GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Remove the POWER SEATS circuit breaker.
  2. Using an ohmmeter, inspect the circuit breaker for an open.

Is the POWER SEATS circuit breaker open?

--

Go to Step 2

Go to Step 30

2

Using a test light, frontprobe between the fuse block terminal N2 circuit 340 and B+.

Is the test light on?

--

Go to Step 3

Go to Step 4

3

Repair the short to ground in circuit 340.

Is the repair complete?

--

Go to Step 29

--

4

  1. Leave the test light in the same location.
  2. Press the fuel filler door release switch.

Is the test light on when pressing the switch?

--

Go to Step 26

Go to Step 27

5

  1. Disconnect the fuel tank filler door lock actuator connector.
  2. Using a test light, backprobe between the fuel tank filler door lock actuator connector terminals A and B.
  3. Press the fuel tank filler door release switch.

Is the test light on?

--

Go to Step 6

Go to Step 7

6

Inspect the fuel tank door lock assembly for mechanical interference.

Is there mechanical interference?

--

Go to Step 8

Go to Step 9

7

Using a test light, backprobe between the fuel tank filler door lock actuator connector terminal  B and B+.

Is the test light on?

--

Go to Step 10

Go to Step 11

8

Repair the mechanical interference.

Is the repair complete?

--

Go to Step 29

--

9

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

Is the repair complete?

--

Go to Step 29

--

10

  1. Using a test light, backprobe between the fuel tank filler door lock relay connector terminal A2 and ground.
  2. Press the fuel tank filler door release switch.

Is the test light on?

--

Go to Step 12

Go to Step 13

11

Repair the poor connection or open in circuit 350.

Is the repair complete?

--

Go to Step 29

--

12

Repair the poor connection or open in circuit 79.

Is the repair complete?

--

Go to Step 29

--

13

Using a test light, backprobe between the fuel tank filler door lock relay connector terminal A1 and ground.

Is the test light on?

--

Go to Step 14

Go to Step 21

14

Using a test light, backprobe between the fuel tank filler door lock relay connector terminal C1 and ground.

Is the test light on?

--

Go to Step 15

Go to Step 16

15

  1. Using a test light, backprobe between the fuel tank filler door lock relay connector terminal C2 and B+.
  2. Press the fuel tank filler door release switch.

Is the test light on?

--

Go to Step 17

Go to Step 18

16

  1. Remove the POWER SEATS circuit breaker.
  2. Using a test light, frontprobe between the fuse block terminal N1 and ground.

Is the test light on?

--

Go to Step 22

Go to Step 23

17

Replace the fuel tank filler door lock relay.

Is the repair complete?

--

Go to Step 29

--

18

  1. Using a test light, backprobe between the rear compartment lid and fuel tank filler door release switch connector terminal 1 and B+.
  2. Press the fuel tank filler door release switch.

Is the test light on?

--

Go to Step 19

Go to Step 20

19

Repair the poor connection or open in circuit 186.

Is the repair complete?

--

Go to Step 29

--

20

Replace the rear compartment lid and fuel tank filler door release switch. Refer to Instrument Panel Multifunction Switch Assembly Replacement in Instrument Panel, Gauges and Console.

Is the repair complete?

--

Go to Step 29

--

21

Using a test light, backprobe between the underhood accessory wiring junction block harness connector C2 terminal A9 and ground.

Is the test light on?

--

Go to Step 24

Go to Step 25

22

Repair the poor connection or open in circuit 340.

Is the repair complete?

--

Go to Step 29

--

23

Repair the battery feed to the fuse block.

Is the repair complete?

--

Go to Step 29

--

24

Repair the poor connection or open in circuit 275.

Is the repair complete?

--

Go to Step 29

--

25

Replace the underhood accessory wiring junction block. Refer to Underhood Electrical Center or Junction Block Replacement in Wiring Systems.

Is the repair complete?

--

Go to Step 29

--

26

  1. Leave the test light in the same location.
  2. Disconnect the fuel tank filler door lock actuator.
  3. Press the fuel tank filler door release switch.

Does the light illuminate when the switch is present?

--

Go to Step 28

Go to Step 9

27

Replace the POWER SEATS circuits breaker.

Is the repair complete?

--

Go to Step 29

--

28

Repair the short to ground in circuit 79.

Is the repair complete?

--

Go to Step 29

--

29

  1. Turn the ignition switch to the off position.
  2. Reconnect the connectors and reinstall the components that were removed.

Is the action complete?

--

Go to Fuel Filler Door Release System Check

--

30

Inspect the R/CMPT REL fuse in the underhood accessory wiring junction block.

Is the R/CMPT REL fuse open?

--

Go to Step 31

Go to Step 5

31

Repair the short to ground in circuit 840.

Is the repair complete?

--

Go to Step 29

--