Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Front Right Air Mix Damper Control Servo Motor Actuator Stuck Off (B145B7F)

Toyota Corolla Cross (2022-2024) Service Manual / Vehicle Interior / Heating / Air Conditioning / Air Conditioning System (for Gasoline Model With Automatic Air Conditioning System) / Front Right Air Mix Damper Control Servo Motor Actuator Stuck Off (B145B7F)

DESCRIPTION

The No. 1 air conditioning radiator damper servo sub-assembly 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.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

B145B7F

Front Right Air Mix Damper Control Servo Motor Actuator Stuck Off

Diagnosis Condition:

  • No. 1 air conditioning radiator damper servo sub-assembly operating

Malfunction Status:

  • Damper servo operation request signals are output but the damper position sensor value does not change or abnormal

Detection Time:

  • Continuously for 30 seconds or more
  • No. 1 air conditioning radiator damper servo sub-assembly
  • Air conditioning harness assembly
  • Air conditioning radiator assembly

Memorized
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

CAUTION / NOTICE / HINT

NOTICE:

  • This DTC is also output for the damper link, damper lock, etc. Before performing inspection, perform servomotor initialization and check that there are no mechanical malfunctions.

    Click here

  • This DTC is also output when servomotor initialization has failed. When servomotor initialization has failed, repair any malfunctions and perform servomotor initialization again.

    Click here

  • If B143B7F is output at the same time, check B143B7F first.

    Click here

PROCEDURE

1.

CHECK 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.

Click here

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

2.

CHECK 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

3.

CHECK 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

    READ NEXT:

     Lost Communication with Front Panel LIN Missing Message (B14B287)

    DESCRIPTION The air conditioning control assembly communicates with the air conditioning amplifier assembly via LIN communication. If a malfunction occurs in the LIN communication system, the air co

     Ambient Temperature Sensor Circuit Short to Ground (P007011)

    DESCRIPTION The thermistor assembly is installed in front of the cooler condenser assembly to detect the ambient temperature, which is used to control the air conditioning system. This sensor is conne

     Ambient Temperature Sensor Circuit Short to Battery or Open (P007015)

    DESCRIPTION The thermistor assembly is installed in front of the cooler condenser assembly to detect the ambient temperature, which is used to control the air conditioning system. This sensor is conne

    SEE MORE:

     Precaution

    PRECAUTION HANDLING PRECAUTIONS FOR SRS AIRBAG SYSTEM CAUTION: This vehicle is equipped with a Supplemental Restraint System (SRS). Failure to carry out service operations in the correct sequence could cause the SRS to unexpectedly deploy during servicing. This may cause a serious accident.

     Definition Of Terms

    DEFINITION OF TERMS Term Definition Monitor description Description of what the TCM monitors and how it detects malfunctions (monitoring purpose and details). Related DTCs Group of diagnostic trouble codes that are ou

    © 2020-2024 Copyright www.tcorollacross.com