Toyota Venza: Brake Warning Light Remains ON

Toyota Venza Service Manual / Brake Control / Dynamic Control Systems / Vehicle Stability Control System / 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

INSPECT CAN COMMUNICATION SYSTEM

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.

CONNECT CONNECTOR TO ECU CORRECTLY

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

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

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

4.	INSPECT SKID CONTROL ECU (IG1 TERMINAL)

(a) Disconnect the skid control ECU connector.

(b) Turn the ignition switch to ON.

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))

REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT)

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))

REPAIR OR REPLACE HARNESS OR CONNECTOR (GND1 CIRCUIT)

6.	READ VALUE USING TECHSTREAM (PARKING BRAKE SWITCH)

(a) Reconnect the skid control ECU connector.

(b) Connect the Techstream to the DLC3.

(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	-

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.

GO TO STEP 10

7.	INSPECT BRAKE FLUID LEVEL WARNING SWITCH

(a) Turn the ignition switch off.

(b) Remove the reservoir filler cap and strainer.

(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.

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

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

Front view of wire harness connector

(to Combination Meter)

Front view of wire harness connector

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

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 ).

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 ).

REPLACE BRAKE ACTUATOR ASSEMBLY

REPLACE COMBINATION METER ASSEMBLY

10.	INSPECT PARKING BRAKE SWITCH

(a) Turn the ignition switch off.

(b) Disconnect the parking brake switch connector.

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

REPLACE PARKING BRAKE SWITCH

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

Front view of wire harness connector

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

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 ).

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK)

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. ...

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