Unified meter NISSAN TEANA 2003 Service Manual

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
Symptom Inspection contents Possible cause
Any of front wiper, park-
ing, license plate and
tail lamps, front fog
lamp, and headlamp
(HI, LO) do not operate.Perform auto active
test. Does system in
question operate?YES

BCM signal input system malfunction
NO

Lamp/wiper motor malfunction

Lamp/wiper motor ground circuit malfunction

Harness/connector malfunction between IPDM E/R and system in ques-
tion

IPDM E/R (integrated relay) malfunction
Rear window defogger
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

Open circuit of rear window defogger

IPDM E/R malfunction
A/C compressor does
not operate.Perform auto active
test. Does magnetic
clutch operate?YES

BCM signal input circuit malfunction

CAN communication signal between BCM and ECM.

CAN communication signal between ECM and IPDM E/R
NO

Magnetic clutch malfunction

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

IPDM E/R (integrated relay) malfunction
Cooling fan does not
operate.Perform auto active
test. Does cooling fan
operate?YES

ECM signal input circuit

CAN communication signal between ECM and IPDM E/R
NO

Cooling fan motor malfunction

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

IPDM E/R (integrated relay) malfunction
Oil pressure warning
lamp does not operate.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 between BCM and Unified Meter and A/C
Amp.

Combination meter