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Page 4166 of 4210

INFINITI QX56 2010 Factory Service Manual BCM (BODY CONTROL MODULE)WW-45
< ECU DIAGNOSIS >
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Te r m i n a l Wire
color Signal name Signal
input/
output Measuring condition
Reference value or waveform
(Approx.)

Page 4167 of 4210

INFINITI QX56 2010 Factory Service Manual WW-46
< ECU DIAGNOSIS >
BCM (BODY CONTROL MODULE)
19 V/WRemote keyless entry
receiver (power sup-
ply) Output OFF Ignition switch OFF
20 G/W Remote keyless entry
receiver (signal) Input OFFStand-by

Page 4168 of 4210

INFINITI QX56 2010 Factory Service Manual BCM (BODY CONTROL MODULE)WW-47
< ECU DIAGNOSIS >
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28 L/R Front blower monitor Input ON Front blower motor OFF Battery voltage
Front blower motor ON
0V
29 W/B Hazard swit

Page 4169 of 4210

INFINITI QX56 2010 Factory Service Manual WW-48
< ECU DIAGNOSIS >
BCM (BODY CONTROL MODULE)
44 ORear wiper auto stop
switch 1 Input ONRise up position (rear wiper
arm on stopper)
0V
A Position (full clockwise stop
position) Battery voltage

Page 4170 of 4210

INFINITI QX56 2010 Factory Service Manual BCM (BODY CONTROL MODULE)WW-49
< ECU DIAGNOSIS >
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58 W/R Optical sensor Input ONWhen optical sensor is illumi-
nated
3.1V or more
When optical sensor is not illu-
minate

Page 4176 of 4210

INFINITI QX56 2010 Factory Service Manual BCM (BODY CONTROL MODULE)WW-55
< ECU DIAGNOSIS >
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DTC Inspection Priority ChartINFOID:0000000005369220
If some DTCs are displayed at the same time, perform inspections o

BCM (BODY CONTROL MODULE)WW-55
< ECU DIAGNOSIS >
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DTC Inspection Priority ChartINFOID:0000000005369220
If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
DTC IndexINFOID:0000000005369221
NOTE: Details of time display
• CRNT: Displays when there is a malfunction now or after returning to the normal condition until turning igni- tion switch OFF → ON again.
• 1 - 39: Displayed if any previous ma lfunction is present when current conditi on is normal. It increases like 1
→ 2 → 3...38 → 39 after returning to the normal condition whenever ignition switch OFF → ON. The counter
remains at 39 even if the number of cycles exceeds it. It is counted from 1 again when turning ignition switch
OFF → ON after returning to the normal condi tion if the malfunction is detected again.
Display contents of CONSULT Fail-safe Cancellation
U1000: CAN COMM CIRCUIT I nhibit engine crankingWhen the BCM re-establishes communication with the other mod-
ules.
Priority
DTC
1 • U1000: CAN COMM CIRCUIT
2 • B2190: NATS ANTENNA AMP
• B2191: DIFFERENCE OF KEY
• B2192: ID DISCORD BCM-ECM
• B2193: CHAIN OF BCM-ECM
• B2013: STRG COMM 1
• B2552: INTELLIGENT KEY
• B2590: NATS MALFUNCTION
3 • C1729: VHCL SPEED SIG ERR
• C1735: IGNITION SIGNAL
4 • C1708: [NO DATA] FL
• C1709: [NO DATA] FR
• C1710: [NO DATA] RR
• C1711: [NO DATA] RL
• C1712: [CHECKSUM ERR] FL
• C1713: [CHECKSUM ERR] FR
• C1714: [CHECKSUM ERR] RR
• C1715: [CHECKSUM ERR] RL
• C1716: [PRESSDATA ERR] FL
• C1717: [PRESSDATA ERR] FR
• C1718: [PRESSDATA ERR] RR
• C1719: [PRESSDATA ERR] RL
• C1720: [CODE ERR] FL
• C1721: [CODE ERR] FR
• C1722: [CODE ERR] RR
• C1723: [CODE ERR] RL
• C1724: [BATT VOLT LOW] FL
• C1725: [BATT VOLT LOW] FR
• C1726: [BATT VOLT LOW] RR
• C1727: [BATT VOLT LOW] RL
CONSULT display
Fail-safeIntelligent Key
warning lamp ON Tire pressure
monitor warning lamp ON Reference page
No DTC is detected.
further testing
may be required. ————
U1000: CAN COMM CIRCUIT ———BCS-32
B2190: NATS ANTENNA AMP ———SEC-31
Revision: April 20092010 QX56

Page 4190 of 4210

INFINITI QX56 2010 Factory Service Manual IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
WW-69
< ECU DIAGNOSIS >
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If No CAN Communication Is Available With BCM
IGNITION RELAY MALFUNCTION DETECTION

IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
WW-69
< ECU DIAGNOSIS >
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If No CAN Communication Is Available With BCM
IGNITION RELAY MALFUNCTION DETECTION FUNCTION
• IPDM E/R monitors the voltage at the contact circuit and excitation coil circuit of the ignition relay inside it.
• IPDM E/R judges the ignition relay error if the voltage differs between the contact circuit and the excitation
coil circuit.
• If the ignition relay cannot turn OFF due to contact seizure, it activates the tail lamp relay for 10 minutes to alert the user to the ignition relay malfunction when the ignition switch is turned OFF.
NOTE:
The tail lamp turns OFF when the ignition switch is turned ON.
FRONT WIPER CONTROL
IPDM E/R detects front wiper stop posit ion by a front wiper auto stop signal.
When a front wiper auto stop signal is in the conditions listed below, IPDM E/R stops power supply to wiper
after repeating a front wiper 10 second activation and 20 second stop five times.
NOTE:
This operation status can be confirmed on the IPDM E/R “DATA MONITOR” that displays “Block” for the item
“WIP PROT” while the wiper is stopped.
STARTER MOTOR PROTECTION FUNCTION
IPDM E/R turns OFF the starter control relay to protect the starter motor when the starter control relay remains
active for 90 seconds.
Control part Fail-safe in operation
Cooling fan • Turns ON the cooling fan relay when the ignition switch is turned ON
• Turns OFF the cooling fan relay when the ignition switch is turned OFF
Control part
Fail-safe in operation
Headlamp • Turns ON the headlamp low relay when the ignition switch is turned ON
• Turns OFF the headlamp low relay when the ignition switch is turned OFF
• Headlamp high LH/RH relays OFF
•Parking lamps
• License plate lamps
• Tail lamps • Turns ON the tail lamp relay when the ignition switch is turned ON
• Turns OFF the tail lamp relay when the ignition switch is turned OFF
Front wiper • The status just before activation of fail-safe control is maintained until the ignition
switch is turned OFF while the front wiper is operating at LO or HI speed.
• The wiper is operated at LO speed until the ignition switch is turned OFF if the fail- safe control is activated while the front wipe r is set in the INT mode and the front wiper
motor is operating.
Rear window defogger Rear window defogger relay OFF
A/C compressor A/C relay OFF
Front fog lamps Front fog lamp relay OFF
Ignition switch Ignition relayTail lamp relay
ON ON —
OFF OFF —
Ignition switchFront wiper switch Auto stop signal
ON OFF
Front wiper stop position signal cannot be
input 10 seconds.
ON The signal does not change for 10 seconds.
Revision: April 20092010 QX56

Page 4193 of 4210

INFINITI QX56 2010 Factory Service Manual WW-72
< SYMPTOM DIAGNOSIS >
WIPER AND WASHER SYSTEM SYMPTOMS
Front wiper does not
stop.HI only
• Combination switch
•BCM
Combination switch
Refer to BCS-56, "
Symptom
Ta b l e".
Front wiper requ

WW-72
< SYMPTOM DIAGNOSIS >
WIPER AND WASHER SYSTEM SYMPTOMS
Front wiper does not
stop.HI only
• Combination switch
•BCM
Combination switch
Refer to BCS-56, "
Symptom
Ta b l e".
Front wiper request signal
•BCM
• IPDM E/R IPDM E/R DATA MONITOR
"FR WIP REQ"
IPDM E/R —
LO only • Combination switch
•BCM
Combination switch
Refer to BCS-56, "
Symptom
Ta b l e".
Front wiper request signal
•BCM
• IPDM E/R IPDM E/R DATA MONITOR
"FR WIP REQ"
IPDM E/R —
INT only • Combination switch
•BCM
Combination switch
Refer to BCS-56, "
Symptom
Ta b l e".
Front wiper request signal
•BCM
• IPDM E/R IPDM E/R DATA MONITOR
"FR WIP REQ"
Front wiper does not
operate normally. Intermittent adjustment
cannot be performed.
• Combination switch
• Harness between combination switch and BCM
•BCM
Combination switch
Refer to BCS-56, "
Symptom
Ta b l e".
BCM —
Intermittent control
linked with vehicle
speed cannot be per-
formed. Check the vehicle speed detection wiper setting.
Refer to
BCS-23, "
WIPER : CONSULT-III Function (BCM - WIPER)".
Wiper is not linked to
the washer operation. • Combination switch
• Harness between combination switch and BCM
•BCM
Combination switch
Refer to BCS-56, "
Symptom
Ta b l e".
BCM —
Does not return to stop
position (Repeatedly
operates for 10 sec-
onds and then stops
for 20 seconds. After
that, it stops the opera-
tion). • IPDM E/R
• Harness between IPDM E/R and front wiper
motor
• Front wiper motor Front wiper auto stop signal
circuit
Refer to WW-23, "
Compo-
nent Function Check".
Rear wiper does not
operate. ON only
• Combination switch
• Harness between combination switch and BCM
•BCM Combination switch
Refer to BCS-56, "
Symptom
Ta b l e".
INT only • Combination switch
• Harness between combination switch and BCM
•BCM Combination switch
Refer to BCS-56, "
Symptom
Ta b l e".
ON and INT • Combination switch
• Harness between combination switch and BCM
•BCM
Combination switch
Refer to BCS-56, "
Symptom
Ta b l e".
•BCM
• Harness between rear wiper motor and BCM
• Harness between rear wiper motor and ground
• Rear wiper motor
• Glass hatch ajar switch Combination switch
Refer to WW-28, "
Compo-
nent Function Check".
Symptom
Probable malfunction location Inspection item
Revision: April 20092010 QX56

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