Toyota 4Runner manuals

Toyota 4Runner: Stop Light Control Relay Malfunction (C1380)

DESCRIPTION

Upon receiving the hill-start assist control operating signal from the master cylinder solenoid (skid control ECU), the Stop light control relay (Stop light switch assembly) contact turns on and the stop lights come on.

DTC No.

DTC Detection Condition

Trouble Area

C1380

  • When the voltage at the IG1 terminal is 9.5 V or more 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 9.5 V or more 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 for 5 seconds or more.
  • Stop light control relay (Stop light switch assembly)
  • Stop light control relay (Stop light switch assembly) circuit
  • Master cylinder solenoid (Skid control ECU)

WIRING DIAGRAM


CAUTION / NOTICE / HINT

NOTICE:

  • When replacing the master cylinder solenoid, perform calibration (See page ).

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

HINT:

When DTC C1425 is output together with DTC C1380, inspect and repair the trouble areas indicated by DTC C1425 first (See page ).


PROCEDURE

1.

CHECK STOP LIGHT OPERATION

(a) 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


NG

INSPECT LIGHTING SYSTEM (STOP LIGHT CIRCUIT)

OK

2.

READ VALUE USING TECHSTREAM (STOP LIGHT SW)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Select the Data List on the Techstream (See page ).


ABS/VSC/TRAC

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

-

(d) Check that the stop light switch assembly condition observed on the Techstream changes according to brake pedal operation.

OK:

The Techstream displays ON or OFF according to brake pedal operation.


NG

GO TO STEP 8

OK

3.

PERFORM ACTIVE TEST USING TECHSTREAM (STOP LIGHT RELAY)

(a) Select the Active Test on the Techstream (See page ).


ABS/VSC/TRAC

Tester Display

Test Part

Control Range

Diagnostic Note

Stop Light Relay

Stop light control relay (Stop light switch assembly)

Relay (Switch) ON/OFF

Stop lights come on

(b) Perform the Active Test of the stop light control relay (stop light switch assembly) using the Techstream.

(c) Select the Data List on the Techstream (See page ).


ABS/VSC/TRAC

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Stop Light Relay Output

Stop light control relay (Stop light switch assembly) output / ON or OFF

ON: Relay output on

OFF: Relay output off

-

(d) Check for stop light control relay (stop light switch assembly) operation using the Data List and stop light operation by performing an Active Test.

Result

Proceed to

Data List content and stop light operation are normal.

A

Data List content and stop light operation are abnormal or Data List content is normal but stop lights do not turn on or off.

B


B

GO TO STEP 6

A

4.

CHECK HARNESS AND CONNECTOR (STP2 TERMINAL)

(a) Turn the ignition switch off.


(b) Make sure that there is no looseness at the locking part and the connecting part of the connector.

(c) Disconnect the A6 skid Control ECU connector.

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

A6-45 (STP2) - Body ground

Stop light switch assembly ON (Brake pedal depressed)

11 to 14 V

A6-45 (STP2) - Body ground

Stop light switch assembly OFF (Brake pedal released)

Below 1.5 V

Text in Illustration

*a

Front view of wire harness connector

(to Skid Control ECU)


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (STP2 CIRCUIT)

OK

5.

RECONFIRM DTC

(a) Reconnect the skid control ECU connector.

(b) Clear the DTCs (See page ).


(c) Turn the ignition switch to ON.

(d) Perform a road test.

(e) Check if the same DTC is output (See page
).

Result

Proceed to

DTC C1380 is not output.

A

DTC C1380 is output.

B


A

CHECK FOR INTERMITTENT PROBLEMS


B

REPLACE MASTER CYLINDER SOLENOID

6.

CHECK STOP LIGHT SWITCH ASSEMBLY

(a) Check the stop light control relay (stop light switch assembly) (See page ).


OK:

The stop light control relay (stop light switch assembly) is normal.


NG

REPLACE STOP LIGHT SWITCH ASSEMBLY

OK

7.

CHECK HARNESS AND CONNECTOR (STPO TERMINAL)

(a) Make sure that there is no looseness at the locking part and the connecting part of the connectors.


(b) Disconnect the A6 skid control ECU connector.

(c) Turn the ignition switch to ON.

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

A6-16 (STPO) - Body ground

Always

11 to 14 V

Text in Illustration

*a

Front view of wire harness connector

(to Skid Control ECU)


OK

REPLACE MASTER CYLINDER SOLENOID


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (STPO CIRCUIT)

8.

CHECK HARNESS AND CONNECTOR (STP TERMINAL)

(a) Turn the ignition switch off.


(b) Make sure that there is no looseness at the locking part and the connecting part of the connector.

(c) Disconnect the skid control ECU connector.

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

A6-7 (STP) - Body ground

Stop light switch assembly ON (Brake pedal depressed)

11 to 14 V

A6-7 (STP) - Body ground

Stop light switch assembly OFF (Brake pedal released)

Below 1.5 V

Text in Illustration

*a

Front view of wire harness connector

(to Skid Control ECU)


OK

REPLACE MASTER CYLINDER SOLENOID


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)

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