GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2007 🢒 Rendezvous - FWD 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Courtesy Lamps Always On

Step

Action

Yes

No

Schematic Reference: Interior Lights Schematics

Connector End View Reference: Master Electrical Component List

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

2
  1. Turn the ignition to the ON position.
  2. Close all the doors and turn the instrument panel (I/P) dimmer switch to the OFF position.

Are the courtesy lamps OFF?

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3
  1. Install a scan tool.
  2. Turn ON the ignition , with the engine OFF.
  3. With a scan tool, observe the courtesy lamp switch input circuit status.

Is the courtesy lamp switch input circuit ON?

Go to Step 4

Go to Step  5

4
  1. Disconnect the headlamp switch connector.
  2. With a scan tool, observe the courtesy lamp switch input circuit status.

Is the courtesy lamp switch input circuit ON?

Go to Step 9

Go to Step 13

5

With a scan tool, observe the driver door open switch input circuit status.

Is the driver door open switch input circuit active?

Go to Step 6

Go to Step 7

6
  1. Disconnect the LF door latch connector.
  2. With a scan tool, observe the driver door open switch input circuit status.

Is the courtesy lamp switch input circuit active?

Go to Step 10

Go to Step 14

7

With a scan tool, observe the rear, passenger and lift gate door open switches input circuits status.

Is the door open switches input circuits active?

Go to Step 8

Go to Step 12

8
  1. Disconnect each door latch connector one at time.
  2. With a scan tool, observe the door open input circuit status as each door lock connector is disconnected.

Does the courtesy lamp switch input circuit turn inactive when the door latch connectors are disconnected?

Go to Step 15

Go to Step 11

9

Test for a short to ground on the courtesy lamps switch signal circuit. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 17

Go to Step 16

10

Test for a short to ground on the driver door open switch input circuit. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 17

Go to Step 16

11

Test for a short to ground on the open door switch input circuits. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 17

Go to Step 16

12

Test for a short to ground in the courtesy lamps control circuit. Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

Go to Step 17

Go to Step 16

13

Replace the headlamp switch. Refer to Headlamp Switch Replacement .

Did you complete the repair?

Go to Step 17

--

14

Replace the drivers door latch switch. Refer to Rear Door Lock Replacement .

Did you complete the repair?

Go to Step 17

--

15

Replace the inoperative door latch switch. Refer to the following:

Did you complete the repair?

Go to Step 17

--

16

Replace the body control module (BCM). Refer to Control Module References for replacement, setup, and programming.

Did you complete the repair?

Go to Step 17

--

17

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2