DTC B1442/42: Air Inlet Damper Control Servo Motor Circuit [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 recirculation/fresh 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 Inlet Damper Targ Pulse	No. 1 blower damper servo sub-assembly (air inlet) target pulse / Min.: 0, Max.: 255	RECIRCULATION: 7 (pulse) FRESH: 28 (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. 1 blower damper servo sub-assembly (air inlet) (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 B1442/42 is output	A
   DTC B1442/42 is not output	B

Result: 

B 

END (NO. 1 BLOWER 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 B1442/42 is output	A
   DTC B1442/42 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)