GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the Interior Lamps System Check performed?

--

Go to Step 2

Go to Interior Lamps System Check

2

Inspect the rear compartment courtesy lamp bulb filament.

Is the rear compartment courtesy lamp bulb filament open?

--

Go to Step 6

Go to Step 3

3

  1. Disconnect the rear compartment courtesy lamp electrical connector.
  2. Turn the ignition switch from the OFF position to the RUN position.
  3. Using a test light, connect between the rear compartment courtesy lamp harness connector terminal A and ground.

Does the test light illuminate?

--

Go to Step 4

Go to Step 7

4

  1. Disconnect the rear compartment courtesy lamp switch electrical connector.
  2. Using a test light, connect between B+ and the rear compartment courtesy lamp switch harness connector terminal B.

Does the test light illuminate?

--

Go to Step 5

Go to Step 8

5

  1. Connect a test light between B+ and the rear compartment courtesy lamp harness connector terminal B.
  2. Connect a 10A fused jumper between the rear compartment courtesy lamp switch harness connector terminals A and B.

Does the test light illuminate?

--

Go to Step 9

Go to Step 10

6

Replace the rear compartment courtesy lamp bulb.

Is the repair complete?

--

System OK

--

7

Important: Inspect for a faulty rear compartment courtesy lamp diode.

Repair the poor connection or an open in circuit 737 or circuit 1393.

Is the repair complete?

--

System OK

--

8

Repair the poor connection or an open in circuit 350.

Is the repair complete?

--

System OK

--

9

Replace the rear compartment courtesy lamp switch.

Is the repair complete?

--

System OK

--

10

Repair the poor connection or an open in circuit 744.

Is the repair complete?

--

System OK

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