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K ELECTRICAL

B
SECTION
DRIVER INFORMATION SYSTEM C

E
CONTENTS
PRECAUTION ........................................................... 3 . FUEL GAUGE .................................................... 21 . F
Precautions for Supplemental Restraint System Fuel Level Sensor Signal Inspection 2 .................. 22 .
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- LOW-FUEL WARNING LAMP ............................ 22 .
SIONER" ................................................................. 3
. Communication Line Inspection ............................ 23 . G
PREPARATION .......................................................... 4 . Fuel Gauge Pointer Fluctuates, Indicates Wrong
Commercial Service Tool ........................................ 4 . Value, or Varies ..................................................... 25
.
COMBINATION METERS .......................................... 5 . Fuel Gauge Does Not Move to Full-position .......... 25 .
H
Component Parts and Harness Connector Location 5 ..... Electrical Components Inspection ......................... 26 .
System Description ................................................. 5 . FUEL LEVEL SENSOR UNIT CHECK ............... 26 .
UNIFIED METER CONTROL UNIT ..................... 5 . Combination Meter ................................................ 26.
UNIFIED METER AND A/C AMP. ........................ 5 . REMOVAL AND INSTALLATION ....................... 26 . I
POWER SUPPLY AND GROUND CIRCUIT ....... 6 . UNIFIED METER AND A/C AMP ............................. 27 .
WATER TEMPERATURE GAUGE ....................... 6 . System Description ................................................ 27
.
TACHOMETER .................................................... 7 . INPUT/OUTPUT SIGNALS ................................ 27 . J
FUEL GAUGE ...................................................... 7 . FAIL-SAFE ......................................................... 28
.
SPEEDOMETER .................................................. 7 . CAN Communication System Description ............. 28 .
ODO/TRIP METER .............................................. 7 . Schematic .............................................................. 29
. DI
CAN COMMUNICATION SYSTEM DESCRIP- Unified Meter and A/C Amp. Harness Connector
TION ..................................................................... 7
. Terminal Layout ..................................................... 30
.
Arrangement of Combination Meter ........................ 8 . Terminals and Reference Value for Unified Meter
Internal Circuit ......................................................... 9
. and A/C Amp. ........................................................ 30
. L
Wiring Diagram -- METER -- ............................... 10 . CONSULT-II Function (METER A/C AMP) ............ 32 .
Combination Meter Harness Connector Terminal CONSULT-II START PROCEDURE ................... 32 .
Layout ................................................................... 12
. SELF-DIAGNOSTIC RESULTS .......................... 32 . M
Terminals and Reference Value for Combination DATA MONITOR ................................................ 32 .
Meter ..................................................................... 12
. Unified Meter and A/C Amp. .................................. 34 .
Terminals and Reference Value for Unified Meter REMOVAL AND INSTALLATION ....................... 34 .
and A/C Amp. ........................................................ 13. COMPASS ................................................................ 35
.
Self-Diagnosis Mode of Combination Meter .......... 13 . System Description ................................................ 35
.
SELF-DIAGNOSIS MODE FUNCTION .............. 13 . POWER SUPPLY AND GROUND CIRCUIT ...... 35 .
OPERATION PROCEDURE .............................. 13 . CALIBRATION .................................................... 35.
CONSULT-II Function ........................................... 14 . Wiring Diagram -- COMPAS -- ............................ 36 .
How to Proceed With Trouble Diagnosis ............... 14 . Trouble Diagnoses ................................................ 37.
Preliminary Check ................................................. 14 . COMPASS INSPECTION ................................... 37 .
Symptom Chart ..................................................... 15 . Zone Variation Change Procedure ........................ 38 .
Power Supply and Ground Circuit Inspection ....... 16 . CALIBRATION FUNCTION OF COMPASS ....... 38 .
Vehicle Speed Signal Inspection ........................... 18 . WARNING LAMPS ................................................... 39 .
Engine Speed Signal Inspection ........................... 20 . Schematic .............................................................. 39
.
Water Temperature Signal Inspection ................... 20 . Wiring Diagram -- WARN -- ................................. 40 .
Fuel Level Sensor Signal Inspection 1 .................. 21 . Oil Pressure Warning Lamp Stays Off (Ignition

Revision: May 2006 DI-1 2007 Maxima
Switch ON) ............................................................ 47 . Light Warning Chime Does Not Operate ................64 .
Oil Pressure Warning Lamp Does Not Turn Off (Oil Seat Belt Warning Chime Does Not Operate .........65 .
Pressure Is Normal) ............................................... 48 . REAR SONAR SYSTEM ..........................................67 .
Component Inspection ........................................... 49 . Component Parts and Harness Connector Location ...67
OIL PRESSURE SWITCH .................................. 49 . System Description ................................................67 .
CVT INDICATOR ...................................................... 50 . FUNCTION .........................................................67 .
Wiring Diagram -- CVTIND -- .............................. 50 . REAR SONAR SYSTEM OFF SWITCH .............68 .
............................................................................ 50
. SONAR BUZZER ................................................68 .
CVT Indicator Does Not Illuminate ........................ 52 . REAR SONAR SENSOR ....................................68 .
WARNING CHIME .................................................... 53 . Wiring Diagram -- SONAR -- ...............................69 .
Component Parts and Harness Connector Location 53 ... Sonar Control Unit Harness Connector Terminal
System Description ................................................ 53 . Layout ....................................................................71
.
FUNCTION ......................................................... 53 . Terminals And Reference Value For Sonar Control
IGNITION KEY WARNING CHIME ..................... 54 . Unit .........................................................................71
.
LIGHT WARNING CHIME .................................. 54 . How to Proceed With Trouble Diagnosis ...............72 .
SEAT BELT WARNING CHIME .......................... 54 . Pre-diagnosis Inspection ........................................72 .
CAN Communication System Description ............. 55 . SENSOR STATUS CHECK ................................72 .
Wiring Diagram -- CHIME -- ................................ 56 . Self-diagnosis Function ..........................................72 .
Terminals and Reference Value for BCM ............... 58 . ENTERING DIAGNOSTICS MODE ....................72 .
Terminals and Reference Value for Unified Meter REQUESTING NUMBER OF FAULT CODES
and A/C Amp. ........................................................ 58 . MODE .................................................................73 .
Terminals and Reference Value for Combination REQUESTING FAULT CODES MODE ...............73 .
Meter ..................................................................... 58
. IDLING OR CLEARING FAULT CODES MODE...73
How to Proceed With Trouble Diagnosis ............... 58 . Preliminary Check ..................................................74 .
Preliminary Check ................................................. 58 . INSPECTION FOR POWER SUPPLY AND
INSPECTION FOR POWER SUPPLY AND GROUND CIRCUIT ............................................74 .
GROUND CIRCUIT ............................................ 58 . Symptom Chart ......................................................75 .
CONSULT-II Function (BCM) ................................. 59 . Component Inspection ...........................................76 .
CONSULT-II START PROCEDURE ................... 59 . SONAR BUZZER ................................................76 .
DATA MONITOR ................................................. 59 . REAR SONAR SYSTEM OFF SWITCH .............76 .
ACTIVE TEST .................................................... 59 . REAR SONAR SYSTEM OFF INDICATOR ........76 .
SELF-DIAGNOSTIC RESULTS .......................... 60 . Rear Sonar Sensors ..............................................76 .
All Warning Chimes Do Not Operate ..................... 60 . REMOVAL AND INSTALLATION ........................76 .
Key Warning Chime and Light Warning Chime Do Sonar Control Unit .................................................76 .
Not Operate (Seat Belt Warning Chime Does Oper- REMOVAL AND INSTALLATION ........................76 .
ate) ........................................................................ 61
. INSTALLATION ..................................................76 .
Key Warning Chime Does Not Operate ................. 62 .

Revision: May 2006 DI-2 2007 Maxima
PRECAUTION

PRECAUTION PFP:00011
A
Precautions for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT
BELT PRE-TENSIONER" EKS0092T

The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along B
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 C
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 SRS and SB section of this Service Man-
ual.
WARNING: D
G 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 per-
formed by an authorized NISSAN/INFINITI dealer. E
G Improper maintenance, including incorrect removal and installation of the SRS, can lead to per-
sonal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air
Bag Module, see the SRS section. F
G 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
harness connectors.
G

Revision: May 2006 DI-3 2007 Maxima
PREPARATION

PREPARATION PFP:00002

Commercial Service Tool EKS0092V

Tool name Description
Power tool Loosening bolts and nuts

PBIC0191E

Revision: May 2006 DI-4 2007 Maxima
COMBINATION METERS

COMBINATION METERS PFP:24814
A
Component Parts and Harness Connector Location EKS00I8F

G
WKIA5296E

1. Combination meter M24 2. Unified meter and A/C amp. M49, 3. ABS actuator and electric unit (con-
M50, M89 trol unit) E125 (engine removed for
clarity) H
4. ECM M82 (view with glove box 5. Fuel level sensor unit and fuel pump
removed) B16 (view with rear seat and inspec-
tion hole cover removed) I

System Description EKS0092W

UNIFIED METER CONTROL UNIT J
G Speedometer, odo/trip meter, tachometer, fuel gauge and water temperature gauge are controlled by the
unified meter control unit, which is built into the combination meter. Unified meter control unit receives sig-
nals from unified meter and A/C amp. DI
G Warning lamps and indicator lamps are controlled by signals drawn from the unified meter and A/C amp.,
BCM (body control module), and components connected directly to the combination meter.
G Digital meter is adopted for odo/trip meter.* L
*The record of the odometer is kept even if the battery cable is disconnected. The record of the trip meter
is erased when the battery cable is disconnected.
G Odo/trip meter and CVT indicator segments can be checked in diagnosis mode. M
G Meters/gauges can be checked in diagnosis mode.
Illumination control
The unified meter control unit outputs the odo/trip meter and CVT indicator lighting when the ignition switch is
turned ON. When the lighting switch is turned on, the illumination control switch can be used to adjust the
brightness of the combination meter illumination and the odo/trip meter illumination. When the ignition switch
is in the START position, the combination meter dial lighting and illumination control switch lighting are turned
off. For additional combination meter illumination control information, refer to LT-150, "System Description" .
UNIFIED METER AND A/C AMP.
For unified meter and A/C amp. system description information, refer to DI-27, "System Description" .

Revision: May 2006 DI-5 2007 Maxima
COMBINATION METERS

POWER SUPPLY AND GROUND CIRCUIT
Power is supplied at all times
G through 10A fuse [No.19, located in the fuse block (J/B)]
G to combination meter terminal 24, and
G to unified meter and A/C amp. terminal 21.
With the ignition switch in the ON or START position, power is supplied
G through 10A fuse [No.14, located in the fuse block (J/B)]
G to combination meter terminal 23, and
G through 10A fuse [No.12, located in the fuse block (J/B)]
G to unified meter and A/C amp. terminal 22.
With the ignition switch in the ON position, power is supplied
G through 15A fuse [No.10, located in the fuse block (J/B)], and
G through 15A fuse [No.11, located in the fuse block (J/B)]
G to unified meter and A/C amp. terminal 46.
With the ignition switch in the ACC or ON position, power is supplied
G through 10A fuse [No. 6, located in the fuse block (J/B)]
G to combination meter terminal 6, and
G to unified meter and A/C amp. terminal 35.
Ground is supplied
G to combination meter terminals 10, 11 and 12, and
G to unified meter and A/C amp. terminals 29 and 30
G through body grounds M57, M61 and M79.
WATER TEMPERATURE GAUGE
The water temperature gauge indicates the engine coolant temperature.
ECM provides a water temperature signal to unified meter and A/C amp. via CAN communication lines. Uni-
fied meter and A/C amp. provides a water temperature signal to combination meter for water temperature
gauge via communication lines between unified meter and A/C amp. and combination meter.

PKIB7632E

Revision: May 2006 DI-6 2007 Maxima
COMBINATION METERS

TACHOMETER
The tachometer indicates engine speed in revolutions per minute (rpm). A
ECM provides an engine speed signal to unified meter and A/C amp. via CAN communication lines. Unified
meter and A/C amp. provides an engine speed signal to combination meter for tachometer via communication
lines between unified meter and A/C amp. and combination meter. B

E
PKIB7631E

FUEL GAUGE
The fuel gauge indicates the approximate fuel level in the fuel tank. F
The fuel gauge is regulated by a variable ground signal supplied
G from unified meter and A/C amp. terminal 36
G through the fuel level sensor unit and fuel pump terminal 5 G
G through the fuel level sensor unit and fuel pump terminal 2
G to unified meter and A/C amp. terminal 28 for the fuel gauge.
H
Unified meter and A/C amp. provides a fuel level signal to combination meter for fuel gauge via communica-
tion lines between unified meter and A/C amp. and combination meter.
SPEEDOMETER I
ABS actuator and electric unit (control unit) provides a vehicle speed signal to the unified meter and A/C amp.
via CAN communication lines. After unified meter and A/C amp. receives the vehicle speed signal, it changes
the signal to 8 pulse signal and provides the 8 pulse signal to the combination meter for the speedometer via J
communication line.

PKIC0696E

ODO/TRIP METER
The vehicle speed signal and the memory signals from the meter memory circuit are processed by the combi-
nation meter and the mileage is displayed.
How to Change the Display
Refer to Owner's Manual for odo/trip meter operating instructions.
CAN COMMUNICATION SYSTEM DESCRIPTION
Refer to LAN-4, "SYSTEM DESCRIPTION" .

Revision: May 2006 DI-7 2007 Maxima
COMBINATION METERS

Arrangement of Combination Meter EKS0092Y

LKIA0723E

Revision: May 2006 DI-8 2007 Maxima
COMBINATION METERS

Internal Circuit EKS0092Z

WKWA4825E

Revision: May 2006 DI-9 2007 Maxima
COMBINATION METERS

Wiring Diagram -- METER -- EKS00930

WKWA4826E

Revision: May 2006 DI-10 2007 Maxima
COMBINATION METERS

WKWA4827E

Revision: May 2006 DI-11 2007 Maxima
COMBINATION METERS

Combination Meter Harness Connector Terminal Layout EKS00I6A

WKIA5297E

Terminals and Reference Value for Combination Meter EKS00931

Condition
Terminal Wire Reference value (V)
Item Ignition
No. color Operation or condition (Approx.)
switch

Seat belt buckle switch Unfastened (ON) 0
1 O ON
LH Fastened (OFF) Battery voltage
Washer fluid level low 0
3 R/W Washer fluid level switch ON
Washer fluid level normal Battery voltage

Seat belt buckle switch Unfastened (ON) 0
4 W ON
RH Fastened (OFF) Battery voltage
Ignition switch ACC or
6 V ON -- Battery voltage
ON
10 B Ground OFF -- 0
11 B Ground OFF -- 0
12 B Ground OFF -- 0
Refer to LT-151, "ILLUMINATION
Illumination control switch
13 R/L -- -- OPERATION BY LIGHTING
(+)
SWITCH" .
Refer to LT-151, "ILLUMINATION
Illumination control switch
14 R/Y -- -- OPERATION BY LIGHTING
(-)
SWITCH" .
Brake fluid level low 0
15 SB Brake fluid level switch ON
Brake fluid level normal Battery voltage
Parking brake applied 0
16 P/B Parking Brake switch ON
Parking brake released Battery voltage

Speedometer operated
Vehicle speed signal
20 BR ON [When vehicle speed is
(8-pulse)
approx. 40 km/h (25 MPH)]

PKIA1935E

RX communication line
21 L/W (From unified meter and ON --
A/C amp.)

SKIA3362E

Revision: May 2006 DI-12 2007 Maxima
COMBINATION METERS

Condition
Terminal Wire Reference value (V) A
Item Ignition
No. color Operation or condition (Approx.)
switch

B
TX communication line
22 BR/Y (To unified meter and A/C ON --
amp.) C

SKIA3361E

Ignition switch ON or D
23 O ON -- Battery voltage
START
24 Y/R Battery power supply OFF -- Battery voltage
E
Terminals and Reference Value for Unified Meter and A/C Amp. EKS00932

Refer to DI-30, "Terminals and Reference Value for Unified Meter and A/C Amp." .
F
Self-Diagnosis Mode of Combination Meter EKS00933

SELF-DIAGNOSIS MODE FUNCTION
G Odo/trip meter segment and CVT indicator segment operation can be checked in self-diagnosis mode.
G
G Meters/gauges can be checked in self-diagnosis mode.
OPERATION PROCEDURE
1. Turn ignition switch ON, and switch the odo/trip meter to "trip A" or "trip B". H
NOTE:
If the diagnosis function is activated with trip meter A displayed, the mileage on trip meter A will indicate
0000.0 miles, but the actual trip mileage will be retained. (Trip B operates the same way.) I
2. Turn ignition switch OFF.
3. While pushing the odo/trip meter switch (1), turn ignition switch
ON again. J
4. Make sure the trip meter displays "0000.0".
5. Push the odo/trip meter switch (1) at least 3 times within 5 sec-
onds. DI

LKIA0722E

M
6. All the segments on the odo/trip meter and CVT indicator illumi-
nate, and simultaneously the low-fuel warning lamp indicator
illuminates. At this time, the unified meter control unit is turned
to diagnosis mode.
NOTE:
If any of the segments are not displayed, replace the combina-
tion meter.

LKIA0724E

Revision: May 2006 DI-13 2007 Maxima
COMBINATION METERS

7. Push the odo/trip meter switch. Each meter/gauge should indi-
cate as shown in the figure while pushing odo/trip meter switch.
(At this time, the low-fuel warning lamp goes off.)

LKIA0725E

CONSULT-II Function EKS00934

Refer to DI-32, "CONSULT-II Function (METER A/C AMP)" .
How to Proceed With Trouble Diagnosis EKS00935

1. Confirm the symptom or customer complaint.
2. Perform preliminary check. Refer to DI-14, "Preliminary Check" .
3. According to the symptom chart, repair or replace the cause of the symptom. Refer to DI-15, "Symptom
Chart" .
4. Does the meter operate normally? If so, go to 5. If not, go to 2.
5. Inspection End.
Preliminary Check EKS00936

1. CHECK SELF-DIAGNOSTIC RESULTS OF UNIFIED METER AND A/C AMP.
1. Start engine.
2. Select "METER A/C AMP" on CONSULT-II, and perform self-diagnosis of unified meter and A/C amp.
Refer to DI-32, "CONSULT-II Function (METER A/C AMP)" .
3. After erasing the self-diagnosis result, perform self-diagnosis again.
Self-diagnostic results content
No malfunction detected>> GO TO 2.
Malfunction detected>> Go to DI-32, "Display Item List" .

2. CHECK WARNING LAMP ILLUMINATION
1. Turn ignition switch ON.
2. Make sure warning lamps (such as malfunction indicator lamp and oil pressure warning lamp) illuminate.
Do warning lamps illuminate?
YES >> GO TO 3.
NO >> Check ignition power supply system of combination meter. Refer to DI-16, "Power Supply and
Ground Circuit Inspection" .

3. CHECK SELF-DIAGNOSIS OPERATION OF COMBINATION METER
Perform combination meter self-diagnosis. Refer to DI-13, "Self-Diagnosis Mode of Combination Meter" .
Does self-diagnosis mode operate?
YES >> GO TO 4.
NO >> Check combination meter power supply and ground circuit. Refer to DI-16, "Power Supply and
Ground Circuit Inspection" .

Revision: May 2006 DI-14 2007 Maxima
COMBINATION METERS

4. CHECK ODO/TRIP METER OPERATION A
Check segment display status of odo/trip meter.
Is the display normal?
YES >> GO TO 5. B
NO >> Replace the combination meter. Refer to DI-26, "Combi-
nation Meter" .
C

D
LKIA0724E

5. CHECK LOW-FUEL WARNING LAMP ILLUMINATION CONFIRMATION E

During low-fuel warning lamp check, confirm illumination of low-fuel warning lamp.
Condition of odo/trip F
Low-fuel warning lamp
meter switch
Pushed Does not illuminate
Released Illuminates G
OK or NG
OK >> GO TO 6.
H
NG >> Replace the combination meter. Refer to DI-26, "Combination Meter" .

6. CHECK COMBINATION METER CIRCUIT
I
Check indication of each meter/gauge in self-diagnosis mode.
OK or NG
OK >> Go to DI-15, "Symptom Chart" . J
NG >> Replace the combination meter. Refer to DI-26, "Combi-
nation Meter" .
DI

L
LKIA0725E

Symptom Chart EKS00IMO
M
Symptom Possible cause
Improper speedometer and odo/trip meter Indication. Refer to DI-18, "Vehicle Speed Signal Inspection" .
Improper tachometer indication. Refer to DI-20, "Engine Speed Signal Inspection" .
Improper water temperature gauge indication. Refer to DI-20, "Water Temperature Signal Inspection" .
Improper fuel gauge indication. Refer to DI-21, "Fuel Level Sensor Signal Inspection 1" .
Improper low-fuel warning lamp indication. Refer to DI-22, "Fuel Level Sensor Signal Inspection 2" .
Replace the combination meter. Refer to DI-26, "Combination
More than one gauge does not give proper indication.
Meter" .
Improper CVT position indication. Refer to DI-50, "CVT INDICATOR" .
Illumination control does not operate properly. Refer to LT-150, "ILLUMINATION" .

Revision: May 2006 DI-15 2007 Maxima
COMBINATION METERS

Power Supply and Ground Circuit Inspection EKS00937

1. CHECK FUSE
Check for blown combination meter and unified meter and A/C amp. fuses.
Unit Power source Fuse No.
Combination meter
Battery 19
Unified meter and A/C amp.
Combination meter Ignition switch ON or START 14
Unified meter and A/C amp. Ignition switch ON or START 12
Unified meter and A/C amp. Ignition switch ON 10, 11
Combination meter
Ignition switch ACC or ON 6
Unified meter and A/C amp.
Refer to DI-10, "Wiring Diagram -- METER --" .
OK or NG
OK >> GO TO 2.
NG >> If fuse is blown, be sure to eliminate cause of malfunction before installing new fuse. Refer to PG-
4, "POWER SUPPLY ROUTING CIRCUIT" .

Revision: May 2006 DI-16 2007 Maxima
COMBINATION METERS

2. CHECK POWER SUPPLY CIRCUIT A
1. Disconnect combination meter connector M24 and unified meter
and A/C amp. connectors M50 and M89.
2. Check voltage between combination meter harness connector B
terminals and ground.
Terminals Ignition switch position
C
(+)
Combination (

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