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

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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 ...

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