GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2002 🢒 Savana 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Courtesy Lamps Always On

Step

Action

Yes

No

Schematic Reference: Interior Lights Schematics

1

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

Go to Step 2

Go to Interior Lighting Systems Description and Operation

2
  1. Close all the doors.
  2. Turn OFF the dome lamp switch.

Do the courtesy lamps turn OFF?

Go to Testing for Electrical Intermittents in Wiring Systems

Go to Step 3

3

Turn ON the dome overide switch.

Are the courtesy lamps still illuminated?

Go to Step 4

Go to Step 5

4
  1. Turn OFF the dome overide switch.
  2. Disconnect the door jamb switches one at a time, checking to see if the courtesy lamps turn off after each disconnect.

Do the courtesy lamps turn off after a disconnect?

Go to Step 10

Go to Step 8

5

Disconnect the headlamp switch.

Are the courtesy lamps still illuminated?

Go to Step 6

Go to Step 11

6
    • If equipped with remote keyless entry (RKE), disconnect the remote control door lock receiver.
    • If equipped without RKE, disconnect the illuminated entry module.

Are the courtesy lamps illuminated?

Go to Step 9

Go to Step 7

7

Test the interior lamp control circuit of the headlamp switch for a short to ground.

Did you find and correct the condition?

Go to Step 16

Go to Step 12

8

Repair the short to ground in the interior lamp defeat switch signal circuit.

Did you complete the repair?

Go to Step 16

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9

Repair the short to ground in the courtesy lamp low control circuit.

Did you complete the repair?

Go to Step 16

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10

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 16

Go to Step 14

11

Inspect for poor connections at the harness connector of the 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 16

Go to Step 13

12

Inspect for poor connections at the harness connector of the remote control door lock receiver or the interior lamp control 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 16

Go to Step 15

13

Replace the switch. Refer to Front Side Door Lock Replacement , Front Side Door Lock Replacement , Rear Door Lock Replacement in Doors, or Rear Door Jamb Switch Replacement in Lighting Systems.

Did you complete the replacement?

Go to Step 16

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14

Replace the headlamp switch. Refer to Headlamp Switch Replacement .

Did you complete the replacement?

Go to Step 16

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15
    • If equipped with RKE, replace the remote control door lock receiver. Refer to Remote Control Door Lock Receiver Replacement in Keyless Entry.
    • If equipped without RKE, replace the interior lamp control module. Refer to Interior Lamp Control Module Replacement .

Did you complete the replacement?

Go to Step 16

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16

Operate the system in order to verify the repair.

Did you correct the condition?

Go to Step 3

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