2011 INFINITI QX56 relay

PCS
IPDM E/RPCS-21
< ECU DIAGNOSIS INFORMATION > [IPDM E/R]
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Fail-SafeINFOID:0000000006220173
CAN COMMUNICATION CONTROL
When CAN communication with ECM and BCM is impossible,
IPDM E/R performs fail-safe control. After CAN
communication recovers normally, it also returns to normal control.
If No CAN Communication Is Available With ECM
If No CAN Communication Is Available With BCM
66
(SB) Ground
Push-button ignition
switch InputPress the push-button ignition switch 0 V
Release the push-button ignition switch 12 V
68
(O) Ground Ignition relay monitor Input Ignition switch OFF or ACC 12 V
Ignition switch ON 0 V
69
(W/B) Ground Ignition power supply Output Ignition switch OFF or ACC 0 V
Ignition switch ON Battery voltage
72
(Y/R) Ground Cooling fan control Output Ignition switch
OFF 5 V
ACC 0 V
ON
2. 5 V
Engine running
Te r m i n a l N O .
(Wire color) Description
Condition Va l u e
(Approx.)
Signal name Input/
Output
+–
JMMIA0404GB
Control part Fail-safe operation
Cooling fan  Transmits the pulse duty signal (PWM signal) 100% when the ignition switch is turned ON.
 Transmits the pulse duty signal (PWM signal)
0% when the ignition switch is turned OFF.
A/C compressor A/C relay OFF
Alternator Transmits the power generation command signal (PWM signal) 0%
Control part Fail-safe 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 relay OFF
Parking lamp
 License plate lamp
 Illumination
 Tail lamp
 Side marker lamp  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 motor  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 con-
trol is activated while the front wiper is set in the INT mode and the front wiper motor is op-
erating.
 Return automatically wiper to stop position when ignition switch is turned ON if fail-safe con-
trol is activated while front wiper motor is operated and wiper stops in the other position than
stop position.
Front fog lamp Front fog lamp relay OFF
Horn Horn OFF
Revision: 2010 May2011 QX56

PCS-22
< ECU DIAGNOSIS INFORMATION >[IPDM E/R]
IPDM E/R
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 volt age differs between the contact circuit and the excitation
coil circuit.
 If the ignition relay cannot turn OFF due to contact seiz ure, 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.
FRONT WIPER PROTECTION FUNCTION
IPDM E/R detects front wiper stop positi on by a front wiper stop position signal.
When a front wiper stop position signal is in the conditi ons listed below, IPDM E/R stops power supply to wiper
after repeating a front wiper 10 seconds activation and 20 seconds stop.
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.
DTC IndexINFOID:0000000006220174
NOTE:
 The details of time display are as follows.
- CRNT: A malfunction is detected now.
- PAST: A malfunction was detected in the past.
 IGN counter is displayed on FFD (Freeze Frame data).
- The number is 0 when is detected now.
- The number increases like 1 → 2 ··· 38 → 39 after returning to the normal condition whenever IGN OFF →
ON.
- The number is fixed to 39 until the self-diagnosis results are erased if it is over 39.
× : Applicable
Ignition relay The status just before activation of fail-safe is maintained.
Starter motor Starter control relay OFF
Steering lock unit Steering lock relay OFF Control part Fail-safe operation
Voltage judgment
IPDM E/R judgment Operation
Ignition relay contact side Ignition relay excitation coil
side
ON ON Ignition re lay ON normal —
OFF OFF Ignition relay OFF normal —
ON OFF Ignition relay ON stuck  Detects DTC “B2098: IGN RELAY ON”
 Turns ON the tail lamp relay for 10 min-
utes
OFF ON Ignition relay OFF stuck Detects DTC “B2099: IGN RELAY OFF”
Ignition switch Front wiper switch Front wiper stop position signal
ON OFF
The front wiper stop position signal (stop position) cannot be input for
10 seconds.
ON The front wiper stop position signal does not change for 10 seconds.
CONSULT display Fail-safe Refer to
No DTC is detected.
further testing
may be required. ——
U1000: CAN COMM CIRCUIT ×PCS-28
B2098: IGN RELAY ON ×PCS-29
Revision: 2010 May2011 QX56

PCS
IPDM E/RPCS-23
< ECU DIAGNOSIS INFORMATION > [IPDM E/R]
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B2099: IGN RELAY OFF —
PCS-30
B209F: CRANK REQ CIR OPEN —SEC-123
B20A0: CRANK REQ CIR SHORT —SEC-125
B2108: S/L RELAY ON —SEC-127
B2109: S/L RELAY OFF —SEC-128
B210A: S/L STATE SW —SEC-129
B210B: PNP RLY ON —SEC-131
B210C: PNP RLY OFF —SEC-132
B210D: STARTER RELAY ON —SEC-133
B210E: STARTER RELAY OFF —SEC-134
B210F: INTRLCK/PNP SW ON —SEC-136
B2110: INTRLCK/PNP SW OFF —SEC-138
CONSULT display Fail-safe Refer to
Revision: 2010 May2011 QX56

PCS
B2098 IGNITION RELAY ON STUCKPCS-29
< DTC/CIRCUIT DIAGNOSIS > [IPDM E/R]
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B2098 IGNITION RELAY ON STUCK
DescriptionINFOID:0000000006220179
 IPDM E/R operates the ignition relay when it receives
an ignition switch ON signal from BCM via CAN com-
munication.
 Turn the ignition relay OFF by pressing the push-butt on ignition switch once when the vehicle speed is 4 km/
h (2.5 MPH) or less.
 Turn the ignition relay OFF with the following operat ion when the vehicle speed is more than 4 km/h (2.5
MPH) or when an abnormal condition occurs in CAN communication from the combination meter (Emer-
gency OFF)
- Press and hold the push-button ignition switch for 2 seconds or more.
- Press the push-button ignition switch 3 times within 1.5 seconds.
NOTE:
The ignition relay does not turn ON for 3 seconds af ter emergency OFF even if the push-button ignition switch
is pressed.
DTC LogicINFOID:0000000006220180
DTC DETECTION LOGIC
Diagnosis ProcedureINFOID:0000000006220181
1.PERFORM SELF DIAGNOSIS
1. Turn the ignition switch ON.
2. Erase “Self Diagnostic Result” of IPDM E/R.
3. Turn the ignition switch OFF, and wait for 1 second or more.
4. Turn the ignition switch ON. Check “Self Diagnostic Result” again.
Is DTC
“B2098” displayed?
YES >> Replace IPDM E/R. Refer to PCS-32, "Removal and Installation".
NO >> Refer to GI-40, "
Intermittent Incident".
DTCCONSULT-III dis-
play description DTC Detection Condit
ion Possible causes
B2098 IGN RELAY ON The ignition relay ON is detected for 1 second at ignition switch OFF
(CPU monitors the status at the contact and excitation coil circuits
of the ignition relay inside it) Ignition relay malfunction
Revision: 2010 May2011 QX56

PCS-30
< DTC/CIRCUIT DIAGNOSIS >[IPDM E/R]
B2099 IGNITION RELAY OFF STUCK
B2099 IGNITION RELAY OFF STUCK
DescriptionINFOID:0000000006220182
 IPDM E/R operates the ignition relay when it receives
an ignition switch ON signal from BCM via CAN com-
munication.
 Turn the ignition relay OFF by pressing the push-butt on ignition switch once when the vehicle speed is 4 km/
h (2.5 MPH) or less.
 Turn the ignition relay OFF with the following operati on when the vehicle speed is more than 4 km/h (2.5
MPH) or when an abnormal condition occurs in CAN communication from the combination meter (Emer-
gency OFF)
- Press and hold the push-button ignition switch for 2 seconds or more.
- Press the push-button ignition switch 3 times within 1.5 seconds.
NOTE:
The ignition relay does not turn ON for 3 seconds af ter emergency OFF even if the push-button ignition switch
is pressed.
DTC LogicINFOID:0000000006220183
DTC DETECTION LOGIC
NOTE:
When IPDM E/R power supply voltage is low (Approx. 7 - 8 V for about 1 second), the “DTC: B2099” may be detected.
Diagnosis ProcedureINFOID:0000000006220184
1.PERFORM SELF DIAGNOSIS
1. Turn the ignition switch ON.
2. Erase “Self Diagnostic Result”.
3. Turn the ignition switch OFF.
4. Turn the ignition switch ON. Check “Self Diagnostic Result” again.
Is DTC
“B2099” displayed?
YES >> Replace IPDM E/R. Refer to PCS-32, "Removal and Installation".
NO >> Refer to GI-40, "
Intermittent Incident".
DTCCONSULT-III dis-
play description DTC Detection Condit
ion Possible causes
B2099 IGN RELAY OFF The ignition relay OFF is detected for 1 second at ignition switch ON
(CPU monitors the status at the contact and excitation coil circuits of
the ignition relay inside it) Ignition relay malfunction
Revision: 2010 May2011 QX56

PCS-32
< REMOVAL AND INSTALLATION >[IPDM E/R]
IPDM E/R
REMOVAL AND INSTALLATION
IPDM E/R
Removal and InstallationINFOID:0000000006220186
CAUTION:
IPDM E/R integrated relays are not serviceable pa
rts, and must not be removed from the unit.
REMOVAL
1. Disconnect the battery cable from the negative terminal.
2. Remove the IPDM E/R cover A.
3. Remove the IPDM E/R (1) while pressing the pawls (A).
4. Disconnect the harness connector and then remove the IPDM E/R.
INSTALLATION
Install in the reverse order of removal.
JMMIA0331ZZ
Revision: 2010 May2011 QX56

PCS
COMPONENT PARTSPCS-35
< SYSTEM DESCRIPTION > [POWER DISTRIBUTION SYSTEM]
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SYSTEM DESCRIPTION
COMPONENT PARTS
Component Parts LocationINFOID:0000000006220189
Component DescriptionINFOID:0000000006220190
BCMINFOID:0000000006220191
BCM controls the various electrical components and
simultaneously supplies power according to the power
supply position.
BCM checks the power supply position internally.
Ignition RelayINFOID:0000000006220192
BCM turns ON the following relays to supply ignition power supply or ignition switch ON signal to each ECU
when the ignition switch is turned ON.
 Ignition relay-1
 Ignition relay (inside IPDM E/R)
 Blower relay
1. BCM
Refer to BCS-4, "
BODY CONTROL
SYSTEM : Component Parts Loca-
tion". 2. Push-button ignition switch 3. IPDM E/R
Refer to PCS-4, "
Component Parts
Location".
4. Stop lamp switch 5. TCM Refer to TM-10, "
A/T CONTROL
SYSTEM : Compon ent Parts Loca-
tion".
JMMIA0384ZZ
BCM Reference
BCM PCS-35
Ignition relay (Built-in IPDM E/R)
PCS-35
Ignition relay-1
Accessory relayPCS-36
Blower relayPCS-36
Push-button ignition switchPCS-36
Stop lamp switchSEC-10
TCM (Transmission range switch)SEC-10
Revision: 2010 May2011 QX56

PCS-36
< SYSTEM DESCRIPTION >[POWER DISTRIBUTION SYSTEM]
COMPONENT PARTS
BCM compares following status comparing.
 Ignition relay-1 control signal, and power supply position judged by BCM
 Ignition relay (inside IPDM E/R) control request, and Ignition relay (inside IPDM E/R) status
Accessory RelayINFOID:0000000006220193
BCM turns ON the accessory relays to supply accessory power supply or ignition switch ACC signal to each
ECU when the ignition switch is turned ACC or ON.
BCM compares status of accessory relay control signal, and power supply position judged by BCM.
Blower RelayINFOID:0000000006220194
BCM turns ON the following relays to supply ignition power supply or ignition switch ON signal to each ECU
when the ignition switch is turned ON.
 Ignition relay-1
 Ignition relay (inside IPDM E/R)
 Blower relay
BCM compares status of blower relay control signal, and power supply position judged by BCM.
Push-Button Ignition SwitchINFOID:0000000006220195
BCM transmits the change in the power supply position wit
h the push-button ignition switch to IPDM E/R via
CAN communication line. IPDM E/R transmits the power supply position status via CAN communication line to
BCM.
Revision: 2010 May2011 QX56