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K ELECTRICAL

B
SECTION
DRIVER INFORMATION SYSTEM C

E
CONTENTS
PRECAUTION ........................................................... 3 . FUEL GAUGE .................................................... 24 . F
Precautions for Supplemental Restraint System Fuel Level Sensor Signal Inspection 2 .................. 25 .
(SRS) "AIR BAG" and "SEAT BELT PRE-TEN- LOW-FUEL WARNING LAMP ............................ 25 .
SIONER" ................................................................. 3
. Communication Line Inspection ............................ 25 . G
Wiring Diagrams and Trouble Diagnosis ................. 3 . Fuel Gauge Pointer Fluctuates, Indicates Wrong
PREPARATION .......................................................... 4 . Value, or Varies ..................................................... 28
.
Commercial Service Tool ........................................ 4 . Fuel Gauge Does Not Move to Full-position .......... 28 .
H
COMBINATION METERS .......................................... 5 . Electrical Components Inspection ......................... 29 .
System Description ................................................. 5 . FUEL LEVEL SENSOR UNIT CHECK ............... 29 .
UNIFIED METER CONTROL UNIT ..................... 5 . Removal and Installation of Combination Meter .... 29 .
UNIFIED METER AND A/C AMP. ........................ 5 . REMOVAL .......................................................... 29 . I
HOW TO CHANGE THE DISPLAY FOR ODO/ INSTALLATION .................................................. 29 .
TRIP METER ....................................................... 6 . UNIFIED METER AND A/C AMP ............................. 30 .
POWER SUPPLY AND GROUND CIRCUIT ....... 7 . System Description ................................................ 30 . J
WATER TEMPERATURE GAUGE ....................... 7 . INPUT/OUTPUT SIGNALS ................................ 30 .
TACHOMETER .................................................... 7 . FAIL-SAFE ......................................................... 31.
FUEL GAUGE ...................................................... 7 . CAN Communication System Description ............. 31 . DI
SPEEDOMETER .................................................. 7 . Schematic .............................................................. 32
.
Component Parts and Harness Connector Location 8 ..... CONSULT-II Function (METER A/C AMP) ............ 33 .
Combination Meter .................................................. 9 . CONSULT-II BASIC OPERATION ...................... 33 .
CHECK ................................................................. 9
. SELF-DIAGNOSTIC RESULTS .......................... 34 . L
Circuit Diagram ..................................................... 10. DATA MONITOR ................................................ 34 .
Wiring Diagram -- METER -- ................................11 . Removal and Installation of Unified Meter and A/C
Terminals and Reference Value for Combination Amp. ...................................................................... 36
. M
Meter ..................................................................... 13
. REMOVAL .......................................................... 36 .
Terminals and Reference Value for Unified Meter INSTALLATION .................................................. 36 .
and A/C Amp. ........................................................ 14. COMPASS ................................................................ 37
.
Meter/Gauge Operation and Odo/Trip Meter ........ 15 . System Description ................................................ 37 .
SELF-DIAGNOSIS FUNCTION ......................... 15 . POWER SUPPLY AND GROUND CIRCUIT ...... 37 .
HOW TO ALTERNATE DIAGNOSIS MODE ...... 15 . CALIBRATION .................................................... 37 .
CONSULT-II Function ........................................... 15 . Wiring Diagram -- COMPAS -- ............................ 38 .
How to Proceed With Trouble Diagnosis ............... 16 . Trouble Diagnoses ................................................ 39 .
Diagnosis Flow ...................................................... 16. COMPASS INSPECTION ................................... 39 .
Power Supply and Ground Circuit Inspection ....... 17 . Zone Variation Change Procedure ........................ 40 .
Symptom Chart 1 .................................................. 19 . CALIBRATION FUNCTION OF COMPASS ....... 40 .
Symptom Chart 2 .................................................. 19 . WARNING LAMPS ................................................... 41 .
Vehicle Speed Signal Inspection ........................... 20 . Schematic .............................................................. 41
.
Engine Speed Signal Inspection ........................... 22 . Wiring Diagram -- WARN -- ................................. 42 .
Water Temperature Signal Inspection ................... 23 . Oil Pressure Warning Lamp Stays Off (Ignition
Fuel Level Sensor Signal Inspection 1 .................. 24 . Switch ON) ............................................................ 47
.

Revision: July 2005 DI-1 2005 Maxima
Oil Pressure Warning Lamp Does Not Turn Off (Oil and A/C Amp. .........................................................58 .
Pressure Is Normal) ............................................... 48 . Terminals and Reference Value for Combination
Component Inspection ........................................... 49 . Meter ......................................................................58
.
OIL PRESSURE SWITCH .................................. 49 . How to Proceed With Trouble Diagnosis ...............59 .
A/T INDICATOR ....................................................... 50 . Preliminary Check ..................................................59 .
Wiring Diagram -- AT/IND -- ................................ 50 . INSPECTION FOR POWER SUPPLY AND
............................................................................ 50
. GROUND CIRCUIT ............................................59 .
Trouble Diagnosis .................................................. 51 . CONSULT-II Function (BCM) .................................61 .
A/T Indicator Does Not Illuminate .......................... 51 . CONSULT-II BASIC OPERATION PROCEDURE
WARNING CHIME .................................................... 53 . ...61
Component Parts and Harness Connector Location 53 ... DATA MONITOR .................................................62 .
System Description ................................................ 53 . ACTIVE TEST .....................................................62 .
FUNCTION ......................................................... 53 . SELF-DIAGNOSTIC RESULTS ..........................62 .
IGNITION KEY WARNING CHIME ..................... 53 . All Warning Chimes Do Not Operate .....................63 .
LIGHT WARNING CHIME .................................. 54 . Key Warning Chime and Light Warning Chime Do
SEAT BELT WARNING CHIME .......................... 54 . Not Operate (Seat Belt Warning Chime Does Oper-
CAN Communication System Description ............. 54 . ate) .........................................................................64
.
Wiring Diagram -- CHIME -- ................................ 55 . Key Warning Chime Does Not Operate .................65 .
Terminals and Reference Value for BCM ............... 57 . Light Warning Chime Does Not Operate ................67 .
Terminals and Reference Value for Unified Meter Seat Belt Warning Chime Does Not Operate .........68 .

Revision: July 2005 DI-2 2005 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
Wiring Diagrams and Trouble Diagnosis EKS0092U

When you read wiring diagrams, refer to the following:
H
q Refer to GI-13, "How to Read Wiring Diagrams" .
q Refer to PG-4, "POWER SUPPLY ROUTING CIRCUIT" for power distribution circuit.
When you perform trouble diagnosis, refer to the following: I
q Refer to GI-10, "HOW TO FOLLOW TEST GROUPS IN TROUBLE DIAGNOSES" .
q Refer to GI-25, "How to Perform Efficient Diagnosis for an Electrical Incident" .
J

Revision: July 2005 DI-3 2005 Maxima
PREPARATION

PREPARATION PFP:00002

Commercial Service Tool EKS0092V

Tool name Description
Loosening bolts and nuts

Power tool

PBIC0191E

Revision: July 2005 DI-4 2005 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-174, "System Description" .
G
UNIFIED METER AND A/C AMP.
For unified meter and A/C amp. system description information, refer to DI-30, "System Description" .
H

Revision: July 2005 DI-5 2005 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 to releasing it.
q When resetting with trip A displayed, only trip A display is reset.
(Trip B operates the same way.)

WKIA0411E

Revision: July 2005 DI-6 2005 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.
Ground is supplied
F
q to combination meter terminals 10, 11 and 12, and
q to unified meter and A/C amp. terminals 29 and 30
q through body grounds M57, M61 and M79. G
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- H
fied meter and A/C amp. provides a water temperature signal to combination meter for water temperature
gauge via communication line between unified meter and A/C amp. and combination meter.
TACHOMETER I
The tachometer indicates engine speed in revolutions per minute (rpm).
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 J
lines between unified meter and A/C amp. and combination meter.
FUEL GAUGE
DI
The fuel gauge indicates the approximate fuel level in the fuel tank.
The fuel gauge is regulated by a variable ground signal supplied
q from unified meter and A/C amp. terminal 36
L
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. M
Unified meter and A/C amp. provides a fuel level signal to combination meter for fuel gauge via communica-
tion line 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: July 2005 DI-7 2005 Maxima
COMBINATION METERS

Component Parts and Harness Connector Location EKS0092X

WKIA2970E

Revision: July 2005 DI-8 2005 Maxima
COMBINATION METERS

Combination Meter EKS0092Y

CHECK A

LKIA0242E

Revision: July 2005 DI-9 2005 Maxima
COMBINATION METERS

Circuit Diagram EKS0092Z

LKWA0179E

Revision: July 2005 DI-10 2005 Maxima
COMBINATION METERS

Wiring Diagram -- METER -- EKS00930

WKWA1645E

Revision: July 2005 DI-11 2005 Maxima
COMBINATION METERS

WKWA1646E

Revision: July 2005 DI-12 2005 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
10 B Ground ON -- 0
11 B Ground ON -- 0
12 B Ground ON -- 0 C
Refer to LT-175, "ILLUMINATION
Illumination control switch
13 R/L -- -- OPERATION BY LIGHTING
(+)
SWITCH" . D
When brightness level is
about midway.
E
Lighting switch ON
14 R/Y Illumination signal ON
F

SKIA5872E

Lighting switch OFF 0 G

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

I
PKIA1935E

J
RX communication line
21 L/W (From unified meter and ON --
A/C amp.)
DI
SKIA3362E

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

SKIA3361E

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

Revision: July 2005 DI-13 2005 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-29, "FUEL LEVEL SEN-
28 L Fuel level sensor signal -- --
SOR UNIT CHECK" .
29 B Ground (For power) ON -- 0
30 B Ground ON -- 0
Fuel level sensor signal
36 B/R -- -- --
ground
46 W/L Ignition switch ON ON -- Battery voltage

Revision: July 2005 DI-14 2005 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, turn ignition switch ON
again.
4. Make sure the trip meter displays "0000.0". E
5. Push the odo/trip meter switch at least 3 times within 5 seconds.
6. All the segments on the odo/trip meter and A/T indicator illumi-
nate, and simultaneously the low-fuel warning lamp indicator F
illuminates. At this time, the unified meter control unit is turned
to diagnosis mode.
NOTE:
G
If any of the segments are not displayed, replace the combina- WKIA0411E
tion meter.

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.
(At this time, the low-fuel warning lamp goes off.) L

LKIA0243E

CONSULT-II Function EKS00934

Refer to DI-33, "CONSULT-II Function (METER A/C AMP)" in "UNIFIED METER AND A/C AMP".

Revision: July 2005 DI-15 2005 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-33, "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-19, "Symptom Chart 2" .

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-29,
"Removal and Installation of Combination Meter" .

SEL176W

Revision: July 2005 DI-16 2005 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-29, "Removal and Installation of 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 1" .
NG >> Replace the combination meter. Refer to DI-29, F
"Removal and Installation of Combination Meter" .

H
LKIA0243E

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
Refer to DI-11, "Wiring Diagram -- METER --" .
OK or NG
OK >> GO TO 2. M
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: July 2005 DI-17 2005 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
(+)
Terminal (

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