Toyota Tundra. Manual — part 2405

OK:

The display is as specified in the normal condition.

Result

RESULT REFERENCE

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)

Air Outlet Servo Pulse

(D)

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

FACE: 9 (pulse)
B/L: 32 (pulse)
FOOT: 56 (pulse)
FOOT/DEF: 83
(pulse)
DEF: 97 (pulse)

-

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

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

DTC B1445/45 PASSENGER SIDE COOL AIR BYPASS DAMPER CONTROL

DESCRIPTION

HINT:

Although the tester title says "Passenger Side", there is only one cool air bypass servo motor on this vehicle.

The cool air bypass 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
cool air bypass servo motor to any position. As a result, when the air conditioner is operating, the temperature
of the air blowing toward the passenger's head area 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

DTC

DTC Detection Condition

Trouble Area

B1445/45

Cool air bypass servo motor
position sensor value does not
change even if air conditioning
amplifier operates cool air bypass
servo motor



Cool air bypass servo motor



Air conditioning harness



Air conditioning amplifier

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra

Fig. 61: Passenger Side Cool Air Bypass Damper Control - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. READ VALUE USING TECHSTREAM (COOL AIR BYPASS 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

Cool Air Bypass

Pulse

Cool air bypass servo motor target
pulse/Min.: 8
Max.: 50

Open: 8 (pulse)
Close: 50 (pulse)

-

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

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 COOL AIR BYPASS SERVO MOTOR (for Passenger Side)

a. Temporarily replace the cool air bypass 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 (COOL AIR BYPASS 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

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

DESCRIPTION

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra