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Home >> Suzuki >> 2005 >> Verona EX >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Brakes - Mechanical >> Diagnostic Information and Procedures >> Brake Lamp Warning Circuit >> Test Description

Test Description

The numbers below refer to steps in the diagnostic table.

  1. This step begins the test sequence for a BRAKE warning lamp that stays on when the engine is running.
  2. This step begins the test sequence for a BRAKE warning lamp that never turns on.
DIAGNOSTIC TEST REFERENCE

Step Action Value(s) Yes No
1 Start the engine and leave it running.
Does the BRAKE warning lamp stay on?		 - Go to Step 2. Go to Step 10.
2 With the engine running, release the parking brake.
Is the BRAKE warning lamp off?		 - System OK Go to Step 3.
3 Check the brake fluid level.
Is the fluid level OK?		 - Go to Step 5. Go to Step 4.
4
  1. Fill the brake fluid reservoir with clean DOT-3 or DOT-4 hydraulic fluid.
  2. Replace the cap on the fluid reservoir.
  3. Start the engine and leave it running.

Is the BRAKE warning lamp on?		 - Go to Step 5. System OK
5 Disconnect the wiring harness connector from the brake fluid level switch at the master cylinder reservoir.
Is the BRAKE warning lamp on?		 - Go to Step 7. Go to Step 6.
6 Replace the brake fluid level switch.
Is the repair complete?		 - System OK -
7
  1. Connect the brake fluid level switch.
  2. Disconnect the parking brake lever switch.
  3. Start the engine and leave it running.

Is the BRAKE warning lamp on?		 - Go to Step 9. Go to Step 8.
8 Replace the parking brake lever switch.
Is the repair complete?		 - System OK -
9 Repair the short circuit in the instrument wiring harness between terminal C2 of the instrument cluster and ground.
Is the repair complete?		 - System OK -
10
  1. Disconnect the electrical connector from the fluid level switch at the master cylinder reservoir.
  2. Connect a jumper wire between ground and terminal 1 of the fluid level switch harness connector.

Does the BRAKE warning lamp turn on?		 - Go to Step 11. Go to Step 13.
11
  1. Disconnect the electrical connector from the fluid level switch at the master cylinder reservoir.
  2. Connect a jumper wire between terminals 1 and 2 of the fluid level switch harness connector.

Does the BRAKE warning lamp turn on?		 - Go to Step 12. Go to Step 13.
12 Replace the brake fluid level switch on the master cylinder reservoir. The switch can be removed and replaced without draining the brake fluid from the reservoir.
Is the repair complete?		 - System OK -
13
  1. Turn the ignition ON.
  2. Apply the parking brake.

Does the BRAKE warning lamp turn on?		 - Go to Step 27. Go to Step 14.
14 Check fuse F12
Is fuse F12 blown?		 - Go to Step 15. Go to Step 16.
15
  1. Check for a short circuit and repair it, if necessary.
  2. Replace fuse F12.

Is the repair complete?		 - System OK -
16
  1. Turn the ignition ON.
  2. Check the voltage at F12.

Is the voltage equal to the specified value?		 11~14 V Go to Step 18. Go to Step 17.
17 Repair the power supply to fuse F12.
Is the repair complete?		 - System OK -
18
  1. Disconnect terminal B14 of the instrument cluster.
  2. Turn the ignition ON.
  3. Use a voltmeter to check the voltage at terminal B14.

Is the voltage equal to the specified value?		 11~14 V Go to Step 20. Go to Step 19.
19 Repair the open circuit between terminal B14 of the instrument cluster and fuse F12.
Is the repair complete?		 - System OK -
20
  1. Reconnect terminal B14 of the instrument cluster.
  2. Turn the ignition ON.
  3. Use a voltmeter to backprobe terminal C2 of the instrument cluster.

Is the voltage equal to the specified value?		 11~14 V Go to Step 24. Go to Step 21.
21
  1. Remove the BRAKE warning lamp from its socket.
  2. Test the BRAKE warning lamp.

Is the BRAKE warning lamp OK?		 - Go to Step 22. Go to Step 23.
22 Replace the instrument cluster.
Is the repair complete?		 - System OK -
23 Replace the BRAKE warning lamp.
Is the repair complete?		 - System OK -
24
  1. Disconnect the parking brake switch connector.
  2. Connect a jumper wire between the switch connector and ground.
  3. Turn the ignition ON.

Is the BRAKE warning lamp on?		 - Go to Step 25. Go to Step 26.
25 Replace the BRAKE warning lamp switch.
Is the repair complete?		 - System OK -
26 Repair the open circuit between the BRAKE warning lamp switch and terminal C2 of the instrument cluster.
Is the repair complete?		 - System OK -
27
  1. Disconnect the brake fluid level switch at the master cylinder reservoir.
  2. Use an ohmmeter to check the resistance between terminal 2 of the switch connector and ground.

Is the resistance equal to the specified value?		 0 Go to Step 28. Go to Step 29.
28 Repair the open circuit between ground and the brake fluid level switch.
Is the repair complete?		 - System OK -
29 Repair the open circuit between terminal 1 of the brake fluid level switch and terminal C2 of the instrument cluster.
Is the repair complete?		 - System OK -
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