Toyota 4Runner manuals

Toyota 4Runner: Communication Malfunction (Bus Ic) (B1497)

DESCRIPTION

The air conditioning harness assembly connects the No. 1 air conditioning amplifier assembly and each servo motor. The No. 1 air conditioning amplifier assembly supplies power and sends operation instructions to each servo motor through the No. 1 air conditioning amplifier assembly. Each servo motor sends the damper position information to the No. 1 air conditioning amplifier assembly.

DTC Code

DTC Detection Condition

Trouble Area

B1497

An open circuit or malfunction in the communication line.

  • Air conditioning harness assembly
  • No. 1 air conditioning amplifier assembly

WIRING DIAGRAM


PROCEDURE

1.

CHECK NO. 1 AIR CONDITIONING AMPLIFIER ASSEMBLY

(a) Remove the No. 1 air conditioning amplifier assembly with its connectors still connected (See page ).



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

Standard Resistance:

Tester Connection

Condition

Specified Condition

z15-2 (BUS G) - Body ground

Always

Below 1 Ω

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

z15-2 (BUS G) - z15-4 (B BUS)

Always

11 to 14 V

z15-2 (BUS G) - z15-3 (BUS)

Ignition switch ON

Pulse generation

Text in Illustration

*a

Component with harness connected

(No. 1 Air Conditioning Amplifier Assembly)

Result

Result

Proceed to

OK (When troubleshooting according to problem symptoms table)

A

OK (When troubleshooting according to the DTC)

B

NG

C


A

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE


B

REPLACE AIR CONDITIONING HARNESS ASSEMBLY


C

REPLACE NO. 1 AIR CONDITIONING AMPLIFIER ASSEMBLY

Air Outlet Damper Control Servo Motor Circuit (B1443)
DESCRIPTION The damper servo sub-assembly (mode damper servo) sends pulse signals to inform the No. 1 air conditioning amplifier assembly of the damper position. The No. 1 air conditioning amplif ...

Air Inlet Damper Control Servo Motor Circuit (B1442)
DESCRIPTION The recirculation damper servo sub-assembly sends pulse signals to inform the No. 1 air conditioning amplifier assembly of the damper position. The No. 1 air conditioning amplifier as ...

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