DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK STOP LIGHT OPERATION
READ VALUE USING GTS (STOP LIGHT SW)
PERFORM ACTIVE TEST USING GTS (STOP LIGHT RELAY)
CHECK HARNESS AND CONNECTOR (STP2 TERMINAL)
RECONFIRM DTC
CHECK HARNESS AND CONNECTOR (+B/GND TERMINAL)
CHECK HARNESS AND CONNECTOR (STP TERMINAL)
INSPECT BRK LP RELAY
CHECK HARNESS AND CONNECTOR (STOP LIGHT CONTROL RELAY - BRK LP RELAY)
CHECK HARNESS AND CONNECTOR (STOP LIGHT POWER SOURCE TERMINAL)
CHECK HARNESS AND CONNECTOR (STP TERMINAL)
INSPECT BRK LP RELAY
CHECK HARNESS AND CONNECTOR (BRK LP RELAY POWER SOURCE TERMINAL)
CHECK HARNESS AND CONNECTOR (STPO TERMINAL)
RECONFIRM DTC
DTC C1380 Stop Light Control Relay Malfunction
DESCRIPTION
Upon receiving the hill-start assist control operating signal from the skid control ECU (master cylinder solenoid), the relay contact turns on and the stop light comes on.
| DTC Code | DTC Detection Condition | Trouble Area |
| C1380 |
Either condition is met:
When the voltage at the IG1 terminal is between 11 and 14 V and the stop light control relay drive output (STPO) is on, a signal is not input to the STP2 terminal for 5 seconds or more.
When the voltage at the IG1 terminal is between 11 and 14 V and the stop light control relay drive output (STPO) is off, the signal at the STP terminal is different from the input signal at the STP2 terminal for 5 seconds or more.
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STOP fuse
Harness or connector
BRK LP relay (Brake light relay)
Stop light control relay assembly
Skid control ECU (Master cylinder solenoid)
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WIRING DIAGRAM
INSPECTION PROCEDURE
After replacing the master cylinder solenoid, perform zero point calibration and store the system information ().
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
- When DTC C1425 is output together with DTC C1380, inspect and repair the trouble areas indicated by DTC C1425 first ().
| 1.CHECK STOP LIGHT OPERATION |
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 |
| 2.READ VALUE USING GTS (STOP LIGHT SW) |
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.
| 3.PERFORM ACTIVE TEST USING GTS (STOP LIGHT RELAY) |
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 / Active Test.
ABS/VSC/TRC| Tester Display | Test Part | Control Range | Diagnostic Note |
| Stop Light Relay | BRK LP relay (Brake light relay) | Relay ON/OFF | Observe the stop lights (the stop lights do not come on for 2 to 5 seconds). |
While performing the Active Test, check the illumination condition of the stop lights and "Stop Light Relay Output" in the Data List.
ABS/VSC/TRC| Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
| Stop Light Relay Output | BRK LP relay (Brake light relay) output / ON or OFF | ON: Relay output on (Stop lights on)
OFF: Relay output off (Stop lights off) | - |
Result| Result | Proceed to |
| When Active Test performed, Data List item changes between ON and OFF and stop lights turn on and off | A |
| When Active Test performed, Data List item changes between ON and OFF, but stop lights do not turn on | B |
| 4.CHECK HARNESS AND CONNECTOR (STP2 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 |
| A24-45 (STP2) - 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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Turn the ignition switch off.
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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| 6.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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| 7.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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Remove the BRK LP relay (brake light relay) from the engine room relay block.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| 3 - 4 | Battery positive voltage is applied to terminal 1 and battery negative voltage is applied to terminal 2 | 10 kΩ or higher |
| Battery positive voltage is not applied to terminal 1 and battery negative voltage is not applied to terminal 2 | Below 1 Ω |
| 3 - 5 | Battery positive voltage is applied to terminal 1 and battery negative voltage is applied to terminal 2 | Below 1 Ω |
| Battery positive voltage is not applied to terminal 1 and battery negative voltage is not applied to terminal 2 | 10 kΩ or higher |
Text in Illustration| *1 | BRK LP Relay (Brake Light Relay) |
| | REPLACE BRAKE LIGHT RELAY |
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| 9.CHECK HARNESS AND CONNECTOR (STOP LIGHT CONTROL RELAY - BRK LP RELAY) |
Turn the ignition switch off.
Disconnect the A39 stop light control relay assembly connector.
Remove the BRK LP relay (brake light relay) from the engine room relay block.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| A39-8 (OUT) - Engine room relay block BRK LP relay (brake light relay) terminal 4 | Always | Below 1 Ω |
| A39-8 (OUT) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 10.CHECK HARNESS AND CONNECTOR (STOP LIGHT POWER SOURCE TERMINAL) |
Remove the BRK LP relay (brake light relay) from the engine room relay block.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Condition | Specified Condition |
| 4 - Body ground | Brake pedal depressed | 8 to 14 V |
| Brake pedal released | Below 1.5 V |
Text in Illustration| *a | Component without BRK LP Relay (Brake Light Relay)
(Engine Room Relay Block) |
| | REPLACE STOP LIGHT CONTROL RELAY ASSEMBLY |
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| OK | |
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| REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE ROOM RELAY BLOCK BRK LP RELAY TERMINAL 3 CIRCUIT) |
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| 11.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]) |
Result| Result | Proceed to |
| NG | A |
| OK (for LHD) | B |
| OK (for RHD) | C |
| | REPLACE MASTER CYLINDER SOLENOID ()
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| | REPLACE MASTER CYLINDER SOLENOID ()
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| A | |
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| REPAIR OR REPLACE HARNESS OR CONNECTOR |
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Remove the BRK LP relay (brake light relay) from the engine room relay block.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| 3 - 4 | Battery positive voltage is applied to terminal 1 and battery negative voltage is applied to terminal 2 | 10 kΩ or higher |
| Battery positive voltage is not applied to terminal 1 and battery negative voltage is not applied to terminal 2 | Below 1 Ω |
| 3 - 5 | Battery positive voltage is applied to terminal 1 and battery negative voltage is applied to terminal 2 | Below 1 Ω |
| Battery positive voltage is not applied to terminal 1 and battery negative voltage is not applied to terminal 2 | 10 kΩ or higher |
Text in Illustration| *1 | BRK LP Relay (Brake Light Relay) |
| | REPLACE BRAKE LIGHT RELAY |
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| 13.CHECK HARNESS AND CONNECTOR (BRK LP RELAY POWER SOURCE TERMINAL) |
Remove the BRK LP relay (brake light relay) from the engine room relay block.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Condition | Specified Condition |
| 1 - Body ground | Ignition switch ON | 8 to 14 V |
| 5 - Body ground | Always | 11 to 14 V |
Text in Illustration| *a | Component without BRK LP relay (Brake Light Relay)
(Engine Room Relay Block) |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 14.CHECK HARNESS AND CONNECTOR (STPO 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 | Switch Condition | Specified Condition |
| A24-16 (STPO) - Body ground | Ignition switch ON | 11 to 14 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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Turn the ignition switch off.
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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