GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Hydraulic Brake Diagnostic System Check?

--

Go to Step 2

System OK

2

Inspect the GAUGES fuse 4 at the IP fuse block

Is the fuse functional?

--

Go to Step 4

Go to Step 3

3

  1. Locate the source of the overload.
  2. Replace the GAUGES fuse.

Is the repair complete?

--

System OK

--

4

Is the brake indicator only inoperative with the parking brake engaged?

--

Go to Step 8

Go to Step 5

5

Is the brake indicator only inoperative when the hydraulic brake system has low brake pressure in the front or rear brakes?

--

Go to Step 13

Go to Step 6

6

Is the brake indicator only inoperative with the ignition switch in crank?

--

Go to Step 22

Go to Step 7

7

Is the brake indicator completely inoperative?

--

Go to Step 28

System OK

8

  1. Disconnect the park brake warning switch connector.
  2. Turn the ignition switch to run.
  3. Connect a fused jumper from the park brake warning switch connector LT BLU (1134) cavity A wire to ground.

Does the brake indicator light?

--

Go to Step 9

Go to Step 10

9

  1. Check for improper adjustment of the park brake warning switch.
  2. If OK, replace the park brake warning switch.

Is the repair complete?

--

System OK

--

10

Check for open in LT BLU (1134) wire between the daytime running lamp module and the park brake warning switch.

Does an open exist?

--

Go to Step 11

Go to Step 12

11

Repair open in LT BLU (1134) wire between daytime running lamp module and park brake warning switch.

Is the repair complete?

--

System OK

--

12

Replace the Daytime Running Lamp (DRL) Module.

Is the repair complete?

--

System OK

--

13

  1. Disconnect the brake pressure warning switch connector.
  2. Turn the ignition switch to run.
  3. Connect a fused jumper from brake pressure warning switch connector PPL (680) wire cavity A to ground.

Does the brake indicator light?

--

Go to Step 14

Go to Step 16

14

Connect a fused jumper from the brake pressure warning switch connector PPL (680) wire cavity A to BLK (650) wire cavity B.

Does the brake indicator light?

--

System OK

Go to Step 15

15

Locate and repair open in BLK (650) wire between brake pressure warning switch and G106.

Is the repair complete?

--

System OK

--

16

Connect a fused jumper from the Electronic Brake Control Module (C1) PPL (680) wire cavity H to ground.

Does the brake indicator light?

--

Go to Step 19

Go to Step 17

17

Connect a test lamp from TAN/WHT (33) wire cavity F to ground.

Does the brake indicator light?

--

Go to Step 19

Go to Step 20

18

Locate and repair open in PPL (680) or TAN/WHT (33) wire between S129 and the Daytime Running Lamp (DRL) Module.

Is the repair complete?

--

System OK

--

19

Replace the Electronic Brake Control Module (EBCM). Refer to Electronic Brake Control Module Replacement in Antilock Brake Systems.

Is the repair complete?

--

System OK

--

20

  1. Disconnect Daytime Running Lamp (DRL) Module connector.
  2. Connect a fused jumper from Daytime Running Lamp (DRL) Module TAN/WHT (33) wire cavity E to TAN/WHT (33) wire cavity F.

Does the brake indicator light?

--

Go to Step 12

Go to Step 21

21

Locate and repair open in TAN/WHT (33) wire between the Daytime Running Lamp Module and the Instrument Cluster.

Is the repair complete?

--

System OK

--

22

  1. Disconnect connector C201
  2. Connect a DMMJ 39200 from the steering column C201 connector BLK (750) wire cavity B2 to ground.

Is there continuity?

--

Go to Step 24

Go to Step 23

23

Locate and repair open in BLK (750) wire between C201 and G110.

Is the repair complete?

--

System OK

--

24

Connect a fused jumper Between C201 LT BLU (1134) wire cavity B5 and ground.

Does the brake warning indicator light?

--

Go to Step 27

Go to Step 25

25

  1. Disconnect the Daytime Running Lamp (DRL) Module.
  2. Connect DMMJ 39200 from the Daytime Running Lamp (DRL) Module LT BLU (1134) wire cavity B to C201 cavity B5.

Is there continuity?

--

Go to Step 12

G o to Step 26

26

Locate and repair open in LT BLU (1134) wire between daytime running lamp module and C201 connector.

Is the repair complete?

--

System OK

--

27

Replace the ignition switch. Refer to Ignition Lock Cylinder Replacement - On Vehicle in Steering.

Is the repair complete?

--

System OK

--

28

  1. Disconnect the instrument cluster.
  2. Connect a test lampJ 35616-200 from instrument cluster connector PNK (39) wire B17 to ground.
  3. Turn the ignition switch to RUN.

Does the test lamp light?

--

Go to Step 29

Go to Step 30

29

  1. Connect the instrument cluster.
  2. Disconnect the Daytime Running Lamp (DRL) Module.
  3. Connect a fused jumper from TAN/WHT (33) wire cavity E to ground.
  4. Turn the ignition switch to Run

Does the brake indicator light?

--

Go to Step 12

Go to Step 31

30

Locate and repair open in PNK (39) wire between I/P fuse block and instrument cluster.

Is the repair complete?

--

System OK

--

31

Use a test lamp to backprobe Instrument Cluster TAN/WHT (33) wire cavity A13 to ground.

Does the test lampJ 35616-200 light?

--

Go to Step 32

Go to Step 33

32

Locate and repair open in TAN/WHT (33) between the Instrument Cluster and the Daytime Running Lamp (DRL) Module.

Is the repair complete?

--

System OK

--

33

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

Is the repair complete?

--

System OK

--