GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 1999 🢒 Grand Prix 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Roof Rail Courtesy/Reading Lamp Inoperative

Step

Action

Value(s)

Yes

No

DEFINITION: The roof rail courtesy or courtesy/reading lamps do not turn on when the courtesy lights are on.

1

Was the Interior Lights System Check performed?

--

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

Is the inoperative lamp the courtesy/reading lamp?

--

Go to Step 4

Go to Step 5

4

Inspect the roof rail courtesy/reading lamp bulb filament.

Is the roof rail courtesy lamp bulb filament open?

--

Go to Step 13

Go to Step 14

5

Inspect the roof rail courtesy lamp bulb filament.

Is the roof rail courtesy lamp bulb filament open?

--

Go to Step 6

Go to Step 7

6

Replace the roof rail courtesy lamp bulb.

Is the repair complete?

--

Go to Step 12

--

7
  1. Disconnect the roof rail courtesy lamp electrical connector.
  2. Turn the ignition switch from the OFF position to the RUN position.
  3. Turn the IP dimmer switch to the DOME position.
  4. Use a test light in order to connect between the roof rail courtesy lamp harness connector terminal 1 and ground.

Does the test light illuminate?

--

Go to Step 8

Go to Step 9

8

Use a test light in order to connect between the roof rail courtesy lamp harness connector terminal 1 and 2.

Does the test light illuminate?

--

Go to Step 10

Go to Step 11

9

Repair the poor connection or open in circuit 1393.

Is the repair complete?

--

Go to Step 12

--

10

Replace the roof rail lamp assembly.

Is the repair complete?

--

Go to Step 12

--

11

Repair the poor connection or open in circuit 690.

Is the repair complete?

--

Go to Step 12

--

12
  1. Turn the ignition switch to the OFF position.
  2. Reinstall the connectors/components as needed.
  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 PGM 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 one 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

13

Replace the roof rail courtesy/reading lamp bulb.

Is the repair complete?

--

Go to Step 12

--

14
  1. Disconnect the roof rail courtesy/reading lamp electrical connector.
  2. Turn the ignition switch from the OFF position to the RUN position.
  3. Turn the IP dimmer switch to the DOME position.
  4. Use a test light in order to connect between the roof rail courtesy/reading lamp harness connector terminal A and ground.

Does the test light illuminate?

--

Go to Step 15

Go to Step 16

15

Use a test light in order to connect between the roof rail courtesy/reading lamp harness connector terminal A and B.

Does the test light illuminate?

--

Go to Step 17

Go to Step 18

16

Repair the poor connection or open in circuit 1393.

Is the repair complete?

--

Go to Step 12

--

17

Use a test light in order to connect between the roof rail courtesy/reading lamp harness connector terminal A and C.

Does the test light illuminate?

--

Go to Step 19

Go to Step 20

18

Repair the poor connection or open in circuit 690.

Is the repair complete?

--

Go to Step 12

--

19

Replace the roof rail courtesy/reading lamp assembly.

Is the repair complete?

--

Go to Step 12

--

20

Repair the poor connection or open in circuit 350.

Is the repair complete?

--

Go to Step 12

--