B1497

HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System): B1497/97; BUS IC Communication Malfunction; 2013 MY Corolla [07/2012 -]
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.





WIRING DIAGRAM





INSPECTION PROCEDURE

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

PROCEDURE

1. PERFORM ACTIVE TEST USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Air Conditioner / Active test.

(e) Check the operation by referring to the table below.

Air Conditioner





OK:

Arm of the damper servo motor selected in the Active Test moves smoothly.

(f) According to the test result, proceed to the next step.

Result:





B -- REPLACE AIR CONDITIONING HARNESS
A -- Continue to next step.

2. SYSTEM CHECK

(a) According to the test result, proceed to the next step.

Result:





B -- REPLACE AIR INLET CONTROL SERVO MOTOR

C -- REPLACE AIR OUTLET CONTROL SERVO MOTOR
A -- Continue to next step.

3. REPLACE AIR MIX CONTROL SERVO MOTOR

(a) Replace the air mix control servo motor Disassembly.

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.

(b) Check for the DTC.

Result:





B -- REPLACE AIR CONDITIONING HARNESS

A -- END

4. REPLACE AIR INLET CONTROL SERVO MOTOR

(a) Replace the air inlet control servo motor Disassembly.

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.

(b) Check for the DTC.

Result:





B -- REPLACE AIR CONDITIONING HARNESS

A -- END

5. REPLACE AIR OUTLET CONTROL SERVO MOTOR

(a) Replace the air outlet control servo motor Disassembly.

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.

(b) Check for the DTC.

Result:





B -- REPLACE AIR CONDITIONING HARNESS

A -- END

6. REPLACE AIR CONDITIONING HARNESS

(a) Replace the air conditioning harness Disassembly.

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.

(b) Check for the DTC.

Result:





B -- CHECK HARNESS AND CONNECTOR (POWER SOURCE)

A -- END

7. CHECK HARNESS AND CONNECTOR (POWER SOURCE)

(a) Disconnect the A/C amplifier connector.

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

Standard Voltage:





B -- REPAIR OR REPLACE HARNESS OR CONNECTOR

A -- REPLACE A/C AMPLIFIER Removal