Infiniti QX56 (JA60). Manual - part 109

BCS

BCM (BODY CONTROL MODULE)

BCS-55

< ECU DIAGNOSIS >

[BCM]

C

D

E

F

G

H

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K

L

B

A

O

P

N

B2191: DIFFERENCE OF KEY

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SEC-34

B2192: ID DISCORD BCM-ECM

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SEC-35

B2193: CHAIN OF BCM-ECM

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SEC-37

B2552: INTELLIGENT KEY

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SEC-39

B2590: NATS MALFUNCTION

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SEC-40

C1708: [NO DATA] FL

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WT-14

C1709: [NO DATA] FR

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WT-14

C1710: [NO DATA] RR

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—

—

WT-14

C1711: [NO DATA] RL

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WT-14

C1712: [CHECKSUM ERR] FL

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WT-16

C1713: [CHECKSUM ERR] FR

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WT-16

C1714: [CHECKSUM ERR] RR

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WT-16

C1715: [CHECKSUM ERR] RL

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WT-16

C1716: [PRESSDATA ERR] FL

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WT-18

C1717: [PRESSDATA ERR] FR

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WT-18

C1718: [PRESSDATA ERR] RR

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WT-18

C1719: [PRESSDATA ERR] RL

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WT-18

C1720: [CODE ERR] FL

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WT-16

C1721: [CODE ERR] FR

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WT-16

C1722: [CODE ERR] RR

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WT-16

C1723: [CODE ERR] RL

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WT-16

C1724: [BATT VOLT LOW] FL

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WT-16

C1725: [BATT VOLT LOW] FR

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WT-16

C1726: [BATT VOLT LOW] RR

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WT-16

C1727: [BATT VOLT LOW] RL

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—

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WT-16

C1729: VHCL SPEED SIG ERR

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—

—

WT-19

C1735: IGNITION SIGNAL

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—

WT-20

CONSULT display

Fail-safe

Intelligent Key 

warning lamp ON

Tire pressure 

monitor warning 

lamp ON

Reference page

BCS-56

< SYMPTOM DIAGNOSIS >

[BCM]

COMBINATION SWITCH SYSTEM SYMPTOMS

SYMPTOM DIAGNOSIS

COMBINATION SWITCH SYSTEM SYMPTOMS

Symptom Table

INFOID:0000000005146435

1. Perform the data monitor of CONSULT-III to check for any malfunctioning item.
2. Check the malfunction combinations.

Malfunction item: 

×

3. Identify the malfunctioning part from the agreed combination and repair or replace the part.

Data monitor item

Malfunction combi-

nation

TURN SIG

NAL R

TURN SIGNAL L

H

I BEAM SW

HEAD LAMP SW 

1

HEAD LAMP SW 

2

TA

IL

 LA

MP 

SW

P

ASSI

N

G

 SW

AU

T

O

 LI

GH

T

 S

W

FR F

O

G 

SW

FR WI

PER HI

FR WIP

ER LOW

FR WI

PER INT

F

R

 W

A

SH

ER

 S

W

INT VOL

U

ME

RR

 WIPE

R

 O

N

RR WIP

E

R INT

RR W

ASHER 

SW

×

×

×

×

A

×

×

×

×

B

×

×

×

×

C

×

×

×

×

D

×

×

×

E

×

×

×

F

×

×

×

×

G

×

×

×

H

×

×

×

×

I

×

×

×

×

J

Combinations other than those above

K

All Items

L

If only one item is detected or the item is not applicable to the combinations A to L

M

Malfunction 

combination

Malfunctioning part

Repair or replace

A

Combination switch INPUT 1 circuit

Inspect the combination switch input circuit applicable to the malfunctioning 
part. Refer to 

BCS-35, "Diagnosis Procedure"

.

B

Combination switch INPUT 2 circuit

C

Combination switch INPUT 3 circuit

D

Combination switch INPUT 4 circuit

E

Combination switch INPUT 5 circuit

F

Combination switch OUTPUT 1 circuit

Inspect the combination switch output circuit applicable to the malfunction-
ing part. Refer to 

BCS-37, "Diagnosis Procedure"

.

G

Combination switch OUTPUT 2 circuit

H

Combination switch OUTPUT 3 circuit

I

Combination switch OUTPUT 4 circuit

J

Combination switch OUTPUT 5 circuit

K

Light and turn signal switch or front wip-
er and washer switch

Refer to 

BCS-38, "Description"

.

L

BCM

Replace BCM. Refer to 

BCS-59, "Removal and Installation"

.

M

Light and turn signal switch or front wip-
er and washer switch

Replace the switch that cannot be operated.

BCS

PRECAUTIONS

BCS-57

< PRECAUTION >

[BCM]

C

D

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PRECAUTION

PRECAUTIONS

Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT 
PRE-TENSIONER"

INFOID:0000000005384312

The Supplemental Restraint System such as “AIR BAG” and “SEAT BELT PRE-TENSIONER”, used along

with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain

types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS

system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front

air bag, depending on the severity of a collision and whether the front occupants are belted or unbelted.

Information necessary to service the system safely is included in the SR and SB section of this Service Man-

ual.

WARNING:

• To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in

the event of a collision which would result in air bag inflation, all maintenance must be performed by

an authorized NISSAN/INFINITI dealer.

• Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal

injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag

Module, see the SR section.

• Do not use electrical test equipment on any circuit related to the SRS unless instructed to in this

Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harnesses or har-

ness connectors.

PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS

WARNING:

• When working near the Airbag Diagnosis Sensor Unit or other Airbag System sensors with the Igni-

tion ON or engine running, DO NOT use air or electric power tools or strike near the sensor(s) with a

hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing

serious injury.

• When using air or electric power tools or hammers, always switch the Ignition OFF, disconnect the

battery, and wait at least 3 minutes before performing any service.

Precaution Necessary for Steering Wheel Rotation After Battery Disconnect

INFOID:0000000005282709

NOTE:

• This Procedure is applied only to models with Intelligent Key system and NATS (NISSAN ANTI-THEFT SYS-

TEM).

• Remove and install all control units after disconnecting both battery cables with the ignition knob in the

″LOCK″ position.

• Always use CONSULT-III to perform self-diagnosis as a part of each function inspection after finishing work.

If DTC is detected, perform trouble diagnosis according to self-diagnostic results.

For models equipped with the Intelligent Key system and NATS, an electrically controlled steering lock mech-

anism is adopted on the key cylinder.

For this reason, if the battery is disconnected or if the battery is discharged, the steering wheel will lock and

steering wheel rotation will become impossible.

If steering wheel rotation is required when battery power is interrupted, follow the procedure below before

starting the repair operation.

OPERATION PROCEDURE

1. Connect both battery cables.

NOTE:

Supply power using jumper cables if battery is discharged.

2. Use the Intelligent Key or mechanical key to turn the ignition switch to the 

″ACC″ position. At this time, the

steering lock will be released.

3. Disconnect both battery cables. The steering lock will remain released and the steering wheel can be

rotated.

4. Perform the necessary repair operation.

BCS-58

< PRECAUTION >

[BCM]

PRECAUTIONS

5. When the repair work is completed, return the ignition switch to the 

″LOCK″ position before connecting

the battery cables. (At this time, the steering lock mechanism will engage.)

6. Perform a self-diagnosis check of all control units using CONSULT-III.