DTC B1447: Air Mix Damper Control Servo Motor Circuit (Rear) [12/2019 - 11/2023]: Procedure

1. Check for DTCs.

   Body Electrical > Air Conditioner > Trouble Codes 

   Result

   Result	Proceed to
   DTC B149A is not output	A
   DTC B149A is output	B

Result: 

B 

GO TO DTC B149A. Refer to  DTC B149A: Communication Malfunction (Rear Bus Ic) [12/2019 - 11/2023] 

Result: 

A 

See step  2

1. Check that the rear air mix damper servo sub-assembly is installed correctly.

   OK

   Rear air mix damper servo sub-assembly is installed correctly.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REINSTALL REAR AIR MIX DAMPER SERVO SUB-ASSEMBLY. Refer to  REASSEMBLY [12/2019 - ] 

Result: 

OK 

See step  3

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  4

1. Remove the rear air mix 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 REAR AIR MIX DAMPER SERVO SUB-ASSEMBLY. Refer to  DISASSEMBLY [12/2019 - ] 

Result: 

NG 

REPAIR OR REPLACE REAR COOLING UNIT ASSEMBLY