Dtc B1497/97 Bus Ic Communication Malfunction

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 ASSEMBLY AND BODY GROUND)

PERFORM ACTIVE TEST USING GTS (DAMPER SERVO MOTOR)

CHECK DAMPER SERVO MOTOR (CONNECTED TO AIR CONDITIONING HARNESS ASSEMBLY)

CHECK AIR CONDITIONING HARNESS ASSEMBLY

DTC B1497/97 BUS IC Communication Malfunction


DESCRIPTION

The air conditioning harness assembly connects the air conditioning amplifier assembly and each servo motor. 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 the damper position information to the air conditioning amplifier assembly.

DTC Code
DTC Detection Condition
Trouble Area
B1497/97
An open or error in the communication line.
  1. Air conditioning harness assembly
  2. No. 2 air conditioning harness assembly
  3. Air mix damper servo motor
  4. Damper servo motor (REC/FRS)
  5. Cool bypass damper servo motor
  6. Mode damper servo motor
  7. Air conditioning amplifier assembly
  8. Harness or connector

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1497/97 Bus Ic Communication Malfunction


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 DTCs (Click here).

  1. Check for DTCs (Click here).

    OK:
    DTC B1497/97 is not output.


NG
Go to step 2
OK

USE SIMULATION METHOD TO CHECK (Click here)

2.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY AND BODY GROUND)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1497/97 Bus Ic Communication Malfunction

  1. Disconnect the air conditioning amplifier assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E81-14 (GND) - Body ground
    		Always
    		Below 1 Ω

  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
Text in Illustration
*a
Front view of wire harness connector
(to Air Conditioning Amplifier Assembly)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.PERFORM ACTIVE TEST USING GTS (DAMPER SERVO MOTOR)

  1. Select the Active Test, use the GTS to generate a control command, and then check that the servo motors operates (Click here).

    Air Conditioner
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Air Mix Servo Targ Pulse(D)
    		Air mix damper servo motor pulse
    		Min.: 128, Max.: 383
    		Operates between 136 and 218 pulse
    Air Outlet Servo Pulse (D)
    		Mode damper servo motor Pulse
    		Min.: 128, Max.: 383
    		Operates between 136 and 245 pulse
    Air Inlet Damper Targ Pulse
    		Mode damper servo motor (REC/FRS) pulse
    		Min.: 128, Max.: 383
    		Operates between 137 and 165 pulse
    Cool Air Bypass Pulse
    		Cool bypass damper servo motor pulse
    		Min.: 128, Max.: 383
    		Operates between 134 and 185 pulse
    OK:
    Arm of the damper servo motor selected in the Active Test moves smoothly.
    Result
    Result
    		Proceed to
    Any front damper servo motor is malfunctioning
    		A
    All front damper servo motors are malfunctioning
    		B


B
Go to step 5
A


4.CHECK DAMPER SERVO MOTOR (CONNECTED TO AIR CONDITIONING HARNESS ASSEMBLY)

  1. Replace the malfunctioning damper servo motor connected to air conditioning harness assembly.

    1. for LHD: Click here
    2. for RHD: Click here
    HINT:
    Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a new one and check that the condition returns to normal.

  1. Clear the DTCs (Click here).

  1. Check for DTCs (Click here).

    OK:
    DTC B1497/97 is not output.


NG
Go to step 5
OK

END (DAMPER SERVO MOTOR WAS DEFECTIVE)

5.CHECK AIR CONDITIONING HARNESS ASSEMBLY

  1. Replace the air conditioning harness assembly with a new or known good one.

    1. for LHD: Click here
    2. for RHD: Click here

  1. Clear the DTCs (Click here).

  1. Check for DTCs (Click here).

    OK:
    DTC B1497/97 is not output.


NG
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)
OK

END (AIR CONDITIONING HARNESS ASSEMBLY WAS DEFECTIVE)