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Infiniti QX56 (Z62). Manual - part 966

PCS-20

< ECU DIAGNOSIS INFORMATION >

[IPDM E/R]

IPDM E/R

(LG/B)

Ground

Headlamp HI (LH)

Output

Lighting
switch 2ND or
AUTO (Light
is illuminated)

Lighting switch other than
H and PASS

0 V

• Lighting switch HI
• Lighting switch PASS

Battery voltage

(BR/Y)

Ground

Headlamp LO (LH)

Output

Lighting switch OFF

0 V

Lighting switch 2ND or AUTO (light is illu-
minated)

Battery voltage

(W)

Ground

Headlamp LO (RH)

Output

Lighting switch OFF

0 V

Lighting switch 2ND or AUTO (light is illu-
minated)

Battery voltage

(SB)

Ground

ECM power supply

Output

Approximately 1 second or more than after
turning the ignition switch ON

0 V

• Approximately 1 second after turning

the ignition switch ON

• Engine running

Battery voltage

(O)

Ground

Throttle control motor
relay power supply

Output

Ignition switch OFF
(More than a few seconds after turning ig-
nition switch OFF)

0 V

• Ignition switch ON
• Ignition switch OFF

(For a few seconds after turning ignition
switch OFF)

Battery voltage

(L)

Ground

A/C compressor power
supply

Output

Engine run-
ning

A/C switch OFF

0 V

A/C switch ON
(A/C compressor is oper-
ating)

Battery voltage

(V)

Ground

Ignition relay power
supply

Output

Ignition switch OFF or ACC

0 V

Ignition switch ON

Battery voltage

(BR/R)

Ground

Ignition relay power
supply

Output

Ignition switch OFF or ACC

0 V

Ignition switch ON

Battery voltage

(W/B)

Ground

Ignition relay power
supply

Output

Ignition switch OFF or ACC

0 V

Ignition switch ON

Battery voltage

(V/R)

Ground

Throttle control motor
relay control

Output

Ignition switch ON

→

OFF

0 - 1.0 V

↓

Battery voltage

↓

0 V

Ignition switch ON

0 - 1.0 V

(W)

Ground

Ignition relay power
supply

Output

Ignition switch OFF or ACC

0 V

Ignition switch ON

Battery voltage

(SB)

Ground

Ignition relay power
supply

Output

Ignition switch OFF or ACC

0 V

Ignition switch ON

Battery voltage

(P)

Ground

Steering lock unit con-
dition-2

Input

Steering lock is unlocked

0 V

Steering lock is locked

12 V

(G/Y)

Ground

A/T shift selector
(detention switch)

Input

Ignition switch
ON

Select lever P

0 V

Select lever in any posi-
tion other than P

12 V

(L)

Ground

Steering lock unit con-
dition-1

Input

Steering lock is unlocked

12 V

Steering lock is locked

0 V

Terminal NO.

(Wire color)

Description

Condition

Value

(Approx.)

Signal name

Input/

Output

–

PCS

IPDM E/R

PCS-21

< ECU DIAGNOSIS INFORMATION >

[IPDM E/R]

Fail-Safe

INFOID: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

(SB)

Ground

Push-button ignition
switch

Input

Press the push-button ignition switch

0 V

Release the push-button ignition switch

12 V

(O)

Ground

Ignition relay monitor

Input

Ignition switch OFF or ACC

12 V

Ignition switch ON

0 V

(W/B)

Ground

Ignition power supply

Output

Ignition switch OFF or ACC

0 V

Ignition switch ON

Battery voltage

(Y/R)

Ground

Cooling fan control

Output

Ignition switch

OFF

5 V

ACC

0 V

2. 5 V

Engine running

Terminal NO.

(Wire color)

Description

Condition

Value

(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

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 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.

DTC Index

INFOID: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