Air Conditioning System (For Automatic Air Conditioning System)

HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System): B1449/49: Rear Air Outlet Damper Control Servo Motor Circuit
B1449/49 - Rear Air Outlet Damper Control Servo Motor Circuit

DESCRIPTION

The rear air outlet control servo motor sends pulse signals to indicate the damper position to the air conditioning amplifier. The air conditioning amplifier activates the motor (normal or reverse) based on these signals to move the rear air outlet damper to any position, which controls the air outlet modes.

The air conditioning amplifier communicates with the servo through a communication/driver IC and wiring assembly called the rear air conditioning harness.

HINT
Confirm that there are no mechanical problems because this DTC can be output when either a damper link or the damper is mechanically locked.





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Operate the rear side MODE switch.

(e) Enter the following menus: Body Electrical / Air Conditioner / Data List.

(f) Check the value(s) by referring to the table below.

Air Conditioner





OK:

The display is as specified in the Normal Condition column.

Result





C -- REPLACE AIR CONDITIONING AMPLIFIER Removal

B -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Air Conditioning System (For Automatic Air Conditioning System)
A -- Continue to next step.

2. 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:

Air flow position changes in accordance with each control range.

NG -- CHECK HARNESS AND CONNECTOR (REAR AIR CONDITIONING HARNESS - AIR CONDITIONING AMPLIFIER)

OK -- REPLACE AIR CONDITIONING AMPLIFIER Removal

3. CHECK HARNESS AND CONNECTOR (REAR AIR CONDITIONING HARNESS - AIR CONDITIONING AMPLIFIER)

(a) Disconnect the rear air conditioning harness connector.

(b) Disconnect the air conditioning amplifier connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. INSPECT REAR AIR OUTLET CONTROL SERVO MOTOR

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

HINT
Since the rear air outlet control servo motor cannot be inspected while it is removed from the vehicle, replace the rear air outlet control 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 REAR AIR OUTLET CONTROL SERVO MOTOR Disassembly
A -- Continue to next step.

5. INSPECT REAR AIR CONDITIONING HARNESS

(a) Replace the rear air conditioning harness Disassembly.

HINT
Since the rear air conditioning harness cannot be inspected while it is removed from the vehicle, replace the rear 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 -- REPLACE REAR AIR CONDITIONING HARNESS Disassembly

A -- REPLACE AIR CONDITIONING AMPLIFIER Removal