DTC Code | DTC Name |
---|---|
B1441/41 | Air Mix Damper Control Servo Motor Circuit (Passenger Side) |
DESCRIPTION
The air mix control servo motor (for front passenger side) sends pulse signals to indicate the damper position to the air conditioning amplifier assembly. The air conditioning amplifier assembly activates the motor (normal or reverse) based on these signals to move the air mix control servo motor (for front passenger side) to any position. As a result, the amount of air passing through the heater core after passing through the evaporator is adjusted, and the temperature of the air blowing toward the passenger side is controlled.
The air conditioning amplifier assembly communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness assembly.
Tech Tips
Confirm that no mechanical problem is present because this DTC can be stored when either a damper link or the damper is mechanically locked.
DTC No. | DTC Detection Condition | Trouble Area |
---|---|---|
B1441/41 | Air mix damper position sensor value does not change even if air conditioning amplifier assembly operates air mix control servo motor |
|
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
READ VALUE USING INTELLIGENT TESTER
Connect the intelligent tester to the DLC3.
Turn the power switch on (IG).
Turn the intelligent tester on.
Operate the front passenger side temperature adjustment switch.
Enter the following menus: Body / Air Conditioner / Data List.
Check the value(s) by referring to the table below.
Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
---|---|---|---|
Air Mix Servo Targ Pulse (P) | Front passenger side air mix servo motor target pulse / Min.: 0, Max.: 255 | for LHD: MAX. COLD: 6 (pulse) MAX. HOT: 93 (pulse) for RHD: MAX. COLD: 92 (pulse) MAX. HOT: 5 (pulse) |
- |
Air Mix Servo Actual Pulse (P) | Front passenger side air mix servo motor actual pulse / Min.: 0, Max.: 255 | for LHD: MAX. COLD: 6 (pulse) MAX. HOT: 93 (pulse) for RHD: MAX. COLD: 92 (pulse) MAX. HOT: 5 (pulse) |
- |
OK |
---|
The display is as specified in the Normal Condition column. |
Result | ||||||||
---|---|---|---|---|---|---|---|---|
|
B |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here |
C |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here |
A |
PERFORM ACTIVE TEST USING INTELLIGENT TESTER
Connect the intelligent tester to the DLC3.
Turn the power switch on (IG).
Turn the intelligent tester on.
Enter the following menus: Body / Air Conditioner / Active Test.
Check the operation by referring to the table below.
Tester Display | Test Part | Control Range | Diagnostic Note |
---|---|---|---|
Air Mix Servo Targ Pulse (P) | Air mix servo motor pulse (for front passenger side) | Min.: 0, Max.: 255 | - |
OK |
---|
Air temperature changes in accordance with each control range. |
NG |
INSPECT AIR MIX CONTROL SERVO MOTOR (FOR FRONT PASSENGER SIDE) Click here |
OK |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here
INSPECT AIR MIX CONTROL SERVO MOTOR (FOR FRONT PASSENGER SIDE)
Replace the air mix control servo motor (for front passenger side) Click here.
Tech Tips
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.
Check for the DTC.
Result | ||||||
---|---|---|---|---|---|---|
|
B |
END (AIR MIX CONTROL SERVO MOTOR WAS DEFECTIVE) |
A |
INSPECT AIR CONDITIONING HARNESS ASSEMBLY
Replace the air conditioning harness assembly Click here.
Tech Tips
Since the air conditioning harness assembly cannot be inspected while it is removed from the vehicle, replace the air conditioning harness assembly with a new or a known good one and check that the condition returns to normal.
Check for the DTC.
Result | ||||||
---|---|---|---|---|---|---|
|
B |
END (AIR CONDITIONING HARNESS ASSEMBLY WAS DEFECTIVE) |
A |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here