GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

SCHEMATIC REFERENCE: Body Rear End Schematics

1

Did you perform the Diagnostic System Check - Body Rear End?

--

Go to Step 2

Go to Diagnostic System Check - Body Rear End

2

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF, car in PARK.
  3. With a scan tool, command the trunk release ON and OFF

Does the trunk release relay turn ON and OFF with each command?

--

Go to Step 3

Go to Step 4

3

Did the trunk release operate?

--

Go to Step 9

Go to Step 7

4

  1. Turn OFF the ignition.
  2. Disconnect the trunk release relay.
  3. Probe the feed circuit of the trunk release relay with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

--

Go to Step 5

Go to Step 12

5

  1. Connect a test lamp between the coil feed circuit of the trunk release relay and the coil control circuit of the trunk release relay.
  2. With a scan tool, command the trunk release ON and OFF

Does the test lamp turn ON and OFF with each command?

--

Go to Step 21

Go to Step 6

6

Does the test lamp remain illuminated with each command?

--

Go to Step 13

Go to Step 14

7

  1. Disconnect the trunk release actuator.
  2. Probe the input circuit of the trunk release actuator with a test lamp that is connected to a good ground.
  3. With a scan tool, command the trunk release ON and OFF

Does the test lamp turn on and off with each command?

--

Go to Step 8

Go to Step 15

8

  1. Connect a test lamp between the input circuit of the trunk release actuator and the ground circuit of the trunk release actuator.
  2. With a scan tool, command the trunk release ON and OFF

Does the test lamp turn on and off with each command?

--

Go to Step 20

Go to Step 16

9

With a scan tool, observe the trunk release switch parameter in the drivers door module (DDM) data list.

Does the scan tool display OFF?

--

Go to Step 10

Go to Step 17

10

  1. Disconnect the trunk release switch.
  2. Measure the voltage between the input circuit of the trunk release switch and a good ground.

Does the voltage measure near the specified value?

5 V

Go to Step 11

Go to Step 18

11

Measure the voltage between the input circuit of the trunk release switch and the ground circuit of the trunk release switch.

Does the voltage measure near the specified value?

5 V

Go to Step 23

Go to Step 19

12

Repair the high resistance or open in the feed circuit of the trunk release relay. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 30

--

13

Test the coil control circuit of the trunk release relay for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 30

Go to Step 22

14

Test the coil control circuit of the trunk release relay for a short to voltage or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 30

Go to Step 22

15

Test the input circuit of the trunk release actuator for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 30

Go to Step 21

16

Repair the high resistance or open in the ground circuit of the trunk release actuator. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 30

--

17

Test the input circuit of the trunk release switch for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 30

Go to Step 24

18

Test the input circuit of the trunk release switch for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 30

Go to Step 24

19

Repair the high resistance or open in the ground circuit of the trunk release switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 30

--

20

Inspect for poor connections at the trunk release actuator. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 30

Go to Step 25

21

Inspect for poor connections at the trunk release relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 30

Go to Step 26

22

Inspect for poor connection at the harness connector of the rear integration module (RIM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 30

Go to Step 27

23

Inspect for poor connection at the harness connector of the trunk release switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 30

Go to Step 28

24

Inspect for poor connections at the harness connector of the front door switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 30

Go to Step 29

25

Replace the trunk release actuator. Refer to Rear Compartment Lid Latch Replacement .

Did you complete the replacement?

--

Go to Step 30

--

26

Replace the trunk release relay.

Did you complete the replacement?

--

Go to Step 30

--

27

Replace the RIM. Refer to Rear Integration Body Control Module Replacement in Body Control System.

Did you complete the replacement?

--

Go to Step 30

--

28

Replace the trunk release switch. Refer Rear Compartment Release Switch Replacement .

Did you complete the replacement?

--

Go to Step 30

--

29

Replace the front door switch. Refer to Front Door Switch Replacement .

Did you complete the replacement?

--

Go to Step 30

--

30

Operate the system for which the symptom occurred.

Did you correct the condition?

--

System OK

Go to Step 2