2010 INFINITI QX56 ABS

INL-78
< ON-VEHICLE REPAIR >
INTERIOR ROOM LAMP
1. Using a suitable tool (A), release the tabs and remove the vanitymirror lamp lens (1).
: Pawl
2. Release one side of the bulb (2) from the tab, then pull straight out to remove.
CAUTION:
Wrap a cloth around tool to protect the housing and lens.
GLOVE BOX LAMP
Removal
1. Remove instrument lower panel RH and glove box. Refer to IP-17, "Removal and Installation".
2. Rotate glove box lamp socket and rotate counterclockwise to release from steering member.
Installation
Installation is in the reverse order of removal.
Bulb Replacement
1. Remove instrument lower panel RH and glove box. Refer to IP-17, "Removal and Installation".
2. Pull bulb (2) straight out from glove box lamp socket (1) to remove.
STEP LAMP
Removal
Vanity mirror lamp bulb : 12V - 1.8W
ALLIA0320ZZ
Glove box lamp bulb : 12V - 3.4W
ALLIA0321ZZ
Revision: April 20092010 QX56

LAN-2
MAIN LINE BETWEEN TCM AND LASER
CIRCUIT .............................................................
63
Diagnosis Procedure ........................................... ...63
MAIN LINE BETWEEN LASER AND ICC CIR-
CUIT ...................................................................
64
Diagnosis Procedure ........................................... ...64
MAIN LINE BETWEEN ICC AND ADP CIR-
CUIT ...................................................................
65
Diagnosis Procedure ........................................... ...65
MAIN LINE BETWEEN ADP AND AV CIR-
CUIT ...................................................................
66
Diagnosis Procedure ........................................... ...66
MAIN LINE BETWEEN AV AND DLC CIR-
CUIT ...................................................................
67
Diagnosis Procedure ........................................... ...67
MAIN LINE BETWEEN DLC AND M&A CIR-
CUIT ...................................................................
68
Diagnosis Procedure ........................................... ...68
MAIN LINE BETWEEN M&A AND ABS CIR-
CUIT ...................................................................
69
Diagnosis Procedure ........................................... ...69
MAIN LINE BETWEEN M&A AND 4WD CIR-
CUIT ...................................................................
70
Diagnosis Procedure ........................................... ...70
MAIN LINE BETWEEN 4WD AND ABS CIR-
CUIT ...................................................................
71
Diagnosis Procedure ........................................... ...71
ECM BRANCH LINE CIRCUIT ..........................72
Diagnosis Procedure ........................................... ...72
TCM BRANCH LINE CIRCUIT ..........................73
Diagnosis Procedure ........................................... ...73
LASER BRANCH LINE CIRCUIT ......................74
Diagnosis Procedure ............................................ ...74
ICC BRANCH LINE CIRCUIT ............................75
Diagnosis Procedure ............................................ ...75
ADP BRANCH LINE CIRCUIT ..........................76
Diagnosis Procedure ............................................ ...76
AV BRANCH LINE CIRCUIT .............................77
Diagnosis Procedure ............................................ ...77
BCM BRANCH LINE CIRCUIT ..........................78
Diagnosis Procedure ............................................ ...78
DLC BRANCH LINE CIRCUIT ..........................79
Diagnosis Procedure ............................................ ...79
HVAC BRANCH LINE CIRCUIT ........................80
Diagnosis Procedure ............................................ ...80
I-KEY BRANCH LINE CIRCUIT ........................81
Diagnosis Procedure ............................................ ...81
M&A BRANCH LINE CIRCUIT ..........................82
Diagnosis Procedure ............................................ ...82
STRG BRANCH LINE CIRCUIT ........................83
Diagnosis Procedure ............................................ ...83
4WD BRANCH LINE CIRCUIT ..........................84
Diagnosis Procedure ............................................ ...84
ABS BRANCH LINE CIRCUIT ..........................85
Diagnosis Procedure ............................................ ...85
IPDM-E BRANCH LINE CIRCUIT .....................86
Diagnosis Procedure ............................................ ...86
CAN COMMUNICATION CIRCUIT ...................87
Diagnosis Procedure ............................................ ...87
Revision: April 20092010 QX56

LAN-8
< FUNCTION DIAGNOSIS >[CAN FUNDAMENTAL]
TROUBLE DIAGNOSIS
Example: TCM branch line open circuit
Example: Data link connector branch line open circuit
SKIB8738E
Unit name
Symptom
ECM Engine torque limiting is affected, and shift harshness increases.
BCM Reverse warning chime does not sound.
EPS control unit Normal operation.
Combination meter • Shift position indicator and OD OFF indicator turn OFF.
• Warning lamps turn ON.
ABS actuator and electric unit (control unit) Normal operation.
TCM No impact on operation.
IPDM E/R Normal operation.
SKIB8739E
Revision: April 20092010 QX56

LAN
TROUBLE DIAGNOSISLAN-9
< FUNCTION DIAGNOSIS > [CAN FUNDAMENTAL]
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NOTE:
• When data link connector branch line is open, transmi
ssion and reception of CAN communication signals
are not affected. Therefore, no symptoms occur. However, be sure to repair malfunctioning circuit.
• When data link connector branch line is open, “ECU list ” displayed on the CONSULT-III “CAN DIAG SUP-
PORT MNTR” may be the same as when the CAN comm unication line has short-circuit. However, symp-
toms differ depending on the case. See below chart for the differences.
Example: Main Line Between Data Link Connector and ABS Actuator and Electr ic Unit (Control Unit) Open Circuit
Unit name Symptom
ECM
Normal operation.
BCM
EPS control unit
Combination meter
ABS actuator and electric
unit (control unit)
TCM
IPDM E/R
“ECU list” on the “CAN DIAG SUPPORT MNTR”(CONSULT-III) Difference of symptom
Data link connector branch line open circuit All Diag on CAN units are not
indicated.Normal operation.
CAN-H, CAN-L harness short-circuit Most of the units which are connected to the CAN
communication system enter fail-safe mode or are
deactivated.
SKIB8740E
Unit name
Symptom
ECM Engine torque limiting is affected, and shift harshness increases.
BCM • Reverse warning chime does not sound.
• The front wiper moves under continuous operation mode even though the front wip-
er switch being in the intermittent position.
EPS control unit The steering effort increases.
Combination meter • The shift position indicator and OD OFF indicator turn OFF.
• The speedometer is inoperative.
• The odo/trip meter stops.
ABS actuator and electric unit (control unit) Normal operation.
Revision: April 20092010 QX56

LAN-10
< FUNCTION DIAGNOSIS >[CAN FUNDAMENTAL]
TROUBLE DIAGNOSIS
Example: CAN-H, CAN-L Harness Short Circuit
TCM
No impact on operation.
IPDM E/R When the ignition switch is ON,
• The headlamps (Lo) turn ON.
• The cooling fan continues to rotate.
Unit name
Symptom
SKIB8741E
Unit nameSymptom
ECM • Engine torque limiting is affected, and shift harshness increases.
• Engine speed drops.
BCM • Reverse warning chime does not sound.
• The front wiper moves under continuous operation mode even though the front
wiper switch being in the intermittent position.
• The room lamp does not turn ON.
• The engine does not start (if an error or malfunction occurs while turning the igni- tion switch OFF.)
• The steering lock does not release (if an error or malfunction occurs while turning the ignition switch OFF.)
EPS control unit The steering effort increases.
Combination meter • The tachometer and the speedometer do not move.
• Warning lamps turn ON.
• Indicator lamps do not turn ON.
ABS actuator and electric unit (control unit) Normal operation.
TCM No impact on operation.
IPDM E/R When the ignition switch is ON,
• The headlamps (Lo) turn ON.
• The cooling fan continues to rotate.
Revision: April 20092010 QX56

LAN
DIAGNOSIS AND REPAIR WORKFLOWLAN-25
< BASIC INSPECTION > [CAN FUNDAMENTAL]
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h. Reception item of “ABS”: “UNKWN” is not indicated. This indicates normal communication between ABS
and its receiving units. Do not draw any line.
i. Reception item of “IPDM-E”: “UNKWN” is not indicated. This indicates normal communication between IPDM-E and its receiving units. Do not draw any line.
3. Based on information received from “CAN DIAG SUPPORT MNTR”, place a check mark on the known good CAN communication line between ECM and IPDM-E.
a. Through the previous procedure, the circuit betw een ADP splice and TCM has the most amount of lines
(shade 3-a in the figure below).
b. Place a check mark on the known good lines to establish the error circuit.
PKID1217E
Revision: April 20092010 QX56

LAN
DIAGNOSIS AND REPAIR WORKFLOWLAN-29
< BASIC INSPECTION > [CAN FUNDAMENTAL]
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1. SELF-DIAG RESULTS: Inspect the control units
indicating “U1000” or “U1001” on SELF-DIAG RESULTS.
2. CAN DIAG SUPPORT MNTR (with PAST): Check the CAN DIAG SUPPORT MNTR (with PAST) of units indicating “U1000” or “U1001” on SELF-DIAG RESULTS. Draw a line on the diagnosis sheet to indicate
the possible error circuit.
NOTE:
For the details of each indication on CAN DIAG SUPPORT MNTR, refer to LAN-47, "
CAN Diagnostic Sup-
port Monitor".
a. Reception item of “ECM”: “VDC/TCS/ABS”, “3” is indicated in the “PAST”. This means ECM could not receive the signal from ABS in the past. Draw a line between ECM and ABS (line 2-a in the figure below).
b. Reception item of “M&A”: “VDC/TCS/ABS”, “3” is indicated in the “PAST”. This means M&A could not
receive the signal from ABS in the past. Draw a line between M&A and ABS (line 2-b in the figure below).
PKID1221E
Revision: April 20092010 QX56

LAN-30
< BASIC INSPECTION >[CAN FUNDAMENTAL]
DIAGNOSIS AND REPAIR WORKFLOW
c. Reception item of “TCM”: “VDC/TCS/ABS”, “3” is indicated in the “PAST”. This means TCM could not
receive the signal from ABS in the past. Draw a line between TCM and ABS (line 2-c in the figure below).
3. CAN DIAG SUPPORT MNTR (without PAST): Chec k the CAN DIAG SUPPORT MNTR (without PAST) of
units indicating “U1000” or “U1001” on SELF-DIAG RESULTS. Draw a line on the diagnosis sheet to indi-
cate the possible error circuit.
NOTE:
• While an error occurred in the past according to SE LF-DIAG RESULTS, it is unclear which signal is not
received. Assume that errors were detected from all reception items.
• Draw a single line among the unit and all reception it ems. (Work flow differs from CAN DIAG SUPPORT
MNTR (with PAST).)
a. Reception item of “EPS”: Assume that the unit could not receive the signals from ECM, ABS, and M&A. Draw a line among EPS, ECM, ABS, and M&A (line 3-a in the figure below).
PKID1222E
Revision: April 20092010 QX56