Infiniti M35/M45 Y50. Manual — part 970

IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)

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Concept of Auto Active Test

●

IPDM E/R actuates auto active test mode when it receives door switch signal from BCM via CAN commu-
nication line. Therefore, when auto active test mode is activated successfully, CAN communication
between IPDM E/R and BCM is normal.

●

If any of systems controlled by IPDM E/R cannot be operated, possible cause can be easily diagnosed
using auto active test.

Diagnosis chart in auto active test mode

PKIC0274E

Symptom

Inspection contents

Possible cause

Any of front wipers,
tail lamps, parking
lamps, front fog
lamps, and head
lamps (HI, LO) do not
operate.

Perform auto active
test. Does system
in question oper-
ate?

YES

●

BCM signal input system malfunction

NO

●

Lamp/wiper motor malfunction

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Lamp/wiper motor ground circuit malfunction

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Harness/connector malfunction between IPDM E/R and system in question

●

IPDM E/R (integrated relay) malfunction

Rear window defog-
ger does not operate.

Perform auto active
test. Does rear win-
dow defogger oper-
ate?

YES

●

BCM signal input circuit malfunction

NO

●

Rear window defogger relay malfunction

●

Harness/connector malfunction between IPDM E/R and rear window defogger
relay

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Open circuit of rear window defogger

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IPDM E/R malfunction

A/C compressor does
not operate.

Perform auto active
test. Does magnetic
clutch operate?

YES

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BCM signal input circuit malfunction

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CAN communication signal malfunction between BCM and ECM.

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CAN communication signal malfunction between ECM and IPDM E/R

NO

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Magnetic clutch malfunction

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Harness/connector malfunction between IPDM E/R and magnetic clutch

●

IPDM E/R (integrated relay) malfunction

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IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)

Cooling fan does not
operate.

Perform auto active
test. Does cooling
fan operate?

YES

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ECM signal input circuit malfunction

●

CAN communication signal malfunction between ECM and IPDM E/R

NO

●

Cooling fan motor malfunction

●

Harness/connector malfunction between cooling fan motor and cooling fan
control module

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Cooling fan control module malfunction

●

Harness/connector malfunction between IPDM E/R and cooling fan control
module

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Cooling fan relay malfunction

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Harness/connector malfunction between IPDM E/R and cooling fan relay

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IPDM E/R malfunction

Oil pressure warning
lamp does not oper-
ate.

Perform auto active
test. Does oil pres-
sure warning lamp
blink?

YES

●

Harness/connector malfunction between IPDM E/R and oil pressure switch

●

Oil pressure switch malfunction

●

IPDM E/R malfunction

NO

●

CAN communication signal malfunction between IPDM E/R and unified meter
and A/C amp.

●

Combination meter malfunction

Symptom

Inspection contents

Possible cause

IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)

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Schematic

NKS004E8

TKWT5166E

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IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)

IPDM E/R Terminal Arrangement

NKS004E9

CKIT0665E