GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Body Rear End Schematics

1

Did you perform the Body Rear End Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Body Rear End

2

Operate the fuel tank filler door lock release switch.

Does the fuel door operate?

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

Go to Step 3

3

  1. Disconnect the fuel tank filler door lock release switch.
  2. Connect a test lamp between the battery positive voltage circuit of the fuel tank filler door lock release switch and a good ground.

Does the test lamp illuminate?

Go to Step 4

Go to Step 9

4

Connect a test lamp between the battery positive voltage circuit of the fuel tank filler door lock release switch and the control circuit of the fuel tank filler door lock actuator.

Does the test lamp illuminate?

Go to Step 7

Go to Step 5

5

  1. Connect the fuel tank filler door lock release switch.
  2. Disconnect the fuel tank filler door lock actuator.
  3. Connect a test lamp between the control circuit of the fuel tank filler door lock actuator and a good ground.
  4. Operate the fuel tank filler door lock release switch.

Does the test lamp illuminate?

Go to Step 6

Go to Step 10

6

  1. Connect a test lamp between the control circuit of the fuel tank filler door lock actuator and the ground circuit of the fuel tank filler door lock actuator.
  2. Operate the fuel tank filler door lock release switch.

Does the test lamp illuminate?

Go to Step 8

Go to Step 11

7

Inspect for poor connections at the harness connector of the fuel tank filler door lock 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 14

Go to Step 12

8

Inspect for poor connections at the harness connector of the fuel tank filler door lock 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 14

Go to Step 13

9

Repair the open or high resistance in the battery positive voltage circuit of the fuel tank filler door lock release switch. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 14

--

10

Repair the open or high resistance in the control circuit of the fuel tank filler door lock release actuator. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 14

--

11

Repair the open or high resistance in the ground circuit of the fuel tank filler door lock release actuator. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 14

--

12

Replace the fuel tank filler door lock release switch.

Did you complete the replacement?

Go to Step 14

--

13

Replace the fuel tank filler door lock release actuator. Refer to Fuel Tank Filler Door Lock Actuator Replacement .

Did you complete the replacement?

Go to Step 14

--

14

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3