Toyota Venza: Brake Signal Malfunction (B2284)

Toyota Venza Service Manual / Theft Deterrent / Keyless Entry / Smart Key System(for Start Function) / Brake Signal Malfunction (B2284)

DESCRIPTION

The power management control ECU receives brake signal information from 2 sources. It receives a signal from the stop light switch assembly via a direct line, and a signal from the ECM via CAN. If the information from these 2 sources is inconsistent, this DTC will be stored.

DTC No.	DTC Detection Condition	Trouble Area
B2284	Stop light switch assembly operation information received by the power management control ECU from the stop light switch assembly via a direct line and stop light switch assembly information from the ECM via CAN are inconsistent.	Stop light switch assembly CAN communication system ECM Power management control ECU Wire harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When the power management control ECU is replaced with a new one and the cable from the negative (-) battery terminal is connected, the power source mode becomes the on (IG) mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.
Inspect the fuse for circuits related to this system before performing the following inspection procedure.

HINT:

Check the connector connection to the terminal to make sure that there is no abnormality such as a loose connection, deformation, etc.

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (BATTERY - POWER MANAGEMENT CONTROL ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - POWER MANAGEMENT CONTROL ECU)

2.	CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BODY GROUND)

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - BODY GROUND)

3.	INSPECT STOP LIGHT SWITCH ASSEMBLY

(a) Remove the stop light switch assembly (See page ).

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
1 - 2	Pushed	10 kΩ or higher
3 - 4	Pushed	10 kΩ or higher
1 - 2	Not pushed	Below 1 Ω
3 - 4	Not pushed	Below 1 Ω

REPLACE STOP LIGHT SWITCH ASSEMBLY

4.	CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - POWER MANAGEMENT CONTROL ECU)

(a) Disconnect the D42 connector from the power management control ECU.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D42-10 (STP1) - A35-1	Always	Below 1 Ω
D42-10 (STP1) - Body ground	Always	10 kΩ or higher

Text in Illustration

Front view of wire harness connector

(to Power Management Control ECU)

Front view of wire harness connector

(to Stop Light Switch Assembly)

REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - POWER MANAGEMENT CONTROL ECU)

5.	READ VALUE USING TECHSTREAM (STOP LIGHT SWITCH ASSEMBLY)

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(d) Enter the following menus: Body Electrical / Power Source Control / Data List.

(e) Read the Data List according to the display on the Techstream.

Power Source Control

Tester Display	Measurement Item/Range	Normal Condition	Specified Condition
Stop Light Switch1	Stop light switch1/ON or OFF	ON: Brake pedal depressed OFF: Brake pedal released	-

Tester Display

Measurement Item/Range

Normal Condition

Specified Condition

Stop Light Switch1

Stop light switch1/ON or OFF

ON: Brake pedal depressed

OFF: Brake pedal released

Result	Proceed to
ON and OFF do not appear on the screen.	A
ON and OFF appear on the screen (for 2GR-FE).	B
ON and OFF appear on the screen (for 1AR-FE).	C

REPLACE POWER MANAGEMENT CONTROL ECU

GO TO SFI SYSTEM (for 2GR-FE)

GO TO SFI SYSTEM (for 1AR-FE)

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DESCRIPTION This DTC is stored when a problem such as an open in the AM2 fuse, an open or short in the wire harness between the fuse and power management control ECU, a short in the IG output cir ...

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DESCRIPTION This DTC is stored when there is a problem in the ACC output circuit. The ACC circuit is the circuit that goes from inside the power management control ECU to the ACC relay. ...

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