Infiniti QX56 (Z62). Manual - part 962

 

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Infiniti QX56 (Z62). Manual - part 962

 

 

PCS-4

< SYSTEM DESCRIPTION >

[IPDM E/R]

COMPONENT PARTS

SYSTEM DESCRIPTION

COMPONENT PARTS

Component Parts Location

INFOID:0000000006220160

1.

IPDM E/R

A.

Engine room (RH)

JMMIA0330ZZ

PCS

SYSTEM

PCS-5

< SYSTEM DESCRIPTION >

[IPDM E/R]

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SYSTEM

RELAY CONTROL SYSTEM

RELAY CONTROL SYSTEM : System Diagram

INFOID:0000000006220161

RELAY CONTROL SYSTEM : System Description

INFOID:0000000006220162

IPDM E/R activates the internal control circuit to perform the relay ON-OFF control according to the input sig-
nals from various sensors and the request signals received from control units via CAN communication.

CAUTION:

IPDM E/R integrated relays cannot be removed.

JMMIA0453GB

PCS-6

< SYSTEM DESCRIPTION >

[IPDM E/R]

SYSTEM

NOTE:

BCM controls the starter relay.

RELAY CONTROL SYSTEM : Fail-Safe

INFOID:0000000006220163

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

Control relay

Input/output

Transmit unit

Control part

Reference page

• Headlamp low relay
• Headlamp high relay

• Low beam request signal
• High beam request signal

BCM (CAN)

• Headlamp (LO)
• Headlamp (HI)

EXL-10

Front fog lamp relay

Front fog light request signal

BCM (CAN)

Front fog lamp

EXL-20

Tail lamp relay

Position light request signal

BCM (CAN)

• Parking lamp
• License plate 

lamp

• Tail  lamp
• Side marker lamp

EXL-18

Illuminations

INL-6

• Front wiper relay
• Front wiper high relay

Front wiper request signal

BCM (CAN)

Front wiper motor

WW-7

Front wiper stop position sig-
nal

Front wiper motor

Rear window defogger 
relay

Rear window defogger control 
signal

BCM (CAN)

Rear window defog-
ger

 

DEF-6

• Horn  relay
• Theft warning horn 

relay

• Theft warning horn request 

signal

• Horn reminder signal

BCM (CAN)

Horn (high)
Horn (low)

SEC-17

• Starter relay

NOTE

• Starter control relay

Starter control relay signal

BCM (CAN)

Starter motor

SEC-10

,

SEC-10

Steering lock unit condition 
signal

Steering lock unit

Starter relay control signal

TCM

Steering lock relay

Steering lock relay signal

BCM (CAN)

Steering lock unit

SEC-10

Steering lock unit condition 
signal

Steering lock unit

A/T shift selector (detention 
switch) signal

A/T shift selector 
(detention switch)

A/C relay

A/C compressor request sig-
nal

ECM (CAN)

A/C compressor
(Magnet clutch)

HAC-17

Headlamp washer relay

Headlamp washer request 
signal

BCM (CAN)

Headlamp washer 
pump

WW-13

• Ignition relay
• Ignition relay-2
• Ignition relay-3

Ignition switch ON signal

BCM (CAN)

Each control unit, 
sensor, actuator and 
relay (ignition power 
supply)

PCS-29

Vehicle speed signal

Combination meter 
(CAN)

Push-button ignition switch 
signal

Push-button ignition 
switch

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%

PCS

SYSTEM

PCS-7

< SYSTEM DESCRIPTION >

[IPDM E/R]

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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.

FRONT WIPER PROTECTION FUNCTION

IPDM E/R detects front wiper stop position by a front wiper stop position signal.
When a front wiper stop position signal is in the conditions 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.

POWER CONTROL SYSTEM

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

• 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

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

Voltage judgment

IPDM E/R judgment

Operation

Ignition relay contact side

Ignition relay excitation coil 

side

ON

ON

Ignition relay 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.

 

 

 

 

 

 

 

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