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Courtesy Lamps Inoperative

Step

Action

Yes

No

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2
  1. Observe the courtesy lamps.
  2. Open and close all of the vehicle doors.
  3. Place the courtesy lamp switch in the ON position.

Do the courtesy lamps illuminate as expected?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3

Is only one courtesy lamp inoperative?

Go to Step 4

Go to Step 5

4

Test the voltage supply and ground circuits of the inoperative courtesy lamp for an open or high resistance.

Did you find and correct the condition?

Go to Step 23

Go to Step 19

5

Are all courtesy lamps inoperative at all times?

Go to Step 6

Go to Step 7

6

Test the courtesy lamp supply voltage and battery positive voltage circuits of the body control module (BCM) for an open, high resistance, or short to ground.

Did you find and correct the condition?

Go to Step 23

Go to Step 17

7

Are the courtesy lamps inoperative from the front dome lamp switch only?

Go to Step 8

Go to Step 9

8

Test the ground circuit of the front dome lamp switch for an open or high resistance.

Did you find and correct the condition?

Go to Step 23

Go to Step 16

9

Are the courtesy lamps inoperative from all doors and the tailgate?

Go to Step 10

Go to Step 12

10
  1. Open the doors.
  2. Connect a test lamp between the courtesy lamp low control circuit of the front dome lamp connector and battery positive voltage.

Does the test lamp illuminate?

Go to Step 16

Go to Step 11

11

Test the low control circuit of the BCM for an open or high resistance.

Did you find and correct the condition?

Go to Step 23

Go to Step 17

12

With the scan tool, observe the parameter of the door that does not illuminate the courtesy lamps using the following:

    • DRIVER DOOR SWITCH
    • PASS DOOR SWITCH
    • LIFTGATE AJAR SWITCH

Does the parameter switch from HIGH to LOW as expected?

Go to Step 17

Go to Step 13

13
  1. Close all doors that illuminate the courtesy lamps.
  2. Disconnect the inoperative door ajar switch connector.
  3. Connect a 3-amp fused jumper wire between the signal circuit of the connector and a good ground.

Do the courtesy lamps illuminate?

Go to Step 15

Go to Step 14

14

Test the signal circuit of the switch for an open or high resistance.

Did you find and correct the condition?

Go to Step 23

Go to Step 17

15

Test the ground circuit of the switch for an open or high resistance.

Did you find and correct the condition?

Go to S Step 23

Go to Step 18

16

Inspect for poor connections at the wiring harness plug of the front courtesy lamp assembly.

Did you find and correct the condition?

Go to Step 23

Go to Step 20

17

Inspect for poor connections at the wiring harness plug of the BCM.

Did you find and correct the condition?

Go to Step 23

Go to Step 21

18

Inspect for poor connections at the wiring harness plug of the inoperative switch.

Did you find and correct the condition?

Go to Step 23

Go to Step 22

19

Replace the bulb.

Did you complete the replacement?

Go to Step 23

-

20

Replace the bulb or lamp assembly.

Did you complete the replacement?

Go to Step 23

-

21

Replace the BCM. Refer to Body Control Module Replacement .

Did you complete the replacement?

Go to Step 23

-

22

Replace the inoperative switch.

Did you complete the replacement?

Go to Step 23

-

23

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3

   


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