B1497

HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1497/97: BUS IC Communication Malfunction
B1497/97 - BUS IC Communication Malfunction

DESCRIPTION

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





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 power switch on (IG).

(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, proceed to the next step.

Result:





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

2. SYSTEM CHECK

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

Result:





B -- REPLACE AIR INLET CONTROL SERVO MOTOR

C -- REPLACE AIR OUTLET CONTROL SERVO MOTOR

D -- REPLACE AIR MIX CONTROL SERVO MOTOR (FOR DRIVER SIDE)
A -- Continue to next step.

3. REPLACE AIR MIX CONTROL SERVO MOTOR (FOR FRONT PASSENGER SIDE)

(a) Replace the air mix control servo motor (for front passenger side) 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 MIX CONTROL SERVO MOTOR (FOR DRIVER SIDE)

(a) Replace the air mix control servo motor (for driver side) 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

7. 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 a known good one and check that the condition returns to normal.

(b) Check for the DTC.

Result:





B -- CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

A -- END

8. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

(a) Disconnect the air conditioning amplifier assembly connector.





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

Standard Voltage:





Text in Illustration





B -- REPAIR OR REPLACE HARNESS OR CONNECTOR

A -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal