DESCRIPTION
- B1441: The No. 1 air conditioning radiator damper servo sub-assembly
(front passenger side air mix) sends pulse signals to inform the air
conditioning amplifier assembly of the damper position. The air
conditioning amplifier assembly activates the motor (normal or reverse)
based on these signals to move the No. 1 air conditioning radiator
damper servo sub-assembly (front passenger side air mix) 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 output air. The air conditioning amplifier assembly communicates
with the servo through a communication/driver IC and wiring assembly
called the air conditioning harness assembly.
- B1443: The No. 1 air conditioning radiator damper servo sub-assembly
(mode) sends pulse signals to inform the air conditioning amplifier
assembly of the damper position. The air conditioning amplifier assembly
activates the motor (normal or reverse) based on these signals to move
the air outlet damper to the appropriate position, which controls the
air outlet switching. The air conditioning amplifier assembly
communicates with the servo through a communication/driver IC and wiring
assembly called the air conditioning harness assembly.
- B1446: The No. 1 air conditioning radiator damper servo sub-assembly
(driver side air mix) sends pulse signals to inform the air conditioning
amplifier assembly of the damper position. The air conditioning
amplifier assembly activates the motor (normal or reverse) based on
these signals to move the No. 1 air conditioning radiator damper servo
sub-assembly (driver side air mix) to the appropriate 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 driver 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.
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
Memory | B1441 |
Air Mix Damper Control Servo Motor Circuit (Passenger Side) |
Air
mix damper position sensor value does not change even if air
conditioning amplifier assembly operates No. 1 air conditioning radiator
damper servo sub-assembly (front passenger side air mix) |
- No. 1 air conditioning radiator damper servo sub-assembly (front passenger side air mix)
- Air conditioning harness assembly
- Air conditioning amplifier assembly
- Air conditioning radiator assembly
| Memorized (30 sec. or more)* |
B1443 | Air Outlet Damper Control Servo Motor Circuit |
Air
outlet damper position sensor value does not change even if air
conditioning amplifier assembly operates No. 1 air conditioning radiator
damper servo sub-assembly (mode) |
- No. 1 air conditioning radiator damper servo sub-assembly (mode)
- Air conditioning harness assembly
- Air conditioning amplifier assembly
- Air conditioning radiator assembly
| Memorized (30 sec. or more)* |
B1446 | Air Mix Damper Control Servo Motor Circuit (Driver Side) |
Air
mix damper position sensor value does not change even if air
conditioning amplifier assembly operates No. 1 air conditioning radiator
damper servo sub-assembly (driver side air mix) |
- No. 1 air conditioning radiator damper servo sub-assembly (driver side air mix)
- Air conditioning harness assembly
- Air conditioning amplifier assembly
- Air conditioning radiator assembly
| Memorized (30 sec. or more)* |
- *: The air conditioning amplifier assembly stores this DTC if the
malfunction has occurred for the period of time indicated in the
brackets.
DTC Detection Condition Combination Table |
Vehicle Condition |
Pattern 1 | Pattern 2 |
Diagnosis Condition | No. 1 air conditioning radiator damper servo sub-assembly operating |
○ | ○ |
Malfunction | Damper servo operation request signals are output but the damper position sensor value does not change |
○ | - |
Damper servo operation request signals are output but the damper position sensor value is abnormal |
- | ○ |
Detection Time | Continuously for 30 seconds or more |
Continuously for 30 seconds or more |
Trip Count | 1 trip |
1 trip | HINT: If the conditions of either of these patterns are detected, a DTC will be stored. WIRING DIAGRAM
CAUTION / NOTICE / HINT
HINT:
- Confirm that no mechanical problems are present because this DTC can be
stored when either a damper link or damper is mechanically locked.
- When installing a damper servo motor, make sure to install it correctly.
Click here
- After replacing a damper servo motor, make sure to perform Servo Motor Initialization.
Click here
PROCEDURE (a) Check for DTCs. Body Electrical > Air Conditioner > Trouble Codes
Result | Proceed to |
Only B1497 is output |
A | B1441, B1442, B1443 and B1446 are output |
B | B1441, B1443 or B1446 is output |
C |
A |
| GO TO DTC B1497 |
B |
| REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY |
C |
| |
2. |
INSPECT NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (INSTALLATION CONDITION) |
(a) Check that the No. 1 air conditioning radiator damper servo sub-assembly is installed correctly.
OK: The No. 1 air conditioning radiator damper servo sub-assembly is installed correctly.
NG |
| INSTALL NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY CORRECTLY |
OK |
| |
3. |
INSPECT NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (MOTOR, LINK, DAMPER) |
(a) Check for a wire harness caught between the links of the motors and dampers.
OK: No wire harnesses are caught between the links of the motors and dampers.
NG |
| REMOVE PINCHED WIRE HARNESS |
OK |
| |
4. |
INSPECT AIR CONDITIONING RADIATOR ASSEMBLY (DAMPER) |
(a) Remove the No. 1 air conditioning radiator damper servo sub-assembly.
Click here (b) Operate the dampers by hand.
OK: The dampers are easily operated by hand.
OK |
| REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY |
NG |
| REPLACE AIR CONDITIONING RADIATOR ASSEMBLY | |