Infiniti G37 Coupe. Manual - part 378

KEY CYLINDER SWITCH

DLK-73

< COMPONENT DIAGNOSIS >

[INTELLIGENT KEY SYSTEM]

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KEY CYLINDER SWITCH

Description

INFOID:0000000001683075

Power window main switch detects condition of the door key cylinder switch and transmits to BCM as the
LOCK or UNLOCK signals. 

Component Function Check

INFOID:0000000001683076

1.

CHECK DOOR KEY CYLINDER SWITCH INPUT SIGNAL

With CONSULT-III

Check key cylinder switch (“KEY CYL LK-SW”, “KEY CYL UN-SW”) in “Data Monitor” mode for “POWER
DOOR LOCK SYSTEM” with CONSULT-III. Refer to 

DLK-51, "DOOR LOCK : CONSULT-III Function (BCM -

DOOR LOCK)"

.

Is the inspection result normal?

YES

>> Key cylinder switch is OK.

NO

>> Refer to 

DLK-73, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000001683077

1.

CHECK DOOR KEY CYLINDER SWITCH INPUT SIGNAL

1.

Turn ignition switch ON.

2.

Check voltage between power window main switch connector and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 2.

2.

CHECK DOOR KEY CYLINDER SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect power window main switch connector and driver side door lock assembly connector.

3.

Check continuity between power window main switch harness connector and driver side door lock assem-
bly harness connector.

4.

Check continuity between power window main switch harness connector and ground.

Monitor item

Condition

KEY CYL LK-SW

Lock

: ON

Neutral / Unlock

: OFF

KEY CYL UN-SW

Unlock

: ON

Neutral / Lock

: OFF

Terminals

Key position

Voltage (V)

(Approx.)

(+)

(–)

Power window main 

switch connector

Terminal 

D8

6

Ground

Lock

0

Neutral / Unlock

5

7

Unlock

0

Neutral / Lock

5

Power window main switch connec-

tor

Terminal

Driver side door lock assembly connector

Terminal

Continuity

D8

6

D15

6

Existed

7

5

DLK-74

< COMPONENT DIAGNOSIS >

[INTELLIGENT KEY SYSTEM]

KEY CYLINDER SWITCH

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace harness.

3.

CHECK DOOR KEY CYLINDER SWITCH GROUND CIRCUIT

Check continuity between driver side door lock assembly harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace harness.

4.

CHECK DOOR KEY CYLINDER SWITCH

Check door key cylinder switch. 
Refer to 

DLK-74, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace driver side door lock assembly. Refer to 

DLK-230, "DOOR LOCK : Removal and Installa-

tion"

.

5.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-38, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000001683078

COMPONENT INSPECTION

1.

CHECK DOOR KEY CYLINDER SWITCH

1.

Turn ignition switch OFF.

2.

Disconnect driver side door lock assembly connector.

3.

Check continuity between driver side door lock assembly terminals.

Is the inspection result normal?

YES

>> Key cylinder switch is OK.

NO

>> Replace driver side door lock assembly. Refer to 

DLK-230, "DOOR LOCK : Removal and Installa-

tion"

. 

Power window main switch connec-

tor

Terminal

Ground

Continuity 

D8

6

Not existed

7

Driver side door lock assembly connector

Terminal

Ground

Continuity 

D15

4

Existed

Terminal

Key position

Continuity

Driver side door lock assembly

5 

4

Unlock

Existed

Neutral / Lock

Not existed

6

Lock

Existed

Neutral / Unlock

Not existed

UNLOCK SENSOR

DLK-75

< COMPONENT DIAGNOSIS >

[INTELLIGENT KEY SYSTEM]

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UNLOCK SENSOR

Description

INFOID:0000000001683080

Detects door lock condition of driver door.

Component Function Check

INFOID:0000000001683081

1.

CHECK FUNCTION

With CONSULT-III

Check unlock sensor (“DOOR STAT SW”) in “Data Monitor” mode with CONSULT-III.

Is the inspection result normal?

YES

>> Unlock sensor is OK.

NO

>> Refer to 

DLK-75, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000001683082

1.

CHECK UNLOCK SENSOR POWER SUPPLY

1.

Turn ignition switch OFF.

2.

Check signal between BCM harness connector and ground with oscilloscope.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 2.

2.

CHECK UNLOCK SENSOR CIRCUIT

1.

Disconnect BCM connector and driver side door lock assembly connector.

2.

Check continuity between BCM harness connector and driver side door lock assembly harness connector.

3.

Check continuity between BCM harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

Monitor item

Condition

DOOR STAT SW

Front door lock (driver side) LOCK: OFF

Front door lock (driver side) UNLOCK: ON

Terminals

Driver side door lock 

condition

Voltage (V)

(Approx.)

(+)

(–)

BCM connector

Terminal

M123

119

Ground

Locked

Unlocked

0

JPMIA0011GB

BCM connector

Terminal

 Driver side door lock assembly 

connector

Terminal

Continuity 

M123

119

D15

3

Existed

BCM connector

Terminal

Ground

Continuity 

M123

119

Not existed

DLK-76

< COMPONENT DIAGNOSIS >

[INTELLIGENT KEY SYSTEM]

UNLOCK SENSOR

NO

>> Repair or replace harness between BCM and driver side door lock assembly.

3.

CHECK UNLOCK SENSOR GROUND CIRCUIT

Check continuity between driver side door lock assembly harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace harness.

4.

CHECK UNLOCK SENSOR 

Refer to 

DLK-76, "Component Inspection"

. 

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace driver side door lock assembly. Refer to 

DLK-230, "DOOR LOCK : Removal and Installa-

tion"

.

5.

CHECK INTERMITTENT INCIDENT 

Refer to 

GI-38, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000001683083

1.

CHECK UNLOCK SENSOR

1.

Turn ignition switch OFF.

2.

Disconnect driver side door lock assembly connector.

3.

Check continuity between unlock sensor terminals.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace driver side lock assembly. Refer to 

DLK-230, "DOOR LOCK : Removal and Installation"

.

Driver side door lock assembly connector

Terminal

Ground

Continuity 

D15

4

Existed

Terminal

Condition

Continuity

Driver side door lock assembly

3

4

Unlock

Existed

Lock

Not existed