B1442

HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System): B1442/42: Air Inlet Damper Control Servo Motor Circuit
B1442/42 - Air Inlet Damper Control Servo Motor Circuit

DESCRIPTION

The damper servo (air inlet control) sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal, reverse) based on the signals to move the air inlet damper to any position, which controls the intake air settings (FRESH, FRESH/RECIRCULATION, and RECIRCULATION). The A/C amplifier communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness.

HINT
Confirm that no mechanical problem is present 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 R/F (Recirculation/Fresh) switch.

(e) Enter the following menus: Body / 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. INSPECT 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 known good one and check that the condition returns to normal.

(b) Check for DTCs.

Result:





B -- REPLACE AIR INLET CONTROL SERVO MOTOR Disassembly
A -- Continue to next step.

3. INSPECT 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 known good one and check that the condition returns to normal.

(b) Check for DTCs.

Result:





B -- REPLACE AIR CONDITIONING HARNESS Disassembly

A -- REPLACE AIR CONDITIONING AMPLIFIER Removal