BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS ANTI-LOCK BRAKE SYSTEM C1425 Open in Stop Light Switch Circuit
DESCRIPTION
The skid control ECU (brake actuator assembly) receives stop light switch signals and uses them to determine whether or not the brakes are applied.
The skid control ECU (brake actuator assembly) has a detection circuit that it uses to detect an open in the stop light input line.
If the skid control ECU (brake actuator assembly) detects an open in this circuit, it will store this DTC.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| C1425 | Open in Stop Light Switch Circuit | When IG1 terminal voltage is 9.5 V or more, an open in the stop light switch input line continues for 3 seconds or more. | ·
Wire harness or connector ·
Stop light switch assembly ·
Skid control ECU (brake actuator assembly) |
- HINT:
-
Even after the trouble areas are repaired, the ABS warning light will not go off unless the following operations are performed:
- 1.
Turn the ignition switch to ON.
2.Depress the brake pedal.
3.Clear the DTCs.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
- NOTICE:
-
Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
Check that the stop lights come on when the brake pedal is depressed, and go off when the brake pedal is released.
- OK:
Condition Illumination Condition Brake pedal depressed. On Brake pedal released. Off
- Result:
Proceed to OK NG
OK
NG
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Select the Data List using the GTS.
Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ANTI-LOCK BRAKE SYSTEM>DATA LIST / ACTIVE TEST
- Chassis > ABS/VSC/TRC > Data List
-
Tester Display Measurement Item Range Normal Condition Diagnostic Note Stop Light SW Stop light switch assembly ON or OFF ON: Brake pedal depressed
OFF: Brake pedal released-
- Chassis > ABS/VSC/TRC > Data List
-
Tester Display Stop Light SW - 50003 105 37
Check that the stop light switch display observed on the GTS changes according to brake pedal operation.
- OK:
The GTS displays ON or OFF according to brake pedal operation.
- Result:
Proceed to OK NG
OK
NG
Turn the ignition switch off.
Clear the DTCs.
Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ANTI-LOCK BRAKE SYSTEM>DTC CHECK / CLEAR
- Chassis > ABS/VSC/TRC > Clear DTCs
- 50002 105
Turn the ignition switch off.
Start the engine.
Depress the brake pedal several times to test the stop light circuit.
Check if the same DTC is output.
Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ANTI-LOCK BRAKE SYSTEM>DTC CHECK / CLEAR
- Chassis > ABS/VSC/TRC > Trouble Codes
- 50001 105
- Result:
Result Proceed to DTC C1425 is not output. A DTC C1425 is output. B
- HINT:
-
If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts.
-
Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ANTI-LOCK BRAKE SYSTEM>PROBLEM SYMPTOMS TABLE
A
Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>HOW TO PROCEED WITH TROUBLESHOOTING
B
| *a | Front view of wire harness connector
(to Skid Control ECU (Brake Actuator Assembly)) |
Turn the ignition switch off.
Make sure that there is no looseness at the locking part and the connecting part of the connector.
Disconnect the A48 skid control ECU (brake actuator assembly) connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection Condition Specified Condition A48-28 (STP) - Body ground Stop light switch ON (Brake pedal depressed) 11 to 14 V A48-28 (STP) - Body ground Stop light switch OFF (Brake pedal released) Below 1.5 V
- HINT:
-
If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts.
-
Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ANTI-LOCK BRAKE SYSTEM>PROBLEM SYMPTOMS TABLE
- Result:
Proceed to OK NG
OK
NG
Check the stop light switch assembly.
Click hereVehicle Exterior>LIGHTING (EXT)>STOP LIGHT SWITCH>ON-VEHICLE INSPECTION
- OK:
The stop light switch assembly is normal.
- Result:
Proceed to OK NG
OK
NG
| *a | Front view of wire harness connector
(to Skid Control ECU (Brake Actuator Assembly)) |
Make sure that there is no looseness at the locking part and the connecting part of the connector.
Disconnect the A48 skid control ECU (brake actuator assembly) connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
Tester Connection Condition Specified Condition A48-28 (STP) - Body ground Stop light switch ON (Brake pedal depressed) 11 to 14 V A48-28 (STP) - Body ground Stop light switch OFF (Brake pedal released) Below 1.5 V
- Result:
Proceed to OK NG
OK
NG
Reconnect the A48 skid control ECU (brake actuator assembly) connector.
Clear the DTCs.
Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ANTI-LOCK BRAKE SYSTEM>DTC CHECK / CLEAR
- Chassis > ABS/VSC/TRC > Clear DTCs
- 50002 105
Turn the ignition switch off.
Start the engine.
Depress the brake pedal several times to test the stop light circuit.
Check if the same DTC is output.
Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ANTI-LOCK BRAKE SYSTEM>DTC CHECK / CLEAR
- Chassis > ABS/VSC/TRC > Trouble Codes
- 50001 105
- Result:
Result Proceed to DTC C1425 is not output. A DTC C1425 is output. B
- HINT:
- ·
If the lighting system is normal but the DTC is still output, replace the skid control ECU (brake actuator assembly).
Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>BRAKE ACTUATOR>REMOVAL
·If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts.
Click hereBrake>BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS>ANTI-LOCK BRAKE SYSTEM>PROBLEM SYMPTOMS TABLE
A
Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>HOW TO PROCEED WITH TROUBLESHOOTING
B