Replacement in Doors.

Did you complete the replacement?

Go to Step 31

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Replace the headlamp switch. Refer to Headlamp Switch Replacement .

Did you complete the replacement?

Go to Step 31

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Replace the interior lighting module or the keyless entry module. Refer to Interior Lamp Control Module Replacement in Lighting, or Remote Control Door Lock Receiver Replacement in Keyless Entry.

Did you complete the replacement?

Go to Step 31

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Operate the system in order to verify the repairs.

Did you correct the condition?

System OK

Go to Step 3