Toyota Tundra. Manual — part 2425

a. Repair or replace the air conditioning harness.

5. CHECK FOR DTC

a. Clear the DTC (see DTC CHECK/CLEAR ).

b. Check for DTC again (see DTC CHECK/CLEAR ).

OK:

DTC is not output.

NG: REPLACE AIR CONDITIONING AMPLIFIER (See REMOVAL )

OK: END

DTC B1443/43 AIR OUTLET DAMPER CONTROL SERVO MOTOR CIRCUIT

DESCRIPTION

The mode damper servo motor 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 DETECTION CONDITION CHART

WIRING DIAGRAM

DTC

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



Air outlet servo motor



Air conditioning harness



Air conditioning amplifier

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra

Fig. 123: Air Outlet Damper Control Servo Motor - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

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

a. Use the Data List to check if the servo motor is functioning properly.

Air Conditioner

DATA LIST

OK:

The display is as specified in the normal condition.

Result

RESULT REFERENCE

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic

Note

Air Outlet Servo Pulse

(D)

Air outlet servo motor target
pulse/Min.: 9
Max.: 97

FACE: 9 (pulse)
MID: 25 (pulse)
B/L: 32 (pulse)
MID: 39 (pulse)
FOOT: 56 (pulse)
MID: 77 (pulse)
FOOT/DEF: 83
(pulse)
MID: 91 (pulse)
DEF: 97 (pulse)

-

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra

B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE (See PROBLEM SYMPTOMS TABLE )

C: REPLACE AIR CONDITIONING AMPLIFIER (See REMOVAL )

A: Go to Next Step

2. REPLACE AIR OUTLET SERVO MOTOR

a. Temporarily replace the air outlet servo motor with a new one (see DISASSEMBLY ).

HINT:

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

3. CHECK FOR DTC

a. Clear the DTC (see DTC CHECK/CLEAR ).

b. Check for DTC (see DTC CHECK/CLEAR ).

OK:

DTC is not output.

NG: Go to step 4

OK: END (AIR OUTLET SERVO MOTOR IS DEFECTIVE)

4. REPAIR OR REPLACE AIR CONDITIONING HARNESS

a. Repair or replace the air conditioning harness.

5. CHECK FOR DTC

a. Clear the DTC (see DTC CHECK/CLEAR ).

b. Check for DTC again (see DTC CHECK/CLEAR ).

OK:

DTC is not output.

NG: REPLACE AIR CONDITIONING AMPLIFIER (See REMOVAL )

OK: END

Result

Proceed to

NG

A

OK (Checking from the PROBLEM SYMPTOMS TABLE)

B

OK (Checking from the DTC)

C

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra

DTC B1446/46 AIR MIX DAMPER CONTROL SERVO MOTOR CIRCUIT (DRIVER SIDE)

DESCRIPTION

The air mix damper servo motor (for driver side) 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 mix damper (for driver side) to any position. As a result the amount of air that has passed through
the evaporator and is now passing through the heater core is adjusted, and the temperature of the air blowing
toward the driver side is controlled.

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 DETECTION CONDITION CHART

WIRING DIAGRAM

Fig. 124: Air Mix Damper Control Servo Motor - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. READ VALUE USING TECHSTREAM (AIR MIX SERVO MOTOR TARGET PULSE (for

DTC

DTC Detection Condition

Trouble Area

B1446/46

Air mix damper position sensor
value does not change even if air
conditioning amplifier operates air
mix servo motor



Air mix servo motor (for
driver side)



Air conditioning harness



Air conditioning amplifier

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra