2009 INFINITI QX56 Factory Service Manual

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INFINITI QX56 2009 Factory Service Manual
BCS
DIAGNOSIS SYSTEM (BCM)BCS-27
< FUNCTION DIAGNOSIS > [BCM]
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AIR PRESSURE MONITOR
AIR PRESSURE MONITOR : Diagnosis DescriptionINFOID:0000000003776404
DESCRIPTION
During

BCS
DIAGNOSIS SYSTEM (BCM)BCS-27
< FUNCTION DIAGNOSIS > [BCM]
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AIR PRESSURE MONITOR
AIR PRESSURE MONITOR : Diagnosis DescriptionINFOID:0000000003776404
DESCRIPTION
During driving, the TPMS receives the signal transmitt
ed from the transmitter installed in each wheel, when
the tire pressure becomes low. The control unit (BC M) of this system has pressure judgment and trouble diag-
nosis functions.
When the TPMS detects low inflation pressure or anot her unusual symptom, the warning lamps in the combi-
nation meter comes on.
SELF DIAGNOSTIC PROCE DURE (WITH CONSULT-III)
With CONSULT-III
Touch “SELF-DIAG RESULTS” display to show malf unction experienced since the last erasing operation.
Refer to BCS-51, "DTC Index"
.
SELF DIAGNOSTIC PROCE DURE (WITHOUT CONSULT-III)
Without CONSULT-III
To start the self-diagnostic results mode, ground terminal of the tire pressure warning check connector. The
malfunction location is indicated by the warning lamp flashing.
NOTE:
When the low tire warning lamp flashes 5 Hz and continues repeating it, the system is normal.
Test Item Operation Description
OIL PRESSURE SW OFF OFF
ON
BCM transmits the oil pressure switch signal to the combination meter via CAN communica-
tion, which operates the oil pressure gauge in the combination meter.
SEIA0745E
Flickering
pattern Items Diagnostic items detected when··· Check item
15 Tire pressure value (Front LH) Front LH tire pressure drops to 181 kPa (1.8 kg/cm, 25.25 psi) or less.
–
16 Tire pressure value (Front RH) Front RH tire pressure drops to 181 kPa (1.8 kg/cm, 25.25 psi) or less.
17 Tire pressure value (Rear RH) Rear RH tire pressure drops to 181 kPa (1.8 kg/cm, 25.25 psi) or less.
18 Tire pressure value (Rear LH) Rear LH tire pressure drops to 181 kPa (1.8 kg/cm, 25.25 psi) or less.
21 Transmitter no data (Front LH) Data from front LH transmitter can not be received.
WT-27
22 Transmitter no data (Front RH) Data from front RH transmitter can not be received.
23 Transmitter no data (Rear RH) Data from Rear RH transmitter can not be received.
24 Transmitter no data (Rear LH) Data from Rear LH transmitter can not be received.
Revision: December 20092009 QX56

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INFINITI QX56 2009 Factory Service Manual
BCS-28
< FUNCTION DIAGNOSIS >[BCM]
DIAGNOSIS SYSTEM (BCM)
ERASE SELF-DIAGNOSIS
With CONSULT-III
1. Perform applicable inspection of malfunctioning item and then repair or replace.
2. Turn ignition s

BCS-28
< FUNCTION DIAGNOSIS >[BCM]
DIAGNOSIS SYSTEM (BCM)
ERASE SELF-DIAGNOSIS
With CONSULT-III
1. Perform applicable inspection of malfunctioning item and then repair or replace.
2. Turn ignition switch “ON” and select “SELF-DIAG
RESULTS” mode for “AIR PRESSURE MONITOR” with
CONSULTIII.
3. Touch “ERASE” on CONSULT-III screen to erase memory.
Without CONSULT-III
In order to make it easier to find the cause of hard-to-duplicate malfunctions, malfunction information is
stored into the control unit as necessary during use by the user. This memory is not erased no matter how
many times the ignition switch is turned “ON” and“OFF”.
However, this information is erased by turning igniti on switch “OFF” after performing self-diagnostic or by
erasing the memory using the CONSULT-III.
AIR PRESSURE MONITOR : CONSULT-III FunctionINFOID:0000000003776405
WORK SUPPORT MODE
31Transmitter ch
ecksum error
(Front LH) Checksum data from front LH transmitter is malfunctioning.
WT-27
32Transmitter ch
ecksum error
(Front RH) Checksum data from front RH transmitter is malfunctioning.
33 Transmitter ch
ecksum error
(Rear RH) Checksum data from rear RH transmitter is malfunctioning.
34 Transmitter ch
ecksum error
(Rear LH) Checksum data from rear RH transmitter is malfunctioning.
35 Transmitter pressure data error
(Front LH) Air pressure data from front LH transmitter is malfunction.
WT-27
36Transmitter pressure data error
(Front RH) Air pressure data from front RH transmitter is malfunction.
37 Transmitter pressure data error
(Rear RH)
Air pressure data from rear RH transmitter is malfunction.
38 Transmitter pressure data error
(Rear LH) Air pressure data from rear LH transmitter is malfunction.
41 Transmitter function code error
(Front LH) Function code data from front LH transmitter is malfunction.
WT-27
42Transmitter function code error
(Front RH)
Function code data from front RH transmitter is malfunction.
43 Transmitter function code error
(Rear RH) Function code data from rear RH transmitter is malfunction.
44 Transmitter function code error
(Rear LH) Function code data from rear LH transmitter is malfunction.
45 Transmitter battery voltage low
(Front LH)
Battery voltage of front LH transmitter drops.
WT-27
46Transmitter battery voltage low
(Front RH) Battery voltage of front RH transmitter drops.
47 Transmitter battery voltage low
(Rear RH) Battery voltage of rear RH transmitter drops.
48 Transmitter battery voltage low
(Rear LH)
Battery voltage of rear LH transmitter drops.
52 Vehicle speed signal error Speed signal is not detected. WT-27
No flicker-
ing Tire pressure warning check
switch
Tire pressure warning sw
itch circuit is open. –
Flickering
pattern Items Diagnostic items detected when··· Check item
Revision: December 20092009 QX56

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INFINITI QX56 2009 Factory Service Manual
BCS
DIAGNOSIS SYSTEM (BCM)BCS-29
< FUNCTION DIAGNOSIS > [BCM]
C
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ID Read
The registered ID number is displayed.
ID Regist
Refer to
WT-6, "ID Registration Procedure".
SELF-

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INFINITI QX56 2009 Factory Service Manual
BCS-30
< COMPONENT DIAGNOSIS >[BCM]
U1000 CAN COMM CIRCUIT
COMPONENT DIAGNOSIS
U1000 CAN COMM CIRCUIT
DescriptionINFOID:0000000003776407
Refer to
LAN-44, "CAN Communication Signal Chart".
DTC LogicI

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INFINITI QX56 2009 Factory Service Manual
BCS
U1010 CONTROL UNIT (CAN)BCS-31
< COMPONENT DIAGNOSIS > [BCM]
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U1010 CONTROL UNIT (CAN)
DTC LogicINFOID:0000000003776410
DTC DETECTION LOGIC
Diagnosis ProcedureINFOID:

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INFINITI QX56 2009 Factory Service Manual
BCS-32
< COMPONENT DIAGNOSIS >[BCM]
POWER SUPPLY AND GROUND CIRCUIT
POWER SUPPLY AND GROUND CIRCUIT
Diagnosis ProcedureINFOID:0000000003776413
1. CHECK FUSES AND FUSIBLE LINK
Check that the following

Page 407 of 4171

INFINITI QX56 2009 Factory Service Manual
BCS
COMBINATION SWITCH INPUT CIRCUITBCS-33
< COMPONENT DIAGNOSIS > [BCM]
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COMBINATION SWITCH
INPUT CIRCUIT
Diagnosis ProcedureINFOID:0000000003776414
1. CHECK INPUT 1 -

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INFINITI QX56 2009 Factory Service Manual
BCS-34
< COMPONENT DIAGNOSIS >[BCM]
COMBINATION SWITCH INPUT CIRCUIT
YES >> GO TO 4
NO >> Replace BCM. Refer to
BCS-56, "Removal and Installation"
.
4. CHECK COMBINATION SWITCH
Check combination swi

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