GM Service Manual Online
For 1990-2009 cars only

Brake Warning Inop w/low brake Fluid

Step

Action

Value(s)

Yes

No

DEFINITION: Brake warning indicator will not illuminate with the ignition switch turned ON and the brake fluid level below normal.

1

Where you sent here from the Brake Warning Diagnostic System Check?

Go to Step 2

Go to Brake Warning Indicator System Check

2

Check the CSTR MiniFuse® #19.

Is the fuse open?

Go to Step 3

Go to Step 5

3

  1. Remove the blown fuse.
  2. Disconnect the instrument cluster connector.
  3. Using a DMM, measure the resistance from the Instrument Cluster connector terminal A13 to ground.

Is the resistance infinite?

Go to Step 11

Go to Step 4

4

Repair the short to ground in CKT 139.

Is the repair complete?

Go to Brake Warning Indicator System Check

5

  1. Disconnect the Brake Fluid Level switch connector.
  2. Connect a jumper wire between the Brake Fluid Level switch connector terminal A and terminal B.
  3. Turn the ignition switch to ON.

Is the Brake Warning Indicator ON?

Go to Step 6

Go to Step 7

6

Replace the Brake Fluid Level switch.

Is the repair complete?

Go to Brake Warning Indicator System Check

7

Using a DMM, check for continuity between the Brake Fluid Level switch connector terminal B and a good ground.

Is CKT 150 continuous to ground?

Go to Step 9

Go to Step 8

8

Repair the open in CKT 150 between G101 and the Brake Fluid Level switch connector.

Is the repair complete?

Go to Brake Warning Indicator System Check

9

  1. Disconnect the Instrument Cluster connector.
  2. Using a DMM, check for continuity between the Brake Fluid Level switch connector terminal A and the Instrument Cluster connector terminal B4.

Is the CKT 333 continuous between these connectors?

Go to Step 11

Go to Step 10

10

Repair the open in CKT 33.

Is the repair complete?

Go to Brake Warning Indicator System Check

11

Replace the Instrument Cluster.

Is the repair complete?

Go to Brake Warning Indicator System Check