Toyota Venza manuals

Toyota Venza: 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:

  1. 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.
  2. 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


NG

INSPECT STOP LIGHT CIRCUIT


OK

2.

READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH)

(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 / 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.


NG

GO TO STEP 9


OK

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

-

(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

(c) Perform the Active Test of the stop light control (BRK) relay using the Techstream.

(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


B

GO TO STEP 6


A

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.

(c) Disconnect the skid control ECU 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))


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) Start the engine.

(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


A

CHECK FOR INTERMITTENT PROBLEMS


B

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.

(c) Measure the resistance according to the value(s) in the table below.

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


NG

REPLACE STOP LIGHT CONTROL (BRK) RELAY


OK

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



NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)


OK

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.

(c) Disconnect the skid control ECU 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))


OK

REPLACE BRAKE ACTUATOR ASSEMBLY


NG

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.

(c) Disconnect the skid control ECU 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))


OK

REPLACE BRAKE ACTUATOR ASSEMBLY


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (STP CIRCUIT)

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