GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

Important: 

   • Check for ABS diagnostic trouble codes prior to performing this diagnosis. Refer to Diagnostic System Check - ABS .
   • Check the brake fluid level prior to performing this diagnosis. Refer to Master Cylinder Reservoir Filling .

1

Did you review the system operation and perform the necessary inspections?

--

Go to Step 2

Go to Symptoms - Hydraulic Brakes

2

Turn the ignition to the RUN position.

Does the brake warning indicator illuminate during the bulb test and then turn off?

--

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

Go to Step 3

3

  1. Disconnect the brake fluid level indicator sensor.
  2. Turn the ignition switch to the RUN position.

Is the brake warning indicator still on?

--

Go to Step 4

Go to Step 9

4

  1. Disconnect the park brake switch.
  2. Turn the ignition switch to the RUN position.

Is the brake warning indicator still on?

--

Go to Step 5

Go to Step 10

5

Determine if this vehicle is either of the following types:

    • Domestic
    • Gulf States

Is the vehicle one of the above types?

--

Go to Step 6

Go to Step 7

6

  1. Disconnect the daytime running lights (DRL) module.
  2. Turn the ignition switch to the RUN position.

Is the brake warning indicator on?

--

Go to Step 7

Go to Step 11

7

Test for and repair a short to ground in circuit 33. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and repair a short?

--

Go to Step 13

Go to Step 8

8

Replace the instrument cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gauges, and Console.

Did you complete the replacement?

--

Go to Step 13

--

9

Replace the brake fluid level indicator sensor.

Did you complete the replacement?

--

Go to Step 13

--

10

Replace the park brake switch.

Did you complete the replacement?

--

Go to Step 13

--

11

Test for and repair a short to ground in circuit 1134. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and repair a short?

--

Go to Step 13

Go to Step 12

12

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

Did you complete the replacement?

--

Go to Step 13

--

13

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3