GM Service Manual Online
For 1990-2009 cars only

Stop Lamps Inoperative Domestic

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

Connector End View Reference: Lighting Systems Connector End Views

1

Did you review the Exterior Lighting Systems Description and Operation and perform the necessary inspections?

Go to Step 2

Go to Exterior Lighting Systems Description and Operation

2

Verify that the stop lamps are inoperative.

Do the stop lamps operate normally?

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

Go to Step 3

3

Is only one lamp inoperative?

Go to Step 4

Go to Step 5

4

Inspect the inoperative lamp for an open filament, poor terminal contact or inoperative LED.

Was a problem found?

Go to Step 11

Go to Step 8

5

Inspect the STOP/HAZ fuse in the IP fuse block.

Is the fuse open?

Go to Step 9

Go to Step 6

6

  1. Remove the stop lamp switch and install a fused jumper between the connector terminal A and terminal B.
  2. Connect a test lamp from ground to either rear turn signal switch signal circuit terminal at connector C201. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

Go to Step 12

Go to Step 7

7

Test for an open or high resistance in the stop lamp switch signal circuit or battery positive voltage circuit. Refer to Circuit Testing in Wiring Systems.

Was a problem found?

Go to Step 10

Go to Step 13

8

Repair the open or high resistance in one of the following circuits. Refer to Wiring Repairs in Wiring Systems.

    • Stoplamp switch signal
    • Left rear turn signal lamp supply voltage
    • Right rear turn signal lamp supply voltage
    • Ground

Did you complete the repair?

Go to Step 14

--

9

Repair the short to ground in one of the following circuits. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

    • Battery positive voltage
    • Stop lamp switch signal
    • Left rear turn signal supply voltage
    • Right rear turn signal supply voltage

Did you complete the repair?

Go to Step 14

--

10

Repair the open or high resistance in the stop lamp switch signal circuit or battery positive voltage circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 14

--

11

Replace the inoperative bulb/socket or high mount stop lamp assembly. Refer to High Mount Stop Lamp Replacement .

Did you complete the repair?

Go to Step 14

--

12

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

Did you complete the repair?

Go to Step 14

--

13

Replace the multifunction turn signal switch. Refer to Turn Signal Multifunction Switch Replacement in Steering Wheel and Column.

Did you complete the repair?

Go to Step 14

--

14

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3

Stop Lamps Inoperative Export

Step

Action

Yes

No

Schematic Reference: Exterior Lights Schematics

Connector End View Reference: Lighting Systems Connector End Views

1

Did you review the Exterior Lighting Systems Description and Operation and perform the necessary inspections?

Go to Step 2

Go to Exterior Lighting Systems Description and Operation

2

Verify that the stop lamps are inoperative.

Do the stop lamps operate normally?

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

Go to Step 3

3

Is only one lamp inoperative?

Go to Step 4

Go to Step 5

4

Inspect the lamp for open bulb filament, poor connector terminal contact or inoperative LED.

Was a problem found?

Go to Step 10

Go to Step 9

5

Connect a test lamp from ground to the stop lamp switch signal terminal of the inoperative lamp socket or connector and apply the service brake. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

Go to Step 7

Go to Step 6

6

Remove the stop lamp switch and install a fused jumper between the connector terminal A and terminal B.

Do the stop lamps illuminate?

Go to Step 11

Go to Step 8

7

Repair the open or high resistance in the ground circuit. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

Go to Step 12

--

8

Repair the open, high resistance or short to ground in one of the following circuits. Refer to Wiring Repairs in Wiring Systems.

    • Battery positive voltage
    • Stop lamp switch signal

Is the repair complete?

Go to Step 12

--

9

Repair the open or high resistance in one of the following circuits. Refer to Wiring Repairs in Wiring Systems.

    • Stop lamp switch signal
    • Ground

Is the repair complete?

Go to Step 12

--

10

Repair the connector or replace the inoperative bulb/high mount stop lamp assembly. Refer to High Mount Stop Lamp Replacement .

Is the repair complete?

Go to Step 12

--

11

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

Did you complete the repair?

Go to Step 12

--

12

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3