GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

Open the rear compartment lid.

Do the courtesy lamps illuminate?

--

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

Go to Step 3

3

  1. Disconnect the rear compartment lid ajar indication switch.
  2. Connect a 15A fused jumper between the switch connector terminal A and terminal B. Refer to Circuit Testing in Wiring Systems.

Do the courtesy lamps turn on?

--

Go to Step 5

Go to Step 4

4

Connect a 15A fused jumper between the switch connector terminal B and ground. Refer to Circuit Testing in Wiring Systems.

Do the courtesy lamps turn on?

--

Go to Step 9

Go to Step 7

5

Test for and repair a poor connection at the rear compartment lid ajar indication switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and repair a poor connection?

--

Go to Step 11

Go to Step 6

6

Replace the rear compartment lid ajar indicator switch. Refer to Endgate Latch Replacement in Body Rear End.

Did you complete the replacement?

--

Go to Step 11

--

7

Test for and repair an open in circuit 737 between the switch and the BCM. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and repair an open?

--

Go to Step 11

Go to Step 8

8

Test for and repair a poor connection at the BCM connector C3 terminal D13. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and repair a poor connection?

--

Go to Step 11

Go to Step 10

9

Repair the open in circuit 1550 between the switch and S470. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 11

--

10

Replace the BCM. Refer to Body Control Module Replacement in Body Control System.

Did you complete the replacement?

--

Go to Step 11

--

11

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3