GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1998 🢒 Chevy C Pickup - 2WD 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Headlamps Inoperative - High Beams

Headlamps Inoperative - High Beams Daytime Running Lamps

Step

Action

Value(s)

Yes

No

DEFINITION: This diagnostic procedure should be used only if the low beam headlamps are operating properly and the high beams are inoperative.

1

Did you perform the Headlight System Check?

--

Go to Step 2

Go to Headlight System Check

2
  1. Turn the headlamp and panel dimmer switch to the ON position.
  2. Place the headlamp dimmer switch to the HIGH position.
  3. Backprobe the headlamp dimmer switch connector with a J 35616-200 from cavity C to ground.

Does the test lamp light?

--

Go to Step 3

Go to Step 5

3
  1. Disconnect high beam headlamp connector.
  2. Connect a J 35616-200 between cavity  B (base), cavity A (quad), and ground.

Does test lamp light?

--

Go to Step 6

Go to Step 4

4

Repair the open in CKT 11 (LT GRN) between the headlamp dimmer switch and the headlamp.

Is the repair complete?

--

Go to Headlight System Check

--

5

Replace the headlamp dimmer switch.

Is the repair complete?

--

Go to Headlight System Check

--

6

Connect a J 35616-200 between headlamp connector cavity A and cavity B.

Does test lamp light?

--

Go to Step 7

Go to Step 8

7

Replace high beam headlamps.

Is the repair complete?

--

Go to Headlight System Check

--

8

Locate and repair open in CKT 150 (BLK) (LH), and CKT 250 (BLK), (RH), between headlamp connector and ground.

Is the repair complete?

--

Go to Headlight System Check

--

Headlamps Inoperative - High Beams Headlamps

Step

Action

Value(s)

Yes

No

1

Did you perform the Headlight System Check?

--

Go to Step 2

Go to Headlight System Check

2
  1. Disconnect connector C266 at the steering column.
  2. Connect a self-powered test lamp between cavity E13 for CKT 10 (YEL) and cavity E11 for CKT 11 (LT GRN) of connector C266.
  3. Operate the headlamp switch at least twice.
  4. Select the high beam position.

Does the test lamp light?

--

Go to Step 3

Go to Step 4

3

Repair the open in CKT 11 (LT GRN) between connector C266 and splice S121.

Is the repair complete?

--

Go to Headlight System Check

--

4

Repair the open in CKT 11 (LT GRN) in the steering column.

Did you find and correct a condition?

--

Go to Headlight System Check

Go to Step 5

5

If the circuit is not open, replace the headlamp switch. Refer to Headlamp Switch Replacement .

Is the repair complete?

--

Go to Headlight System Check

--