AIR CONDITIONING SYSTEM, Diagnostic DTC:B1443/43

DTC Code	DTC Name
B1443/43	Air Outlet Damper Control Servo Motor Circuit

DESCRIPTION

*1: for LHD
*2: for RHD

The mode damper servo motor LH*1 or RH*2 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 the signals to move the mode damper servo motor LH*1 or RH*2 to any position, which controls the air outlet changes.

Tech Tips

Confirm that no mechanical problem is present because this trouble code can be output when either a damper link or damper is mechanically locked.

DTC Code	DTC Detection Condition	Trouble Area
B1443/43	The air outlet damper position does not change even if the air conditioning amplifier assembly operates the air outlet damper servo motor.	Mode damper servo motor LH1 Mode damper servo motor RH2 Air conditioning harness assembly Air conditioning amplifier assembly

WIRING DIAGRAM

PROCEDURE

READ VALUE USING GTS (AIR OUTLET SERVO PULSE [D], AIR OUTLETSERVO ACTU PULSE[D])

Use the Data List to check if the mode damper servo motor LH*1 or RH*2 is functioning properly Click here.

Air Conditioner
Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Air Outlet Servo Pulse (D)	Mode damper servo motor LH1 or RH2 target pulse / Min.: 128, Max.: 383	FACE: 254 (pulse) FACE1: 246 (pulse) FACE2: 254 (pulse) B/L1: 230 (pulse) B/L2: 218 (pulse) FOOT-O: 208 (pulse) FOOT-D: 189 (pulse) FOOT-R: 178 (pulse) FOOT-F: 178 (pulse) FOOT 178 (pulse) F/D: 155 (pulse) DEF: 143 (pulse)	Displayed between 143 and 254 pulse Mode damper servo motor LH1 or RH2 system malfunction
Air Outlet Servo Actu Pulse(D)	Mode damper servo motor LH1 or RH2 actual pulse / Min.: 128, Max.: 383	FACE: 254 (pulse) FACE1: 246 (pulse) FACE2: 254 (pulse) B/L1: 230 (pulse) B/L2: 218 (pulse) FOOT-O: 208 (pulse) FOOT-D: 189 (pulse) FOOT-R: 178 (pulse) FOOT-F: 178 (pulse) FOOT 178 (pulse) F/D: 155 (pulse) DEF: 143 (pulse)	Displayed between 143 and 254 pulse Mode damper servo motor LH1 or RH2 system malfunction

*1: for LHD
*2: for RHD

OK
When the driver side mode switch is turned, the actual pulse changes following the target pulse.

Result
Result	Proceed to
Target pulse changes but actual pulse does not change	A
Target pulse and actual pulse do not change	B
Actual pulse changes following the target pulse (When troubleshooting according to the DTC)	C
Actual pulse changes following the target pulse (When troubleshooting according to Problem Symptoms Table)	D

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

CHECK FOR DTC Click here

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

CHECK MODE DAMPER SERVO MOTOR (for Front Passenger Side)
1. for LHD:
  1. Replace the mode damper servo motor LH Click here.
2. for RHD:
  1. Replace the mode damper servo motor RH Click here.
    
    Tech Tips
    
    Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a normal one.
3. Clear the DTCs Click here.
4. Check for DTCs Click here.
  
  OK
  
  DTC B1443/43 is not output.
OK
END (MODE DAMPER SERVO MOTOR [for Front Passenger Side] WAS DEFECTIVE)

NG
CHECK AIR CONDITIONING HARNESS ASSEMBLY
1. Replace the air conditioning harness assembly with a new or known good one Click here.
2. Clear the DTCs Click here.
3. Check for DTCs Click here.
  
  OK
  
  DTC B1443/43 is not output.
OK
END (AIR CONDITIONING HARNESS ASSEMBLY WAS DEFECTIVE)

NG
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here
CHECK FOR DTC
1. Clear the DTCs Click here.
2. Check for DTCs Click here.
  
  OK
  
  DTC B1443/43 is not output.
OK
USE SIMULATION METHOD TO CHECK Click here

NG
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here