Toyota Venza manuals

Toyota Venza: Brake Warning Light Remains ON

DESCRIPTION

The skid control ECU is connected to the combination meter via CAN communication.

If any of the following is detected, the brake warning light remains on:

  • The skid control ECU connector is disconnected from the skid control ECU.
  • The brake fluid level is insufficient.
  • The parking brake is applied.
  • EBD operation is not possible.

WIRING DIAGRAM


PROCEDURE

1.

CHECK CAN COMMUNICATION SYSTEM

(a) Check if a CAN communication system DTC is output (See page ).


Result

Proceed to

DTC is not output

A

DTC is output

B


B

INSPECT CAN COMMUNICATION SYSTEM


A

2.

CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED

(a) Check if the skid control ECU connector is securely connected.

OK:

The connector is securely connected.


NG

CONNECT CONNECTOR TO ECU CORRECTLY


OK

3.

CHECK BATTERY

(a) Check the battery voltage.

Standard Voltage:

11 to 14 V

Result

Proceed to

OK

A

NG (for 2GR-FE)

B

NG (for 1AR-FE)

C


B

CHECK OR REPLACE CHARGING SYSTEM OR BATTERY (for 2GR-FE)


C

CHECK OR REPLACE CHARGING SYSTEM OR BATTERY (for 1AR-FE)


A

4.

INSPECT SKID CONTROL ECU (IG1 TERMINAL)

(a) Disconnect the skid control ECU connector.


(b) Turn the ignition switch to ON.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A42-28 (IG1) - 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))


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)


OK

5.

INSPECT SKID CONTROL ECU (GND1 TERMINAL)

(a) Turn the ignition switch off.


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A42-4 (GND1) - Body ground

Always

Below 1 Ω

Text in Illustration

*1

Front view of wire harness connector

(to Brake Actuator (Skid Control ECU))


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1 CIRCUIT)


OK

6.

READ VALUE USING TECHSTREAM (PARKING BRAKE SWITCH)

(a) Reconnect the skid control ECU connector.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

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


ABS/VSC/TRAC

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Parking Brake SW

Parking brake switch / ON or OFF

ON: Parking brake applied

OFF: Parking brake released

-

(e) Using the Techstream, check the input of switch operation when the parking brake is operated.

OK:

When the parking brake is operated, the display changes as shown above.


NG

GO TO STEP 10


OK

7.

INSPECT BRAKE FLUID LEVEL WARNING SWITCH

(a) Turn the ignition switch off.


(b) Remove the reservoir filler cap and strainer.

(c) Disconnect the brake fluid level warning switch connector.

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

HINT:

A float is located inside the reservoir. Its position can be changed by increasing or decreasing the level of brake fluid.

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

1 (+) - 2 (E)

Switch OFF (Float up)

1.9 to 2.1 kΩ

1 (+) - 2 (E)

Switch ON (Float down)

Below 1 Ω

Text in Illustration

*1

Component without harness connected

(Brake Master Cylinder Reservoir (Brake Fluid Level Warning Switch))

HINT:

If there is no problem after finishing the above check, adjust the brake fluid level to the MAX level.


NG

REPLACE BRAKE MASTER CYLINDER RESERVOIR ASSEMBLY (BRAKE FLUID LEVEL WARNING SWITCH)


OK

8.

CHECK HARNESS AND CONNECTOR (COMBINATION METER - BRAKE FLUID LEVEL WARNING SWITCH)

(a) Disconnect the combination meter connector.


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

E2-19 (B/LE) - A31-1 (+)

Always

Below 1 Ω

E2-19 (B/LE) - Body ground

Always

10 kΩ or higher

A31-2 (E) - Body ground

Always

Below 1 Ω

Text in Illustration

*1

Front view of wire harness connector

(to Combination Meter)

*2

Front view of wire harness connector

(to Brake Master Cylinder Reservoir (Brake Fluid Level Warning Switch))


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

9.

INSPECT COMBINATION METER ASSEMBLY

(a) Disconnect the combination meter connector and the brake fluid level warning switch connector.

(b) Perform the Active Test of the combination meter (meter CPU) using the Techstream (See page ).


(c) Check the combination meter.

OK:

The brake warning light turns on or off in accordance with the Techstream operation.

HINT:

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



OK

REPLACE BRAKE ACTUATOR ASSEMBLY


NG

REPLACE COMBINATION METER ASSEMBLY

10.

INSPECT PARKING BRAKE SWITCH

(a) Turn the ignition switch off.


(b) Disconnect the parking brake switch connector.

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

Standard Resistance:

Tester Connection

Switch Condition

Specified Condition

1 - Body ground

Parking brake switch ON

(Switch pin free)

Below 1 Ω

1 - Body ground

Parking brake switch OFF

(Switch pin pushed in)

10 kΩ or higher


NG

REPLACE PARKING BRAKE SWITCH


OK

11.

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - PARKING BRAKE SWITCH)

(a) Disconnect the main body ECU connector.


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

2C-7 (PKB) - L15-1

Always

Below 1 Ω

2C-7 (PKB) - Body ground

Always

10 kΩ or higher

Text in Illustration

*1

Front view of wire harness connector

(to Main Body ECU (Driver Side Junction Block))

*2

Front view of wire harness connector

(to Parking Brake Switch)

HINT:

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



OK

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK)


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

ABS Warning Light does not Come ON
DESCRIPTION The skid control ECU is connected to the combination meter via CAN communication. WIRING DIAGRAM Refer to ABS Warning Light Remains ON (See page ). PROCEDURE 1. ...

Brake Warning Light does not Come ON
DESCRIPTION The skid control ECU is connected to the combination meter via CAN communication. WIRING DIAGRAM Refer to Brake Warning Light Remains ON (See page ). PROCEDURE 1. ...

Other materials about Toyota Venza:

Voice is not Recognized
PROCEDURE 1. CHECK CONDITION (a) Check if the system voice recognition level is low when recognizing a particular voice. Result Proceed to System voice recognition level is low only fo ...

Removal
REMOVAL PROCEDURE 1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL NOTICE: When disconnecting the cable, some systems need to be initialized after the cable is reconnected (See page ). 2. REMOVE FRONT WHEEL RH 3. REMOVE NO. 1 ENGINE UNDER COVER 4. ...

Precaution
PRECAUTION 1. BEFORE WORKING ON FUEL SYSTEM (a) When disconnecting a fuel line, fuel will splash. So observe the following precautions: (1) Do not smoke or work near fire when handling the fuel system. (2) Keep gasoline away from rubber or leather parts. ...

© 2016-2019 Copyright www.tovenza.com

0.2241