GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the Fuel Filler Door Release System Check performed?

--

Go to Step 2

Go to Fuel Filler Door Release System Check .

2

  1. Ensure the transmission is in the PARK position.
  2. Disconnect the door lock relay K135 connector.
  3. Turn the ignition switch to the ON position.
  4. Use the DMM to measure the voltage between terminal 5 of the door lock relay K135 connector and a known good ground.

Is the measured voltage within the specified value?

B+

Go to Step 4

Go to Step 3

3

  1. Locate an open or a high resistance in circuit A888 or A892.
  2. Repair the open or the high resistance in circuit A888 or A892.

Is the repair complete?

--

Go to Step 15

--

4

  1. Press and hold the fuel tank filler door lock release switch.
  2. Use the DMM to measure the resistance between terminal 1 of the door lock relay K135 connector and a known good ground.

Is the measured resistance within the specified value?

Less than 2 ohms

Go to Step 10

Go to Step 5

5

  1. Disconnect the fuel tank filler door lock release switch connector.
  2. Use the DMM to measure the resistance between terminal 2 of the fuel tank filler door lock release switch connector and a known good ground.

Is the measured resistance within the specified value?

Less than 2 ohms

Go to Step 7

Go to Step 6

6

  1. Locate an open or a high resistance in circuit B901, M940, M910, X920, and/or F950.
  2. Repair the open or the high resistance in circuits B901, M940, M910, X920, and/or F950.
  3. Replace the automatic transmission shift lock control switch if these circuits are OK.

Is the repair or replacement complete?

--

Go to Step 15

--

7

Use the DMM to measure the resistance between terminal 1 of the door lock relay K135 connector and terminal 3 of the fuel tank filler door lock release switch.

Is the measured resistance within the specified value?

Less than 2 ohms

Go to Step 9

Go to Step 8

8

  1. Locate an open or a high resistance in circuit FA811.
  2. Repair the open or the high resistance in circuit FA811.

Is the repair complete?

--

Go to Step 15

--

9

Replace the fuel tank filler door lock release switch. Refer to Fuel Door Switch Replacement in Instrument Panel, Gauges and Console.

Is the replacement complete?

--

Go to Step 15

--

10

  1. Reconnect the door lock relay K135.
  2. Disconnect the fuel tank filler door lock actuator connector.
  3. Use the DMM to measure the resistance between terminal A of the fuel tank filler door lock actuator connector and a known good ground.

Is the measured resistance within the specified value?

Less than 2 ohms

Go to Step 12

Go to Step 11

11

  1. Locate an open or a high resistance in circuit FB807.
  2. Repair the open or the high resistance in circuit FB807.

Is the repair complete?

--

Go to Step 15

--

12

  1. Press the fuel tank filler door lock release switch.
  2. Use the DMM to measure the voltage between terminal B of the fuel tank filler door lock actuator connector and a good known ground.

Is the measured voltage within the specified value?

B+

Go to Step 14

Go to Step 13

13

  1. Locate an open or a high resistance in circuit FA805.
  2. Repair the open or the high resistance in circuit FA805.
  3. If the circuit is OK, replace the door lock relay K135.

Is the repair or replacement complete?

--

Go to Step 15

--

14

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

Is the replacement complete?

--

Go to Step 15

--

15

  1. Connect all connectors and components that were disconnected.
  2. Verify that the fuel tank filler door lock release system operates properly.

Does the fuel tank filler door release system operate properly?

--

System OK

Go to Step 1