C1513

Component Location





General Description

The brake light switch indicates brake pedal status to the ABS control unit. The switch is turned on when brake is depressed. The brake light switch is a normally-open contact which runs to battery voltage when active (brake depressed). When passive (brake not depressed), the cable is grounded via the break light bulbs.

DTC Description

The brake light signal is a reference to judge driver's will for braking. ABS ECU monitor open circuit of brake light switch for normal ABS control. HECU set the warning lamp if either BLS or BS is fault.

DTC Detecting Condition





Terminal and Connector Inspection

1. Many malfunctions in the electrical system are caused by poor harness(es) and terminal conditions. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?
YES
> Repair as necessary and then go to "Verification Of Vehicle Repair" procedure.
NO
> Go to "Signal Circuit Inspection" procedure.

Signal Circuit Inspection

1. Ignition "ON" & Engine "OFF".
2. Press the brake pedal.
3. Measure voltage between the terminal "5, 21" of the HECU harness connector and chassis ground.

Specification :
Brake Light Switch - Approx. B+
Brake Switch - Approx. 0 V





4. Is the measured signal waveform within specifications?
YES
> Fault is intermittent caused by open harness in brake light switch and brake switch line, faulty brake light switch or was repaired and HECU memory was not cleared. Go to the applicable troubleshooting procedure.
NO
> Check for damaged harness and poor connection in the power harness between the battery terminal(+) and the terminal "5, 21" of the HECU harness connector. Check for open or blown 15 A stop fuse. Repair as necessary and then go to "Verification Of Vehicle Repair" procedure.
> If OK, Go to "Component Inspection" procedure.

Component Inspection

1. Connect a ohmmeter to the connector of brake light switch, and check whether or not there is continuity when the plunger of the brake light switch is pushed in and when it is released.
The switch is in good condition if there is no continuity when the plunger is pushed.
2. Is there no continuity when the plunger is pushed?
YES
> Fault is intermittent caused by open harness in brake light switch line, faulty brake light switch or was repaired and HECU memory was not cleared. Go to the applicable troubleshooting procedure.
NO
> Substitute with a known-good brake light switch and check for proper operation. If problem is corrected, replace brake light switch and then go to "Verification Of Vehicle Repair" procedure.

Verification Of Vehicle Repair

After a repair, it is essential to verify that the fault has been corrected.
1. Connect scantool and select "Diagnostic Trouble Codes (DTCs)" mode.
2. Using a scantool, Clear DTC.
3. Operate the vehicle within DTC Detecting Condition in General Information.
4. Are any DTCs present ?
YES
> Go to the applicable troubleshooting procedure.
NO
> System performing to specification at this time.