HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for TMC Made, and Gasoline Model, with Automatic Air Conditioning System): B14037F; Front Air Outlet Damper Control Servo Motor Actuator Stuck Off; 2023 MY Corolla Corolla Hatchback GR Corolla [09/2022

Last Modified: 07-31-2024	6.11:8.1.0	Doc ID: RM1000000026Z88
Model Year Start: 2023	Model: GR Corolla	Prod Date Range: [09/2022 - 11/2022]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for TMC Made, and Gasoline Model, with Automatic Air Conditioning System): B14037F; Front Air Outlet Damper Control Servo Motor Actuator Stuck Off; 2023 MY Corolla Corolla Hatchback GR Corolla [09/2022 - 11/2022]

DTC

B14037F

Front Air Outlet Damper Control Servo Motor Actuator Stuck Off

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.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

B14037F

Front Air Outlet Damper Control Servo Motor Actuator Stuck Off

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

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.	○	-
Malfunction	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

for M20A-FKS

for Single Type:

for Dual Type:

for G16E-GTS

for Single Type:

for Dual Type:

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

PROCEDURE

1.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Air Conditioner > Trouble Codes

Result	Proceed to
B14037F is output	A
DTCs in conjunction with No. 1 air conditioning radiator damper servo sub-assembly are output at same time	B

REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

2.	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:

No. 1 air conditioning radiator damper servo sub-assembly is installed correctly.

REINSTALL NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

3.	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.

REMOVE PINCHED WIRE HARNESS

4.	PERFORM ACTIVE TEST USING GTS

(a) Perform the Active Test according to the display on the GTS.

Body Electrical > Air Conditioner > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Front Air Outlet Damper Control Servo Motor

This test activates the front air outlet damper control servo motor.

(No. 1 air conditioning radiator damper servo sub-assembly (front mode))

128: Min

384: Max

Operate with the ignition switch ON.

Body Electrical > Air Conditioner > Data List

Tester Display	Measurement Item	Range	Normal Condition	Inspection Item
Front Air Outlet Damper Control Servo Motor Actual Pulse	No. 1 air conditioning radiator damper servo sub-assembly (front mode) actual pulse	128 to 384	FACE: 256 (pulse) B/L: 267 (pulse) FOOT-A: 288 (pulse) FOOT-R (F): 297 (pulse) FOOT-D: 305 (pulse) F/D-R: 320 (pulse) D/F: 339 (pulse) DEF: 348 (pulse)	No. 1 air conditioning radiator damper servo sub-assembly (front mode) circuit malfunction

Body Electrical > Air Conditioner > Active Test

Active Test Display
Front Air Outlet Damper Control Servo Motor

Data List Display
Front Air Outlet Damper Control Servo Motor Actual Pulse

OK:

The value of the Data List changes in accordance with the operation of the Active Test.

GO TO STEP 8

5.	PERFORM ACTIVE TEST USING GTS

(a) Perform the Active Test according to the display on the GTS.

Body Electrical > Air Conditioner > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Front Air Outlet Damper Control Servo Motor

This test activates the front air outlet damper control servo motor.

(No. 1 air conditioning radiator damper servo sub-assembly (front mode))

128: Min

384: Max

Operate with the ignition switch ON.

Body Electrical > Air Conditioner > Data List

Tester Display	Measurement Item	Range	Normal Condition	Inspection Item
Front Air Outlet Damper Control Servo Motor Target Pulse	No. 1 air conditioning radiator damper servo sub-assembly (front mode) target pulse	128 to 384	FACE: 256 (pulse) B/L: 267 (pulse) FOOT-A: 288 (pulse) FOOT-R (F): 297 (pulse) FOOT-D: 305 (pulse) F/D-R: 320 (pulse) D/F: 339 (pulse) DEF: 348 (pulse)	No. 1 air conditioning radiator damper servo sub-assembly (front mode) circuit malfunction
Front Air Outlet Damper Control Servo Motor Actual Pulse	No. 1 air conditioning radiator damper servo sub-assembly (front mode) actual pulse	128 to 384	FACE: 256 (pulse) B/L: 267 (pulse) FOOT-A: 288 (pulse) FOOT-R (F): 297 (pulse) FOOT-D: 305 (pulse) F/D-R: 320 (pulse) D/F: 339 (pulse) DEF: 348 (pulse)	No. 1 air conditioning radiator damper servo sub-assembly (front mode) circuit malfunction

Body Electrical > Air Conditioner > Active Test

Active Test Display
Front Air Outlet Damper Control Servo Motor

Data List Display
Front Air Outlet Damper Control Servo Motor Target Pulse
Front Air Outlet Damper Control Servo Motor Actual Pulse

OK:

The target pulse value of the Data List matches the actual pulse.

USE SIMULATION METHOD TO CHECK

6.	REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

Click here

7.	PERFORM ACTIVE TEST USING GTS

(a) Perform the Active Test according to the display on the GTS.

Body Electrical > Air Conditioner > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Front Air Outlet Damper Control Servo Motor

This test activates the front air outlet damper control servo motor.

(No. 1 air conditioning radiator damper servo sub-assembly (front mode))

128: Min

384: Max

Operate with the ignition switch ON.

Body Electrical > Air Conditioner > Data List

Tester Display	Measurement Item	Range	Normal Condition	Inspection Item
Front Air Outlet Damper Control Servo Motor Actual Pulse	No. 1 air conditioning radiator damper servo sub-assembly (front mode) actual pulse	128 to 384	FACE: 256 (pulse) B/L: 267 (pulse) FOOT-A: 288 (pulse) FOOT-R (F): 297 (pulse) FOOT-D: 305 (pulse) F/D-R: 320 (pulse) D/F: 339 (pulse) DEF: 348 (pulse)	No. 1 air conditioning radiator damper servo sub-assembly (front mode) circuit malfunction

Body Electrical > Air Conditioner > Active Test

Active Test Display
Front Air Outlet Damper Control Servo Motor

Data List Display
Front Air Outlet Damper Control Servo Motor Actual Pulse

OK:

The value of the Data List changes in accordance with the operation of the Active Test.

END

REPLACE AIR CONDITIONING HARNESS ASSEMBLY

8.	CONFIRM MODEL

Result	Proceed to
for Single Type	A
for Dual Type	B

GO TO STEP 11

9.	PERFORM ACTIVE TEST USING GTS

(a) Perform the Active Test according to the display on the GTS.

Body Electrical > Air Conditioner > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Front Air Mix Damper Control Servo Motor

This test activates the front air mix damper control servo motor.

(No. 1 air conditioning radiator damper servo sub-assembly (air mix))

128: Min

384: Max

Operate with the ignition switch ON.

Body Electrical > Air Conditioner > Data List

Tester Display	Measurement Item	Range	Normal Condition	Inspection Item
Front Air Mix Damper Control Servo Motor Actual Pulse	No. 1 air conditioning radiator damper servo sub-assembly (air mix) actual pulse	128 to 384	MAX COLD: 257 (pulse) MAX HOT: 165 (pulse)	No. 1 air conditioning radiator damper servo sub-assembly (air mix) circuit malfunction

Body Electrical > Air Conditioner > Active Test

Active Test Display
Front Air Mix Damper Control Servo Motor

Data List Display
Front Air Mix Damper Control Servo Motor Actual Pulse

OK:

The value of the Data List changes in accordance with the operation of the Active Test.

GO TO STEP 6

10.	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.

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

REPAIR OR REPLACE AIR CONDITIONING RADIATOR ASSEMBLY

11.	PERFORM ACTIVE TEST USING GTS

(a) Perform the Active Test according to the display on the GTS.

Body Electrical > Air Conditioner > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Front Left Air Mix Damper Control Servo Motor

This test activates the front left air mix damper control servo motor.

(No. 1 air conditioning radiator damper servo sub-assembly (left side air mix))

128: Min

384: Max

Operate with the ignition switch ON.

Body Electrical > Air Conditioner > Data List

Tester Display	Measurement Item	Range	Normal Condition	Inspection Item
Front Left Air Mix Damper Control Servo Motor Actual Pulse	No. 1 air conditioning radiator damper servo sub-assembly (left side air mix) actual pulse	128 to 384	MAX COLD: 257 (pulse) MAX HOT: 165 (pulse)	No. 1 air conditioning radiator damper servo sub-assembly (left side air mix) circuit malfunction

Body Electrical > Air Conditioner > Active Test

Active Test Display
Front Left Air Mix Damper Control Servo Motor

Data List Display
Front Left Air Mix Damper Control Servo Motor Actual Pulse

OK:

The value of the Data List changes in accordance with the operation of the Active Test.

GO TO STEP 6

GO TO STEP 10