2007 INFINITI M35 ABS

LAN-2Revision: 2007 April2007 M35/M45 CAN System (Type 7) ............................................. 76
DIAGNOSIS SHEET ............................................ 76
CAN System (Type 8) ............................................. 77
DIAGNOSIS SHEET ............................................ 77
CAN System (Type 9) ............................................. 78
DIAGNOSIS SHEET ............................................ 78
CAN System (Type 10) ........................................... 79
DIAGNOSIS SHEET ............................................ 79
CAN System (Type 11) ........................................... 80
DIAGNOSIS SHEET ............................................ 80
Component Parts Location ..................................... 81
Harness Layout ...................................................... 81
Malfunction Area Chart ........................................... 82
MAIN LINE ........................................................... 82
BRANCH LINE .................................................... 82
SHORT CIRCUIT ................................................ 82
Main Line Between TCM and Data Link Connector ... 83
Main Line Between Data Link Connector and Pre-
crash Seat Belt Control Unit ................................... 84
Main Line Between Data Link Connector and RAS
Control Unit ............................................................. 85
Main Line Between RAS Control Unit and Pre-crash
Seat Belt Control Unit ............................................. 86
Main Line Between Pre-crash Seat Belt Control Unit
and Driver Seat Control Unit ................................... 87
Main Line Between Driver Seat Control Unit and ABS Actuator and Electric Unit (Control Unit) ......... 88
Main Line Between ABS Actuator and Electric Unit
(Control Unit) and ICC Sensor Integrated Unit ....... 89
ECM Branch Line Circuit ......................................... 89
AWD Control Unit Branch Line Circuit .................... 90
AFS Control Unit Branch Line Circuit ...................... 91
BCM Branch Line Circuit ......................................... 91
LDW Camera Unit Branch Line Circuit ................... 92
TCM Branch Line Circuit ......................................... 93
NAVI Control Unit Branch Line Circuit .................... 93
AV Control Unit Branch Line Circuit ........................ 94
Data Link Connector Branch Line Circuit ................ 95
Intelligent Key Unit Branch Line Circuit ................... 95
Unified Meter and A/C Amp. Branch Line Circuit .... 96
Steering Angle Sensor Branch Line Circuit ............. 97
Low Tire Pressure Warning Control Unit Branch Line
Circuit ...................................................................... 97
RAS Control Unit Branch Line Circuit ..................... 98
Pre-Crash Seat Belt Control Unit Branch Line Circuit
... 99
Driver Seat Control Unit Branch Line Circuit ........... 99
ABS Actuator and Electric Unit (Control Unit) Branch
Line Circuit ............................................................100
ICC Sensor Integrated Unit Branch Line Circuit ...101
IPDM E/R Branch Line Circuit ...............................101
CAN Communication Circuit .................................102

LAN-8
[CAN FUNDAMENTAL]
TROUBLE DIAGNOSIS
Revision: 2007 April2007 M35/M45
Symptom When Error Occurs in CAN Communication SystemNKS004HD
In CAN communication system, multiple units mutually transmit and receive signals. Each unit cannot transmit
and receive signals if any error occurs on CAN communication line. Under this condition, multiple control units
related to the root cause malfunction or go into fail-safe mode.
ERROR EXAMPLE
NOTE:

Each vehicle differs in symptom of each unit under fail-safe mode and CAN communication line wiring.

Refer to LAN-41, "Abbreviation List" for the unit abbreviation.
Example: TCM 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.

TROUBLE DIAGNOSIS
LAN-9
[CAN FUNDAMENTAL]
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Revision: 2007 April2007 M35/M45
Example: Data link connector branch line open circuit
NOTE:

When data link connector branch line is open, transmission 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, the screen-display of the CONSULT-II “SELECT SYSTEM”
screen may be the same as when the CAN communication line has short-circuit. However, symptoms dif-
fer depending on the case. See below chart for the differences.
SKIB8739E
Unit name Symptom
ECM
Normal operation. BCM
EPS control unit
Combination meter
ABS actuator and electric unit (control unit)
TCM
IPDM E/R
SELECT SYSTEM
(CONSULT-II)Difference of symptom
Data link connector branch line open cir-
cuit
All Diag on CAN units are not
indicated.Normal operation.
CAN-H, CAN-L harness short-circuitMost of the units which are connected to the CAN
communication system enter fail-safe mode or are
deactivated.

LAN-10
[CAN FUNDAMENTAL]
TROUBLE DIAGNOSIS
Revision: 2007 April2007 M35/M45
Example: Main Line Between Data Link Connector and ABS Actuator and Electric Unit (Con-
trol Unit) Open Circuit
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
wiper 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.
TCM No impact on operation.
IPDM E/RWhen the ignition switch is ON,

The headlamps (Lo) turn ON.

The cooling fan continues to rotate.

TROUBLE DIAGNOSIS
LAN-11
[CAN FUNDAMENTAL]
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LAN
Revision: 2007 April2007 M35/M45
Example: CAN-H, CAN-L Harness Short Circuit
SKIB8741E
Unit name Symptom
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/RWhen the ignition switch is ON,

The headlamps (Lo) turn ON.

The cooling fan continues to rotate.

TROUBLE DIAGNOSES WORK FLOW
LAN-29
[CAN FUNDAMENTAL]
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Revision: 2007 April2007 M35/M45
f. Reception item of “METER”: On “TCM”, “UNKWN” is indicated. This means M&A cannot receive the sig-
nal from TCM. Draw a line to indicate an error between M&A and TCM (line 2-f in the figure).
g. Reception item of “AUTO DRIVE POS.”: On “TCM”, “UNKWN” is indicated. This means ADP cannot
receive the signal from TCM. Draw a line to indicate an error between ADP and TCM (line 2-g in the fig-
ure).
h. Reception item of “ABS”: “UNKWN” is not indicated. This indicates normal communication between ABS
and its receiving units. Do not draw any line.
SKIB8727E

LAN-34
[CAN FUNDAMENTAL]
TROUBLE DIAGNOSES WORK FLOW
Revision: 2007 April2007 M35/M45
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-44, "
CAN Diagnostic Sup-
port Monitor" .
a. Reception item of “ENGINE”: “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).
b. Reception item of “METER”: “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).
c. Reception item of “TRANSMISSION”: “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 fig-
ure).
SKIB8732E

TROUBLE DIAGNOSES WORK FLOW
LAN-35
[CAN FUNDAMENTAL]
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LAN
Revision: 2007 April2007 M35/M45
3. CAN DIAG SUPPORT MNTR (without PAST): Check 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 SELF-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 items. (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).
b. Reception item of “ABS”: Assume that the unit could not receive the signal from ECM. Draw a line
between ABS and ECM (line 3-b in the figure).
SKIB8733E