DTC B1446/46: Air Mix Damper Control Servo Motor Circuit (Driver Side) [10/2014 - ]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Operate the driver side temperature adjustment switch.
5. Enter the following menus: Body Electrical / Air Conditioner / Data List.
6. Check the value(s) by referring to the table below.
   AIR CONDITIONER
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Air Mix Servo Targ Pulse(D)	No. 2 air conditioning radiator damper servo sub-assembly (air mix (for driver side)) target pulse / Min.: 0, Max.: 255	MAX COLD: 5 (pulse) MAX HOT: 103 (pulse)	-

   OK

   The display is as specified in the normal condition column.

   Result

   Result	Proceed to
   NG	A
   OK (When troubleshooting according to Problem Symptoms Table)	B
   OK (When troubleshooting according to the DTC)	C

Result: 

B 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

(Refer to PROBLEM SYMPTOMS TABLE [10/2014 - 10/2015] or PROBLEM SYMPTOMS TABLE [10/2015 - ] )

Result: 

C 

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY 

(Refer to REMOVAL [10/2014 - ] )

Result: 

A 

See step  2

1. Replace the No. 2 air conditioning radiator damper servo sub-assembly (air mix (for driver side)) (Refer to DISASSEMBLY [10/2014 - ] ).

   HINT: 

   Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a new or known good one and check that the condition returns to normal.

2. Check for DTCs.

   Result

   Result	Proceed to
   DTC B1446/46 is output	A
   DTC B1446/46 is not output	B

Result: 

B 

END (NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY WAS DEFECTIVE) 

Result: 

A 

See step  3

1. Replace the air conditioning harness assembly (Refer to REMOVAL [10/2014 - 10/2015] or REMOVAL [10/2015 - ] ).

   HINT: 

   Since the air conditioning harness assembly cannot be inspected while it is removed from the vehicle, replace the air conditioning harness assembly with a new or known good one and check that the condition returns to normal.

2. Check for DTCs.

   Result

   Result	Proceed to
   DTC B1446/46 is output	A
   DTC B1446/46 is not output	B

Result: 

A 

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY 

(Refer to REMOVAL [10/2014 - ] )

Result: 

B 

END (AIR CONDITIONING HARNESS ASSEMBLY WAS DEFECTIVE)