GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1998 🢒 Corvette 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Headlamp Doors Inoperative - One Door

Headlamp Door Inoperative, One Side

Step

Action

Value(s)

Yes

No

1

Were you sent here from the Headlight Door System Check?

--

Go to Step 2

Go to Headlight Door System Check

2
  1. Disconnect the inoperative (left/right) headlamp connector.
  2. Connect a DMM between the headlamp connector terminal A and terminal B.
  3. Turn the headlamp switch to the ON and then the OFF position.
  4. Measure the voltage at the DMM in both of the headlight switch positions.

Is the voltage within the specified values?

10.0-14.0V

Go to Step 11

Go to Step 3

3
  1. Disconnect the headlamp opening door actuator control module connector C2.
  2. Connect the positive lead of the DMM at the inoperative headlamp connector terminal B.
  3. Connect the negative lead of the DMM at the headlamp opening door actuator control module connector terminal:
    4. • Left Side = terminal A
    • Right Side = terminal D
  4. Measure either of the following circuits for continuity between the headlamp connector and the headlamp opening door actuator control module connector.
    5. • Left Side = CKT 576
    • Right Side = CKT 578

Is the relative circuit continuous between these two terminals?

--

Go to Step 4

Go to Step 7

4
  1. Connect the positive lead of the DMM at the inoperative headlamp connector terminal A.
  2. Connect the negative lead of the DMM at the headlamp opening door actuator control module connector terminal:
    3. • Left Side = terminal B
    • Right Side = terminal C
  3. Measure either of the following circuits for continuity between the headlamp connector and the headlamp opening door actuator control module connector.
    4. • Left Side = CKT 577
    • Right Side = CKT 579

Is the relative circuit continuous between these two terminals?

--

Go to Step 5

Go to Step 8

5
  1. Connect the positive lead of the DMM at the inoperative headlamp connector terminal B.
  2. Connect the negative lead of the DMM to ground.
  3. Measure either of the following circuits for continuity to ground.
    4. • Left Side = CKT 576
    • Right Side = CKT 578

Is the relative circuit shorted to ground?

--

Go to Step 9

Go to Step 6

6
  1. Connect the positive lead of the DMM at the inoperative headlamp connector terminal A.
  2. Connect the negative lead of the DMM to ground.
  3. Measure either of the following circuits for continuity to ground.
    4. • Left Side = CKT 577
    • Right Side = CKT 579

Is the relative circuit shorted to ground?

--

Go to Step 10

Go to Step 12

7

Repair a poor connection or an open in the circuit relative to the inoperative headlamp door.

    • Left Side = CKT 576
    • Right Side = CKT 578

Is the repair completed?

--

Go to Headlight Door System Check

--

8

Repair a poor connection or an open in the circuit relative to the inoperative headlamp door.

    • Left Side = CKT 577
    • Right Side = CKT 579

Is the repair completed?

--

Go to Headlight Door System Check

--

9

Repair a short to ground in the circuit relative to the inoperative headlamp door.

    • Left Side = CKT 576
    • Right Side = CKT 578

Is the repair completed?

--

Go to Headlight Door System Check

--

10

Repair a short to ground in the circuit relative to the inoperative headlamp door.

    • Left Side = CKT 577
    • Right Side = CKT 579

Is the repair completed?

--

Go to Headlight Door System Check

--

11

Replace the inoperative headlamp opening door assembly.

Is the repair complete?

--

Go to Headlight Door System Check

--

12

Replace the headlamp opening door actuator control module.

Is the repair complete?

--

Go to Headlight Door System Check

--