Toyota Venza: Stop Light Control Relay Malfunction (C1380/64)

Toyota Venza Service Manual / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / Stop Light Control Relay Malfunction (C1380/64)

DESCRIPTION

Upon receiving the hill-start assist control operating signal from the skid control ECU, the relay contact turns on and the stop light comes on.

DTC Code	DTC Detection Condition	Trouble Area
C1380/64	Either of the following is detected: When the voltage at the IG1 terminal is between 10 and 14 V and the stop light control relay drive output (STP0) is ON, a signal has not been input to the STP terminal for 5 seconds or more. When the voltage at the IG1 terminal is between 10 and 14 V and the stop light control relay drive output (STP0) is OFF, the signal at the STP is different from the input signal at the STP2 for 5 seconds or more.	Stop light switch Stop light switch circuit Stop light control (BRK) relay Stop light control (BRK) relay circuit Brake actuator assembly (Skid control ECU)

WIRING DIAGRAM

Refer to DTC C1249/49 (See page ).

CAUTION / NOTICE / HINT

HINT:

When DTC C1249/49 is output together with DTC C1380/64, inspect and repair the trouble areas indicated by DTC C1249/49 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

INSPECT STOP LIGHT CIRCUIT

2.	READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

ABS/VSC/TRAC

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	-

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

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

OK:

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

GO TO STEP 9

3.	PERFORM ACTIVE TEST USING TECHSTREAM (STOP LIGHT CONTROL (BRK) RELAY)

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

ABS/VSC/TRAC

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Stop Light Relay	Stop light control (BRK) relay / ON or OFF	ON: Relay on OFF: Relay off	-
Stop Light Relay Output	Stop light control (BRK) relay output / ON or OFF	ON: Relay output on OFF: Relay output off	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Stop Light Relay

Stop light control (BRK) relay / ON or OFF

ON: Relay on

OFF: Relay off

Stop Light Relay Output

Stop light control (BRK) relay output / ON or OFF

ON: Relay output on

OFF: Relay output off

(b) 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 (BRK) relay	Relay ON/OFF	Stop lights come on

(d) Check for stop light control (BRK) relay operation using 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 is normal but stop lights do not turn on or off	B

GO TO STEP 6

4.	INSPECT SKID CONTROL ECU (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.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
A42-13 (STP2) - Body ground	Stop light switch ON (Brake pedal depressed)	8 to 14 V
A42-13 (STP2) - Body ground	Stop light switch OFF (Brake pedal released)	Below 1.5 V

Text in Illustration

*1	Front view of wire harness connector (to Brake Actuator (Skid Control ECU))

REPAIR OR REPLACE HARNESS OR CONNECTOR (STP2 CIRCUIT)

5.	RECONFIRM DTC

(a) Reconnect the skid control ECU connector.

(b) Clear the DTCs (See page ).

(d) Perform a road test.

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

Result	Proceed to
DTC (C1380/64) is not output	A
DTC (C1380/64) is output	B

CHECK FOR INTERMITTENT PROBLEMS

REPLACE BRAKE ACTUATOR ASSEMBLY

6.	INSPECT STOP LIGHT CONTROL (BRK) RELAY

(a) Turn the ignition switch off.

(b) Remove the stop light control (BRK) relay.

Standard Resistance:

Tester Connection	Condition	Specified Condition
3 - 4	Voltage is not applied between terminals 1 and 2	Below 1 Ω
3 - 5	Voltage is not applied between terminals 1 and 2	10 kΩ or higher
3 - 4	Voltage is applied between terminals 1 and 2	10 kΩ or higher
3 - 5	Voltage is applied between terminals 1 and 2	Below 1 Ω

Text in Illustration

*1	Stop Light Control (BRK) Relay

REPLACE STOP LIGHT CONTROL (BRK) RELAY

7.	INSPECT ENGINE ROOM RELAY BLOCK (POWER SOURCE TERMINAL)

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
Stop light control (BRK) relay terminal 5 - Body ground	Always	11 to 14 V
Stop light control (BRK) relay terminal 2 - Body ground	Ignition switch ON	11 to 14 V

Text in Illustration

*1	Engine Room Relay Block
*2	Stop Light Control (BRK) Relay

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

8.	INSPECT SKID CONTROL ECU (STP0 TERMINAL)

(a) Install the stop light control (BRK) relay.

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

(d) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
A42-39 (STP0) - Body ground	Ignition switch ON	11 to 14 V

Text in Illustration

*1	Front view of wire harness connector (to Brake Actuator (Skid Control ECU))

REPLACE BRAKE ACTUATOR ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR (STP0 CIRCUIT)

9.	INSPECT SKID CONTROL ECU (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.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
A42-30 (STP) - Body ground	Stop light switch ON (Brake pedal depressed)	8 to 14 V
A42-30 (STP) - Body ground	Stop light switch OFF (Brake pedal released)	Below 1.5 V

Text in Illustration

*1	Front view of wire harness connector (to Brake Actuator (Skid Control ECU))

REPLACE BRAKE ACTUATOR ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)

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