DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
READ VALUE USING GTS (STOP LIGHT SW)
RECONFIRM DTC
CHECK HARNESS AND CONNECTOR (STP TERMINAL)
CHECK HARNESS AND CONNECTOR (+B/GND TERMINAL)
CHECK HARNESS AND CONNECTOR (STP TERMINAL)
CHECK HARNESS AND CONNECTOR (OUT TERMINAL)
RECONFIRM DTC
DTC C1425 Open in Stop Light Switch Circuit
DESCRIPTION
The skid control ECU (master cylinder solenoid) has an open detection circuit, which stores this DTC when detecting an open in the stop light switch input line or the ground line of the stop light switch circuit with the stop light switch off (brake pedal not depressed).
| DTC Code | DTC Detection Condition | Trouble Area |
| C1425 | When the IG1 terminal voltage is between 9.5 and 17.4 V, an open in the STP terminal circuit continues for 3 seconds or more. | Stop light switch circuit
Stop light control relay assembly
Stop light control relay circuit
Skid control ECU (Master cylinder solenoid)
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WIRING DIAGRAM
INSPECTION PROCEDURE
- After replacing the master cylinder solenoid, perform zero point calibration ().
| 1.READ VALUE USING GTS (STOP LIGHT SW)
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Turn the ignition switch off.
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Enter the following menus: Chassis / ABS/VSC/TRC / Data List.
ABS/VSC/TRC| Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
| Stop Light SW | Stop light switch / ON or OFF | ON: Brake pedal depressed
OFF: Brake pedal released | - |
Check that the stop light switch condition observed on the GTS changes according to brake pedal operation.
- OK:
- The GTS displays ON and OFF according to brake pedal operation.
Turn the ignition switch off.
Depress the brake pedal several times to test the stop light circuit.
Check if the same DTC is output ().
Result| Result | Proceed to |
| DTC is not output | A |
| DTC is output (for LHD) | B |
| DTC is output (for RHD) | C |
| | REPLACE MASTER CYLINDER SOLENOID ()
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| | REPLACE MASTER CYLINDER SOLENOID ()
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| A | |
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| CHECK FOR INTERMITTENT PROBLEMS ()
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| 3.CHECK HARNESS AND CONNECTOR (STP TERMINAL) |
Turn the ignition switch off.
Disconnect the skid control ECU (master cylinder solenoid) connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Condition | Specified Condition |
| A24-7 (STP) - Body ground | Brake pedal depressed | 8 to 14 V |
| Brake pedal released | Below 1.5 V |
Text in Illustration| *a | Front view of wire harness connector
(to Skid Control ECU [Master Cylinder Solenoid]) |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 4.CHECK HARNESS AND CONNECTOR (+B/GND TERMINAL) |
Turn the ignition switch off.
Disconnect the stop light control relay assembly connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Condition | Specified Condition |
| A39-6 (+B) - Body ground | Always | 11 to 14 V |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| A39-4 (GND) - Body ground | Always | Below 1 Ω |
Text in Illustration| *a | Front view of wire harness connector
(to Stop Light Control Relay Assembly) |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 5.CHECK HARNESS AND CONNECTOR (STP TERMINAL) |
Turn the ignition switch off.
Disconnect the stop light control relay assembly connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Condition | Specified Condition |
| A39-2 (STP) - Body ground | Brake pedal depressed | 8 to 14 V |
| Brake pedal released | Below 1.5 V |
Text in Illustration| *a | Front view of wire harness connector
(to Stop Light Control Relay Assembly) |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 6.CHECK HARNESS AND CONNECTOR (OUT TERMINAL) |
Reconnect the stop light control relay assembly connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Condition | Specified Condition |
| A39-8 (OUT) - Body ground | Brake pedal depressed | 8 to 14 V |
| Brake pedal released | Below 1.5 V |
Text in Illustration| *a | Component with harness connected
(Stop Light Control Relay Assembly) |
| | REPLACE STOP LIGHT CONTROL RELAY ASSEMBLY |
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Turn the ignition switch off.
Depress the brake pedal several times to test the stop light circuit.
Check if the same DTC is output ().
Result| Result | Proceed to |
| DTC is not output | A |
| DTC is output (for LHD) | B |
| DTC is output (for RHD) | C |
| | REPLACE MASTER CYLINDER SOLENOID ()
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| | REPLACE MASTER CYLINDER SOLENOID ()
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| A | |
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| CHECK FOR INTERMITTENT PROBLEMS ()
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