DTC B1449/49: Rear Air Outlet Damper Control Servo Motor Circuit: Procedure

1. Connect Techstream to the DLC3.
2. Turn the ignition switch on (IG) and turn Techstream main switch on.
3. Select the items below in the Data List, and read the value displayed on Techstream.
   DATA LIST / AIR CONDITIONER
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Air Outlet Servo Pulse(R)	Rear air outlet control servo motor target pulse / Min.: 0, Max.: 255	Rr FACE: 82 (pulse) Rr B/L: 38 (pulse) Rr FOOT: 7 (pulse)	-

   OK

   The display is as specified in the normal condition column.

   Result

   Result	Proceed to
   NG	A
   OK (Checking from PROBLEM SYMPTOMS TABLE)	B
   OK (Checking from DTC)	C

B → See step   4 

C → See step   5 

A: Go to next step 

1. Disconnect the N12 rear air conditioning harness connector.
   Fig 1: Checking Harness And Connector (Rear Air Conditioning Harness - Air Conditioning Amplifier)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the D38 amplifier connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   N12-2 (RBUG) - D38-21 (RBUG)	Always	Below 1 Ω
   N12-3 (RBUS) - D38-1 (RBUS)	Always	Below 1 Ω
   N12-4 (RBBU) - D38-23 (RBBU)	Always	Below 1 Ω
   D38-21 (RBUG) - Body ground	Always	10 kΩ or higher
   D38-1 (RBUS) - Body ground	Always	10 kΩ or higher
   D38-23 (RBBU) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Replace the rear air outlet control servo motor. Refer to REMOVAL .

NEXT: Go to next step 

1. Clear the DTC. Refer to DTC CHECK / CLEAR .
2. Check for DTC. Refer to DTC CHECK / CLEAR .

   OK

   DTC B1449/49 is not output.

NG → REPAIR OR REPLACE REAR AIR CONDITIONING HARNESS 

OK → END (REAR AIR OUTLET CONTROL SERVO MOTOR IS DEFECTIVE)