GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2000 🢒 Grand Prix 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Courtesy Lamps Always On

Step

Action

Value(s)

Yes

No

DEFINITION: The courtesy lights stay on with all of the doors closed, the IP dimmer switch off, and none of the interior lighting modes activated. The inadvertent load (battery rundown) protection turns off the courtesy lights after 10 minutes.

1

Was the Interior Lamps System Check performed?

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Go to Step 2

Go to Interior Lamps System Check

2

Was the BCM Diagnostic System Check performed?

--

Go to Step 3

Go to Diagnostic System Check - Body Control System in Body Control System

3

Enter the BCM Input/Output test. Refer to Body Control Module Diagnostic Information in Body Control System.

Does the BCM enter the Input/Output test?

--

Go to Step 4

Go to Step 8

4
  1. Perform the BCM Input/Output test.
  2. Observe the following lamps:
    3. • The IP courtesy lamps
    • The door courtesy warning lamps
    • The roof rail courtesy lamps
    • the windshield header courtesy/reading lamps

Do these lamps turn OFF when the BCM performs the Input/Output test 1, and turn ON during tests 2 and 3?

--

Go to Step 5

Go to Step 9

5
  1. Close all of the vehicle doors.
  2. Open, then close each vehicle door, one door at a time.

Does the chime sound when each vehicle door is opened?

--

Go to Step 6

Go to Step 10

6

Is the vehicle equipped with the content theft deterrent (UA6)?

--

Go to Step 7

Go to Step 28

7
  1. Insert the key into the driver's door key cylinder lock.
  2. Turn the key until the key stops (as in trying to unlock the door).

    3. Listen to the chime.

  3. Remove the key from the driver's door key cylinder lock.
  4. Insert the key into the passenger's door key cylinder lock.
  5. Turn the key until the key stops (as in trying to unlock the door).

    6. Listen to the chime.

  6. Remove the key from the passenger's door key cylinder lock.

Upon turning each door key cylinder with the key, does the chime sound?

--

Go to Step 28

Go to Step 14

8
  1. Turn off the IP dimmer switch.
  2. Disconnect the BCM connector C2.
  3. Using a test light, probe between B+ and the BCM harness connector C2 terminal C2.

Does the test light illuminate?

--

Go to Step 17

Go to Step 28

9
  1. Disconnect the BCM connector C1.
  2. Using a DMM, measure the resistance between the BCM harness connector C1 terminal F and ground.

Is the resistance equal to the specified value?

OL (infinite)

Go to Step 28

Go to Step 19

10
  1. Close the driver's door.
  2. Disconnect the BCM connector C2.
  3. Using a DMM, measure the resistance between the BCM harness connector C2 terminal C1 and ground.

Is the resistance equal to the specified value?

OL (infinite)

Go to Step 12

Go to Step 11

11
  1. Leave the DMM connected.
  2. Remove the driver's door interior trim panel. Refer to Front Side Door Trim Panel Replacement in Doors.
  3. Disconnect the driver's left door lock switch electrical connector.
  4. Using the DMM, measure the resistance again.

Is the resistance equal to the specified value?

OL (infinite)

Go to Step 21

Go to Step 20

12
  1. Close all of the vehicle doors.
  2. Disconnect the BCM connector C2.
  3. Using a DMM, measure the resistance between the BCM harness connector C2 terminal C3 and ground.

Is the resistance equal to the specified value?

OL (infinite)

Go to Step 28

Go to Step 13

13
  1. Leave the DMM connected.
  2. Disconnect the right front, left rear, and right rear door lock switches, one switch at a time, until the DMM reads infinite.
    3. • If the DMM shows infinite upon disconnecting one of the door lock switches, replace that door lock switch.
    • If the DMM does not show infinite after all of the door lock switches are disconnected, repair a short to ground in circuit 49.

Is the repair complete?

--

Go to Step 27

--

14
  1. Disconnect the BCM connector C2.
  2. Using a DMM, measure the resistance between the BCM harness connector C2 terminal C5 and ground.

Is the resistance equal to the specified value?

OL (infinite)

Go to Step 18

Go to Step 15

15
  1. Leave the DMM connected.
  2. Disconnect the driver's left key cylinder lock switch.
  3. Using the DMM, measure the resistance again.

Is the resistance equal to the specified value?

OL (infinite)

Go to Step 22

Go to Step 16

16
  1. Leave the DMM connected.
  2. Disconnect the passenger right key cylinder lock switch.
  3. Using the DMM, measure the resistance again.

Is the resistance equal to the specified value?

OL (infinite)

Go to Step 24

Go to Step 23

17
  1. Leave the test light connected.
  2. Disconnect the headlamp switch harness connector.

Does the test light illuminate?

--

Go to Step 26

Go to Step 25

18

Using a DMM, measure the resistance between the BCM harness connector C1 terminal F and ground.

Is the resistance equal to the specified value?

OL (infinite)

Go to Step 29

Go to Step 19

19

Repair the short to ground in circuit 690.

Is the repair complete?

--

Go to Step 27

--

20

Repair the short to ground in circuit 159.

Is the repair complete?

--

Go to Step 27

--

21

Replace the door lock switch. Refer to Front Door Switch Replacement in Doors.

Is the repair complete?

--

Go to Step 27

--

22

Replace the left key cylinder lock switch.

Is the repair complete?

--

Go to Step 27

--

23

Repair the short to ground in circuit 781.

Is the repair complete?

--

Go to Step 27

--

24

Replace the right key cylinder lock switch.

Is the repair complete?

--

Go to Step 27

--

25

Replace the headlamp switch. Refer to Headlamp Switch Replacement .

Is the repair complete?

--

Go to Step 27

--

26

Repair the short to ground in circuit 156.

Is the repair complete?

--

Go to Step 27

--

27
  1. Turn the ignition switch to the OFF position.
  2. Reconnect the connectors and reinstall the components that were removed.
  3. Turn the ignition switch to the RUN position for 6 seconds.
  4. Turn the ignition switch to the OFF position.
  5. Remove the MALL fuse.
  6. Turn the ignition switch to the ACC position. (The BCM sounds the chime a number of times equivalent to the BCM type installed on the vehicle.)
  7. Within 1 second, turn the ignition switch from the ACC position, to the OFF position, then back to the ACC position. (The BCM sounds any DTCs stored.)

Are there any BCM DTCs present?

--

Go to Diagnostic System Check - Body Control System in Body Control System

Go to Interior Lamps System Check

28
  1. Inspect the BCM connectors for poor terminal contact. Repair the connectors as needed.
  2. If the BCM connectors are OK, replace the BCM. Refer to Body Control Module Replacement in Body Control System.

Is the repair complete?

--

Go to Step 27

--

29
  1. Reconnect the BCM connector C1.
  2. Turn the ignition witch from OFF to RUN, then back to OFF.
  3. Turn the IP dimmer switch to the DOME position for 10 minutes.

Did the courtesy lights turn off after 10 minutes, or 3 minutes if the vehicle has less than 15 total accumulated miles?

--

Go to Interior Lamps System Check

Go to Step 28