Toyota Venza Quiz
Heating / Air Conditioning

BUS IC Communication Malfunction (B1497/97)

In this manual: Heating / Air Conditioning
Introduction — 15Maintenance — 8Audio / Video — 102Garage Door Opener — 8Navigation / Multi Info Display — 81Park Assist / Monitoring — 50Brake (front) — 7Brake (rear) — 7Brake Control / Dynamic Control Systems — 79Brake System (other) — 28Parking Brake — 22Axle And Differential — 44Drive Shaft / Propeller Shaft — 24Mf1a Transfer / 4wd / Awd — 46U660e Automatic Transmission / Transaxle — 1241ar-fe Cooling — 311ar-fe Emission Control — 101ar-fe Engine Control — 1331ar-fe Engine Mechanical — 441ar-fe Fuel — 311ar-fe Intake / Exhaust — 211ar-fe Lubrication — 111ar-fe Starting — 16Cruise Control — 241ar-fe Battery / Charging — 162gr-fe Battery / Charging — 17Networking — 67Power Distribution — 8Power Assist Systems — 34Steering Column — 37Steering Gear / Linkage — 29Alignment / Handling Diagnosis — 4Front Suspension — 39Rear Suspension — 35Tire / Wheel — 4Tire Pressure Monitoring — 35Door / Hatch — 83Exterior Panels / Trim — 56Horn — 4Lighting (ext) — 89Mirror (ext) — 36Sliding Roof / Convertible — 26Window / Glass — 87Wiper / Washer — 30Door Lock — 85Heating / Air Conditioning — 82Interior Panels / Trim — 20Lighting (int) — 37Meter / Gauge / Display — 41Mirror (int) — 9Power Outlets (int) — 10Seat — 84Seat Belt — 43Supplemental Restraint Systems — 131Theft Deterrent / Keyless Entry — 155
~1min read
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

  1. 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

Test yourself

A quick Toyota Venza quiz: every answer comes with an explanation and a link to the manual page.