GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2000 🢒 Escalade 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Low and High Beams Headlamps Inoperative

Low and High Beams Headlamps Inoperative Headlamps

Step

Action

Value(s)

Yes

No

1

Did you perform the Headlights System Check?

--

Go to Step 2

Go to Headlight System Check

2
  1. Disconnect connector C266.
  2. Connect a DMM, set on ohms, between connector C266, cavity E13 for CKT 10 (YEL), and cavity E12 for CKT 12 (TAN).
  3. Operate the headlamp switch at least twice.

Is there continuity?

--

Go to Step 3

Go to Step 5

3
  1. Disconnect the headlamp switch connector.
  2. Connect a DMM between C266, cavity E13, and the headlamp and panel dimmer switch connector, cavity G for CKT 10 (YEL).

Is there continuity?

--

Go to Step 4

Go to Step 6

4

Connect a test lamp between the headlamp and panel dimmer switch connector, cavity C for CKT 42 (RED), and ground.

Does the test lamp light?

--

Go to Step 7

Go to Step 8

5

Repair an open in CKT 10 (YEL) or in CKT 12 (TAN) in the steering column. Refer to Wiring Repairs in Wiring Systems.

Did you find and repair the condition?

--

Go to Headlight System Check

Go to Step 7

6

Repair the open in CKT 10 (YEL) between the headlamp and panel dimmer switch and connector C266. Refer to Wiring Repairs in Wiring Systems.

Did you find and repair the condition?

--

Go to Headlight System Check

--

7

Replace the headlamp switch. Refer to Headlamp Switch Replacement .

Is the repair complete?

--

Go to Headlight System Check

--

8

Repair the open in CKT 42 (RED) between the underhood fuse-relay center and the headlamp and panel dimmer switch. Refer to Wiring Repairs in Wiring Systems.

Did you find and repair the condition?

--

Go to Headlight System Check

--

Low and High Beams Headlamps Inoperative DRL

Step

Action

Value(s)

Yes

No

1

Did you perform the Headlights System Check?

--

Go to Step 2

Go to Headlight System Check

2
  1. Turn the headlamp switch to the ON position.
  2. Backprobe the headlamp and panel dimmer switch connector with a test lamp from cavity G to ground.

Does the test lamp light?

--

Go to Step 3

Go to Step 4

3
  1. Disconnect the headlamp dimmer switch connector.
  2. Connect a test lamp from the headlamp dimmer switch connector, cavity D, to ground.

Does the test lamp light?

--

Go to Step 5

Go to Step 6

4

Replace the headlamp and panel dimmer switch. Refer to Multifunction, Turn Signal, and Hazard Switch Replacement - On Vehicle .

Is the repair complete?

--

Go to Headlight System Check

--

5

Replace the headlamp dimmer switch. Refer to Multifunction, Turn Signal, and Hazard Switch Replacement - On Vehicle .

Is the repair complete?

--

Go to Headlight System Check

--

6

Repair the open in CKT 10 (YEL) between the headlamp and panel dimmer switch. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Headlight System Check

--