B1449

HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1449/49: Rear Air Outlet Damper Control Servo Motor Circuit

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

DESCRIPTION

The mode rear damper servo sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal or reverse) based on the signals to move the rear air outlet damper to the appropriate position, which controls the air outlet modes.

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





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. READ VALUE USING TECHSTREAM (AIR OUTLET SERVO PULSE (R))
(a) Connect the Techstream to DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Data List / Air Outlet Servo Pulse (R).
(e) According to the display on the Techstream, read the Data List.

Air Conditioner





OK:
The display is as specified in the normal condition.

Result





C -- REPLACE AIR CONDITIONING AMPLIFIER
B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (NO. 2 AIR CONDITIONING HARNESS - AIR CONDITIONING AMPLIFIER)




(a) Disconnect the P9 No. 2 air conditioning harness connector.
(b) Disconnect the H67 air conditioning amplifier connector.
(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





(d) Reconnect the air conditioning amplifier connector.
(e) Reconnect the No. 2 air conditioning harness connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

3. REPLACE MODE REAR DAMPER SERVO
(a) Replace the mode rear damper servo motor Disassembly.

HINT: Since the damper servo cannot be inspected while it is removed from the vehicle, replace the damper servo with a normal one.

NEXT -- Continue to next step.

4. CHECK FOR DTC
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC is not output.

NG -- REPAIR OR REPLACE NO. 2 AIR CONDITIONING HARNESS
OK -- END (MODE REAR DAMPER SERVO IS DEFECTIVE)
5. REPAIR OR REPLACE NO. 2 AIR CONDITIONING HARNESS
(a) Repair or replace No. 2 air conditioning harness Disassembly.
NEXT -- Continue to next step.

6. CHECK FOR DTC
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC is not output.

NG -- REPLACE AIR CONDITIONING AMPLIFIER
OK -- END