Dtc B1497 Communication Malfunction (Bus Ic)

Vehicle Interior. Land Cruiser. Urj200, 202 Grj200 Vdj200
Heating Air Conditioning. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR DTC

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY)

PERFORM ACTIVE TEST USING INTELLIGENT TESTER

SYSTEM CHECK

REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (AIR MIX DAMPER SERVO)

REPLACE NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY

REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (MODE DAMPER SERVO)

REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (COOLER BYPASS DAMPER SERVO)

REPLACE AIR CONDITIONING HARNESS ASSEMBLY

DTC B1497 Communication Malfunction (Bus Ic)


DESCRIPTION

The air conditioning harness assembly connects the air conditioning amplifier assembly and servo motors. The air conditioning amplifier assembly supplies power and sends operation instructions to each servo motor through the air conditioning harness assembly. Each servo motor sends damper position information to the air conditioning amplifier assembly.

DTC Code
DTC Detection Condition
Trouble Area
B1497
An error or open in the communication line.
  1. Air conditioning harness assembly
  2. No. 1 air conditioning radiator damper servo sub-assembly (air mix damper servo)
  3. No. 1 blower damper servo sub-assembly
  4. No. 1 air conditioning radiator damper servo sub-assembly (mode damper servo)
  5. No. 1 air conditioning radiator damper servo sub-assembly (cooler bypass damper servo)
  6. Air conditioning amplifier assembly

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1497 Communication Malfunction (Bus Ic)


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.CHECK FOR DTC

  1. Clear the DTC (Click here).

  1. Check for the DTC (Click here).

    Result
    Result
    		Proceed to
    DTC B1497 is not output
    		A
    DTC B1497 is output
    		B


B
Go to step 2
A

USE SIMULATION METHOD TO CHECK (Click here)

2.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1497 Communication Malfunction (Bus Ic)

  1. Disconnect the E81 air conditioning amplifier assembly connector.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E81-21 (+B1) - Body ground
    		Always
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.PERFORM ACTIVE TEST USING INTELLIGENT TESTER

  1. Select the Active Test, use the intelligent tester to generate a control command, and then check that items operate (Click here).

    Air Conditioner
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Air Mix Servo Targ Pulse(D)
    		No. 1 air conditioning radiator damper servo sub-assembly (air mix damper servo)
    		Min.: 0, Max.: 255
    		-
    Air Inlet Damper Targ Pulse
    		No. 1 blower damper servo sub-assembly
    		Min.: 0, Max.: 255
    		-
    Air Outlet Servo Pulse(D)
    		No. 1 air conditioning radiator damper servo sub-assembly (mode damper servo)
    		Min.: 0, Max.: 255
    		-
    Cool Air Bypass Pulse
    		No. 1 air conditioning radiator damper servo sub-assembly (cooler bypass damper servo)
    		Min.: 0, Max.: 255
    		-
    OK:
    Arm of the damper servo motor selected in the Active Test moves smoothly.

  1. According to the test result, proceed to the next step.

    Result
    Result
    		Proceed to
    One of the damper servo motors is malfunctioning
    		A
    All of the damper servo motors are malfunctioning
    		B


B
Go to step 9
A


4.SYSTEM CHECK

  1. According to the test result, proceed to the next step.

    Result
    Result
    		Proceed to
    Only the No. 1 air conditioning radiator damper servo sub-assembly (air mix damper servo) is malfunctioning
    		A
    Only the No. 1 blower damper servo sub-assembly is malfunctioning
    		B
    Only the No. 1 air conditioning radiator damper servo sub-assembly (mode damper servo) is malfunctioning
    		C
    Only the No. 1 air conditioning radiator damper servo sub-assembly (cooler bypass damper servo) is malfunctioning
    		D


B
Go to step 6

C
Go to step 7

D
Go to step 8
A


5.REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (AIR MIX DAMPER SERVO)

  1. Temporarily replace the No. 1 air conditioning radiator damper servo sub-assembly (air mix damper servo).

    1. for LHD: Click here.
    2. for RHD: Click here.
    HINT:
    Since the No. 1 air conditioning radiator damper servo sub-assembly (air mix damper servo) cannot be inspected while it is removed from the vehicle, replace the No. 1 air conditioning radiator damper servo sub-assembly (air mix damper servo) with a new or normally functioning one and check that the condition returns to normal.

  1. Clear the DTC (Click here).

  1. Check for the DTC (Click here).

    Result
    Result
    		Proceed to
    DTC B1497 is not output
    		A
    DTC B1497 is output
    		B


B
Go to step 9
A

END (NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY [AIR MIX DAMPER SERVO] IS FAULTY)

6.REPLACE NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY

  1. Temporarily replace the No. 1 blower damper servo sub-assembly (Click here).

    HINT:
    Since the No. 1 blower damper servo sub-assembly cannot be inspected while it is removed from the vehicle, replace the No. 1 blower damper servo sub-assembly with a new or normally functioning one and check that the condition returns to normal.

  1. Clear the DTC (Click here).

  1. Check for the DTC (Click here).

    Result
    Result
    		Proceed to
    DTC B1497 is not output
    		A
    DTC B1497 is output
    		B


B
Go to step 9
A

END (NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY IS FAULTY)

7.REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (MODE DAMPER SERVO)

  1. Temporarily replace the No. 1 air conditioning radiator damper servo sub-assembly (mode damper servo).

    1. for LHD: Click here.
    2. for RHD: Click here.
    HINT:
    Since the No. 1 air conditioning radiator damper servo sub-assembly (mode damper servo) cannot be inspected while it is removed from the vehicle, replace the No. 1 air conditioning radiator damper servo sub-assembly (mode damper servo) with a new or normally functioning one and check that the condition returns to normal.

  1. Clear the DTC (Click here).

  1. Check for the DTC (Click here).

    Result
    Result
    		Proceed to
    DTC B1497 is not output
    		A
    DTC B1497 is output
    		B


B
Go to step 9
A

END (NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY [MODE DAMPER SERVO] IS FAULTY)

8.REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (COOLER BYPASS DAMPER SERVO)

  1. Temporarily replace the No. 1 air conditioning radiator damper servo sub-assembly (cooler bypass damper servo).

    1. for LHD: Click here.
    2. for RHD: Click here.
    HINT:
    Since the No. 1 air conditioning radiator damper servo sub-assembly (cooler bypass damper servo) cannot be inspected while it is removed from the vehicle, replace the No. 1 air conditioning radiator damper servo sub-assembly (cooler bypass damper servo) with a new or normally functioning one and check that the condition returns to normal.

  1. Clear the DTC (Click here).

  1. Check for the DTC (Click here).

    Result
    Result
    		Proceed to
    DTC B1497 is not output
    		A
    DTC B1497 is output
    		B


B
Go to step 9
A

END (NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY [COOLER BYPASS DAMPER SERVO] IS FAULTY)

9.REPLACE AIR CONDITIONING HARNESS ASSEMBLY

  1. Temporarily replace the air conditioning harness assembly.

    1. for LHD: Click here.
    2. for RHD: Click here.
    HINT:
    Since the air conditioning harness assembly cannot be inspected while it is removed from the vehicle, replace the air conditioning harness assembly with a new or normally functioning one and check that the condition returns to normal.

  1. Clear the DTC (Click here).

  1. Check for the DTC (Click here).

    Result
    Result
    		Proceed to
    DTC B1497 is not output
    		A
    DTC B1497 is output
    		B


B
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)
A

END (AIR CONDITIONING HARNESS ASSEMBLY IS FAULTY)