GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Were you sent here from the Hydraulic Brake Diagnostic System Check?

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Go to Step 2

Go to Hydraulic Brake Diagnostic System Check

2

Check the BRAKE warning indicator for operation during the following conditions:

    • Bulb check
    • Parking brake engaged
    • Brake fluid level is low

Will the indicator illuminate, during any 1 or more of the above conditions?

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Go to Step 3

Go to Step 4

3

Is the BRAKE indicator inoperative during bulb check?

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Go to Step 4

Go to Step 5

4

Replace the instrument cluster assembly printed circuit. Refer to Printed Instrument Cluster Circuit Replacement .

Is the replacement complete?

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Go to Hydraulic Brake Diagnostic System Check

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5

Is the BRAKE indicator inoperative with the parking brake engaged?

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Go to Step 6

Go to Step 15

6

With the ignition switch in the ON position:

Backprobe cavity 16 of connector C1 of junction block 3 with a J 36169-A .

Does the BRAKE indicator illuminate?

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Go to Step 8

Go to Step 7

7

Repair or replace junction block 3.

Is the repair/replacement complete?

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Go to Hydraulic Brake Diagnostic System Check

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8

Backprobe cavity 4 of the daytime running lamps (DRL) control module with a J 36169-A .

Does the BRAKE indicator illuminate?

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Go to Step 10

Go to Step 9

9

Repair the RED/YEL wire between cavity 16 of connector C1 of junction block 3 and cavity 4 of the DRL control module. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Hydraulic Brake Diagnostic System Check

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10

Backprobe cavity 14 of the DRL control module with a J 36169-A .

Does the BRAKE indicator illuminate?

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Go to Step 12

Go to Step 11

11

Replace the DRL control module. Refer to Daytime Running Lights (DRL) Control Module Replacement in Lighting Systems.

Is the repair complete?

--

Go to Hydraulic Brake Diagnostic System Check

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12

Backprobe the parking brake switch with a J 36169-A .

Does the BRAKE indicator illuminate?

--

Go to Step 14

Go to Step 13

13

Repair the RED/BLK wire between the parking brake switch and the daytime running lamp (DRL) control module. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Hydraulic Brake Diagnostic System Check

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14

Replace the parking brake switch. Refer to Parking Brake Indicator Switch Replacement .

Is the replacement complete?

--

Go to Hydraulic Brake Diagnostic System Check

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15

With the ignition switch in the ON position:

Backprobe cavity 16 of connector C3 of junction block 3 with a J 36169-A .

Does the BRAKE indicator illuminate?

--

Go to Step 16

Go to Step 7

16

Backprobe cavity 3 of connector C3 of junction block 1 with a J 36169-A .

Does the BRAKE indicator illuminate?

--

Go to Step 18

Go to Step 17

17

Repair the RED/YEL wire between cavity 16 of connector C3 of junction block 3 and cavity 3 of connector C3 of junction block 1. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Hydraulic Brake Diagnostic System Check

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18

Backprobe cavity 5 of connector C2 of junction block 1 with a J 36169-A Fused Jumper Wire.

Does the BRAKE indicator illuminate?

--

Go to Step 20

Go to Step 19

19

Repair/replace junction block 1.

Is the repair/replacement complete?

--

Go to Hydraulic Brake Diagnostic System Check

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20

Backprobe cavity 1 of the brake fluid level switch with a J 36169-A .

Does the BRAKE indicator illuminate?

--

Go to Step 22

Go to Step 21

21

Repair the RED/YEL wire between cavity 5 of connector C2 of junction block 1 and cavity 1 of the brake fluid level switch. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Hydraulic Brake Diagnostic System Check

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22

With a low brake fluid condition, backprobe cavity 2 of the brake fluid level switch with a J 36169-A .

Does the BRAKE indicator illuminate?

--

Go to Step 24

Go to Step 23

23

Replace the brake fluid level switch. Refer to Master Cylinder Reservoir Replacement .

Is the replacement complete?

--

Go to Hydraulic Brake Diagnostic System Check

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24

Repair the WHT/BLK wire between the brake fluid level switch and G103. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Hydraulic Brake Diagnostic System Check

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