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Stoplamp Warning Circuit Diagnosis: Troubleshooting

TROUBLESHOOTING

Step Action Value (s) Yes No
1 Turn the ignition ON.
Is the brake warning lamp always ON?		 - Go to Step 2 Go to Step 18
2 Check the ABS warning lamp.
Is the ABS warning lamp also ON?		 - Go to Step 3 Go to Step 4
3 Use a scan tool to check for Diagnostic Trouble Codes (DTCs) and follow the procedures for any DTCs found.
Is the lamp still ON?		 - Go to Step 4 System OK
4 Release the parking brake fully.
Is the lamp OFF?		 - System OK Go to Step 5
5 Check the brake fluid level.
Is the fluid level OK?		 - Go to Step 7 Go to Step 6
6
  1. Fill the brake fluid reservoir with clean DOT 3 equivalent hydraulic fluid.
  2. Replace the cap on the fluid reservoir.

Is the lamp ON?		 - Go to Step 7 System OK
7 Disconnect the harness connector from the brake fluid level switch.
Is the lamp ON?		 - Go to Step 9 Go to Step 8
8 Replace the brake fluid level switch.
Is the repair complete?		 - System OK -
9
  1. Connect the brake fluid level switch.
  2. Disconnect the parking brake switch.

Is the lamp ON?		 - Go to Step 11 Go to Step 10
10 Replace the parking brake switch.
Is the repair complete?		 - System OK -
11 Connect the parking brake switch.
Is the vehicle equipped with ABS?		 - Go to Step 12 Go to Step 14
12
  1. Turn the ignition OFF.
  2. Disconnect the Electronic Brake Control Module (EBCM) connector.
  3. Turn the ignition ON.

Is the lamp ON?		 - Go to Step 14 Go to Step 13
13 Replace the Electronic Brake Control Module (EBCM).
Is the repair complete?		 - System OK -
14
  1. Turn the ignition OFF.
  2. Connect the EBCM connector.
  3. Check for a short to ground in the wiring between the instrument cluster terminal A19 and the brake fluid level switch.

Is the problem found?		 - Go to Step 17 Go to Step 15
15 Check for a short to ground in the wiring between the instrument cluster terminal A19 and the parking brake switch.
Is the problem found?		 - Go to Step 17 Go to Step 16
16 Check for a short to ground in the wiring between the instrument cluster terminal A19 and the EBCM connector terminal 21.
Is the problem found?		 - Go to Step 17 Go to Step 18
17 Repair the wiring as needed.
Is the repair complete?		 - System OK -
18 Check the brake lamp after doing each of the following functions:
  • Apply the parking brake.
  • Remove the cap from the brake fluid reservoir.
  • On vehicles equipped with ABS, command the lamp on using a scan tool.

Does the brake warning lamp operate for all of these conditions?		 - System OK Go to Step 19
19 When the operations listed in step 18 were performed, the brake warning lamp did not function.
Did the brake warning lamp fail to light for all of the operations listed in step 18?		 - Go to Step 20 Go to Step 27
20
  1. Turn the ignition OFF.
  2. Inspect the kick panel fuse F4.

Is the fuse OK?		 - Go to Step 22 Go to Step 21
21 Replace the fuse.
Is the repair complete?		 - System OK -
22 Inspect the brake warning lamp bulb.
Is the bulb OK?		 - Go to Step 24 Go to Step 23
23 Replace the bulb.
Is the repair complete?		 - System OK -
24
  1. Disconnect the instrument cluster connector.
  2. Turn the ignition ON.
  3. Measure the voltage at the instrument cluster connector terminal A19.

Does the voltage measure within the value specified?		 11 - 14 V Go to Step 25 Go to Step 26
25
  1. Turn the ignition OFF.
  2. Repair the open in the instrument cluster.

Is the repair complete?		 - System OK -
26
  1. Turn the ignition OFF.
  2. Repair the open in the wiring between the instrument cluster connector terminal A19 and the ignition switch.

Is the repair complete?		 - System OK -
27 Apply the parking brake again.
Does the parking brake warning lamp operate with the parking brake applied?		 - Go to Step 28 Go to Step 30
28 Remove the brake fluid reservoir cap.
Does the parking brake warning lamp operate with the cap from the brake fluid reservoir removed?		 - Go to Step 29 Go to Step 32
29 Check for an open between the instrument cluster connector terminal A1 and the EBCM connector terminal 21.
Is the problem found?		 - Go to Step 17 Go to Step 13
30
  1. Turn the ignition ON.
  2. Disconnect the parking brake switch.
  3. Jumper the parking brake switch connector terminal to ground.

Is the lamp ON?		 - Go to Step 10 Go to Step 31
31
  1. Turn the ignition OFF.
  2. Repair the open in the wire between the instrument cluster connector terminal A1 and the parking brake switch connector terminal.
  3. Is the repair complete?

Is the repair complete?		 - System OK -
32
  1. Disconnect the brake fluid level switch.
  2. Turn the ignition ON.
  3. Jumper the brake fluid level switch connector terminals.

Is the lamp ON?		 - Go to Step 8 Go to Step 33
33
  1. Turn the ignition OFF.
  2. Connect a test light between battery positive and the BRN/WHT wire terminal of the brake fluid level switch.

Is the test light ON?		 - Go to Step 34 Go to Step 35
34 Repair the open in the wiring between ground and the brake fluid level switch.
Is the repair complete?		 - System OK -
35 Repair the open in the wiring between the instrument cluster connector terminal A1 and the brake fluid level switch.
Is the repair complete?		 - System OK -
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