GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

DEFINITION: This table diagnoses inoperative courtesy lamps when a door or doors are opened. It assumes that the courtesy lamps operate properly with the interior lamp switch and keyless entry.

1

Was the entire Interior Lights System Check performed?

--

Go to Step 2

Go to Interior Lamps System Check

2

Are the courtesy lamps inoperative when all doors are open?

--

Go to Step 7

Go to Step 3

3

  1. Disconnect the suspect door lock actuator connector.
  2. Connect a fused jumper between the appropriate door lock actuator connector cavities:
  3. • LH front: cavities A (TAN) and D (BLK/WHT)
    • RH front: cavities D (DK BLU) and A (BLK/WHT).
    • LH rear: cavities A (DK BLU) and D (TAN/WHT).
    • RH rear: cavities D (DK BLU) and A (BLK/WHT).

Do the appropriate courtesy lights turn on?

--

Go to Step 8

Go to Step 4

4

  1. Disconnect the suspect door module connector C2.
  2. Connect a DMM from the appropriate door module connector C2 cavity to the appropriate door lock actuator connector cavity:
  3. • LH front: cavity C (TAN) to cavity A (TAN)
    • RH front: cavity C (DK BLU) to cavity D (DK BLU)
    • LH rear: cavity C (DK BLU) to cavity A (DK BLU)
    • RH rear: cavity C (DK BLU) to cavity D (DK BLU)

Is the resistance less than the specified value?

5 ohms

Go to Step 5

Go to Step 9

5

Connect a DMM from the appropriate door module connector C2 cavity to the appropriate door lock actuator connector cavity:

    • LH front: cavity J (BLK/WHT) to cavity D (BLK/WHT)
    • RH front: cavity A (BLK/WHT) to cavity A (BLK/WHT)
    • LH rear: cavity A (TAN/WHT) to cavity D (TAN/WHT)
    • RH rear: cavity A (BLK/WHT) to cavity A (BLK/WHT)

Is the resistance less than the specified value?

5 ohms

Go to Step 6

Go to Step 10

6

Replace the suspect door module. Refer to Door Control Module Replacement in Doors.

Is the door module replacement complete?

--

Go to Interior Lamps System Check

--

7

Replace the LH front door module (LFDM). Refer to Door Control Module Replacement in Doors.

Is the LFDM replacement complete?

--

Go to Interior Lamps System Check

--

8

Replace the suspect door lock actuator. Refer to Front Side Door Latch Replacement or Rear Side Door Latch Replacement in Doors.

Is the door lock actuator replacement complete?

--

Go to Interior Lamps System Check

--

9

Repair the open in the appropriate circuit between the door module and the door lock actuator:

    • LH front: CKT 126 (TAN)
    • RH front: CKT 49 (DK BLU)
    • LH rear: CKT 49 (DK BLU)
    • RH rear: CKT 49 (DK BLU)

Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

--

Go to Interior Lamps System Check

--

10

Repair the open in the appropriate circuit between the door module and the door lock actuator:

    • LH front: CKT 351 (BLK/WHT)
    • RH front: CKT 451 (BLK/WHT)
    • LH rear: CKT 551 (TAN/WHT)
    • RH rear: CKT 451 (BLK/WHT)

Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

--

Go to Interior Lamps System Check

--