2004 INFINITI QX56 battery

TF-90
TROUBLE DIAGNOSES FOR SYMPTOMS
Revision: August 20072004 QX56
Symptom 5. 4LO Indicator Lamp Does Not Turn ON (When 4WD shift switch is
set from 4H to 4LO position, 4LO indicator lamp does not turn ON)
EDS0018I
1. CHECK TRANSFER CONTROL UNIT POWER SUPPLY CIRCUIT
1. Disconnect battery negative terminal, then transfer control unit connectors.
2. Connect battery negative terminal and turn ignition switch ON (with engine stopped).
3. Check voltage across transfer control unit connector E142 and E143 terminals 16 (Y/R), 47 (W) and
ground.
OK or NG
OK >> GO TO 2.
NG >> Check the following.

Continuity between battery, ignition switch and trans-
fer control unit

Ignition switch. Refer to PG-4, "POWER SUPPLY
ROUTING CIRCUIT" .

No. 53 fuse (20A) and No. 49 fuse (10A)
2. CHECK TRANSFER CONTROL UNIT GROUND CIRCUIT
1. Turn ignition switch to OFF position.
2. Disconnect transfer control unit harness connectors E142 and
E143.
3. Measure resistance between transfer control unit harness con-
nectors E142 and E143 terminals 3 (B), 6 (B), 45 (B) and
ground.
OK or NG
OK >> GO TO 3.
NG >> Check continuity between transfer control unit and
ground. Voltage : Battery voltage
WDIA0071E
WDIA0081E
Resistance : Continuity should exist.
LDIA0087E

TF-96
TROUBLE DIAGNOSES FOR SYMPTOMS
Revision: August 20072004 QX56
TRANSFER DROPPING RESISTOR
Check resistance between terminals.
ATP SWITCH, NEUTRAL-4LO SWITCH AND WAIT DETECTION SWITCH
1. Remove the ATP switch, neutral-4LO switch and the wait detection switch.
2. Measure the resistance between terminals of ATP switch F55, neutral-4LO switch F60 , and wait detection
switch F59.
TRANSFER MOTOR
Apply battery voltage directly to transfer motor harness connector
F57. (Positive: Terminal 14, Negative: Terminal 15)
Transfer motor should operate.
WDIA0091E
Resistance : 11.2 - 12.8 Ω
Switch released state : Continuity should not
exist
Switch pushed state : Continuity should exist
WDIA0082E
LDIA0097E

TROUBLE DIAGNOSES FOR SYMPTOMS
TF-97
C
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F
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H
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MA
B
TF
Revision: August 20072004 QX56
TRANSFER MOTOR RELAY
1. Apply battery voltage and ground directly to transfer motor relay
E154 terminals 1 and 2.
2. Check continuity between transfer motor relay E153 terminals 3
and 5.
TRANSFER SHIFT RELAY (HIGH & LOW)
Check continuity between transfer shift high relay E46 and low relay
E47 terminals 3 and 4.
ACTUATOR AND ACTUATOR POSITION SWITCH
Actuator
Operation and resistance check

Apply battery voltage directly to actuator assembly.
Actuator Position Switch
Continuity check
Condition Continuity (3-5)
Battery voltage is applied Yes
No voltage is applied No
LDIA0098E
Condition Continuity
12V direct current supply
between terminals 1 and 2No
No current supply Yes
LDIA0099E
Operating check Battery positive terminal Battery negative terminal
121 24
224 21
Check Approx. 0.2Ω (When the motor is not operated.)
LDIA0100E
Continuity checkBattery positive
terminalBattery negative
terminalContinuity
121 24 20 - 22
224 21 23 - 22
LDIA0101E

TF-98
TRANSFER CONTROL UNIT
Revision: August 20072004 QX56
TRANSFER CONTROL UNITPFP:33084
Removal and InstallationEDS00314
REMOVAL
1. Set transfer state as 2WD when 4WD shift switch is at 2WD, or as AUTO when 4WD shift switch is at
AUTO.
CAUTION:
When removing transfer control unit, transfer state must be at 2WD or AUTO.
2. Turn the ignition switch OFF and disconnect negative battery terminal.
3. Remove the glove box assembly. Refer to IP-14, "
Instrument Lower Cover RH and Glove Box" .
4. Disconnect the two transfer control unit connectors.
5. Remove the transfer control unit bolts.
6. Remove the transfer control unit.
INSTALLATION
Installation is in the reverse order of removal.

When installing the transfer control unit, tighten bolts to the specified torque.
CAUTION:

Do not connect harness connector to transfer control unit when 4WD shift switch is at 4LO.

After the installation, check perform self-diagnosis. Refer to TF-28, "SELF-DIAGNOSTIC PROCEDURE"
. If NG, adjust position between transfer assembly and transfer control unit.
BDIA0014E
Transfer control unit bolts : 5.1 N·m (0.52 kg-m, 45 in-lb)

WT-12
TROUBLE DIAGNOSES
Revision: August 20072004 QX56
Terminal and Reference Value (BCM)EES0012A
() : Wire colorTerminal
Item ConditionVoltage (V)
(Approx.)
+–
15 (L/W)
GroundTire pressure warning check
connector—5V
18 (P)Remote keyless entry receiver
(Ground)—0V
19 (V/W)Remote keyless entry receiver
(Power supply)Ignition switch OFF
20 (G/W)Remote keyless entry receiver
signal (Signal)Stand-by (keyfob buttons
released)
When remote keyless entry
receiver receives signal from
keyfob (keyfob buttons
pressed)
38 (W/L) Ignition switch Ignition switch ON or START Battery voltage
39 (W) Data line (CAN-H) — —
40 (R) Data line (CAN-L) — —
67 (B) GND — 0V
70 (W/B) Battery power supply — Battery voltage
LIIA1893E
LIIA1894E
LIIA1895E

TROUBLE DIAGNOSES
WT-17
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WT
Revision: August 20072004 QX56
Self-DiagnosisEES0012D
DESCRIPTION
During driving, the low tire pressure warning system receives the signal transmitted from the transmitter
installed in each wheel, and gives alarms when the tire pressure becomes low. The control unit (BCM) for this
system has pressure judgement and trouble diagnosis functions.
FUNCTION
When the low tire pressure warning system detects low inflation pressure or another unusual symptom, the
warning lamp in the combination meter comes on. To start the self-diagnostic results mode, ground the tire
pressure warning check terminal. The malfunction location is indicated by the low tire pressure warning lamp
flashing and the buzzer sounding.
CONSULT-II
CONSULT-II Application to Low Tire Pressure Warning System
× : Applicable
– : Not applicable
Self-Diagnostic Results Mode
NOTE:
Before performing the self-diagnosis, be sure to register the ID or the actual malfunction location may be different from that displayed on
CONSULT-II.ITEM SELF-DIAGNOSTIC RESULTS DATA MONITOR
Front - Left transmitter××
Front - Right transmitter××
Rear - Left transmitter××
Rear - Right transmitter××
Low tire pressure warning lamp —×
Vehicle speed××
Buzzer (in combination meter) —×
CAN Communication××
Diagnostic item Diagnostic item is detected when ···
FLAT - TIRE - FL
FLAT - TIRE - FR
FLAT - TIRE - RR
FLAT - TIRE - RLFront-left tire pressure drops to 193 kPa (2.0 kg/cm
2 , 28 psi) or less
Front-right tire pressure drops to 193 kPa (2.0 kg/cm2 , 28 psi) or less
Rear-right tire pressure drops to 193 kPa (2.0 kg/cm2 , 28 psi) or less
Rear-left tire pressure drops to 193 kPa (2.0 kg/cm2 , 28 psi) or less
[NO-DATA] - FL
[NO-DATA] - FR
[NO-DATA] - RR
[NO-DATA] - RLData from front-left transmitter cannot be received.
Data from front-right transmitter cannot be received.
Data from rear-right transmitter cannot be received.
Data from rear-left transmitter cannot be received.
[CHECKSUM- ERR] - FL
[CHECKSUM- ERR] - FR
[CHECKSUM- ERR] - RR
[CHECKSUM- ERR] - RLChecksum data from front-left transmitter is malfunctioning.
Checksum data from front-right transmitter is malfunctioning.
Checksum data from rear-right transmitter is malfunctioning.
Checksum data from rear-left transmitter is malfunctioning.
[PRESSDATA- ERR] - FL
[PRESSDATA- ERR] - FR
[PRESSDATA- ERR] - RR
[PRESSDATA- ERR] - RLAir pressure data from front-left transmitter is malfunctioning.
Air pressure data from front-right transmitter is malfunctioning.
Air pressure data from rear-right transmitter is malfunctioning.
Air pressure data from rear-left transmitter is malfunctioning.
[CODE- ERR] - FL
[CODE- ERR] - FR
[CODE- ERR] - RR
[CODE- ERR] - RLFunction code data from front-left transmitter is malfunctioning.
Function code data from front-right transmitter is malfunctioning.
Function code data from rear-right transmitter is malfunctioning.
Function code data from rear-left transmitter is malfunctioning.
[BATT - VOLT - LOW] - FL
[BATT - VOLT - LOW] - FR
[BATT - VOLT - LOW] - RR
[BATT - VOLT - LOW] - RLBattery voltage of front-left transmitter drops.
Battery voltage of front-right transmitter drops.
Battery voltage of rear-right transmitter drops.
Battery voltage of rear-left transmitter drops.
VHCL_SPEED_SIG_ERR Vehicle speed signal is in error.

WT-20
TROUBLE DIAGNOSES
Revision: August 20072004 QX56
Preliminary CheckEES0012F
BASIC INSPECTION
1. CHECK ALL TIRE PRESSURES
Check all tire pressures. Refer to WT-33, "
Tire" .
OK or NG
OK >> GO TO 2.
NG >> Adjust tire pressure to specified value.
2. CHECK LOW TIRE PRESSURE WARNING LAMP ACTIVATION
Check low tire pressure warning lamp activation.
Does low tire pressure warning lamp activate for 1 second when ignition switch is turned ON?
YES >> GO TO 3.
NO >> Check fuse and combination meter.
3. CHECK CONNECTOR
1. Disconnect BCM harness connector.
2. Check terminals for damage or loose connection.
3. Reconnect harness connector.
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.
4. CHECK TRANSMITTER ACTIVATION TOOL
Check transmitter activation tool battery.
OK or NG
OK >> Carry out self-diagnosis.
NG >> Replace transmitter activation tool battery.

TROUBLE DIAGNOSES
WT-21
C
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WT
Revision: August 20072004 QX56
Malfunction Code/Symptom ChartEES0012G
Code/Symptom Malfunction partReference
page
15
16
17
18Front-left tire pressure drops to 193 kPa (2.0 kg/cm
2 , 28 psi) or less
Front-right tire pressure drops to 193 kPa (2.0 kg/cm2 , 28 psi) or less
Rear-right tire pressure drops to 193 kPa (2.0 kg/cm2 , 28 psi) or less
Rear-left tire pressure drops to 193 kPa (2.0 kg/cm2 , 28 psi) or less—
21
22
23
24Transmitter no data (front - left)
Transmitter no data (front - right)
Transmitter no data (rear - right)
Transmitter no data (rear - left)WT-23,
"Inspection 1:
Transmitter or
Control Unit
(BCM)"
31
32
33
34Transmitter checksum error (front - left)
Transmitter checksum error (front - right)
Transmitter checksum error (rear - right)
Transmitter checksum error (rear - left)WT-23,
"Inspection 2:
Tran s mitte r -
1"
35
36
37
38Transmitter pressure data error (front - left)
Transmitter pressure data error (front - right)
Transmitter pressure data error (rear - right)
Transmitter pressure data error (rear - left)WT-24,
"Inspection 3:
Tran s mitte r -
2"
41
42
43
44Transmitter function code error (front - left)
Transmitter function code error (front - right)
Transmitter function code error (rear - right)
Transmitter function code error (rear - left)WT-23,
"Inspection 2:
Tran s mitte r -
1"
45
46
47
48Transmitter battery voltage low (front - left)
Transmitter battery voltage low (front - right)
Transmitter battery voltage low (rear - right)
Transmitter battery voltage low (rear - left)WT-23,
"Inspection 2:
Tran s mitte r -
1"
52 Vehicle speed signalWT-25, "Inspection 4:
Vehicle Speed
Signal"
Low tire pressure warning lamp does
not come on when ignition switch is
turned on.Fuse or combination meter
BCM connector or circuit
BCM WT-26,
"Inspection 1:
Low Tire
Pressure
Warning
Lamp Does
Not Come On
When Ignition
Switch Is
Turned On"
Low tire pressure warning lamp stays
on when ignition switch is turned on.Combination meter
BCM connector or circuit
BCMWT-26,
"Inspection 2:
Low Tire
Pressure
Warning
Lamp Stays
On When
Ignition
Switch Is
Turned On"