GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

Schematic Reference: Brake Warning System Schematics

1

Did you review the Brake Warning System Discription and Operation and perform the necessary inspections?

Go to Step 2

Go to Symptoms - Hydraulic Brakes

2

Verify the Brake Warning System is inoperative.

Does the system operate normally?

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

Go to Step 3

3

Test the RED/YEL wire between the instrument cluster assembly C2 cavity 6 and the brake fluid level switch cavity 1.

Does a short to ground condition exist?

Go to Step 5

Go to Step 4

4

Replace the brake fluid level switch. Refer to Master Cylinder Reservoir Replacement .

Did you correct and repair the condition?

Go to Step 12

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5

Repair the short to ground in the RED/YEL wire. Refer to Wiring Repairs in Wiring Systems.

Did you correct and repair the condition?

Go to Step 12

Go to Step 6

6

Disconnect the parking brake switch connector.

Does the indicator cease to illuminate?

Go to Step 7

Go to Step 8

7

Replace the parking brake switch. Refer to Parking Brake Indicator Switch Replacement .

Did you correct and repair the condition?

Go to Step 12

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8

Disconnect the daytime running lamps (DRL) control module connector.

Does the indicator cease to illuminate?

Go to Step 9

Go to Step 11

9

Test the RED/BLK wire between the DRL control module connector cavity 14 and the parking brake switch for a short to ground condition.

Does a short to ground condition exist?

Go to Step 10

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

10

Repair the open or short to ground in the circuit between the DRL control module cavity 14 and the parking brake switch. Refer to Wiring Repairs in Wiring Systems.

Did you correct and repair the condition?

Go to Step 12

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11

Replace the DRL control module. Refer to Daytime Running Lights (DRL) Control Module Replacement .

Is the replacement complete?

Go to Step 12

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12

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3