GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Lighting Systems Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

Verify that the courtesy or dome lamps are inoperative.

Do the courtesy and dome lamps operate normally?

--

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

Use the scan tool in order to monitor the following components for proper operation. Refer to Scan Tool Data List in Body Control System for more information.

    • The passenger door jamb/door handle switches
    • The driver door jamb switch
    • The rear door ajar
    • The liftglass/rear gate
    • Key in ignition
    • The courtesy lamp relay
    • The inadvertent power relay
    • The dome override switch
    • The dome lamp switch

Did you locate and correct a condition?

--

Go to Step 18

Go to Step 4

4

Is the CTSY LP 15A fuse IP fuse 8 open?

--

Go to Step 5

Go to Step 8

5

  1. Disconnect the inadvertent power relay from the body relay block.
  2. Connect a J 39200 Digital Multimeter (DMM ) between the inadvertent power relay connector terminal 5 to ground. Refer to Circuit Testing in Wiring Systems.

Is the resistance less than the specified value?

2 ohms

Go to Step 6

Go to Step 7

6

Locate and repair a short to ground in CKT 40 (ORN). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 18

--

7

Locate and repair a short to ground in CKT 1732 (ORN). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 18

--

8

  1. Disconnect the inadvertent power relay from the body relay block.
  2. Test for voltage at terminal 2 of the inadvertent power relay connector. Refer to Circuit Testing in Wiring Systems.

Is the specified voltage present?

B+

Go to Step 10

Go to Step 9

9

Locate and repair an open in CKT 40 (ORN). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 18

--

10

  1. Install the inadvertent power relay in the body relay block.
  2. Open the left front door.
  3. Deactivate the Dome Lamp Overide Switch.

Do the courtesy lamps and the dome lamps illuminate?

--

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

Go to Step 11

11

Open the IP compartment.

Does the IP compartment lamp illuminate?

--

Go to Step 15

Go to Step 12

12

Inspect CKT 1393 (DK BLU) for an open. Refer to Circuit Testing in Wiring Systems.

Is an open present?

--

Go to Step 14

Go to Step 13

13

Replace the inadvertent power relay.

Is the repair complete?

--

Go to Step 18

--

14

Locate and repair the open in CKT 1393 (DK BLU). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 18

--

15

Do the power door locks operate properly?

--

Go to Step 17

Go to Step 16

16

Locate and repair an open in CKT 1850 (BLK). Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Step 18

--

17

Replace the courtesy lamp relay.

Is the repair complete?

--

Go to Step 18

--

18

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3