Infiniti FX35, FX50 (S51). Manual - part 489

BACK DOOR OPENER SWITCH OPERATION SIGNAL CIRCUIT

DLK-79

< DTC/CIRCUIT DIAGNOSIS >

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BACK DOOR OPENER SWITCH OPERATION SIGNAL CIRCUIT

Description

INFOID:0000000005239563

BCM detects condition of the back door opener switch and transmits to back door control unit.

Component Function Check

INFOID:0000000005239564

1.

CHECK FUNCTION

Check back door opener switch (“TR/BD OPEN SW”) in “Data Monitor” mode using CONSULT-III.

Is the inspection result normal?

YES

>> Back door opener switch is OK.

NO

>> Refer to 

DLK-86, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000005239565

1.

CHECK BACK DOOR CONTROL UNIT INPUT SIGNAL

1.

Turn ignition switch OFF.

2.

Disconnect back door control unit.

3.

Check voltage between back door control unit harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 2.

2.

CHECK BACK DOOR CONTROL UNIT CIRCUIT

1.

Disconnect BCM connector.

2.

Check continuity between back door control unit harness connector and BCM harness connector. 

3.

Check continuity between BCM harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace harness.

3.

CHECK BCM OUTPUT SIGNAL

1.

Connect BCM connector.

2.

Check voltage between BCM harness connector and ground.

Monitor item

Condition

TR/BD OPEN SW

Back door opener switch is pressed: ON

Back door opener switch is released: OFF

(+)

(–)

Condition

Voltage (V)

(Approx.)

Back door control unit

Connector

Terminal

D123

6

Ground

Back door opener 

switch

Not pressed

Battery voltage  

Pressed

0

Back door control unit

BCM

Continuity 

Connector

Terminal

Connector

Terminal

D123

6

M121

48

Existed

BCM

Ground

Continuity 

Connector

Terminal

M121

48

Not existed

DLK-80

< DTC/CIRCUIT DIAGNOSIS >

BACK DOOR OPENER SWITCH OPERATION SIGNAL CIRCUIT

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Replace BCM. Refer to 

BCS-83, "Removal and Installation"

.

4.

CHECK INTERMITTENT INCIDENT

Refer to

GI-36, "Intermittent Incident"

.

>> INSPECTION END

(+)

(–)

Condition

Voltage (V)

(Approx.)

BCM

Connector

Terminal

M121

48

Ground

Back door opener 

switch

Not pressed

Battery voltage  

Pressed

0

KEY CYLINDER SWITCH

DLK-81

< DTC/CIRCUIT DIAGNOSIS >

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KEY CYLINDER SWITCH

Description

INFOID:0000000005239566

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:0000000005239567

1.

CHECK DOOR KEY CYLINDER SWITCH INPUT SIGNAL

Check (“KEY CYL LK-SW”, “KEY CYL UN-SW”) in “DATA MONITOR” mode for “POWER DOOR LOCK SYS-
TEM” using CONSULT-III. Refer to 

DLK-53, "DOOR LOCK : CONSULT-III Function (BCM - DOOR LOCK)"

.

Is the inspection result normal?

YES

>> Key cylinder switch is OK.

NO

>> Refer to 

DLK-81, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000005239568

1.

CHECK DOOR KEY CYLINDER SWITCH INPUT SIGNAL

1.

Turn ignition switch OFF.

2.

Disconnect front door lock assembly (driver side).

3.

Check voltage between front door lock assembly (driver side) harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK DOOR KEY CYLINDER SIGNAL CIRCUIT

1.

Disconnect power window main switch connector.

2.

Check continuity between power window main switch harness connector and front door lock assembly
(driver side) harness connector.

3.

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

(+)

(–)

Voltage (V)

(Approx.)

Front door lock assembly (driver side)

Connector

Terminal 

D15

5

Ground

5

6

Power window main switch

Front door lock assembly (driver side)

Continuity

Connector

Terminal

Connector

Terminal

D8

4

D15

6

Existed

6

5

DLK-82

< DTC/CIRCUIT DIAGNOSIS >

KEY CYLINDER SWITCH

Is the inspection result normal?

YES

>> Replace power window main switch. Refer to 

PWC-136, "Removal and Installation"

.

NO

>> Repair or replace harness.

3.

CHECK DOOR KEY CYLINDER SWITCH GROUND CIRCUIT

Check continuity between front door lock assembly (driver side) 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-82, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace front door lock assembly (driver side). Refer to 

DLK-248, "DOOR ASSEMBLY : Removal

and Installation"

.

5.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000005239569

COMPONENT INSPECTION

1.

CHECK DOOR KEY CYLINDER SWITCH

1.

Turn ignition switch OFF.

2.

Disconnect front door lock assembly (driver side) (key cylinder switch) terminals.

3.

Check front door lock assembly (driver side) (key cylinder switch) terminals.

Is the inspection result normal?

YES

>> Door key cylinder switch is OK.

NO

>> Replace front door lock assembly (driver side). Refer to 

DLK-248, "DOOR ASSEMBLY : Removal

and Installation"

.

Power window main switch

Ground

Continuity 

Connector

Terminal

D8

4

Not existed

6

Front door lock assembly (driver side)

Ground

Continuity 

Connector

Terminal

D15

4

Existed

Terminal

Key position

Continuity

Front door lock assembly (driver side) connector

5 

4

Unlock

Existed

Neutral / Lock

Not existed

6

Lock

Existed

Neutral / Unlock

Not existed