2004 INFINITI QX56 ESP

COMBINATION SWITCH
LT-101
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B
LT
Revision: August 20072004 QX56
3. HARNESS INSPECTION
1. Turn ignition switch OFF.
2. Disconnect BCM and combination switch connectors.
3. Check for continuity between BCM harness connector of the suspect system and the corresponding com-
bination switch connector terminals.
4. Check for continuity between each terminal of BCM harness connector in suspect malfunctioning system
and ground.
OK or NG
OK >> GO TO 4.
NG >> Check harness between BCM and combination switch for open or short circuit.
Sus-
pect
systemTe r m i n a l s
Continuity BCM Combination switch
ConnectorTe r m i n a l
(wire color)ConnectorTe r m i n a l
(wire color)
1
M18Input 1 6 (V)
M286 (V)
Ye s Output 1 36 (R/W) 1 (R/W)
2Input 2 5 (G/B) 7 (G/B)
Output 2 35 (O/B) 2 (O/B)
3Input 3 4 (Y) 10 (Y)
Output 3 34 (L) 3 (L)
4Input 4 3 (G/Y) 9 (G/Y)
Output 4 33 (R/Y) 4 (R/Y)
5Input 5 2 (SB) 8 (SB)
Output 5 32 (R/G) 5 (R/G)
Suspect
systemTe r m i n a l s
Continuity BCM
Connector Terminal (wire color)
1
M18Input 1 6 (V)
Ground No Output 1 36 (R/W)
2Input 2 5 (G/B)
Output 2 35 (O/B)
3Input 3 4 (Y)
Output 3 34 (L)
4Input 4 3 (G/Y)
Output 4 33 (R/Y)
5Input 5 2 (SB)
Output 5 32 (R/G)
LKIA0284E

HARNESS CONNECTOR
PG-69
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PG
Revision: August 20072004 QX56
HARNESS CONNECTOR (SLIDE-LOCKING TYPE)

A new style slide-locking type connector is used on certain systems and components, especially those
related to OBD.

The slide-locking type connectors help prevent incomplete locking and accidental looseness or discon-
nection.

The slide-locking type connectors are disconnected by pushing or pulling the slider. Refer to the illustra-
tion below.
CAUTION:

Do not pull the harness or wires when disconnecting the connector.

Be careful not to damage the connector support bracket when disconnecting the connector.
[Example]
AEL299C

RF-4
SQUEAK AND RATTLE TROUBLE DIAGNOSES
Revision: August 20072004 QX56
SQUEAK AND RATTLE TROUBLE DIAGNOSESPFP:00000
Work FlowEIS002WG
CUSTOMER INTERVIEW
Interview the customer if possible, to determine the conditions that exist when the noise occurs. Use the Diag-
nostic Worksheet during the interview to document the facts and conditions when the noise occurs and any
customer comments; refer to RF-8, "
Diagnostic Worksheet" . This information is necessary to duplicate the
conditions that exist when the noise occurs.

The customer may not be able to provide a detailed description or the location of the noise. Attempt to
obtain all the facts and conditions that exist when the noise occurs (or does not occur).

If there is more than one noise in the vehicle, be sure to diagnose and repair the noise that the customer
is concerned about. This can be accomplished by test driving the vehicle with the customer.

After identifying the type of noise, isolate the noise in terms of its characteristics. The noise characteristics
are provided so the customer, service adviser and technician are all speaking the same language when
defining the noise.

Squeak —(Like tennis shoes on a clean floor)
Squeak characteristics include the light contact/fast movement/brought on by road conditions. Hard sur-
faces = higher pitch noise/softer surfaces = lower pitch noises/edge to surface = chirping.

Creak—(Like walking on an old wooden floor)
Creak characteristics include firm contact/slow movement/twisting with a rotational movement/pitch
dependent on materials/often brought on by activity.

Rattle—(Like shaking a baby rattle)
Rattle characteristics include the fast repeated contact/vibration or similar movement/loose parts/missing
clip or fastener/incorrect clearance.

Knock —(Like a knock on a door)
Knock characteristics include hollow sounding/sometimes repeating/often brought on by driver action.

Tick—(Like a clock second hand)
Tick characteristics include gentle contacting of light materials/loose components/can be caused by driver
action or road conditions.

Thump—(Heavy, muffled knock noise)
Thump characteristics include softer knock/dead sound often drought on by activity.

Buzz—(Like a bumble bee)
Buzz characteristics include high frequency rattle/firm contact.

Often the degree of acceptable noise level will vary depending upon the person. A noise that you may
judge as acceptable may be irritating to the customer.

Weather conditions, especially humidity and temperature, may have a great effect on noise level.
SBT 8 42

RFD-6
FRONT OIL SEAL
Revision: August 20072004 QX56
FRONT OIL SEALPFP:38189
Removal and InstallationEDS002JK
REMOVAL
1. Remove the drive shaft inside flange bolts to disconnect the rear drive shafts from the rear final drive.
Support the rear drive shafts using suitable wire.
NOTE:
Disconnecting the rear drive shafts is necessary to measure the total preload accurately.
2. Remove the rear propeller shaft. Refer to PR-8, "
Removal and Installation" .
CAUTION:
Do not damage the propeller shaft tube.
3. Check the total preload. Refer to RFD-12, "
TOTAL PRELOAD" .
4. Put a mark on the end of the drive pinion corresponding to the
position mark “B” on the companion flange as shown.
CAUTION:

Use paint to make the matching mark “B” on the drive
pinion. Never damage the drive pinion.

The mark “B” on the companion flange indicates the
maximum vertical runout position.
5. Remove drive pinion nut using Tool as shown.

Discard the drive pinion nut and use a new drive pinion nut for
installation.
6. Use a suitable puller to remove the companion flange as shown.
SDIA0270E
Tool number : KV40104000 ( — )
LDIA0105E
LDIA0106E

TROUBLE DIAGNOSIS
RSU-7
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G
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RSU
Revision: August 20072004 QX56
TROUBLE DIAGNOSISPFP:00000
How to Perform Trouble Diagnoses for Quick and Accurate RepairEES00113
INTRODUCTION
The rear load leveling air suspension system uses an electronic con-
trol unit to control major functions. The control unit accepts input sig-
nals from the height sensor and controls compressor and exhaust
valve operation.
It is much more difficult to diagnose a rear load leveling air suspen-
sion system problem that occurs intermittently rather than continu-
ously. Most intermittent problems are caused by poor electrical
connections or faulty wiring. In this case, careful checking of suspi-
cious circuits may help prevent the replacement of good parts.
Before undertaking actual checks, take just a few minutes to talk with
a customer who approaches with an air suspension system com-
plaint. The customer is a very good source of information on such
problems, especially intermittent ones. Through discussion with the
customer, find out what symptoms are present and under what con-
ditions they occur.
Start your diagnosis by looking for basic mechanical problems first.
This is one of the best ways to troubleshoot concerns on an air sus-
pension system equipped vehicle. Also check related Service Bulle-
tins for information.
CLARIFY CONCERN

A customer's description of a vehicle concern may vary depend-
ing on the individual. It is important to clarify the customer's con-
cern.

Ask the customer about what symptoms are present under what
conditions. Use this information to reproduce the symptom.
SEF 2 33 G
SEF 2 34 G
SBR3 39 B

SQUEAK AND RATTLE TROUBLE DIAGNOSES
SE-5
C
D
E
F
G
H
J
K
L
MA
B
SE
Revision: August 20072004 QX56
SQUEAK AND RATTLE TROUBLE DIAGNOSESPFP:00000
Work FlowEIS002Y1
CUSTOMER INTERVIEW
Interview the customer if possible, to determine the conditions that exist when the noise occurs. Use the Diag-
nostic Worksheet during the interview to document the facts and conditions when the noise occurs and any
customer's comments; refer to SE-9, "
Diagnostic Worksheet" . This information is necessary to duplicate the
conditions that exist when the noise occurs.

The customer may not be able to provide a detailed description or the location of the noise. Attempt to
obtain all the facts and conditions that exist when the noise occurs (or does not occur).

If there is more than one noise in the vehicle, be sure to diagnose and repair the noise that the customer
is concerned about. This can be accomplished by test driving the vehicle with the customer.

After identifying the type of noise, isolate the noise in terms of its characteristics.The noise characteristics
are provided so the customer, service adviser and technician are all speaking the same language when
defining the noise.

Squeak —(Like tennis shoes on a clean floor)
Squeak characteristics include the light contact/fast movement/brought on by road conditions/hard sur-
faces = higher pitch noise/softer surfaces =lower pitch noises/edge to surface = chirping

Creak—(Like walking on an old wooden floor)
Creak characteristics include firm contact/slow movement/twisting with a rotational movement/pitch
dependent on materials/often brought on by activity.

Rattle—(Like shaking a baby rattle)
Rattle characteristics include the fast repeated contact/vibration or similar movement/loose parts/missing
clip or fastener/incorrect clearance.

Knock —(Like a knock on a door)
Knock characteristics include hollow sounding/sometimes repeating/often brought on by driver action.

Tick—(Like a clock second hand)
Tick characteristics include gentle contacting of light materials/loose components/can be caused by driver
action or road conditions.

Thump—(Heavy, muffled knock noise)
Thump characteristics include softer knock/dead sound often brought on by activity.

Buzz—(Like a bumble bee)
Buzz characteristics include high frequency rattle/firm contact.

Often the degree of acceptable noise level will vary depending upon the person. A noise that you may
judge as acceptable may be very irritating to the customer.

Weather conditions, especially humidity and temperature, may have a great affect on noise level.
SBT 8 42

SRS-32
TROUBLE DIAGNOSIS
Revision: August 20072004 QX56
14. Repair the system as outlined by the “Repair order” in “Intermittent Malfunction Diagnostic Code Chart”,
that corresponds to the self-diagnostic result. For replacement procedure of component parts, refer to the
Removal and Installation procedure for the appropriate component.
15. Go to SRS-28, "
DIAGNOSTIC PROCEDURE 3" , for final checking.
CONSULT-II Diagnostic Code Chart ("SELF-DIAG [PAST]" or "TROUBLE DIAG RECORD")
Diagnostic item ExplanationRepair order
Recheck SRS at each replacement
NO DTC IS DETECTEDWhen malfunction is
indicated by the “AIR
BAG” warning lamp in
User mode.

Low battery voltage (Less than
9V)
Go to SRS-28, "DIAGNOSTIC PRO-
CEDURE 3" .

Self-diagnostic result “SELF-DIAG
[PAST]” (previously stored in the
memory) might not be erased
after repair.

Intermittent malfunction has been
detected in the past.

Go to SRS-30, "DIAGNOSTIC PRO-
CEDURE 4 (CONTINUED FROM
DIAGNOSTIC PROCEDURE 2)" .

Go to SRS-30, "DIAGNOSTIC PRO-
CEDURE 5" .

No malfunction is detected. —
DRIVER AIRBAG MODULE
[OPEN]
[B1049] or [B1054]

Driver air bag module circuit is open (including the spiral
cable).1. Visually check the wiring harness
connection.
2. Replace the harness if it has visible
damage.
3. Replace driver air bag module.
4. Replace the spiral cable.
5. Replace the air bag diagnosis sen-
sor unit.
6. Replace the related harness. DRIVER AIRBAG MODULE
[VB-SHORT]
[B1050] or [B1055]

Driver air bag module circuit is shorted to some power sup-
ply circuit (including the spiral cable).
DRIVER AIRBAG MODULE
[GND-SHORT]
[B1051] or [B1056]

Driver air bag module circuit is shorted to ground (including
the spiral cable).
DRIVER AIRBAG MODULE
[SHORT]
[B1052] or [B1057]

Driver air bag module circuits are shorted to each other.
ASSIST A/B MODULE
[OPEN]
[B1065] or [B1070]

Front passenger air bag module circuit is open. 1. Visually check the wiring harness
connection.
2. Replace the harness if it has visible
damage.
3. Replace front passenger air bag
module.
4. Replace the air bag diagnosis sen-
sor unit.
5. Replace the related harness. ASSIST A/B MODULE
[VB-SHORT]
[B1066] or [B1071]

Front passenger air bag module circuit is shorted to some
power supply circuit.
ASSIST A/B MODULE
[GND-SHORT]
[B1067] or [B1072]

Front passenger air bag module circuit is shorted to
ground.
ASSIST A/B MODULE
[SHORT]
[B1068] or [B1073]

Front passenger air bag module circuits are shorted to
each other.
CRASH ZONE SEN
[UNIT FAIL]
[B1033] or [B1034]
CRASH ZONE SEN
[COMM FAIL]
[B1035]

Crash zone sensor 1. Visually check the wiring harness
connection.
2. Replace the harness if it has visible
damage.
3. Replace the crash zone sensor.
4. Replace the air bag diagnosis sen-
sor unit.
5. Replace the related harness.

TF-126
FRONT CASE
Revision: August 20072004 QX56
2. Remove shift rod components together with 2-4 sleeve and L-H
sleeve.
3. Remove the shift cross from the front case.
4. Remove 2-4 sleeve and L-H sleeve from 2-4 fork and L-H fork
respectively.
5. Drive out retaining pin from shift rod, using suitable pin punch.
6. Remove L-H fork, 2-4 fork, shift fork spring and fork guide from
shift rod.
SDIA2140E
SMT992C
SDIA2141E
SDIA2142E