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:

Touch Panel Switch does not Function
PROCEDURE 1. CHECK MULTI-DISPLAY (a) Check if there is any foreign matter caught between the display and exterior frame of the multi-display. OK: No foreign matter is caught between the display and exterior frame of the m ...

Wireless Transmitter Memory Function does not Operate
DESCRIPTION With the ignition switch off and the driver door closed, pressing the manual lock or unlock switch on the power window regulator master switch assembly while holding a seat memory switch (M1 switch or M2 switch) will register the transmitter ...

Front Passenger Side Door Entry Unlock Function does not Operate
DESCRIPTION If the front passenger door entry lock function operates normally, but its entry unlock function does not, this means that the request code from the front passenger door is being output normally. In this case, a malfunction in the touch sensor ...

© 2016-2025 Copyright www.tovenza.com

0.1716