Infiniti QX56 (JA60). Manual - part 636

INL-72

< ECU DIAGNOSIS >

BCM (BODY CONTROL MODULE)

DTC Inspection Priority Chart

INFOID:0000000005337693

If some DTCs are displayed at the same time, perform inspections one by one based on the following priority

chart.

DTC Index

INFOID:0000000005337694

NOTE:

Details of time display

• CRNT: Displays when there is a malfunction now or after returning to the normal condition until turning igni-

tion switch OFF 

→ ON again.

• 1 - 39: Displayed if any previous malfunction is present when current condition is normal. It increases like 1

→ 2 → 3...38 → 39 after returning to the normal condition whenever ignition switch OFF → ON. The counter

remains at 39 even if the number of cycles exceeds it. It is counted from 1 again when turning ignition switch

OFF 

→ ON after returning to the normal condition if the malfunction is detected again.

Display contents of CONSULT

Fail-safe

Cancellation

U1000: CAN COMM CIRCUIT

Inhibit engine cranking

When the BCM re-establishes communication with the other mod-
ules.

Priority

DTC

1

• U1000: CAN COMM CIRCUIT

2

• B2190: NATS ANTENNA AMP
• B2191: DIFFERENCE OF KEY
• B2192: ID DISCORD BCM-ECM
• B2193: CHAIN OF BCM-ECM
• B2013: STRG COMM 1
• B2552: INTELLIGENT KEY
• B2590: NATS MALFUNCTION

3

• C1729: VHCL SPEED SIG ERR
• C1735: IGNITION SIGNAL

4

• C1708: [NO DATA] FL
• C1709: [NO DATA] FR
• C1710: [NO DATA] RR
• C1711: [NO DATA] RL
• C1712: [CHECKSUM ERR] FL
• C1713: [CHECKSUM ERR] FR
• C1714: [CHECKSUM ERR] RR
• C1715: [CHECKSUM ERR] RL
• C1716: [PRESSDATA ERR] FL
• C1717: [PRESSDATA ERR] FR
• C1718: [PRESSDATA ERR] RR
• C1719: [PRESSDATA ERR] RL
• C1720: [CODE ERR] FL
• C1721: [CODE ERR] FR
• C1722: [CODE ERR] RR
• C1723: [CODE ERR] RL
• C1724: [BATT VOLT LOW] FL
• C1725: [BATT VOLT LOW] FR
• C1726: [BATT VOLT LOW] RR
• C1727: [BATT VOLT LOW] RL

CONSULT display

Fail-safe

Intelligent Key 

warning lamp ON

Tire pressure 

monitor warning 

lamp ON

Reference page

No DTC is detected.
further testing
may be required.

—

—

—

—

U1000: CAN COMM CIRCUIT

—

—

—

BCS-32

B2190: NATS ANTENNA AMP

—

—

—

SEC-31

 

BCM (BODY CONTROL MODULE)

INL-73

< ECU DIAGNOSIS >

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B2191: DIFFERENCE OF KEY

—

—

—

SEC-34

B2192: ID DISCORD BCM-ECM

—

—

—

SEC-35

B2193: CHAIN OF BCM-ECM

—

—

—

SEC-37

B2552: INTELLIGENT KEY

—

—

—

SEC-39

B2590: NATS MALFUNCTION

—

—

—

SEC-40

C1708: [NO DATA] FL

—

—

—

WT-14

C1709: [NO DATA] FR

—

—

—

WT-14

C1710: [NO DATA] RR

—

—

—

WT-14

C1711: [NO DATA] RL

—

—

—

WT-14

C1712: [CHECKSUM ERR] FL

—

—

—

WT-16

C1713: [CHECKSUM ERR] FR

—

—

—

WT-16

C1714: [CHECKSUM ERR] RR

—

—

—

WT-16

C1715: [CHECKSUM ERR] RL

—

—

—

WT-16

C1716: [PRESSDATA ERR] FL

—

—

—

WT-18

C1717: [PRESSDATA ERR] FR

—

—

—

WT-18

C1718: [PRESSDATA ERR] RR

—

—

—

WT-18

C1719: [PRESSDATA ERR] RL

—

—

—

WT-18

C1720: [CODE ERR] FL

—

—

—

WT-16

C1721: [CODE ERR] FR

—

—

—

WT-16

C1722: [CODE ERR] RR

—

—

—

WT-16

C1723: [CODE ERR] RL

—

—

—

WT-16

C1724: [BATT VOLT LOW] FL

—

—

—

WT-16

C1725: [BATT VOLT LOW] FR

—

—

—

WT-16

C1726: [BATT VOLT LOW] RR

—

—

—

WT-16

C1727: [BATT VOLT LOW] RL

—

—

—

WT-16

C1729: VHCL SPEED SIG ERR

—

—

—

WT-19

C1735: IGNITION SIGNAL

—

—

—

WT-20

CONSULT display

Fail-safe

Intelligent Key 

warning lamp ON

Tire pressure 

monitor warning 

lamp ON

Reference page

INL-74

< SYMPTOM DIAGNOSIS >

INTERIOR LIGHTING SYSTEM SYMPTOMS

SYMPTOM DIAGNOSIS

INTERIOR LIGHTING SYSTEM SYMPTOMS

Symptom Table

INFOID:0000000005146751

CAUTION:

Perform the self-diagnosis with CONSULT-III before the symptom diagnosis. Perform the trouble diag-

nosis if any DTC is detected.

Symptom

Possible cause

Inspection item

All of the following lamps do not turn ON
• Front room/map lamp assembly
• Personal lamp 2nd and 3rd row
• Cargo room lamp
• Front and rear step lamps 
• Vanity mirror lamps
• Ignition keyhole illumination
• Puddle lamps
• Foot  lamps

• Harness between BCM and each 

interior room lamp

• BCM

Battery saver output/power supply 
circuit
Refer to 

INL-17

.

Some or all of the following interior room lamps do not 
turn ON/OFF
• Puddle lamps
• Front room/map lamp assembly
• Personal lamp 2nd row
• Personal lamp 3rd row

• Harness between BCM and each 

door switch

• Harness between BCM and each 

interior room lamp

• BCM

Door switch circuit
Refer to 

DLK-71

.

Interior room lamp control circuit
Refer to 

INL-19

.

Some or all of the following lamps do not turn ON/OFF
• Front step lamps
• Rear step lamps
• Foot  lamps

• Harness between BCM and step 

lamps and foot lamps

• BCM

Step lamp circuit
Refer to 

INL-22

.

Cargo lamp does not turn ON/OFF

• Harness between BCM and cargo 

lamp

• BCM

Cargo lamp control circuit
Refer to 

INL-24

.

Ignition keyhole illumination does not turn ON/OFF

• Harness between BCM and ignition 

keyhole illumination

• BCM

Ignition keyhole illumination control 
circuit
Refer to 

INL-26

.

Interior room lamp timer does not activate.
(It turns ON/ OFF when the door opens/closes.)

—

Check the interior room lamp setting.
Refer to 

BCS-19, "INT LAMP : CON-

SULT-III Function (BCM - INT 
LAMP)"

.

Interior room lamp battery saver does not activate.

—

Check the interior room lamp battery 
saver setting.
Refer to 

BCS-26, "BATTERY SAVER 

: CONSULT-III Function (BCM - BAT-
TERY SAVER)"

.

PRECAUTIONS

INL-75

< PRECAUTION >

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PRECAUTION

PRECAUTIONS

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

INFOID:0000000005221511

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:0000000005221512

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.