Toyota Venza: ACC Monitor Malfunction (B2274)

Toyota Venza Service Manual / Theft Deterrent / Keyless Entry / Smart Key System(for Start Function) / ACC Monitor Malfunction (B2274)

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.

DTC No.	DTC Detection Condition	Trouble Area
B2274	The ACC relay actuation circuit inside the power management control ECU or other related circuit is malfunctioning.	AM2 fuse ACC relay Power management control ECU Main Body ECU (driver side junction block assembly) 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 fuses for circuits related to this system before performing the following inspection procedure.

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.	CHECK HARNESS AND CONNECTOR

(a) Disconnect the 2G connector from the main body ECU (driver side junction block assembly).

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D43-19 (ACCD) - 2G-9	Always	Below 1 Ω
D43-19 (ACCD) - 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 connectors

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.	CHECK HARNESS AND CONNECTOR

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	INSPECT ACC RELAY

(a) Remove the ACC relay from the main body ECU (driver side junction block assembly).

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
1 - 2	Always	93.8 to 136.4 Ω
3 - 5	When battery voltage is not applied to terminals 1 and 2	10 kΩ or higher
3 - 5	When battery voltage is applied to terminals 1 and 2	Below 1 Ω

REPLACE ACC RELAY

6.	INSPECT MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

(a) Remove the main body ECU (driver side junction block assembly) (See page ).

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
2G-9 - ACC relay terminal 2	Always	Below 1 Ω
2G-9 - Body ground	Always	10 kΩ or higher
2F-16 - ACC relay terminal 1	Always	Below 1 Ω
2F-16 - Body ground	Always	10 kΩ or higher

Text in Illustration

Front view of wire harness connector

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

Front view of wire harness connector

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

Component without relay connected

(ACC Relay Terminal)

REPLACE POWER MANAGEMENT CONTROL ECU

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

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 EC ...

Engine does not Start

DESCRIPTION 1. ENGINE START SYSTEM FUNCTION (a) If the engine switch is pressed with the shift lever in P or N and the brake pedal depressed, the power management control ECU determines that this ...

Other materials about Toyota Venza:

How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT HINT: Use the following procedure to troubleshoot the windshield deicer system. PROCEDURE 1. VEHICLE BROUGHT TO WORKSHOP NEXT ...

Power Back Door cannot be Opened or Closed Using the Power Back Door Switch
DESCRIPTION When the power back door cannot be opened or closed using the power back door control switch, one of the following may be malfunctioning: 1) power back door control switch circuit, 2) power back door ECU (power back door motor unit) or 3) main ...

Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" ...