Toyota Venza manuals

Toyota Venza: Open in Stop Light Switch Circuit (C1249/49)

DESCRIPTION

The skid control ECU (housed in the actuator assembly) inputs the stop light switch signal and the condition of brake operation.

The skid control ECU has an open detection circuit, which outputs this DTC when detecting an open in the stop light input line or the ground line of the stop light circuit with the stop light switch off (brake pedal not depressed).

DTC Code

DTC Detection Condition

Trouble Area

C1249/49

After the ignition switch is turned to ON, the STP terminal voltage of the ECU is 40% to 67% of its supplied voltage for 3 seconds.

  • STOP fuse
  • 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



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

GO TO STEP 4


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 display 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 11


OK

3.

RECONFIRM DTC

(a) Turn the ignition switch off.

(b) Clear the DTCs (See page ).


(c) Start the engine.

(d) Depress the brake pedal several times to test the stop light circuit.

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


Result

Proceed to

DTC (C1249/49) is not output

A

DTC (C1249/49) is output

B

HINT:

If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step (See page ).



A

CHECK FOR INTERMITTENT PROBLEMS


B

REPLACE BRAKE ACTUATOR ASSEMBLY

4.

INSPECT STOP FUSE

(a) Remove the STOP fuse from the main body ECU (driver side junction block).


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

STOP (10 A) fuse

Always

Below 1 Ω

Text in Illustration

*1

Main Body ECU (Driver Side Junction Block)

*2

STOP Fuse


NG

REPLACE STOP FUSE


OK

5.

INSPECT STOP LIGHT SWITCH (POWER SOURCE TERMINAL)

(a) Install the STOP fuse.


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

(c) Disconnect the stop light switch connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A35-2 - Body ground

Always

11 to 14 V

Text in Illustration

*1

Front view of wire harness connector

(to Stop Light Switch)


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)


OK

6.

INSPECT STOP LIGHT SWITCH

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

1 - 2

Switch pin free

Below 1 Ω

1 - 2

Switch pin pushed in

10 kΩ or higher



NG

REPLACE STOP LIGHT SWITCH


OK

7.

INSPECT STOP LIGHT CONTROL (BRK) RELAY

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


(b) 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

Text in Illustration

*1

Stop Light Control (BRK) Relay


NG

REPLACE STOP LIGHT CONTROL (BRK) RELAY


OK

8.

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - ENGINE ROOM RELAY BLOCK)

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



Standard Resistance:

Tester Connection

Condition

Specified Condition

A35-1 - Stop light control (BRK) relay terminal 4

Always

Below 1 Ω

Text in Illustration

*1

Front view of wire harness connector

(to Stop Light Switch)

*2

Engine Room Relay Block

*3

Stop Light Control (BRK) Relay


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

9.

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - ENGINE ROOM RELAY BLOCK)

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



(b) Disconnect the skid control ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A42-30 (STP) - Stop light control (BRK) relay terminal 3

Always

Below 1 Ω

Text in Illustration

*1

Front view of wire harness connector

(to Brake Actuator (Skid Control ECU))

*2

Engine Room Relay Block

*3

Stop Light Control (BRK) Relay


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

10.

RECONFIRM DTC

(a) Clear the DTCs (See page ).


(b) Start the engine.

(c) Depress the brake pedal several times to test the stop light circuit.

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


HINT:

Reinstall the relay, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

Result

Proceed to

DTC (C1249/49) is not output

A

DTC (C1249/49) is output

B

HINT:

If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step (See page ).



A

INSPECT LIGHTING SYSTEM (STOP LIGHT CIRCUIT)


B

REPLACE BRAKE ACTUATOR ASSEMBLY

11.

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - ENGINE ROOM RELAY BLOCK)

(a) Turn the ignition switch off.



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

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

(d) Disconnect the skid control ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A42-30 (STP) - Stop light control (BRK) relay terminal 3

Always

Below 1 Ω

Text in Illustration

*1

Front view of wire harness connector

(to Brake Actuator (Skid Control ECU))

*2

Engine Room Relay Block

*3

Stop Light Control (BRK) Relay


OK

REPLACE BRAKE ACTUATOR ASSEMBLY


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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