Toyota Sequoia (2005). Manual - part 637

I28836

Integration Control
and Panel

PSW

L–B

R–Y

R–Y

4

A4
A/C Pressure Switch

I19

C

4

6

IA5

1

J3
J/C

From
HTR Fuse

L–B

C

Dual

–

DIAGNOSTICS

AIR CONDITIONING SYSTEM

DI–2343

2537

WIRING DIAGRAM

I29010

Pressure switch:

A4

DI–2344

–

DIAGNOSTICS

AIR CONDITIONING SYSTEM

2538

INSPECTION PROCEDURE

1

Check refrigerant pressure.

(a)

Set the manifold gauge.

(b)

Read the manifold gauge pressure when these conditions are established.
Test conditions:

Temperature at the air inlet with the switch set at RECIRC is 30 to 35

°

C (86 to 95

°

F)

Engine running at 1,500 rpm

Blower speed control switch at ”HI” position

Temperature control dial at ”COOL” position

Air conditioning switch ON

Fully open doors

Standard:
Pressure on high pressure side:
1.37 to 1.57 MPa (13.9 to 16.0 kgf

⋅

cm

2

, 198 to 228 psi)

HINT:
If the refrigerant pressure is below 196 KPa (2.0 kgf

⋅

cm

2

, 28 psi), the refrigerant amount the air conditioning

cycle may have decreased significantly for reasons such as a gas leakage.

NG

Check air conditioning cycle
(See page 

AC–3

).

OK

2

Check air conditioning operation.

(a)

Disconnect the pressure switch connector.

(b)

Connect terminals 1 and 4 of the connector of the pres-
sure switch on the vehicle wire harness side using a ser-
vice wire.

(c)

Start the engine.

(d)

Turn the air conditioning switch is on and check that the
magnet clutch is turned on.

(e)

Check that the magnet clutch is turned off when discon-
necting terminals 1 and 4 (that are connected in the prior
step).
OK:
Terminals 1 and 4 connected: magnet clutch is on
Terminals 1 and 4 disconnected: magnet clutch is off

NG

Go to step 3.

OK

–

DIAGNOSTICS

AIR CONDITIONING SYSTEM

DI–2345

2539

Replace pressure switch.

3

Check harness and connector between pressure switch and integration control
and panel (See page 

IN–35

).

Result:

NG

A

OK (Checking from the PROBLEM SYMPTOMS TABLE)

B

OK (Checking from the DTC)

C

A

Repair or replace harness or connector.

B

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

DI–2304

).

OK

Replace integration control and panel.

4

(V)

1

TP terminal 

voltage

0

100 %

(Cool)

(Hot)

Damper opening angle

I28837

A17
Air Mix Control
Servomotor (Front)

5

L–R

4

3

22

15

12

S5–AM

TP

SG–TP

Integration Control
and Panel

I20

R–Y

G–R

VZ

PT

GND

I20

I20

DI–2346

–

DIAGNOSTICS

AIR CONDITIONING SYSTEM

2540

DTC

31

Front Air Mix Damper Position Sensor Cir-
cuit

CIRCUIT DESCRIPTION

This sensor detects the position of the air mix damper and
sends the appropriate signals to the integration control and
panel.
The position sensor is built into the air mix damper control ser-
vomotor assembly.

DTC No.

Detection Item

Trouble Area

31

Short to ground or short to power source circuit in front air mix

Front air mix damper position sensor

Harness or connector between front air mix damper position

31

Short to ground or short to  ower source circuit in front air mix

damper position sensor circuit.

Harness or connector between front air mix dam er  osition

sensor and integration control and panel

Integration control and panel

WIRING DIAGRAM

DI3FF–10