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:

Pressure Control Solenoid "A" Electrical (Shift Solenoid Valve SL1) (P0748)
DESCRIPTION Changing from 1st to 6th is performed by the TCM turning shift solenoid valves SL1, SL2, SL3, SL4 and SL on and off. If an open or short circuit occurs in any of the shift solenoid valves, the TCM controls the remaining normal shift solenoid ...

AV Signal Stoppage (Low Battery Voltage) (B158F)
DESCRIPTION This DTC is stored when a video or audio signal is interrupted due to battery voltage input to the navigation receiver assembly dropping temporarily. DTC No. DTC Detection Condition Trouble Area ...

Data List / Active Test
DATA LIST / ACTIVE TEST 1. DATA LIST HINT: Using the Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful bec ...

© 2016-2019 Copyright www.tovenza.com

0.2095