GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the Diagnostic System Check performed?

--

Go to Step 2

Fuel Filler Door Release System Check

2

Press the trunk lid release switch on the keyless entry transmitter.

Does the trunk lid open?

--

Go to Step 26

Go to Step 3

3

Press the fuel door release switch on the instrument panel.

Does the fuel door open?

--

Go to Step 14

Go to Step 4

4

Inspect the ALDL fuse and the body fuse located in the rear junction block.

Are both fuses good?

--

Go to Step 6

Go to Step 5

5

Replace the fuse.

Is the repair complete?

--

Fuel Filler Door Release System Check

--

6

Measure the voltage at pin C1 connector C2 of the rear junction block.

Is the voltage within the specified range?

10 -15  volts

Go to Step 8

Go to Step 7

7

Replace the rear junction block.

Is the repair complete?

--

Fuel Filler Door Release System Check

--

8

Measure the voltage at pin A10, connector C2 of the rear junction block.

s the voltage within the specified range?

10 -15  volts

Go to Step 7

Go to Step 9

9

Measure the voltage at pin A of the valet switch.

Is the voltage within the specified range?

10 -15  volts

Go to Step 11

Go to Step 10

10

Repair the open in CKT 3640.

Is the repair complete?

--

Fuel Filler Door Release System Check

--

11

Measure the voltage at pin B of the valet switch.

Is the voltage within the specified range?

10 -15  volts

Go to Step 13

Go to Step 12

12

Replace the valet switch.

Is the repair complete?

--

Fuel Filler Door Release System Check

--

13

Repair the open in circuit 253.

Is the repair complete?

--

Fuel Filler Door Release System Check

--

14

Measure the voltage at terminal A5 of the rear integration module to ground.

Is the voltage within the specified range?

10 -15  volts

Go to Step 15

Go to Step 19

15

  1. Disconnect the harness connector from the rear integration module.
  2. Use a fused jumper wire in order to jumper terminal A5 of the rear integration module harness connector to ground.

Does the fuel door open?

--

Go to Step 16

Go to Step 17

16

Replace the rear integration module.

Is the repair complete?

--

Fuel Filler Door Release System Check

--

17

With the jumper still connected, measure the voltage at terminal A9, connector C2 at the rear junction block.

Is the voltage within the specified range?

10 -15  volts

Go to Step 21

Go to Step 18

18

Replace the TRK relay.

Does the system operate properly?

--

Fuel Filler Door Release System Check

Go to Step 7

19

Measure the voltage of terminal C9, connector C2 of the rear junction block.

Is the voltage within the specified range?

10 -15  volts

Go to Step 20

Go to Step 18

20

Repair the open or high resistance in circuit 1344.

Is the repair complete?

--

Fuel Filler Door Release System Check

--

21

Measure the voltage at terminal A of the rear compartment lid release solenoid harness connector.

Is the voltage within the specified range?

10 -15  volts

Go to Step 23

Go to Step 22

22

Repair the open in CKT 56.

Is the repair complete?

--

Fuel Filler Door Release System Check

--

23

Inspect ground circuit 850 for an open.

Was an open found?

--

Go to Step 24

Go to Step 25

24

Repair circuit 850.

Is the repair complete?

--

Fuel Filler Door Release System Check

--

25

Replace the rear compartment lid release solenoid.

Is the repair complete?

--

Fuel Filler Door Release System Check

--

26

  1. Connect a scan tool to the Data Link Connector (DLC).
  2. Use the Instrument Panel Integration Module (IPM) data display at the non-HVAC data screen to observe the state of the trunk release switch input.

Is the input ON when the trunk button is pressed and OFF when released?

--

Go to Step 27

Go to Step 28

27

Replace the IPM.

Is the repair complete?

--

Fuel Filler Door Release System Check

--

28

  1. Disconnect the rear compartment lid release switch connector.
  2. Measure the resistance between switch harness connector terminal 4 and ground.

Is the resistance within the specified range?

0-3 ohms

Go to Step 30

Go to Step 29

29

Repair the open/high resistance in circuit 351.

Is the repair complete?

--

Fuel Filler Door Release System Check

--

30

Use a fused jumper in order to jumper terminal 5 of the switch harness connector to ground.

Did the fuel door open?

--

Go to Step 31

Go to Step 32

31

  1. Inspect the rear compartment lid release switch connector for poor contact.
  2. If OK, replace the switch.

Is the repair complete?

--

Fuel Filler Door Release System Check

--

32

Measure the voltage at terminal 5 of the switch connector to ground.

Is the voltage within the specified range?

10 -15  volts

Go to Step 33

Go to Step 34

33

Replace the switch.

Is the repair complete?

--

Fuel Filler Door Release System Check

--

34

Measure the voltage between ground and terminal D6 of connector C1 at the IPM.

Is the voltage within the specified range?

10 -15  volts

Go to Step 35

Go to Step 36

35

Repair the open in circuit 1447.

Is the repair complete?

--

Fuel Filler Door Release System Check

--

36

Replace the IPM.

Is the repair complete?

--

Fuel Filler Door Release System Check

--