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For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2004 🢒 Seville 🢒 Brakes 🢒 Park Brake 🢒 Park Brake Will Not Release

Park Brake Will Not Release w/RHD

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. Tests the park brake switch signal circuit. An open in the park brake switch of the park brake signal circuit will prevent release of the park brake and illumination of the red Brake warning indicator.

    2.

  2. Listen for an audible click when the park brake relay A operates. Command both the ON and OFF states. Repeat the commands as necessary.

    3.

  3. Listen for an audible click when the park brake relay B operates. Command both the ON and OFF states. Repeat the commands as necessary.

    4.

  4. Tests for voltage at the coil side of the park brake relay A.

    5.

  5. Tests for voltage at the coil side of the park brake relay B.

    6.

  6. Verifies that the RIM is providing ground to the park brake relay A.

    7.

  7. Verifies that the RIM is providing ground to the park brake relay B.

    8.

  8. Tests for voltage at the switch side of the park brake relay A. The PRK BRK fuse supplies power to the switch side of the park brake relay A.

    9.

  9. Tests for voltage at the switch side of the park brake relay B. The PRK BRK fuse supplies power to the switch side of the park brake relay B.

Step

Action

Yes

No

Schematic Reference: Park Brake System Schematics

1

Did you perform the Park Brake Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Park Brake

2

  1. Turn ON the ignition, with the engine OFF.
  2. Set the park brake.
  3. Observe the red Brake warning indicator.

Did the red Brake warning indicator remain illuminated?

Go to Step 3

Go to Brake Warning Indicator Inoperative in Hydraulic Brakes

3

  1. Turn OFF the ignition.
  2. Install a scan tool.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, command the park brake relay A ON and OFF.

Does the park brake relay A turn ON and OFF with each command?

Go to Step 4

Go to Step 5

4

With a scan tool, command the park brake relay B ON and OFF.

Does the park brake relay B turn ON and OFF with each command?

Go to Step 9

Go to Step 6

5

  1. Turn OFF the ignition.
  2. Disconnect the park brake relay A.
  3. Turn ON the ignition, with the engine OFF.
  4. Probe the coil side battery positive voltage circuit of the park brake relay A with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 7

Go to Step 17

6

  1. Turn OFF the ignition.
  2. Disconnect the park brake relay B.
  3. Turn ON the ignition, with the engine OFF.
  4. Probe the coil side battery positive voltage circuit of the park brake relay B with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 8

Go to Step 17

7

  1. Connect a test lamp between the control circuit of the park brake relay A and the coil side battery positive voltage circuit of the park brake relay A.
  2. With a scan tool, command the park brake relay A ON and OFF .

Does the test lamp turn ON and OFF with each command?

Go to Step 24

Go to Step 15

8

  1. Connect a test lamp between the control circuit of the park brake relay B and the coil side battery positive voltage circuit of the park brake relay B.
  2. With a scan tool, command the park brake relay B ON and OFF .

Does the test lamp turn ON and OFF with each command?

Go to Step 25

Go to Step 16

9

Probe the switch side battery positive voltage circuit of the park brake relay A with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 10

Go to Step 17

10

Connect a 3 amp fused jumper between the supply voltage circuit of the park brake relay A and the switch side battery positive voltage circuit of the park brake relay A.

Does the park brake release?

Go to Step 24

Go to Step 11

11

Test the supply voltage circuit of the park brake relay A for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 28

Go to Step 12

12

Probe the switch side battery positive voltage circuit of the park brake relay B with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

Go to Step 13

Go to Step 17

13

Connect a 3 amp fused jumper between the supply voltage circuit of the park brake relay B and the switch side battery positive voltage circuit of the park brake relay B.

Does the park brake release?

Go to Step 25

Go to Step 14

14

Test the supply voltage circuit of the park brake relay B for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 28

Go to Step 18

15

Test the control circuit of the park brake relay A for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 28

Go to Step 19

16

Test the control circuit of the park brake relay B for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 28

Go to Step 19

17

Inspect for poor connections at the harness connector of the rear fuse block. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 28

Go to Step 23

18

Inspect for poor connections at the harness connector of the park brake release solenoid. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 28

Go to Step 20

19

Inspect for poor connections at the harness connector of the rear integration module (RIM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 28

Go to Step 27

20

Inspect the park brake system for proper operation. Refer to Park Brake System Diagnosis .

Did you find and correct the condition?

Go to Step 28

Go to Step 21

21

Inspect the disc brake system for proper operation. Refer to Disc Brake System Diagnosis in Hydraulic Brakes.

Did you find and correct the condition?

Go to Step 28

Go to Step 22

22

Inspect the hydraulic brake system for proper operation. Refer to Hydraulic Brake System Diagnosis in Hydraulic Brakes.

Did you find and correct the condition?

Go to Step 28

Go to Step 26

23

Replace the rear fuse block. Refer to Rear Electrical Center or Junction Block Replacement in Wiring Systems.

Did you complete the replacement?

Go to Step 28

--

24

Replace the park brake relay A.

Did you complete the replacement?

Go to Step 28

--

25

Replace the park brake relay B.

Did you complete the replacement?

Go to Step 28

--

26

Replace the park brake release solenoid. Refer to Park Brake Release Solenoid Replacement .

Did you complete the replacement?

Go to Step 28

--

27

Replace the rear integration module (RIM). Refer to Rear Integration Body Control Module Replacement in Body Control System.

Did you complete the replacement?

Go to Step 28

--

28

Operate the system in order to verify the repair.

Did you correct the condition?

Go to Step 2

System OK