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K ELECTRICAL

B
SECTION
DRIVER INFORMATION SYSTEM C

E
CONTENTS
PRECAUTION ........................................................... 3 . LOW-FUEL WARNING LAMP ............................ 24 . F
Precautions for Supplemental Restraint System Communication Line Inspection ............................ 24 .
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- Fuel Gauge Pointer Fluctuates, Indicates Wrong
SIONER" ................................................................. 3
. Value, or Varies ..................................................... 27
. G
PREPARATION .......................................................... 4 . Fuel Gauge Does Not Move to Full-position .......... 27 .
Commercial Service Tool ........................................ 4 . Electrical Components Inspection ......................... 28 .
COMBINATION METERS .......................................... 5 . FUEL LEVEL SENSOR UNIT CHECK ............... 28 .
H
System Description ................................................. 5 . Combination Meter ................................................ 28.
UNIFIED METER CONTROL UNIT ..................... 5 . REMOVAL AND INSTALLATION ....................... 28 .
UNIFIED METER AND A/C AMP. ........................ 5 . UNIFIED METER AND A/C AMP ............................. 29 .
HOW TO CHANGE THE DISPLAY FOR ODO/ System Description ................................................ 29
. I
TRIP METER ....................................................... 6 . INPUT/OUTPUT SIGNALS ................................ 29 .
POWER SUPPLY AND GROUND CIRCUIT ....... 7 . FAIL-SAFE ......................................................... 30
.
WATER TEMPERATURE GAUGE ....................... 7 . CAN Communication System Description ............. 30 . J
TACHOMETER .................................................... 7 . Schematic .............................................................. 31
.
FUEL GAUGE ...................................................... 7 . CONSULT-II Function (METER A/C AMP) ............ 32 .
SPEEDOMETER .................................................. 7 . CONSULT-II BASIC OPERATION ...................... 32 . DI
Component Parts and Harness Connector Location 8 ..... SELF-DIAGNOSTIC RESULTS .......................... 33 .
Combination Meter .................................................. 9 . DATA MONITOR ................................................ 33 .
CHECK ................................................................. 9
. Unified Meter and A/C Amp. .................................. 35 .
Circuit Diagram ..................................................... 10. REMOVAL AND INSTALLATION ....................... 35 . L
Wiring Diagram -- METER -- ................................11 . COMPASS ................................................................ 36
.
Terminals and Reference Value for Combination System Description ................................................ 36
.
Meter ..................................................................... 13
. POWER SUPPLY AND GROUND CIRCUIT ...... 36 . M
Terminals and Reference Value for Unified Meter CALIBRATION .................................................... 36.
and A/C Amp. ........................................................ 14. Wiring Diagram -- COMPAS -- ............................ 37 .
Meter/Gauge Operation and Odo/Trip Meter ........ 15 . Trouble Diagnoses ................................................ 38.
SELF-DIAGNOSIS FUNCTION ......................... 15 . COMPASS INSPECTION ................................... 38 .
HOW TO ALTERNATE DIAGNOSIS MODE ...... 15 . Zone Variation Change Procedure ........................ 39 .
CONSULT-II Function ........................................... 15 . CALIBRATION FUNCTION OF COMPASS ....... 39 .
How to Proceed With Trouble Diagnosis ............... 16 . WARNING LAMPS ................................................... 40 .
Diagnosis Flow ...................................................... 16. Schematic .............................................................. 40
.
Power Supply and Ground Circuit Inspection ....... 17 . Wiring Diagram -- WARN -- ................................. 41 .
Symptom Chart ..................................................... 19 . Oil Pressure Warning Lamp Stays Off (Ignition
Vehicle Speed Signal Inspection ........................... 20 . Switch ON) ............................................................ 47
.
Engine Speed Signal Inspection ........................... 21 . Oil Pressure Warning Lamp Does Not Turn Off (Oil
Water Temperature Signal Inspection ................... 22 . Pressure Is Normal) ............................................... 48
.
Fuel Level Sensor Signal Inspection 1 .................. 23 . Component Inspection ........................................... 49 .
FUEL GAUGE .................................................... 23 . OIL PRESSURE SWITCH .................................. 49 .
Fuel Level Sensor Signal Inspection 2 .................. 24 . A/T INDICATOR ....................................................... 50
.

Revision: October 2006 DI-1 2006 Maxima
Wiring Diagram -- AT/IND -- ................................ 50 . How to Proceed With Trouble Diagnosis ...............60 .
............................................................................ 50
. Preliminary Check ..................................................60 .
Trouble Diagnosis .................................................. 51 . INSPECTION FOR POWER SUPPLY AND
A/T Indicator Does Not Illuminate .......................... 51 . GROUND CIRCUIT ............................................60 .
WARNING CHIME .................................................... 53 . CONSULT-II Function (BCM) .................................62 .
Component Parts and Harness Connector Location 53 ... CONSULT-II BASIC OPERATION PROCEDURE
System Description ................................................ 53 . ...62
FUNCTION ......................................................... 53 . DATA MONITOR .................................................63 .
IGNITION KEY WARNING CHIME ..................... 54 . ACTIVE TEST .....................................................63 .
LIGHT WARNING CHIME .................................. 54 . SELF-DIAGNOSTIC RESULTS ..........................63 .
SEAT BELT WARNING CHIME .......................... 54 . All Warning Chimes Do Not Operate .....................64 .
CAN Communication System Description ............. 55 . Key Warning Chime and Light Warning Chime Do
Wiring Diagram -- CHIME -- ................................ 56 . Not Operate (Seat Belt Warning Chime Does Oper-
Terminals and Reference Value for BCM ............... 58 . ate) .........................................................................65
.
Terminals and Reference Value for Unified Meter Key Warning Chime Does Not Operate .................66 .
and A/C Amp. ........................................................ 59 . Light Warning Chime Does Not Operate ................68 .
Terminals and Reference Value for Combination Seat Belt Warning Chime Does Not Operate .........69 .
Meter ..................................................................... 59
.

Revision: October 2006 DI-2 2006 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
q 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
q 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
q 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: October 2006 DI-3 2006 Maxima
PREPARATION

PREPARATION PFP:00002

Commercial Service Tool EKS0092V

Tool name Description
Power tool Loosening bolts and nuts

PBIC0191E

Revision: October 2006 DI-4 2006 Maxima
COMBINATION METERS

COMBINATION METERS PFP:24814
A
System Description EKS0092W

UNIFIED METER CONTROL UNIT
q Speedometer, odo/trip meter, tachometer, fuel gauge and water temperature gauge are controlled by the B
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.
q 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. C
q Digital meter is adopted for odo/trip meter.*
*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. D
q Odo/trip meter and A/T indicator segments can be checked in diagnosis mode.
q Meters/gauges can be checked in diagnosis mode.
E
Illumination control
The unified meter control unit outputs the odo/trip meter and A/T 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 F
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-177, "System Description" .
G
UNIFIED METER AND A/C AMP.
For unified meter and A/C amp. system description information, refer to DI-29, "System Description" .
H

Revision: October 2006 DI-5 2006 Maxima
COMBINATION METERS

HOW TO CHANGE THE DISPLAY FOR ODO/TRIP METER
q The vehicle speed signal and the memory signals from the meter memory circuit are processed by the
combination meter and the mileage is displayed.
q Depressing the odo/trip meter switch toggles the mode in the following order.

SEL175W

q The odo/trip meter display mode toggling and trip display reset-
ting can be identified by the amount of time that elapses from
pressing the odo/trip meter switch (1) to releasing it.
q When resetting with trip A displayed, only trip A display is reset.
(Trip B operates the same way.)

WKIA4361E

Revision: October 2006 DI-6 2006 Maxima
COMBINATION METERS

POWER SUPPLY AND GROUND CIRCUIT
Power is supplied at all times A
q through 10A fuse [No.19, located in the fuse block (J/B)]
q to combination meter terminal 24, and
B
q to unified meter and A/C amp. terminal 21.
With the ignition switch in the ON or START position, power is supplied
q through 10A fuse [No.14, located in the fuse block (J/B)] C
q to combination meter terminal 23, and
q through 10A fuse [No.12, located in the fuse block (J/B)]
q to unified meter and A/C amp. terminal 22. D
With the ignition switch in the ON position, power is supplied
q through 15A fuse [No.10, located in the fuse block (J/B)], and
q through 15A fuse [No.11, located in the fuse block (J/B)] E
q to unified meter and A/C amp. terminal 46.
With the ignition switch in the ACC or ON position, power is supplied
F
q through 10A fuse [No. 6, located in the fuse block (J/B)]
q to combination meter terminal 6, and
q to unified meter and A/C amp. terminal 35. G
Ground is supplied
q to combination meter terminals 10, 11 and 12, and
q to unified meter and A/C amp. terminals 29 and 30 H
q through body grounds M57, M61 and M79.
WATER TEMPERATURE GAUGE
I
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. J

TACHOMETER
The tachometer indicates engine speed in revolutions per minute (rpm). DI
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.
L
FUEL GAUGE
The fuel gauge indicates the approximate fuel level in the fuel tank.
The fuel gauge is regulated by a variable ground signal supplied M
q from unified meter and A/C amp. terminal 36
q through the fuel level sensor unit and fuel pump terminal 5
q through the fuel level sensor unit and fuel pump terminal 2
q to unified meter and A/C amp. terminal 28 for the fuel gauge.
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
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
communication line.

Revision: October 2006 DI-7 2006 Maxima
COMBINATION METERS

Component Parts and Harness Connector Location EKS0092X

WKIA4359E

1. Fuse block (J/B) 2. Combination meter M24 3. Unified meter and A/C amp. M49,
M50, M89
4. ABS actuator and electric unit (con- 5. ECM M82 (view with glove box 6. Fuel level sensor unit and fuel pump
trol unit) E125 (engine removed for removed) B16 (view with rear seat and inspec-
clarity) tion hole cover removed)

Revision: October 2006 DI-8 2006 Maxima
COMBINATION METERS

Combination Meter EKS0092Y

CHECK A

WKIA4360E

Revision: October 2006 DI-9 2006 Maxima
COMBINATION METERS

Circuit Diagram EKS0092Z

WKWA3347E

Revision: October 2006 DI-10 2006 Maxima
COMBINATION METERS

Wiring Diagram -- METER -- EKS00930

WKWA3348E

Revision: October 2006 DI-11 2006 Maxima
COMBINATION METERS

WKWA3349E

Revision: October 2006 DI-12 2006 Maxima
COMBINATION METERS

Terminals and Reference Value for Combination Meter EKS00931

A
Condition
Terminal Wire Reference value (V)
Item Ignition
No. color Operation or condition (Approx.)
switch
B
Ignition switch ACC or
6 V ON -- Battery voltage
ON
10 B Ground OFF -- 0 C
11 B Ground OFF -- 0
12 B Ground OFF -- 0
Refer to LT-178, "ILLUMINATION D
Illumination control switch
13 R/L -- -- OPERATION BY LIGHTING
(+)
SWITCH" .
When brightness level is E
about midway.

Lighting switch ON
F
14 R/Y Illumination signal ON

G
SKIA5872E

Lighting switch OFF 0
H

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

PKIA1935E
J

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

SKIA3362E
L

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

SKIA3361E

Ignition switch ON or
23 O ON -- Battery voltage
START
24 Y/R Battery power supply OFF -- Battery voltage

Revision: October 2006 DI-13 2006 Maxima
COMBINATION METERS

Terminals and Reference Value for Unified Meter and A/C Amp. EKS00932

Condition
Terminal Wire Reference value (V)
Item Ignition
No. color Operation or condition (Approx.)
switch
1 L CAN-H -- -- --

TX communication line
9 L/W ON --
(To combination meter)

SKIA3362E

11 P CAN-L -- -- --

RX communication line
19 BR/Y ON --
(From combination meter)

SKIA3361E

21 Y/R Battery power supply OFF -- Battery voltage
Ignition switch ON or
22 G ON -- Battery voltage
START

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

PKIA1935E

Refer to DI-28, "FUEL LEVEL SEN-
28 L Fuel level sensor signal -- --
SOR UNIT CHECK" .
29 B Ground (For power) OFF -- 0
30 B Ground OFF -- 0
Ignition switch ACC or
35 V ON -- Battery voltage
ON
Fuel level sensor signal
36 B/R -- -- --
ground
46 W/L Ignition switch ON ON -- Battery voltage

Revision: October 2006 DI-14 2006 Maxima
COMBINATION METERS

Meter/Gauge Operation and Odo/Trip Meter EKS00933

SELF-DIAGNOSIS FUNCTION A
q Odo/trip meter segment and A/T indicator segment operation can be checked in self-diagnosis mode.
q Meters/gauges can be checked in self-diagnosis mode.
B
HOW TO ALTERNATE DIAGNOSIS MODE
1. Turn ignition switch ON, and switch the odo/trip meter to "trip A" or "trip B".
NOTE: C
If the diagnosis function is activated with the trip meter A displayed, the mileage on the trip meter A will
indicate 0000.0 miles, but the actual trip mileage will be retained. (Trip B operates the same way.)
2. Turn ignition switch OFF.
D
3. While pushing the odo/trip meter switch (1), turn ignition switch
ON again.
4. Make sure the trip meter displays "0000.0". E
5. Push the odo/trip meter switch (1) at least 3 times within 5 sec-
onds.
6. All the segments on the odo/trip meter and A/T indicator illumi- F
nate, and simultaneously the low-fuel warning lamp indicator
illuminates. At this time, the unified meter control unit is turned
to diagnosis mode.
G
NOTE: WKIA4361E
If any of the segments are not displayed, replace the combina-
tion meter.
H

WKIA0412E
DI

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

WKIA4362E

CONSULT-II Function EKS00934

Refer to DI-32, "CONSULT-II Function (METER A/C AMP)" in "UNIFIED METER AND A/C AMP".

Revision: October 2006 DI-15 2006 Maxima
COMBINATION METERS

How to Proceed With Trouble Diagnosis EKS00935

1. Confirm the symptom or customer complaint.
2. Perform diagnosis according to diagnosis flow. Refer to DI-16, "Diagnosis Flow" .
3. According to the symptom chart, repair or replace the cause of the symptom.
4. Does the meter operate normally? If so, go to 5. If not, go to 2.
5. Inspection End.
Diagnosis Flow 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-33, "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-17, "Power Supply and
Ground Circuit Inspection" .

3. CHECK SELF-DIAGNOSIS OPERATION OF COMBINATION METER
Perform combination meter self-diagnosis. Refer to DI-15, "SELF-DIAGNOSIS FUNCTION" .
Does self-diagnosis function operate?
YES >> GO TO 4.
NO >> Check combination meter power supply and ground circuit. Refer to DI-17, "Power Supply and
Ground Circuit Inspection" .

4. CHECK ODO/TRIP METER OPERATION
Check segment display status of odo/trip meter.
Is the display normal?
YES >> GO TO 5.
NO >> Replace the combination meter. Refer to DI-28, "Combi-
nation Meter" .

SEL176W

Revision: October 2006 DI-16 2006 Maxima
COMBINATION METERS

5. CHECK LOW-FUEL WARNING LAMP ILLUMINATION CONFIRMATION A
During low-fuel warning lamp check, confirm illumination of low-fuel warning lamp.
Condition of odo/trip
Low-fuel warning lamp B
meter switch
Pushed Does not illuminate.
Released Illuminates. C
OK or NG
OK >> GO TO 6.
NG >> Replace the combination meter. Refer to DI-28, "Combination Meter" . D

6. CHECK COMBINATION METER CIRCUIT
Check indication of each meter/gauge in self-diagnosis mode. E
OK or NG
OK >> Go to DI-19, "Symptom Chart" .
NG >> Replace the combination meter. Refer to DI-28, "Combi- F
nation Meter" .

H
WKIA4362E

Power Supply and Ground Circuit Inspection EKS00937

1. CHECK FUSE I

Check for blown combination meter and unified meter and A/C amp. fuses.
Unit Power source Fuse No. J
Combination meter
Battery 19
Unified meter and A/C amp.
DI
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 L
Combination meter
Ignition switch ACC or ON 6
Unified meter and A/C amp.
Refer to DI-11, "Wiring Diagram -- METER --" .
M
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: October 2006 DI-17 2006 Maxima
COMBINATION METERS

2. CHECK POWER SUPPLY CIRCUIT
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
terminals and ground.
Terminals Ignition switch position
(+)
Combination (

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