Toyota Sequoia (2005). Manual - part 640

I28839

A17 Air Mix Damper
Control Servomotor (Front)

1

2

10

9

AMH

AMC

Integration Control and Panel

R–L

W–L

I20

MHOT

I20

MCOOL

–

DIAGNOSTICS

AIR CONDITIONING SYSTEM

DI–2355

2549

DTC

41

Front Air Mix Damper Control Servomotor
Circuit

CIRCUIT DESCRIPTION

The front air mix damper control servomotor is controlled by the integration control and panel and moves
the air mix damper to the desired position.

DTC No.

Detection Item

Trouble Area

41

Air mix damper position sensor value does not change even if

integration control and panel operates air mix damper control

servomotor.

Front air mix damper control servomotor

Front air mix damper position sensor

Harness or connector between front air mix position sensor

and integration control and panel

Harness or connector between air mix damper control servo-

motor and integration control and panel

Integration control and panel

WIRING DIAGRAM

DI3FI–15

DI–2356

–

DIAGNOSTICS

AIR CONDITIONING SYSTEM

2550

INSPECTION PROCEDURE

1

Actuator check.

PREPARATION:
(a)

Warm up the engine.

(b)

Set to the actuator check mode (See page 

DI–2303

).

(c)

Press the DEF switch and change it to step operation.

CHECK:
Press the DEF switch and check the operation of the air mix damper and the condition of the blower.
OK:

Display Code

Air Mix Damper

Condition

0 – 3

–14% (Fully closed)

Cool air comes out

4, 5

50%

–

6 – 9

113.5% (Fully opened)

Warm air comes out

HINT:
However, if DTC 41 is displayed, replace the integration control and panel.

OK

Proceed to next circuit inspection shown in
problem symptoms table (See page 

DI–2304

).

NG

I15902

Cool

Warm

–

DIAGNOSTICS

AIR CONDITIONING SYSTEM

DI–2357

2551

2

Check front air mix damper control servomotor.

PREPARATION:
Remove the front air mix servomotor (See page 

AC–86

).

CHECK:
Connect the positive (+) lead to terminal 1 and the negative (–)
lead to terminal 2.
OK:

The lever turns smoothly to the warm side.

CHECK:
Connect the positive (+) lead to terminal 2 and the negative (–)
lead to terminal 1.
OK:

The lever turns smoothly to the cool side.

NG

Replace front air mix servomotor.

OK

3

Check harness and connector between front air mix servomotor and integration
control and panel (See page 

IN–35

).

NG

Repair or replace harness or connector.

OK

Replace integration control and panel.

I28840

A16 Air Inlet Damper
Control Servomotor

5

20

8

AIR

AIF

Integration Control and Panel

G–W

I20

R

4

REC

FRS

I20

DI–2358

–

DIAGNOSTICS

AIR CONDITIONING SYSTEM

2552

DTC

42

Air Inlet Damper Control Servomotor Circuit

CIRCUIT DESCRIPTION

The air inlet damper control servomotor is controlled by the integration control and panel and moves the air
inlet damper to the desired position.

DTC No.

Detection item

Trouble Area

Air inlet damper control servomotor

Air inlet damper position sensor

42

Air inlet damper position sensor value does not change even if

integration control and panel operated air inlet damper control

servomotor

Harness or connector between air inlet damper control servo-

motor and integration control and panel

Harness or connector between air inlet damper position sen-

servomotor.

Harness or connector between air inlet damper position sen-

sor and integration control and panel

Integration control and panel

WIRING DIAGRAM

DI3FJ–14