DTC B1442: Air Inlet Damper Control Servo Motor Circuit [12/2019 - 10/2022]: Procedure

1. Check for DTCs.

   Body Electrical > Air Conditioner > Trouble Codes 

   Result

   Result	Proceed to
   DTC B1497 is not output	A
   DTC B1497 is output	B

Result: 

B 

GO TO DTC B1497. Refer to  DTC B1497: Communication Malfunction (Bus Ic) [12/2019 - 10/2022] 

Result: 

A 

See step  2

1. Check for DTCs.

   Body Electrical > Air Conditioner > Trouble Codes 

   Result

   Result	Proceed to
   DTC B1441, B1446 and B1448 are not output	A
   DTC B1441, B1446 or B1448 is output	B

Result: 

B 

REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY. Refer to  DISASSEMBLY [12/2019 - 10/2022] 

Result: 

A 

See step  3

1. Check that the No. 1 blower damper servo sub-assembly is installed correctly.

   OK

   No. 1 blower damper servo sub-assembly is installed correctly.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REINSTALL NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY. Refer to  REASSEMBLY [12/2019 - ] 

Result: 

OK 

See step  4

1. 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.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REMOVE PINCHED WIRE HARNESS 

Result: 

OK 

See step  5

1. Disconnect the No. 1 air conditioning radiator damper servo sub-assembly connector.
2. Disconnect the No. 1 blower damper servo sub-assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A-6 (STE2) - B-3 (sigB)	Always	Below 1 Ω
   A-5 (STE1) - B-2 (sigA)	Always	Below 1 Ω
   A-8 (M-) - B-5 (M-)	Always	Below 1 Ω
   A-7 (M+) - B-4 (M+)	Always	Below 1 Ω
   A-4 (GND) - B-1 (GND)	Always	Below 1 Ω
   A-6 (STE2) or B-3 (sigB) - Other terminals and Body ground	Always	10 kΩ or higher
   A-5 (STE1) or B-2 (sigA) - Other terminals and Body ground	Always	10 kΩ or higher
   A-8 (M-) or B-5 (M-) - Other terminals and Body ground	Always	10 kΩ or higher
   A-7 (M+) or B-4 (M+) - Other terminals and Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE AIR CONDITIONING HARNESS ASSEMBLY. Refer to  DISASSEMBLY [12/2019 - 10/2022] 

Result: 

OK 

See step  6

1. Remove the No. 1 blower damper servo sub-assembly.

   Refer to DISASSEMBLY [12/2019 - ]

2. Operate the dampers by hand.

   OK

   The dampers are easily operated by hand.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY. Refer to  DISASSEMBLY [12/2019 - ] 

Result: 

NG 

REPAIR OR REPLACE BLOWER ASSEMBLY