REAR CLIMATE CONTROL UNIT INSPECTION

id074000805500

1. Connect the rear climate control unit connector.

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 rear 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 rear climate control unit.

Terminal voltage table (Reference)

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Terminal

Signal name

Connected to

Measurement condition

Voltage (V)

Inspection item (s)

A

Rear fan control volume

Front climate control unit

Airflow volume control dial

Off

1.0 or less

•  Front climate control unit: terminal voltage (1T)

•  Wiring harness: continuity, short circuit (Front climate control unit—rear climate control unit: 3E—A)

•  Rear climate control unit

1st.

Approx. 1.3

Max HI

Approx. 4.0

B

TNS signal

Front climate control unit

Turn the headlight switch to the off position

1.0 or less

•  Wiring harness: continuity, short circuit (Front climate control unit—rear climate control unit: 3F—B)

•  TNS relay

•  Headlight switch

Turn the headlight switch to the TNS position

B+

C

Rear temperature control volume

Front climate control unit

Temperature control dial: Moving towards COLD

1.0 or less

•  Wiring harness: continuity, short circuit (Front climate control unit—rear airflow mode actuator: 3G—C)

•  Rear climate control unit

•  Front climate control unit: terminal voltage (2B)

Temperature control dial: Moving towards medium temperature

Approx. 2.5

Temperature control dial: Moving towards HOT

Approx. 4.2

D

Panel light control input

Instrument cluster

Turn the headlight switch to the off position

1.0 or less

•  Wiring harness: continuity, short circuit (Rear climate control unit—instrument cluster: D—1I)

•  TNS relay

•  Headlight switch

Turn the headlight switch to the TNS position

B+

E

—

—

—

—

—

F

+5 V

Front climate control unit

Under any condition

5.0

•  Front climate control unit: terminal voltage (3H)

•  Wiring harness: continuity (Front climate control unit—rear climate control unit: 3H—F)

G

Ground

Front climate control unit

Under any condition: Inspect for continuity to ground

1.0 or less

•  Wiring harness: continuity (Front climate control unit—rear climate control unit: 3I—G)

H

—

—

—

—

—

I

—

—

—

—

—

J

Rear climate control unit display

Front climate control unit

Rear control switch on

B+

•  Wiring harness: continuity (Front climate control unit—rear climate control unit: 3C—J)

Rear control switch off

1.0 or less

•  Wiring harness: short circuit (Front climate control unit—rear climate control unit: 3C—J)

•  Front climate control unit: terminal voltage (1W, 1X)

K

—

—

—

—

—

L

—

—

—

—

—

Terminal	Signal name	Connected to	Measurement condition		Voltage (V)	Inspection item (s)
A	Rear fan control volume	Front climate control unit	Airflow volume control dial	Off	1.0 or less	• Front climate control unit: terminal voltage (1T) • Wiring harness: continuity, short circuit (Front climate control unit—rear climate control unit: 3E—A) • Rear climate control unit
				1st.	Approx. 1.3
				Max HI	Approx. 4.0
B	TNS signal	Front climate control unit	Turn the headlight switch to the off position		1.0 or less	• Wiring harness: continuity, short circuit (Front climate control unit—rear climate control unit: 3F—B) • TNS relay • Headlight switch
B	TNS signal	Front climate control unit	Turn the headlight switch to the TNS position		B+
C	Rear temperature control volume	Front climate control unit	Temperature control dial: Moving towards COLD		1.0 or less	• Wiring harness: continuity, short circuit (Front climate control unit—rear airflow mode actuator: 3G—C) • Rear climate control unit • Front climate control unit: terminal voltage (2B)
			Temperature control dial: Moving towards medium temperature		Approx. 2.5
			Temperature control dial: Moving towards HOT		Approx. 4.2
D	Panel light control input	Instrument cluster	Turn the headlight switch to the off position		1.0 or less	• Wiring harness: continuity, short circuit (Rear climate control unit—instrument cluster: D—1I) • TNS relay • Headlight switch
D	Panel light control input	Instrument cluster	Turn the headlight switch to the TNS position		B+
E	—	—	—		—	—
F	+5 V	Front climate control unit	Under any condition		5.0	• Front climate control unit: terminal voltage (3H) • Wiring harness: continuity (Front climate control unit—rear climate control unit: 3H—F)
G	Ground	Front climate control unit	Under any condition: Inspect for continuity to ground		1.0 or less	• Wiring harness: continuity (Front climate control unit—rear climate control unit: 3I—G)
H	—	—	—		—	—
I	—	—	—		—	—
J	Rear climate control unit display	Front climate control unit	Rear control switch on		B+	• Wiring harness: continuity (Front climate control unit—rear climate control unit: 3C—J)
J	Rear climate control unit display	Front climate control unit	Rear control switch off		1.0 or less	• Wiring harness: short circuit (Front climate control unit—rear climate control unit: 3C—J) • Front climate control unit: terminal voltage (1W, 1X)
K	—	—	—		—	—
L	—	—	—		—	—