Air Conditioning System (For Manual Air Conditioning System)

AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Manual Air Conditioning System): B1447/47: Rear Air Mix Damper Control Servo Motor Circuit
B1447/47 - Rear Air Mix Damper Control Servo Motor Circuit

DESCRIPTION

The rear air mix 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 mix damper to the appropriate position. This adjusts the amount of air passing through the heater core after passing the evaporator and controls the temperature of the blown air.

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





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM

(a) Connect Techstream to the DLC3.

(b) Turn the ignition switch on (IG) and turn Techstream main switch on.

(c) Select the item below in the Data List, and read the value displayed on Techstream.

Data List / Air Conditioner





OK:

The display is as specified in the normal condition column.

Result:





C -- REPLACE AIR CONDITIONING AMPLIFIER Removal

B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Air Conditioning System (for Manual Air Conditioning System)
A -- Continue to next step.

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

(a) Disconnect the N12 rear air conditioning harness connector.





(b) Disconnect the D38 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.

3. REPLACE REAR AIR MIX CONTROL SERVO MOTOR

(a) Replace the rear air mix control servo motor Removal.

NEXT -- Continue to next step.

4. CHECK DTC OUTPUT

(a) Clear the DTC DTC Check / Clear.

(b) Check for DTC DTC Check / Clear.

OK:

DTC B1447/47 is not output.

NG -- REPAIR OR REPLACE REAR AIR CONDITIONING HARNESS

OK -- END (REAR AIR MIX CONTROL SERVO MOTOR IS DEFECTIVE)