For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Refrence: Brake Warning System Schematics
1 | Did you perform the Hydraulic Brake System Description and Operation and perform the necessary inspections? | Go to Step 2 | Go to Symptoms - Hydraulic Brakes
2 | Verify that the Brake Warning indicator is inoperative. Does the system operate normally? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3
3 | Check the BRAKE warning indicator for operation during the following conditions:

• | Parking brake engaged

• | Brake fluid level is low

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

Go to Step 5

Go to Step 4

4 | Replace the instrument cluster assembly printed circuit. Refer to Printed Instrument Cluster Circuit Replacement . Is the replacement complete? | Go to Step 24 | --
5 | With the ignition switch in the ON position: Test cavity 16 of connector C1 of junction block 3 for a short to voltage. Does the BRAKE indicator illuminate? | Go to Step 7 | Go to Step 6
6 | Repair or replace Junction Block 3. Is the repair/replacement complete? | Go to Step 24 | --
7 | Check cavity 4 of the daytime running lamps (DRL) control module. Does the BRAKE indicator illuminate? | Go to Step 9 | Go to Step 8
8 | 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 Step 24 | --
9 | Test cavity 14 of the DRL control module for a short to ground condition. Does the BRAKE indicator illuminate? | Go to Step 11 | Go to Step 10
10 | Replace the DRL control module. Refer to Daytime Running Lights (DRL) Control Module Replacement in Lighting Systems. Is the repair complete? | Go to Step 24 | --
11 | Using a test lamp check the parking brake switch for a short to ground. Does the BRAKE indicator illuminate? | Go to Step 13 | Go to Step 12
12 | 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 Step 24 | --
13 | Replace the parking brake switch. Refer to Parking Brake Indicator Switch Replacement . Is the replacement complete? | Go to Step 24 | --
14 | With the ignition switch in the ON position: Backprobe cavity 16 of connector C3 of junction block 3 . Does the BRAKE indicator illuminate? | Go to Step 15 | Go to Step 14
15 | Backprobe cavity 3 of connector C3 of junction block 1. Does the BRAKE indicator illuminate? | Go to Step 17 | Go to Step 16
16 | 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 Step 24 | --
17 | Check cavity 5 of connector C2 of junction block 1 with a Fused Jumper Wire. Does the BRAKE indicator illuminate? | Go to Step 19 | Go to Step 18
18 | Repair/replace junction block 1. Is the repair/replacement complete? | Go to Step 24 | --
19 | Check cavity 1 of the brake fluid level switch. Does the BRAKE indicator illuminate? | Go to Step 21 | Go to Step 20
20 | 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 Step 24 | --
21 | With a low brake fluid condition, check cavity 2 of the brake fluid level switch. Does the BRAKE indicator illuminate? | Go to Step 22 | Go to Step 23
22 | Replace the brake fluid level switch. Refer to Master Cylinder Reservoir Replacement . Is the replacement complete? | Go to Step 24 | --
23 | 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 Step 24 | --
24 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3