For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the Rear Compartment Lid Release System Check? | -- | Go to Step 2 | Go to Rear Compartment Lid Release System Check
2 |

1. Place the gear selector lever in the PARK position.
2. Place the valet switch in the UNLOCK position.
3. Remove the rear compartment lid release relay.
4. Measure the voltage between the rear compartment lid release relay terminal 86,30 and ground.

• | Relay connector terminal 86 and ground

• | Relay connector terminal 30 and ground

Is the voltage within the specified range?

10-15V

Go to Step 4

Go to Step 3

3 |

1. Check fuse 2 in the RH IP fuse block for an open.
2. Repair the open or a short to ground in CKT 1540 (ORN).

Is the repair complete?

--

Go to Step 25

--

4 |

1. Connect a DMM between the rear compartment lid release relay connector terminals 86 and 85.
2. Place the valet switch in the ON position.
3. Press the rear compartment release switch.

Is the measured voltage in the specified range?

10-15V

Go to Step 5

Go to Step 12

5 |

1. Close the rear compartment lid.
2. Momentarily connect a fused jumper across rear compartment lid release relay connector terminals 30 and 87.

Does the rear compartment lid open?

--

Go to Step 6

Go to Step 7

6 |

1. Check the rear compartment lid release relay for poor terminal contact.
2. If OK, replace the rear compartment lid release relay.

Is the repair complete?

--

Go to Step 25

--

7 |

1. Disconnect the rear compartment lid release actuator.
2. Connect a fused jumper across rear compartment lid release relay connector terminals 30 and 87.
3. Connect a DMM between rear compartment lid release actuator connector terminal A and ground.

Is the measured voltage in the specified range?

10-15V

Go to Step 9

Go to Step 8

8 | Repair the open in CKT 56 (BLK/WHT) for an open. Is the repair complete? | -- | Go to Step 25 | --
9 | Connect a DMM between rear compartment lid release actuator connector terminals A and B. Is the measured voltage in the specified range? | 10-15V | Go to Step 11 | Go to Step 10
10 | Repair the open in CKT 1350 (BLK). Is the repair complete? | -- | Go to Step 25 | --
11 |

1. Check the rear compartment lid release actuator connector for poor terminal contact.
2. If OK, replace the rear compartment lid release actuator. Refer to Release Actuator Replacement .

Is the repair complete?

--

Go to Step 25

--

12 |

1. Disconnect the valet switch.

Connect a fused jumper between relay connector terminals 86 and 85.

2. Connect a DMM between valet switch connector terminal A and ground.

Is the measured voltage in the specified range?

10-15V

Go to Step 14

Go to Step 13

13 | Repair the open in CKT 1344 (LT BLU). Is the repair complete? | -- | Go to Step 25 | --
14 |

1. Connect a DMM between valet switch connector terminals A and B.
2. Press the rear compartment lid release switch.

Is the measured voltage in the specified range?

10-15V

Go to Step 15

Go to Step 16

15 |

• | Check the valet switch connector for poor terminal contact.

• | If OK, replace the valet switch. Refer to Rear Compartment Lid Valet Lock Out Switch Replacement .

Is the repair complete?

--

Go to Step 25

--

16 |

1. Disconnect the rear compartment lid release switch connector.
2. Connect the valet switch.
3. Place the valet switch in the UNLOCK (ON) position.
4. On Pontiac vehicles, connect a DMM between release switch connector terminal B and ground.
5. On Buick vehicles, connect a DMM between release switch connector terminal C and ground.
6. On Oldsmobile vehicles, connect a DMM between release switch connector terminal D and ground.

Is the measured voltage in the specified range?

10-15V

Go to Step 18

Go to Step 17

17 | Repair the open in CKT 1576 (BLK). Is the repair complete? | -- | Go to Step 25 | --
18 |

• | On Pontiac vehicles, connect a DMM between rear compartment lid release switch connector terminals B and A.

• | On Buick vehicles, connect a DMM between rear compartment lid release switch connector terminals C and A.

• | On Oldsmobile vehicles, connect a DMM between rear compartment lid release switch connector terminal D and C.

Is the measured voltage in the specified range?

10-15V

Go to Step 19

Go to Step 20

19 |

1. Check the rear compartment release switch for poor terminal contact.
2. If OK, replace the rear compartment release switch. Refer to Rear Compartment Switch Replacement .

Is the repair complete?

--

Go to Step 25

--

20 |

1. Disconnect the park/neutral position (PNP) switch connector.

• | On Pontiac vehicles, connect a fused jumper between rear compartment lid release switch connector terminals B and A.

• | On Buick vehicles, connect a fused jumper between release switch connector terminals C and A.

• | On Oldsmobile vehicles, connect a fused jumper between release switch connector terminals D and C.

2. Connect a DMM between PNP switch connector terminal A and ground.

Is the measured voltage in the specified range?

10-15V

Go to Step 22

Go to Step 21

21 | Repair the open in CKT 434 (ORN). Is the repair complete? | -- | Go to Step 25 | --
22 | Connect a DMM between the park/neutral position (PNP) switch connector terminals A and D. Is the measured voltage in the specified range? | 10-15V | Go to Step 24 | Go to Step 23
23 |

1. Check for proper terminal contact at ground G101.
2. If OK, repair the open in CKT 451.

Is the repair complete?

--

Go to Step 25

--

24 |

1. Test for proper terminal contact at the park/neutral position (PNP) switch connector.
2. If OK, replace the PNP switch. Refer to Park/Neutral Position Switch Replacement

Is the repair complete?

--

Go to Step 25

--

25 |

1. Make sure any components removed during diagnosis are installed in place and that all connectors are connected.
2. Repeat the system check. Refer to Rear Compartment Lid Release System Check

Is the system check complete?

--

System OK

--