GM Service Manual Online
For 1990-2009 cars only

Brake Warning Indicator Inoperative Buick

ind inop-buick

Step

Action

Value(s)

Yes

No

1

Was the entire Brake Warning System Check performed?

--

Go to step 2

Go to Brake Warning System Check

2

Did the BRAKE indicator illuminate briefly during the bulb check (when the ignition switch transitions from RUN to START)?

--

Go to step 16

Go to step 3

3

  1. Disconnect the brake fluid level switch.
  2. Connect a test lamp between the brake fluid level switch harness connector terminal C and ground.
  3. Ignition switch in RUN.

Is the test lamp lit?

--

Go to step 4

Go to step 8

4

Connect the test lamp between the connector terminals C and B.

Is the test lamp lit?

--

Go to step 14

Go to step 5

5

Connect the test lamp between the connector terminal B and ground.

Is the test lamp lit?

--

Go to step 6

Go to step 7

6

Repair circuit 875 (LT GRN/BLK) for a short to positive voltage.

Is the repair complete?

--

Go to Brake Warning System Check

--

7

Repair open in circuit 875 (LT GRN/BLK).

Is the repair complete?

--

Go to Brake Warning System Check

--

8

  1. Ignition switch in OFF.
  2. Disconnect the instrument cluster connectors.
  3. Connect a fused jumper between the instrument cluster harness connector C1, terminals E15 and E16.
  4. Ignition switch in RUN.

Is the test lamp lit?

--

Go to step 15

Go to step 9

9

Connect the fused jumper between the harness connector C1, terminal E16 and battery positive voltage.

Is the test lamp lit?

--

Go to step 13

Go to step 10

10

Connect the fused jumper between the harness connector C1, terminal E16 and ground.

Is the test lamp lit?

--

Go to step 11

Go to step 12

11

Repair short to positive voltage in circuit 33 (TAN/WHT).

Is the repair complete?

--

Go to Brake Warning System Check

--

12

Repair open in circuit 875 (LT GRN/BLK).

Is the repair complete?

--

Go to Brake Warning System Check

--

13

Repair open in circuit 39 (PNK).

Is the repair complete?

--

Go to Brake Warning System Check

--

14

Replace the brake fluid level switch.

Is the repair complete?

--

Go to Brake Warning System Check

--

15

Check the instrument cluster BRAKE indicator and circuit for an open.

    • If the instrument cluster BRAKE indicator is open, replace the indicator.
    • If the instrument cluster BRAKE indicator circuit is open, replace the instrument cluster.

Is repair complete?

--

Go to Brake Warning System Check

--

16

  1. Disconnect the park brake switch.
  2. Connect a test lamp between the the park brake switch harness connector terminal A and ground.
  3. Ignition switch in RUN.

Is the test lamp lit?

--

Go to step 17

Go to step 18

17

Replace the park brake switch.

Is the repair complete?

--

Go to Brake Warning System Check

--

18

Repair open in circuit 33 (TAN/WHT).

Is the repair complete?

--

Go to Brake Warning System Check

--

Brake Warning Indicator Inoperative Oldsmobile

Step

Action

Value(s)

Yes

No

1

Did you perform the Brake Warning System Check?

--

Go to Step 2

Go to Brake Warning System Check

2

Did the PARK indicator illuminate briefly during the bulb check (when the ignition switch transitions from RUN to START)?

--

Go to Step 3

Go to Step 4

3

Did the PARK indicator illuminate when the park brake was applied?

--

Go to Step 11

Go to Step 9

4

  1. Disconnect the instrument cluster connectors.
  2. Connect a DMM between the instrument cluster harness connector C2, terminals A9 and B11.
  3. Briefly turn the ignition switch to START (do not start the engine).

Is the voltage within the specified range?

10-15V

Go to Step 20

Go to Step 5

5

Connect the DMM between the connector terminal B11 and ground.

Is the voltage within the specified range?

10-15V

Go to Step 6

Go to Step 16

6

  1. Disconnect C202.
  2. Connect the DMM between the instrument cluster harness connector C2, terminal A9 and C202 terminal B3 (body harness side).

Is the resistance less than the specified range?

5 ohms

Go to Step 7

Go to Step 8

7

Repair open in CKT 33 (TAN/WHT) between C202 and the ignition switch. If the circuit is open, test for a short to positive voltage.

Did you complete the repair?

--

Go to Brake Warning System Check

--

8

Repair open in CKT 33 (TAN/WHT) between C202 and the instrument cluster. If the circuit is open, test for a short to positive voltage.

Did you complete the repair?

--

Go to Brake Warning System Check

--

9

  1. Disconnect the park brake switch connector.
  2. Connect a DMM between the park brake switch harness connector terminal A and ground.
  3. Turn the ignition switch to the RUN position.

Is the measured voltage within the specified range?

10-15V

Go to Step 17

Go to Step 10

10

Repair open in CKT 33 (TAN/WHT) between S226 and the park brake switch. If the circuit is open, test for a short to positive voltage.

Did you complete the repair?

--

Go to Brake Warning System Check

--

11

  1. Disconnect the brake fluid level sensor.
  2. Connect a DMM between the brake fluid level sensor harness connector terminals C and B.
  3. Briefly turn the ignition switch to START (do not start the engine).

Is the measured voltage within the specified range?

10-15V

Go to Step 18

Go to Step 12

12

  1. Connect the DMM between the brake fluid level sensor harness connector terminal C and ground.
  2. Turn the ignition switch to the RUN position.

Is the measured voltage within the specified range?

10-15V

Go to Step 19

Go to Step 13

13

  1. Disconnect the remote indicator bank connector.
  2. Connect a fused jumper between the brake fluid level sensor harness connector terminal C and ground.
  3. Connect the DMM between the remote indicator bank connector terminals A1 and A3.
  4. Turn the ignition switch to the RUN position.

Is the measured voltage within the specified range?

10-15V

Go to Step 21

Go to Step 14

14

  1. Connect the DMM between the remote indicator bank connector terminals A1 and ground.
  2. Turn the ignition switch to the RUN position.

Is the measured voltage within the specified range?

10-15V

Go to Step 15

Go to Step 16

15

Repair open in CKT 33 (TAN/WHT). If the circuit is open, test for a short to positive voltage.

Did you complete the repair?

--

Go to Brake Warning System Check

--

16

Repair open in CKT 39 (PNK). If the circuit is open, test for a short to positive voltage.

Did you complete the repair?

--

Go to Brake Warning System Check

--

17

Replace the park brake switch.

Did you complete the repair?

--

Go to Brake Warning System Check

--

18

Replace the brake fluid level sensor.

Did you complete the repair?

--

Go to Brake Warning System Check

--

19

Repair open in CKT 875 (LT GRN/BLK). If the circuit is open, test for a short to positive voltage.

Did you complete the repair?

--

Go to Brake Warning System Check

--

20

Check instrument cluster PARK indicator and the circuit for an open.

Did you complete the repair?

--

Go to Brake Warning System Check

--

21

Check instrument cluster BRAKE FLUID indicator and the circuit for an open.

Did you complete the repair?

--

Go to Brake Warning System Check

--