CLIMATE CONTROL UNIT INSPECTION [MANUAL AIR CONDITIONER]

id0740a2802200

1. Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

2. Remove the following parts:

(1) Front scuff plate (driver’s side) (See FRONT SCUFF PLATE REMOVAL/INSTALLATION.)

(2) Front side trim (driver’s side) (See FRONT SIDE TRIM REMOVAL/INSTALLATION.)

(3) Bonnet release lever (See BONNET RELEASE LEVER AND RELEASE CABLE REMOVAL/INSTALLATION.)

(4) Fuel-filler lid opener and lever (See FUEL-FILLER LID OPENER AND LEVER REMOVAL/INSTALLATION.)

(5) Driver-side lower panel (See DRIVER-SIDE LOWER PANEL REMOVAL/INSTALLATION.)

(6) Center console tray (See CENTER CONSOLE TRAY REMOVAL/INSTALLATION.)

(7) Shift bezel (See SHIFT BEZEL REMOVAL/INSTALLATION.)

(8) Upper panel (See UPPER PANEL REMOVAL/INSTALLATION.)

(9) Shift lever knob (MTX) (See MANUAL TRANSAXLE SHIFT MECHANISM REMOVAL/INSTALLATION [F65M-R].)(See MANUAL TRANSAXLE SHIFT MECHANISM REMOVAL/INSTALLATION [F66M-R].)

(10) Select lever knob (ATX) (See AUTOMATIC TRANSAXLE SHIFT MECHANISM REMOVAL/INSTALLATION.)

(11) Shift panel (See SHIFT PANEL REMOVAL/INSTALLATION.)

(12) Console side panel (See CONSOLE SIDE PANEL REMOVAL/INSTALLATION.)

(13) Front console box (See FRONT CONSOLE BOX REMOVAL/INSTALLATION.)

(14) CD player (with CD player) (See CD PLAYER REMOVAL.) (See CD PLAYER INSTALLATION.)

(15) DVD/CD player (with DVD/CD player) (See DVD/CD PLAYER REMOVAL.) (See DVD/CD PLAYER INSTALLATION.)

(16) Front console (See FRONT CONSOLE REMOVAL/INSTALLATION.)

(17) Side wall (See SIDE WALL REMOVAL/INSTALLATION.)

(18) Rear console (See REAR CONSOLE REMOVAL/INSTALLATION.)

(19) Glove compartment (See GLOVE COMPARTMENT REMOVAL/INSTALLATION.)

(20) Center panel (See CENTER PANEL REMOVAL/INSTALLATION.)

(21) Center lower panel (See CENTER LOWER PANEL REMOVAL/INSTALLATION.)

3. Remove the climate control unit with the connector connected. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)

4. Switch the ignition ON (engine off or on).

5. Connect the negative (-) lead of the tester to the body ground.

6. By inserting the positive (+) lead of the tester into the climate control unit connector, measure the voltage according to the terminal voltage table.

• If there is any malfunction, inspect the parts under “Inspection item (s)”.

― If the parts under “Inspection item (s)” are found to be normal (except for terminal I), replace the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)

― For terminal I, first try replacing the blower fan controller. If there is still any malfunction, replace the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)

am2zzw00012421

Terminal Voltage Table (RECIRCULATE/FRESH switch type climate control unit) (Reference)

Terminal

Signal name

Connected to

Measurement condition

Voltage (V)

Inspection item(s)

A

Motor operation (RECIRCULATE)

Air intake actuator

Switched to RECIRCULATE

B+

•  Related wiring harness

•  Air intake actuator

Switched to FRESH

1.0 or less

B

Motor operation (FRESH)

Air intake actuator

Switched to RECIRCULATE

1.0 or less

•  Related wiring harness

•  Air intake actuator

Switched to FRESH

B+

C

—

—

—

—

—

D

Illumination (panel light control)

Instrument cluster

Light switch off

1.0 or less

Instrument cluster

Light switch on (TNS position) and panel light control MAX position

1.0 or less

Light switch on (TNS position) and panel light control MIN position

7.84

E

—

—

—

—

—

F

TNS signal

Electrical supply unit (ESU)

Light switch ON

B+

Electrical supply unit (ESU)

Light switch off

1.0 or less

G

A/C switch input

Instrument cluster

Ignition is switched ON (engine off or on) and A/C switch off

4.72

Instrument cluster

Ignition is switched ON (engine off or on) and A/C switch on

1.0 or less

H

B+

•  INTERIOR 15 A

•  ROOM 25 A

Under any condition

B+

•  INTERIOR 15 A

•  ROOM 25 A

I

—

—

—

—

—

J

IG1

C/U IG1 15 A

Ignition is switched ON (engine off or on)

B+

C/U IG1 15 A

Ignition is switched off

1.0 or less

K

GND

Body ground

Under any condition

1.0 or less

Body ground

L

—

—

—

—

—

M

GND

Body ground

Under any condition

1.0 or less

Body ground

N

A/C switch illumination input

Instrument cluster

Ignition is switched ON (engine off or on)

B+

Instrument cluster

O

—

—

—

—

—

P

MAX HOT switch input

Instrument cluster

MAX HOT switch off

4.72

Instrument cluster

MAX HOT switch ON

1.0 or less

Q

Vent position switch

Instrument cluster

Mode dial VENT position

1.0 or less

Instrument cluster

Mode dial is in position other than above

4.72

R

MAX COLD switch input

Instrument cluster

MAX COLD switch off

4.72

Instrument cluster

MAX COLD switch ON

1.0 or less

S

Rear window deffoger switch illumination

Instrument cluster

Rear window deffoger switch off

12.22

Instrument cluster

Rear window deffoger switch ON

1.686

T

Recirculate request signal

Instrument cluster

Ignition is switched ON (engine off or on)

B+

Instrument cluster

Ambient temperature is less than 50 °C

5.0

Ambient temperature is more than 50 °C

1.0 or less

U

Rear window deffoger switch input

Instrument cluster

Ignition is switched ON (engine off or on) and rear window deffoger switch off

4.72

Instrument cluster

Ignition is switched ON (engine off) and rear window deffoger switch on

1.0 or less

V

Deffoger switch input

Instrument cluster

Ignition is switched ON and deffoger mode

1.0 or less

Instrument cluster

Ignition is switched ON (engine off) and except rear window deffoger mode

4.72

W

MS CAN_H

CAN system related module

Terminal used for communication therefore determination based on terminal voltage is not possible.

X

MS CAN_L

CAN system related module

Terminal used for communication therefore determination based on terminal voltage is not possible.

Terminal	Signal name	Connected to	Measurement condition	Voltage (V)	Inspection item(s)
A	Motor operation (RECIRCULATE)	Air intake actuator	Switched to RECIRCULATE	B+	• Related wiring harness • Air intake actuator
Switched to FRESH	1.0 or less
B	Motor operation (FRESH)	Air intake actuator	Switched to RECIRCULATE	1.0 or less	• Related wiring harness • Air intake actuator
Switched to FRESH	B+
C	—	—	—	—	—
D	Illumination (panel light control)	Instrument cluster	Light switch off	1.0 or less	Instrument cluster
Light switch on (TNS position) and panel light control MAX position	1.0 or less
Light switch on (TNS position) and panel light control MIN position	7.84
E	—	—	—	—	—
F	TNS signal	Electrical supply unit (ESU)	Light switch ON	B+	Electrical supply unit (ESU)
Light switch off	1.0 or less
G	A/C switch input	Instrument cluster	Ignition is switched ON (engine off or on) and A/C switch off	4.72	Instrument cluster
Ignition is switched ON (engine off or on) and A/C switch on	1.0 or less
H	B+	• INTERIOR 15 A • ROOM 25 A	Under any condition	B+	• INTERIOR 15 A • ROOM 25 A
I	—	—	—	—	—
J	IG1	C/U IG1 15 A	Ignition is switched ON (engine off or on)	B+	C/U IG1 15 A
Ignition is switched off	1.0 or less
K	GND	Body ground	Under any condition	1.0 or less	Body ground
L	—	—	—	—	—
M	GND	Body ground	Under any condition	1.0 or less	Body ground
N	A/C switch illumination input	Instrument cluster	Ignition is switched ON (engine off or on)	B+	Instrument cluster
O	—	—	—	—	—
P	MAX HOT switch input	Instrument cluster	MAX HOT switch off	4.72	Instrument cluster
MAX HOT switch ON	1.0 or less
Q	Vent position switch	Instrument cluster	Mode dial VENT position	1.0 or less	Instrument cluster
Mode dial is in position other than above	4.72
R	MAX COLD switch input	Instrument cluster	MAX COLD switch off	4.72	Instrument cluster
MAX COLD switch ON	1.0 or less
S	Rear window deffoger switch illumination	Instrument cluster	Rear window deffoger switch off	12.22	Instrument cluster
Rear window deffoger switch ON	1.686
T	Recirculate request signal	Instrument cluster	Ignition is switched ON (engine off or on)	B+	Instrument cluster
Ambient temperature is less than 50 °C	5.0
Ambient temperature is more than 50 °C	1.0 or less
U	Rear window deffoger switch input	Instrument cluster	Ignition is switched ON (engine off or on) and rear window deffoger switch off	4.72	Instrument cluster
Ignition is switched ON (engine off) and rear window deffoger switch on	1.0 or less
V	Deffoger switch input	Instrument cluster	Ignition is switched ON and deffoger mode	1.0 or less	Instrument cluster
Ignition is switched ON (engine off) and except rear window deffoger mode	4.72
W	MS CAN_H	CAN system related module	Terminal used for communication therefore determination based on terminal voltage is not possible.
X	MS CAN_L	CAN system related module	Terminal used for communication therefore determination based on terminal voltage is not possible.

Terminal Voltage Table (RECIRCULATE/FRESH lever type climate control unit) (Reference)

Terminal

Signal name

Connected to

Measurement condition

Voltage (V)

Inspection item(s)

A

—

—

—

—

—

B

—

—

—

—

—

C

—

—

—

—

—

D

Illumination (panel light control)

Instrument cluster

Light switch off

1.0 or less

Instrument cluster

Light switch on (TNS position) and panel light control MAX position

1.0 or less

Light switch on (TNS position) and panel light control MIN position

7.84

E

—

—

—

—

—

F

TNS signal

Electrical supply unit (ESU)

Light switch ON

B+

Electrical supply unit (ESU)

Light switch off

1.0 or less

G

A/C switch input

Instrument cluster

Ignition is switched ON (engine off or on) and A/C switch off

4.72

Instrument cluster

Ignition is switched ON (engine off or on) and A/C switch on

1.0 or less

H

—

—

—

—

—

I

—

—

—

—

—

J

IG1

C/U IG1 15 A

Ignition is switched ON (engine off or on)

B+

C/U IG1 15 A

Ignition is switched off

1.0 or less

K

—

—

—

—

—

L

—

—

—

—

—

M

GND

Body ground

Under any condition

1.0 or less

Body ground

N

A/C switch illumination input

Instrument cluster

Ignition is switched ON (engine off or on)

B+

Instrument cluster

O

—

—

—

—

—

P

—

—

—

—

—

Q

—

—

—

—

—

R

—

—

—

—

—

S

Rear window deffoger switch illumination

Instrument cluster

Rear window deffoger switch off

12.22

Instrument cluster

Rear window deffoger switch ON

1.686

T

—

—

—

—

—

U

Rear window deffoger switch input

Instrument cluster

Ignition is switched ON (engine off or on) and rear window deffoger switch off

4.72

Instrument cluster

Ignition is switched ON (engine off) and rear window deffoger switch on

1.0 or less

V

—

—

—

—

—

W

MS CAN_H

CAN system related module

Terminal used for communication therefore determination based on terminal voltage is not possible.

X

MS CAN_L

CAN system related module

Terminal used for communication therefore determination based on terminal voltage is not possible.