Last Modified: 11-29-2007 1.6 C
Service Category: Vehicle Interior Section: Heating/Air Conditioning
Model Year: 2008 Model: Sequoia Doc ID: RM000002VXJ004X
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: DESCRIPTION (2008 Sequoia)

DTC

B1443/43

Air Outlet Damper Control Servo Motor Circuit

DESCRIPTION

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

HINT:

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

DTC Code

DTC Detection Condition

Trouble Area

B1443/43

Air outlet damper position sensor value does not change even if air conditioning amplifier operates air outlet servo motor
  • Cooling unit damper servo sub-assembly (Air outlet damper servo)
  • Air conditioning harness
  • Air conditioning amplifier

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1.

READ VALUE USING TECHSTREAM (AIR OUTLET SERVO MOTOR TARGET PULSE)

(a) Connect the Techstream to the 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 (D).

(e) According to the display on the Techstream, read the Data List.

Air Conditioner

Tester Display

Measurement Item / Range

Normal Condition

Diagnostic Note

Air Outlet Servo Pulse (D)

Air outlet servo motor target pulse /

Min.: 0

Max.: 255

Customized value will be displayed

-

OK:

The display is as specified in the normal condition.

Result

Result

Proceed to

NG

A

OK (When troubleshooting according to Problem Symptoms Table)

B

OK (When troubleshooting according to the DTC output)

C
A

4.

REPLACE COOLING UNIT DAMPER SERVO SUB-ASSEMBLY (AIR OUTLET DAMPER SERVO)

(a) Temporarily replace the cooling unit damper servo sub-assembly with a new one HEATING / AIR CONDITIONING: FRONT AIR CONDITIONING UNIT: DISASSEMBLY (2008 Sequoia) .

HINT:

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

NEXT

5.

CHECK FOR DTC

(a) Clear the DTC HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: DTC CHECK / CLEAR (2008 Sequoia) .

(b) Check for DTC HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: DTC CHECK / CLEAR (2008 Sequoia) .

OK:

DTC is not output.

OK

7.

REPAIR OR REPLACE AIR CONDITIONING HARNESS

(a) Repair or replace the air conditioning harness HEATING / AIR CONDITIONING: FRONT AIR CONDITIONING UNIT: DISASSEMBLY (2008 Sequoia) .

NEXT

8.

CHECK FOR DTC

(a) Clear the DTC HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: DTC CHECK / CLEAR (2008 Sequoia) .

(b) Check for DTC again HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: DTC CHECK / CLEAR (2008 Sequoia) .

OK:

DTC is not output.

OK