For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the Interior Lights System Check performed? | -- | Go to Step 2 | Go to Interior Lamps System Check .
2 |

1. Disconnect the rear compartment courtesy lamp switch connector.
2. Disconnect the BCM connector C2.
3. Use the DMM to measure the resistance between terminal D7 of the BCM connector C2 and terminal C1 of the rear compartment courtesy lamp switch connector.

Is the measured resistance within the specified value?

Less than 5 ohms

Go to Step 4

Go to Step 3

3 |

1. Locate an open or a high resistance in circuits XM8 and/or XM9.
2. Repair the open or the high resistance in circuits XM8 and/or XM9.

Is the repair complete?

--

Go to Step 9

--

4 |

1. Connect the BCM connector C2.
2. Connect the rear compartment courtesy lamp switch.
3. Disconnect the rear compartment courtesy lamp.
4. Use the DMM to measure the voltage between terminal C1 of the rear compartment courtesy lamp connector and a known good ground.

Is the measured voltage within the specified value?

B+

Go to Step 6

Go to Step 5

5 |

1. Locate an open or a high resistance in circuit AP811.
2. Repair the open or the high resistance in circuit AP811.

Is the repair complete?

--

Go to Step 9

--

6 | Use the DMM to measure the resistance between terminal C2 of the rear compartment courtesy lamp connector and a known good ground. Is the measured resistance within the specified value? | Less than 5 ohms | Go to Step 8 | Go to Step 7
7 |

1. Locate an open or a high resistance in circuits XP982 and/or XP1.
2. Repair the open in circuits XP982 and/or XP1.
3. If these circuits are OK, replace the rear compartment courtesy lamp switch. Refer to Rear Compartment Lid Ajar Indicator Switch Replacement in Body Rear End.

Is the repair or replacement complete?

--

Go to Step 9

--

8 | Replace the rear compartment courtesy lamp. Is the repair complete? | -- | Go to Step 9 | --
9 |

1. Connect all connectors and components that were disconnected.
2. Verify that the rear compartment courtesy lamp operates properly.

Does the rear compartment courtesy lamp operate properly?

--

Go to Interior Lamps System Check .

Go to Step 1