FX45 AWD V8-4.5L (VK45DE) (2006)
Power Distribution Module: Description and Operation
IPDM E/R (INTELLIGENT POWER DISTRIBUTION MODULE ENGINE ROOM)
System Description
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IPDM E/R (Intelligent Power Distribution Module Engine Room) integrates the relay box and fuse block which were originally placed in engine
compartment. It controls integrated relay via IPDM E/R control circuit.
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IPDM E/R-integrated control circuit performs ON-OFF operation of relay, CAN communication control, oil pressure switch signal, and hood
switch signal reception, etc.
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It controls operation of each electrical part via ECM, BCM and CAN communication lines.
CAUTION: None of the IPDM E/R-integrated relays can be removed.
SYSTEMS CONTROLLED BY IPDM E/R
1. Lamp control
Using CAN communication line, it receives signal from BCM and controls the following lamps:
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Headlamps (Hi, Lo)
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Parking, license plate, side marker and tail lamps
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Front fog lamps
2. Wiper control
Using CAN communication line, it receives signals from BCM and controls the front wipers.
3. Rear window defogger relay control
Using CAN communication line, it receives signals from BCM and controls the rear window defogger relay.
4. A/C compressor control
Using CAN communication line, it receives signals from ECM and controls the A/C compressor.
5. Cooling fan control
Using CAN communication line, it receives signals from ECM and controls cooling fan.
6. Horn control
Using CAN communication line, it receives signals from BCM and controls horn relay.
CAN COMMUNICATION LINE CONTROL
With CAN communication, by connecting each control unit using two communication lines (CAN L line, CAN H line), it is possible to transmit
maximum amount of information with minimum wiring. Each control unit can transmit and receive data, and reads necessary information only.
Fail- Safe Control
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When CAN communication with other control units is impossible, IPDM E/R performs fail-safe control. After CAN communication recovers
normally, it also returns to normal control.
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Operation of control parts by IPDM E/R during fail-safe mode is as follows:
IPDM E/R STATUS CONTROL
In order to save power, IPDM E/R switches status by itself based on each operating condition.
1. CAN communication status
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CAN communication is normally performed with other control units.