GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2001 🢒 Century 🢒 Body and Accessories 🢒 Lighting Systems 🢒 Stop Lamps Inoperative

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

1

Did you perform the Lighting System Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Lighting Systems

2

Press the brake pedal.

Do all of the stop lamps illuminate?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

Are all the stop lamp inoperative?

Go to Step 4

Go to Step 7

4

Inspect the STOP LAMP fuse.

Is the fuse open?

Go to Step 19

Go to Step 5

5
  1. Disconnect the stop lamp switch.
  2. Probe the battery supply voltage circuit of the stoplamp switch connector with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 6

Go to Step 18

6

Install a fused jumper between the battery supply voltage circuit and the stop lamp switch signal circuit of the stop lamp switch connector.

Do the stop lamps illuminate?

Go to Step 17

Go to Step 23

7

Determine if the center high mounted stop lamp is inoperative or the stop/turn lamps are inoperative.

Are the stop/turn lamps inoperative?

Go to Step 8

Go to Step 11

8

Are both of the stop/turn signals inoperative?

Go to Step 13

Go to Step 9

9
  1. Remove the inoperative stop/turn lamp bulb.
  2. Press the brake pedal.
  3. Probe the stop lamp switch signal circuit of the inoperative stop/turn lamp with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 10

Go to Step 14

10
  1. Press the brake pedal.
  2. Probe between the ground circuit and the stoplamp switch signal circuit of the inoperative stop/turn lamp with a test lamp.

Does the test lamp illuminate?

Go to Step 15

Go to Step 20

11
  1. Remove the inoperative center high mounted stop lamp bulb.
  2. Press the brake pedal.
  3. Probe the stop lamp switch signal circuit of the inoperative center high mounted stop lamp with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 12

Go to Step 21

12
  1. Press the brake pedal.
  2. Probe between the ground circuit and the stoplamp switch signal circuit of the inoperative center high mounted stop lamp with a test lamp.

Does the test lamp illuminate?

Go to Step 15

Go to Step 22

13
  1. Press the brake pedal.
  2. Backprobe the stop lamp switch signal circuit of connector C201 with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 16

Go to Step 24

14

Test for an open or high resistance in the stop lamp supply voltage circuit of the inoperative stop/turn lamp. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 28

Go to Step 16

15

Inspect for poor connections at the harness connector of the inoperative stop lamp. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 28

Go to Step 25

16

Inspect for poor connections at the harness connector of the turn signal switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 28

Go to Step 26

17

Inspect for poor connections at the harness connector of the stop lamp switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 28

Go to Step 27

18

Repair a open or high resistance in the battery supply voltage circuit of the stop lamp switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 28

--

19

Repair a short to ground in one of the following circuits:

    • The battery supply voltage circuit of the stop lamp switch
    • The stoplamp switch signal circuit of the stop lamp switch
    • The brake lamp supply voltage circuits of the turn signal switch

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 28

--

20

Repair a open or high resistance in the ground circuit of the inoperative stop/turn lamp. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 28

--

21

Repair a open or high resistance in the stop lamp switch signal circuit of the inoperative center high mounted stop lamp. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 28

--

22

Repair an open or high resistance in the ground circuit of the center high mounted stop lamp. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 28

--

23

Repair an open or high resistance in the stop lamp switch signal circuit of the stoplamp switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 28

--

24

Repair an open or high resistance in the stop lamp switch signal circuit of the turn signal switch. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 28

--

25

Replace the inoperative stop lamp. Refer to Tail Lamp Assembly and /or Backup, Sidemarker, Stop, Turn Signal Bulb Replacement or High Mount Stop Lamp Bulb Replacement .

Did you complete the repair?

Go to Step 28

--

26

Replace the turn signal switch. Refer to Turn Signal and Multifunction Switch Assembly - Disassemble - Off Vehicle in Steering Wheel and Column-Tilt.

Is the repair complete?

Go to Step 28

--

27

Adjust or replace the stop lamp switch. Refer to Stop Lamp Switch Replacement in Hydraulic Brakes.

Did you complete the repair?

Go to Step 28

--

28

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2