Toyota Venza manuals

Toyota Venza: BUS IC Communication Malfunction (B1497/97)

Toyota Venza Service Manual / Heating / Air Conditioning / Air Conditioning System / BUS IC Communication Malfunction (B1497/97)

DESCRIPTION

The air conditioning harness connects the A/C amplifier and each servo. The A/C amplifier supplies power and sends operation instructions to each servo through the air conditioning harness. Each servo sends the damper position information to the A/C amplifier.

DTC No.

DTC Detection Condition

Trouble Area

B1497/97

Communication line error or open

  • Air conditioning harness
  • A/C amplifier

WIRING DIAGRAM


PROCEDURE

1.

INSPECT A/C AMPLIFIER

(a) Remove the A/C amplifier with the connectors still connected.


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

z7-2 (BUS G) - Body ground

Always

Below 1 Ω

Text in Illustration

*1

Component with harness connected

(A/C Amplifier)


NG

REPLACE A/C AMPLIFIER


OK

2.

INSPECT A/C AMPLIFIER

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

z7-4 (B BUS) - z7-2 (BUS G)

Ignition switch off

Below 1 V

z7-4 (B BUS) - z7-2 (BUS G)

Ignition switch ON

11 to 14 V

z7-3 (BUS) - z7-2 (BUS G)

Ignition switch ON

Pulse generation

Text in Illustration

*1

Component with harness connected

(A/C Amplifier)



OK

REPLACE AIR CONDITIONING HARNESS


NG

REPLACE A/C AMPLIFIER

Compressor Solenoid Circuit (B1451/51)
DESCRIPTION In this circuit, the A/C compressor receives a refrigerant compression demand signal from the A/C amplifier. Based on this signal, the A/C compressor changes the amount of compressor o ...

Air Mix Damper Control Servo Motor Circuit (Driver Side) (B1446/46)
DESCRIPTION The air mix control servo motor sends pulse signals to indicate the damper position to the A/C amplifier. The A/C amplifier activates the motor (normal or reverse) based on these sign ...

Other materials about Toyota Venza:

Installation
INSTALLATION PROCEDURE 1. INSTALL NO. 3 ANTENNA CORD SUB-ASSEMBLY (a) Pass the washer hose through the No. 3 antenna cord sub-assembly. (b) Pass the No. 3 antenna cord sub-assembly with washer hose through the vehicle body as shown in the il ...

Portable Player cannot be Connected Manually/Automatically
CAUTION / NOTICE / HINT HINT: Some versions of "Bluetooth" compatible audio players may not function properly, or the functions may be limited using the radio and display receiver assembly, even if the portable audio player itself can play file ...

Disassembly
DISASSEMBLY PROCEDURE 1. REMOVE NO. 2 HEADLIGHT BULB (for Halogen Headlight) (a) Turn the No. 2 headlight bulb in the direction indicated by the arrow shown in the illustration, and remove it. NOTICE: Do not touch the bulb glass. ...

© 2016-2025 Copyright www.tovenza.com

0.1139