GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

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

--

Go to Step 2

Go to Symptoms - Hydraulic Brakes

2

  1. Turn the ignition to the RUN position.
  2. Set the park brake.

Does the brake warning indicator illuminate?

--

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

Go to Step 3

3

Did the brake warning indicator illuminate for the bulb test and then turn off?

--

Go to Step 4

Go to Step 10

4

  1. Disconnect the brake fluid level indicator sensor.
  2. Connect a 10A fused jumper from the brake fluid level indicator sensor connector terminal A to terminal B. Refer to Circuit Testing in Wiring Systems.
  3. Turn the ignition switch to the RUN position.

Is the brake warning indicator on?

--

Go to Step 5

Go to Step 7

5

Test for and repair a poor connection at the brake fluid level indicator sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and repair a poor connection?

--

Go to Step 23

Go to Step 6

6

Replace the brake fluid level indicator sensor. Refer to Brake Fluid Level Indicator Switch Replacement .

Did you complete the replacement?

--

Go to Step 23

--

7

  1. Connect a 10A fused jumper from the brake fluid level indicator sensor terminal A to ground. Refer to Circuit Testing in Wiring Systems.
  2. Turn the ignition switch to the RUN position.

Is the brake warning indicator on?

--

Go to Step 8

Go to Step 9

8

Repair the open in circuit 150 between the brake fluid level indicator sensor terminal B and S155. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 23

--

9

Repair the open or poor connection in circuit 33 between the brake fluid level indicator sensor terminal A and S228. Refer to Wiring Repairs or Connector Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 23

--

10

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

Did you complete the replacement?

--

Go to Step 23

--

11

  1. Disconnect the park brake switch connector.
  2. Connect a 10A fused jumper from the park brake switch connector to ground. Refer to Circuit Testing in Wiring Systems.
  3. Turn the ignition switch to the RUN position.

Is the brake warning indicator on?

--

Go to Step 12

Go to Step 15

12

Test for and repair a poor connection at the park brake switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and repair a poor connection?

--

Go to Step 23

Go to Step 13

13

Test and repair a poor connection at the park brake switch ground. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and repair a poor connection?

--

Go to Step 23

Go to Step 14

14

Replace the park brake switch.

Did you complete the replacement?

--

Go to Step 23

--

15

Determine if this vehicle is either of the following types:

    • Domestic
    • Gulf States

Is the vehicle one of the above types?

--

Go to Step 16

Go to Step 19

16

  1. Leave the 10A fused jumper connected between the park brake switch connector and ground.
  2. Disconnect the daytime running lights (DRL) module connector C2.
  3. Connect a fused jumper between the DRL module connector C2 terminal D and terminal E. Refer to Circuit Testing in Wiring Systems.
  4. Turn the ignition switch to the RUN position.

Is the brake warning indicator on?

--

Go to Step 21

Go to Step 17

17

  1. Connect a 10A fused jumper from the DRL module connector C2 terminal D to the ground. Refer to Circuit Testing in Wiring Systems.
  2. Turn the ignition switch to the RUN position.
  3. Is the brake warning indicator on?

--

Go to Step 18

Go to Step 19

18

Repair the open in circuit 1134 between the DRL module connector C2 terminal E and the park brake switch. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 23

--

19

Test for and repair a poor connection at the instrument cluster connector terminal A5. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and repair a poor connection?

--

Go to Step 23

Go to Step 20

20

Repair the open in circuit 33 between the instrument cluster connector terminal A5 and the DRL module connector C2 terminal D (Domestic or Gulf States) or the park brake switch (Europe or Japan). Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 23

--

21

Test for and repair a poor connection at the DRL module connector C2 terminal D and terminal E. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and repair a poor connection?

--

Go to Step 23

Go to Step 22

22

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

Did you complete the replacement?

--

Go to Step 23

--

23

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3