Dtc B1497/97 Bus Ic Communication Malfunction

Vehicle Interior. Corolla. Zre142 Aze141
Heating Air Conditioning. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING TECHSTREAM

SYSTEM CHECK

REPLACE AIR MIX CONTROL SERVO MOTOR

REPLACE AIR INLET CONTROL SERVO MOTOR

REPLACE AIR OUTLET CONTROL SERVO MOTOR

REPLACE AIR CONDITIONING HARNESS

CHECK HARNESS AND CONNECTOR (POWER SOURCE)

DTC B1497/97 BUS IC Communication Malfunction


DESCRIPTION

The air conditioning harness connects the A/C amplifier and each servo motor. The A/C amplifier supplies power and sends operation instructions to each servo motor through the air conditioning harness. Each servo motor sends the damper position information to the A/C amplifier. The A/C amplifier communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness.

DTC No.
DTC Detection Condition
Trouble Area
B1497/97
Communication line error or open
  1. Air conditioning harness
  2. Air mix control servo motor
  3. Air inlet control servo motor
  4. Air outlet control servo motor
  5. A/C amplifier

WIRING DIAGRAM


Corolla. Zre142 Aze141.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.PERFORM ACTIVE TEST USING TECHSTREAM

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Enter the following menus: Body Electrical / Air Conditioner / Active test.

  1. Check the operation by referring to the table below.

    Air Conditioner
    Tester Display
    		Test Part
    		Control Range
    		Diagnostic Note
    Air Mix Servo Targ Pulse(D)
    (Air Mix Pulse-D)
    		Air mix control servo motor pulse
    		Min.: 0, Max.: 255
    		-
    Air Outlet Servo Pulse (D)
    (Air Out Pulse-D)
    		Air outlet control servo motor pulse
    		Min.: 0, Max.: 255
    		-
    Air Inlet Damper Targ Pulse
    (A/I Damp Targ Pls)
    		Air inlet control servo motor pulse
    		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 6
A


2.SYSTEM CHECK

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

Result:
Result
Proceed to
Only the air mix control servo motor is malfunctioning
A
Only the air inlet control servo motor is malfunctioning
B
Only the air outlet control servo motor is malfunctioning
C


B
Go to step 4

C
Go to step 5
A


3.REPLACE AIR MIX CONTROL SERVO MOTOR

  1. Replace the air mix control servo motor (COROLLA_ZRE142 RM000001HLX05GX.html).

    HINT:
    Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a new or a known good one and check that the condition returns to normal.

  1. Check for the DTC.

    Result:
    Result
    		Proceed to
    DTC B1497/97 is not output
    		A
    DTC B1497/97 is output
    		B


B
Go to step 6
A

END

4.REPLACE AIR INLET CONTROL SERVO MOTOR

  1. Replace the air inlet control servo motor (COROLLA_ZRE142 RM000002Y2101IX.html).

    HINT:
    Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a new or a known good one and check that the condition returns to normal.

  1. Check for the DTC.

    Result:
    Result
    		Proceed to
    DTC B1497/97 is not output
    		A
    DTC B1497/97 is output
    		B


B
Go to step 6
A

END

5.REPLACE AIR OUTLET CONTROL SERVO MOTOR

  1. Replace the air outlet control servo motor (COROLLA_ZRE142 RM000001HLX05GX.html).

    HINT:
    Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a new or a known good one and check that the condition returns to normal.

  1. Check for the DTC.

    Result:
    Result
    		Proceed to
    DTC B1497/97 is not output
    		A
    DTC B1497/97 is output
    		B


B
Go to step 6
A

END

6.REPLACE AIR CONDITIONING HARNESS

  1. Replace the air conditioning harness (COROLLA_ZRE142 RM000001HLX05GX.html).

    HINT:
    Since the air conditioning harness cannot be inspected while it is removed from the vehicle, replace the air conditioning harness with a new or known good one and check that the condition returns to normal.

  1. Check for the DTC.

    Result:
    Result
    		Proceed to
    DTC B1497/97 is not output
    		A
    DTC B1497/97 is output
    		B


B
Go to step 7
A

END

7.CHECK HARNESS AND CONNECTOR (POWER SOURCE)

  1. Disconnect the A/C amplifier connector.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E30-21(B) - Body ground
    		Always
    		11 to 14 V


B
REPAIR OR REPLACE HARNESS OR CONNECTOR
A

REPLACE A/C AMPLIFIER (COROLLA_ZRE142 RM000002XMC01VX.html)