CLIMATE CONTROL UNIT INSPECTION [MANUAL AIR CONDITIONER (MZ-CD 1.6 (Y6))]

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1. Install the PJB.

2. Turn the ignition switch to the ON position.

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

4. By inserting the positive (+) lead of the tester into each climate control unit terminal, 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, replace the climate control unit.

Terminal Voltage Table (Reference)

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Terminal

Signal name

Connected to

Measurement condition

Voltage (V)

Inspection item (s)

A

—

—

—

—

—

B

—

—

—

—

—

C

—

—

—

—

—

D

B+

ROOM 15 A fuse

Under any condition

B+

•  Wiring harness: continuity, short circuit (Climate control unit— fuse: D—ROOM 15 A)

•  ROOM 15 A fuse

E

—

—

—

—

—

F

IG2

A/C 10 A fuse

IG SW ON

B+

•  Wiring harness: continuity, short circuit (Climate control unit— fuse: F—A/C 10 A)

•  A/C 10 A fuse

IG SW LOCK

1.0 or less

•  Wiring harness: continuity, short circuit (Climate control unit— fuse: F—A/C 10 A)

G

—

—

—

—

—

H

—

—

—

—

—

I

—

—

—

—

—

J

GND

Body ground

Under any condition

1.0 or less

•  Wiring harness: continuity (Climate control unit—GND: J—GND)

K

PTC heater operation

PJB

Airflow volume control dial at 1st, temperature control dial to MAX HOT

1.0 or less

•  Wiring harness: Short circuit (Climate control unit—PJB:K—J-03 X)

Airflow volume control dial OFF

B+

•  Wiring harness: Continuity, short circuit (Climate control unit—PJB: K—J-03 X)

•  PJB

L

—

—

—

—

—

M

A/C

PJB

A/C switch ON, airflow volume control dial at 1st

1.0 or less

•  Wiring harness: short circuit (Climate control unit—PJB: M—J-04 AF)

A/C switch OFF

B+

•  Wiring harness: continuity, short circuit (Climate control unit—PJB: M—J-04 AF)

•  PJB

N

—

—

—

—

—

O

Motor operation

Air intake actuator

Switched to RECIRCULATE

1.0 or less

•  Wiring harness: continuity, short circuit (Climate control unit—air intake actuator: S—G, O—E)

•  Air intake actuator

Switched to FRESH

12

P

Rear window defroster switch indicator light

PJB

Rear window defroster switch ON

1.0 or less

•  Wiring harness: continuity (Climate control unit—PJB: P—J-04 I)

•  PJB

Rear window defroster switch OFF

4.0

•  Wiring harness: short circuit (Climate control unit—PJB: P—J-04 I)

•  PJB

Q

Motor operation

Air intake actuator

Switched to RECIRCULATE

12

•  Wiring harness: continuity, short circuit (Climate control unit—air intake actuator: Q—C, S—G)

•  Air intake actuator

Switched to FRESH

1.0 or less

R

Rear window defroster switch

PJB

Rear window defroster switch is pressed

1.0 or less

•  Climate control unit: terminal voltage (J)

Rear window defroster switch is released

B+

•  Wiring harness: open circuit, short circuit (Climate control unit—PJB: R—J-04 AD)

•  PJB

S

Motor operation

Air intake actuator

Switched to RECIRCULATE

12

•  Wiring harness: continuity, short circuit (Climate control unit—air intake actuator: S—G, O—E, Q—C)

•  Air intake actuator

Switched to FRESH

1.0 or less

T

FAN signal

Airflow volume control dial

Airflow volume control dial ON

1.0 or less

•  Wiring harness: continuity (Climate control unit—airflow volume control dial: T—A)

•  Airflow volume control dial

Airflow volume control dial OFF

4.4

•  Wiring harness: continuity (Climate control unit—airflow volume control dial: T—A)

•  Climate control unit: terminal voltage (F)

•  Airflow volume control dial

U

TNS signal

PJB

Headlight switch OFF

1.0 or less

•  Wiring harness: continuity (Climate control unit—PJB: U—J-02 AD)

•  PJB

•  Climate control unit: terminal voltage (V)

Headlight switch ON

1.0 or less

•  Wiring harness: short circuit (Climate control unit—PJB: U—J-02 AD)

V

TNS signal

PJB

Headlight switch OFF

1.0 or less

•  Wiring harness: short circuit (Climate control unit—PJB: V—J-02 R)

•  PJB

•  Headlight switch

Headlight switch ON

B+

•  Wiring harness: continuity, short circuit (Climate control unit—PJB: V—J-02R)

•  PJB

•  Headlight switch

W

—

—

—

—

—

X

—

—

—

—

—

Terminal	Signal name	Connected to	Measurement condition	Voltage (V)	Inspection item (s)
A	—	—	—	—	—
B	—	—	—	—	—
C	—	—	—	—	—
D	B+	ROOM 15 A fuse	Under any condition	B+	• Wiring harness: continuity, short circuit (Climate control unit— fuse: D—ROOM 15 A) • ROOM 15 A fuse
E	—	—	—	—	—
F	IG2	A/C 10 A fuse	IG SW ON	B+	• Wiring harness: continuity, short circuit (Climate control unit— fuse: F—A/C 10 A) • A/C 10 A fuse
F	IG2	A/C 10 A fuse	IG SW LOCK	1.0 or less	• Wiring harness: continuity, short circuit (Climate control unit— fuse: F—A/C 10 A)
G	—	—	—	—	—
H	—	—	—	—	—
I	—	—	—	—	—
J	GND	Body ground	Under any condition	1.0 or less	• Wiring harness: continuity (Climate control unit—GND: J—GND)
K	PTC heater operation	PJB	Airflow volume control dial at 1st, temperature control dial to MAX HOT	1.0 or less	• Wiring harness: Short circuit (Climate control unit—PJB:K—J-03 X)
K	PTC heater operation	PJB	Airflow volume control dial OFF	B+	• Wiring harness: Continuity, short circuit (Climate control unit—PJB: K—J-03 X) • PJB
L	—	—	—	—	—
M	A/C	PJB	A/C switch ON, airflow volume control dial at 1st	1.0 or less	• Wiring harness: short circuit (Climate control unit—PJB: M—J-04 AF)
M	A/C	PJB	A/C switch OFF	B+	• Wiring harness: continuity, short circuit (Climate control unit—PJB: M—J-04 AF) • PJB
N	—	—	—	—	—
O	Motor operation	Air intake actuator	Switched to RECIRCULATE	1.0 or less	• Wiring harness: continuity, short circuit (Climate control unit—air intake actuator: S—G, O—E) • Air intake actuator
O	Motor operation	Air intake actuator	Switched to FRESH	12
P	Rear window defroster switch indicator light	PJB	Rear window defroster switch ON	1.0 or less	• Wiring harness: continuity (Climate control unit—PJB: P—J-04 I) • PJB
P	Rear window defroster switch indicator light	PJB	Rear window defroster switch OFF	4.0	• Wiring harness: short circuit (Climate control unit—PJB: P—J-04 I) • PJB
Q	Motor operation	Air intake actuator	Switched to RECIRCULATE	12	• Wiring harness: continuity, short circuit (Climate control unit—air intake actuator: Q—C, S—G) • Air intake actuator
Q	Motor operation	Air intake actuator	Switched to FRESH	1.0 or less
R	Rear window defroster switch	PJB	Rear window defroster switch is pressed	1.0 or less	• Climate control unit: terminal voltage (J)
R	Rear window defroster switch	PJB	Rear window defroster switch is released	B+	• Wiring harness: open circuit, short circuit (Climate control unit—PJB: R—J-04 AD) • PJB
S	Motor operation	Air intake actuator	Switched to RECIRCULATE	12	• Wiring harness: continuity, short circuit (Climate control unit—air intake actuator: S—G, O—E, Q—C) • Air intake actuator
S	Motor operation	Air intake actuator	Switched to FRESH	1.0 or less
T	FAN signal	Airflow volume control dial	Airflow volume control dial ON	1.0 or less	• Wiring harness: continuity (Climate control unit—airflow volume control dial: T—A) • Airflow volume control dial
T	FAN signal	Airflow volume control dial	Airflow volume control dial OFF	4.4	• Wiring harness: continuity (Climate control unit—airflow volume control dial: T—A) • Climate control unit: terminal voltage (F) • Airflow volume control dial
U	TNS signal	PJB	Headlight switch OFF	1.0 or less	• Wiring harness: continuity (Climate control unit—PJB: U—J-02 AD) • PJB • Climate control unit: terminal voltage (V)
U	TNS signal	PJB	Headlight switch ON	1.0 or less	• Wiring harness: short circuit (Climate control unit—PJB: U—J-02 AD)
V	TNS signal	PJB	Headlight switch OFF	1.0 or less	• Wiring harness: short circuit (Climate control unit—PJB: V—J-02 R) • PJB • Headlight switch
V	TNS signal	PJB	Headlight switch ON	B+	• Wiring harness: continuity, short circuit (Climate control unit—PJB: V—J-02R) • PJB • Headlight switch
W	—	—	—	—	—
X	—	—	—	—	—