Infiniti M45 (Y34). Manual - part 155

TROUBLE DIAGNOSIS

ATC-105

C

D

E

F

G

H

I

K

L

M

A

B

ATC

3. 

CHECK IN-VEHICLE SENSOR

Refer to 

ATC-105, "In-Vehicle Sensor"

 .

OK or NG

OK

>> 1. Replace auto amp.

2. Go to self-diagnosis 

ATC-50, "FUNCTION CONFIRMATION PROCEDURE"

  and perform self-

diagnosis STEP-2. Confirm that code No. 20 is displayed.

NG

>> 1. Replace in-vehicle sensor.

2. Go to self-diagnosis 

ATC-50, "FUNCTION CONFIRMATION PROCEDURE"

  and perform self-

diagnosis STEP-2. Confirm that code No. 20 is displayed.

4. 

CHECK CIRCUIT CONTINUITY BETWEEN IN-VEHICLE SENSOR AND AUTO AMP.

1.

Turn ignition switch OFF.

2.

Disconnect auto amp. connector.

3.

Check continuity between in-vehicle sensor harness connector
M68 terminal 2 (LG/B) and auto amp. harness connector M119
terminal 3 (LG/B).

4.

Check continuity between auto amp. harness connector M119
terminal 3 (LG/B) and ground.

OK or NG

OK

>> 1. Replace auto amp.

2. Go to self-diagnosis 

ATC-50, "FUNCTION CONFIRMATION PROCEDURE"

  and perform self-

diagnosis STEP-2. Confirm that code No. 20 is displayed.

NG

>> Repair harness or connector.

COMPONENT INSPECTION
In-Vehicle Sensor

After disconnecting in-vehicle sensor harness connector M68, mea-
sure resistance between terminals 1 and 2 at sensor side, using the
table below.

If NG, replace in-vehicle sensor.

2 – 3

: Continuity should exist.

3 – Ground

: Continuity should not exist.

RJIA3062E

Temperature 

°

C (

°

F)

Resistance k

Ω

−

15 (5)

12.73

−

10 (14)

9.92

−

5 (23)

7.80

0 (32)

6.19

5 (41)

4.95

10 (50)

3.99

15 (59)

3.24

20 (68)

2.65

25 (77)

2.19

30 (86)

1.81

35 (95)

1.51

40 (104)

1.27

45 (113)

1.07

RJIA0253E

ATC-106

TROUBLE DIAGNOSIS

Sunload Sensor Circuit

AJS000CM

COMPONENT DESCRIPTION

The sunload sensor is located on the left defroster grille. It detects
sunload entering through windshield by means of a photo diode. The
sensor converts the sunload into a current value which is then input
into the auto amp.

SUNLOAD INPUT PROCESS

The auto amp. also includes a processing circuit which averages the variations in detected sunload over a
period of time. This prevents drastic swings in the ATC system operation due to small or quick variations in
detected sunload.
For example, consider driving along a road bordered by an occasional group of large trees. The sunload
detected by the sunload sensor will vary whenever the trees obstruct the sunlight. The processing circuit aver-
ages the detected sunload over a period of time, so that the (insignificant) effect of the trees momentarily
obstructing the sunlight does not cause any change in the ATC system operation. On the other hand, shortly
after entering a long tunnel, the system will recognize the change in sunload, and the system will react accord-
ingly.

DIAGNOSTIC PROCEDURE FOR SUNLOAD SENSOR

SYMPTOM: Sunload sensor circuit is open or shorted. (25 or 

−

25) is

indicated on auto amp. as a result of conducting Self-diagnosis
STEP-2.

1. 

CHECK CIRCUIT CONTINUITY BETWEEN SUNLOAD SENSOR AND GROUND

1.

Disconnect sunload sensor connector.

2.

Turn ignition switch ON.

3.

Check voltage between sunload sensor harness connector M44
terminal 1 (SB) and ground.

OK or NG

OK

>> GO TO 2.

NG

>> GO TO 4.

RJIA1309E

RJIA0926E

1 – Ground

: Approx. 5V

RJIA2027E

TROUBLE DIAGNOSIS

ATC-107

C

D

E

F

G

H

I

K

L

M

A

B

ATC

2. 

CHECK CIRCUIT CONTINUITY BETWEEN SUNLOAD SENSOR AND AUTO AMP.

1.

Turn ignition switch OFF.

2.

Disconnect auto amp. connector.

3.

Check continuity between sunload sensor harness connector
M44 terminal 2 (R/Y) and auto amp. harness connector M119
terminal 11 (R/Y).

OK or NG

OK

>> GO TO 3.

NG

>> Repair harness or connector.

3. 

CHECK SUNLOAD SENSOR

Refer to 

ATC-108, "Sunload Sensor"

 .

OK or NG

OK

>> 1. Replace auto amp.

2. Go to self-diagnosis 

ATC-50, "FUNCTION CONFIRMATION PROCEDURE"

  and perform self-

diagnosis STEP-2. Confirm that code No. 20 is displayed.

NG

>> 1. Replace sunload sensor.

2. Go to self-diagnosis 

ATC-50, "FUNCTION CONFIRMATION PROCEDURE"

  and perform self-

diagnosis STEP-2. Confirm that code No. 20 is displayed.

4. 

CHECK CIRCUIT CONTINUITY BETWEEN SUNLOAD SENSOR AND AUTO AMP.

1.

Turn ignition switch OFF.

2.

Disconnect auto amp. connector.

3.

Check continuity between sunload sensor harness connector
M44 terminal 1 (SB) and auto amp. harness connector M119 ter-
minal 12 (SB).

4.

Check continuity between auto amp. harness connector M119
terminal 12 (SB) and ground.

OK or NG

OK

>> 1. Replace auto amp.

2. Go to self-diagnosis 

ATC-50, "FUNCTION CONFIRMATION PROCEDURE"

  and perform self-

diagnosis STEP-2. Confirm that code No. 20 is displayed.

NG

>> Repair harness or connector.

2 – 11

: Continuity should exist.

RJIA3064E

1 – 12

: Continuity should exist.

12 – Ground

: Continuity should not exist.

RJIA3065E

ATC-108

TROUBLE DIAGNOSIS

COMPONENT INSPECTION
Sunload Sensor

Measure voltage between auto amp. harness connector M119 termi-
nal 12 (SB) and ground.
If NG, replace sunload sensor.

●

When checking sunload sensor, select a place where sunshine directly on it.

RJIA1310E

SHA930E