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





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 A/C AMPLIFIER

(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) According to the display on the Techstream, perform the Active Test.

Air Conditioner





OK:

Arm of the 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 ASSEMBLY
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
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 ASSEMBLY

A -- END

4. REPLACE AIR INLET 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 ASSEMBLY

A -- END

5. REPLACE AIR OUTLET 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 ASSEMBLY

A -- END

6. REPLACE AIR CONDITIONING HARNESS ASSEMBLY

(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)

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:





Text in Illustration





B -- REPAIR OR REPLACE HARNESS OR CONNECTOR

A -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal