GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1999 🢒 Seville 🢒 Brakes 🢒 Hydraulic Brakes 🢒 Brake Booster Pump Inoperative

Brake Booster Pump Inoperative RH Drive

Step

Action

Value(s)

Yes

No

1

Was the entire Brake Booster Pump System Check performed?

--

Go to Step 2

Go to Brake Booster Pump System Check

2

Check the IGN 1 Fuse in the underhood junction block for an open.

Is the IGN 1 Fuse OK?

--

Go to Step 3

Go to Step 15

3

Check the EXPORT BRK Fuse in the underhood junction block for an open.

Is the EXPORT BRK Fuse OK?

--

Go to Step 4

Go to Step 16

4
  1. Disconnect the power brake booster pump relay connector.
  2. Connect a test lamp from the power brake booster pump relay connector cavity 87 (RED) to ground.

Did the test lamp light?

--

Go to Step 5

Go to Step 14

5
  1. Turn the ignition switch to the ON position.
  2. Connect a test lamp from the power brake booster pump relay connector cavity 85 (PNK) to ground.

Did the test lamp light?

--

Go to Step 6

Go to Step 17

6
  1. Turn the ignition switch to the OFF position.
  2. Disconnect the power brake booster assembly connector.
  3. Connect a test lamp from the power brake booster pump relay connector cavity 87 (RED) to the power brake booster pump assembly connector cavity B (BLK)

Did the test lamp light?

--

Go to Step 7

Go to Step 13

7

Connect a fused jumper between the power brake booster pump relay connector cavity 87 (RED) and cavity 30 (PNK).

Did the motor run?

--

Go to Step 8

Go to Step 10

8
  1. Remove the fused jumper.
  2. Reconnect the power brake booster pump relay connector.
  3. Disconnect power brake pump assembly connector.
  4. Connect a fused jumper from the power brake booster pump assembly cavity A (DK BLU) to ground.
  5. Turn the ignition switch to the ON position.

Did the motor run?

--

Go to Step 18

Go to Step 9

9
  1. Turn the ignition switch to the OFF position.
  2. Disconnect the power brake booster pump relay connector.
  3. Connect a DMM from the power brake booster pump relay connector cavity 86 (DK/BLU) to the power brake booster pump assembly cavity A (DK BLU) to ground.

Is the resistance less then specified value?

5 ohms

Go to Step 11

Go to Step 12

10
  1. Disconnect the power brake booster pump assembly connector.
  2. With the jumper still in place, connect a test lamp from the power brake booster assembly connector cavity C (PNK) to ground.

Did the test lamp light?

--

Go to Step 18

Go to Step 19

11

Replace the power brake booster pump relay. Refer to Wiring Repairs in Wiring Systems.

Is the power brake booster pump relay replacement complete?

Go to Brake Booster Pump System Check

12

Repair the open in CKT 1809 (DK BLU) between the power brake booster pump relay and the power brake booster pump assembly. Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

Go to Brake Booster Pump System Check

13

Repair the open in CKT 1550 (BLK) between the power brake booster pump assembly and G100. Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

Go to Brake Booster Pump System Check

14

Repair the open in CKT 642 (RED) between the underhood junction block and the power brake booster pump relay. Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

Go to Brake Booster Pump System Check

15

Repair the short to ground in CKT  139 (PNK). Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

Go to Step 20

16

Repair the short to ground in connector cavity  642 (RED). Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

Go to Step 21

17

Repair the open in CKT 139 (PNK) between the underhood junction block and the power brake booster pump relay. Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

Go to Brake Booster Pump System Check

18

Replace the power brake booster pump assembly.

Is the power brake booster pump replacement complete?

Go to Brake Booster Pump System Check

19

Repair the open in CKT 173 (PNK) between the power brake booster pump relay and the power brake booster pump assembly. Refer to Wiring Repairs in Wiring Systems.

Is the circuit repair complete?

Go to Brake Booster Pump System Check

20

Replace the IGN 1 fuse in the underhood junction block. Refer to Wiring Repairs in Wiring Systems.

Is the fuse replacement complete?

Go to Brake Booster Pump System Check

21

Replace the EXPORT BRK fuse in the underhood junction block.

Is the fuse replacement complete?

Go to Brake Booster Pump System Check