Integrated Power Module (IPM)

The Integrated Power Module (IPM) is an electrical control and interface center located in the engine compartment. The IPM houses in one module what is known in other vehicles as the Power Distribution Center and the Front Control Module. The IPM, with its fuses and relays provides power and signal distribution throughout most of the vehicle. The IPM receives both hard wire and digital electronic inputs from the vehicle electrical system. Based on these inputs and the ignition switch position, it provides direct power feeds and relay control to some of the vehicles' most critical electrical systems.

The Integrated Power Module provides the following features:

Controlled power feeds:
- Front airbag system
- Headlamp power
- Tail lamps and side marker lamps
- Front park lamps
- Front side marker lamps
- Front fog lamps
- License plate lamp
- Transmission control
- Autostick
- Brake transmission shift interlock (BTSI) system
- Front washer motor
- Rear washer motor

Relay controls:
- Front wiper on relay
- Front wiper high/low relay
- Accessory relay
- Horn relay
- Front blower relay
- Rear booster fan relay
- Electronic back light (EBL) relay
- Run only relay
- Door node relay

Electrical inputs:
- Brake sense
- Front wiper park
- Washer fluid input
- Horn switch
- Wiper park switch
- Brake fluid level switch
- Run start sense
- IOD/ Radio/ Clock sense
- PCI bus
- Flash reprogramming voltage
- Ignition start sense

CONTROLLED POWER FEEDS

Front airbag system
The IPM provides power to the Occupant Restraint Control (ORC) system through two "fuse-less" circuits (ORC RUN/START, and ORC RUN only). These circuits are electronically controlled and continuously monitored for malfunctions. Power is supplied while the ignition switch is in the RUN and START positions on pin 16 of the IPM connector C9, and in the RUN only position on pin 1 of the IPM C4 connector.

Headlamp power
The headlamp switch is a direct input to the BCM. The BCM sends a PCI Bus message to the IPM informing it of a headlamp switch status change. The IPM then turns on power to the headlamps through four "fuseless" circuits. These circuits are electronically controlled and continuously monitored for malfunctions. Power is supplied to each filament in a separate circuit. For vehicles equipped with Daytime Running Lamps (DRL), the IPM electronically steps down the headlamp voltage to provide the desired illumination.

Tail lamps and side marker lamps
When the IPM receives a message to turn on the rear tail lamps and the side marker lamps, the IPM will supply power to pin 15 of the C4 connector for the right tail lamp and the right side marker lamp and will provide power to pin 7 of the C9 connector for the left tail lamp and left side marker lamp.

Front park lamps
When the IPM receives a message for front park lamps on, the IPM will supply power to pin 26 of connector C5 for the right lamp and pin 24 of the C5 connector for the left lamp.

Front side marker lamps
When the IPM receives a message for front side marker lamps on, the IPM will supply power to pin 6 of the C5 connector for the right front side marker and pin 7 of the C5 connector for the left side marker lamp.

Front fog lamps
When the IPM receives a message for front fog lamps on, the IPM will supply power to pin 17 of the C5 connector for the right lamp and pin 2 of the C5 connector for the left lamp.

License plate lamp
When the IPM senses that the park lamps switch is closed, the IPM will supply power through a high side driver of the IPM.

Transmission Control
The electronic automatic 4 speed transmission control (which is internal to the PCM) is powered when the ignition switch is in the RUN or START position. This circuit is electronically controlled and continuously monitored for malfunctions.

Autostick power
The autostick is powered when the ignition switch is in the UNLOCK, RUN or START position. This circuit is electronically controlled and continuously monitored for malfunctions.

Brake transmission shift interlock (BTSI) system
The brake shift interlock solenoid receives power from a high side driver inside the IPM. The high side driver control is hardwired to pin 19 of the IPM C9 connector. The IPM energizes the BTSI when in Accessory, Start or Run positions thus preventing the shift lever from being moved from the Park position. The IPM will de-energize the BTSI solenoid when the brake pedal is applied or the shift lever is in any other position than Park.

Front washer motor
The front washer switch is a direct input to the BCM. The BCM sends a PCI Bus message to the IPM informing it of a request to wash. The front washer motor is then powered through high side control inside the IPM. This circuit is electronically controlled and continuously monitored for malfunctions. In addition, the IPM electronically protects the washer motor from system voltages higher than 16 volts by automatically switching off the high side circuit.

Rear washer motor
The rear washer switch is a direct input to the BCM. The BCM sends a PCI Bus message to the IPM informing it of a request to wash. The rear washer motor is then powered through low side control inside the IPM. This circuit is electronically controlled and continuously monitored for malfunctions. In addition, the FCM electronically protects the washer motor from system voltages higher than 16 volts by automatically switching off the high side circuit.

RELAY CONTROLS

Front wiper on relay
The front wiper switch is a direct input to the BCM. The BCM sends a PCI Bus message to the IPM informing it to turn on the front wiper on relay. This relay is electronically controlled and continuously monitored for malfunctions. The front wiper on relay is turned on internally by the IPM as soon as the IPM receives the message from the BCM.

Front wiper high/low relay
The front wiper switch is a direct input to the BCM. The BCM sends a PCI Bus message to the IPM informing it to turn on the front wiper high/ low relay. The relay switches power between the low speed and high speed windings of the wiper motor. The front wiper high/low relay is turned on internally by the IPM as soon as the IPM receives the message from the BCM. This circuit is electronically controlled and the coil side of the relay is monitored for malfunctions.

Accessory relay
The accessory relay works in conjunction with the IPM's power accessory delay feature to control the operation of the radio, amplifier, EVIC, power windows, washer motors, wiper motors, power sunroof, and power outlet. The accessory relay is turned on through low side control internal to the IPM as soon as the IPM receives information from the BCM that the ignition is in the ACCY or RUN position. This circuit is electronically controlled and continuously monitored for malfunctions. Depending on the ignition switch position, the accessory relay will remain on or will time-out and turn off. The accessory relay remains on in the RUN and ACCY positions of the ignition switch. In the OFF position, the relay will remain energized for 45 seconds then turn off. During this time-out period, if the driver or passenger doors are opened, the relay will turn off immediately. While the ignition switch is in the START position, the relay will also drop-out, then resume operation. Accessory relay operation is most noticeable by observing the operation of the radio.

Horn relay
The horn relay operates through a direct wire input to the IPM from the horn switch or a PCI Bus message from the BCM. The relay responds to the horn switch, remote door lock and VTSS alarm functions. The horn relay is powered through low side control internal to the IPM. Under normal operating conditions, if the horn is pressed for longer than 30 seconds, the IPM will automatically deactivate the horn to prevent damage to it. The IPM will re-activate control of the relay after a 25 second cool-down period. This circuit is electronically controlled and continuously monitors the coil side of the relay for malfunctions.

Front Blower & Rear Booster Fan relays Automatic Temperature Control (ATC)
The front blower and the rear booster fan are controlled by the Automatic Temperature Control (ATC). When powered up, the ATC sends a relay on request over the PCI Bus message to the IPM. The front blower and rear booster fan relays are then powered through low side controls internal to the IPM. This circuit is electronically controlled and continuously monitored for malfunctions.

Manual Temperature Control (MTC)
The blower is controlled by the A/C Heater Control. When powered up (power switch on), the A/C Heater Control broadcasts a relay on request on the PCI Bus to the Integrated Power Module (IPM). The front blower relay is then powered through low side control internal to the IPM. This circuit is electronically controlled and continuously monitored for malfunctions.

Electronic Back Light (EBL) relay
The rear defogger switch is part of the Automatic Temperature Control (ATC). When the ignition switch is in the RUN position and the rear defogger switch is turned on, the ATC sends a PCI Bus message to the IPM. The EBL relay is then powered through low side control internal to the IPM. The relay provides the power to the rear window defogger grid, and ground is attached to the vehicle body. The IPM will only allow the rear defogger to operate in the RUN position. This circuit is electronically controlled and continuously monitors the coil side of the relay for malfunctions.

Door Node Relay
The IPM energizes the door node relay when the ignition switch is in Accessory, Run Start or Run positions. The relay provides power to two 40 Amp fuses. One for the Driver Door Module and the other for the Passenger Door Module. When the ignition is turned off, the IPM will continue to energize the relay for 45 seconds or until one of the doors is opened.

Starter Relay
The starter relay in the IPM receives battery voltage through a hardwired input from the ignition switch. The starter relay ground is controlled by the PCM. When the relay is energized, the IPM will provide battery voltage to the starter solenoid through pin 5 of the C1 connector.

Run Relay
When the IPM receives information that the ignition switch is in the run position, it will energize the run only relay thus providing power to the rear heated seats, climate control and the ABS.

Fuel Pump Relay
The PCM will provide the ground to energize the coil of the fuel pump relay in the IPM when the ignition switch is in the run or run start positions. The IPM then provides power to the fuel pump.

ELECTRICAL INPUTS

Module battery supply - Battery input is on the nut and bolt connector of the IPM. This supplies battery voltage for all IPM operations.

Power ground - Ground source on pin 14 of connector C5 for all IPM operations.

Ignition switch RUN or START position status - 12 volt input on pin 13 of connector C9. Allows the IPM to determine the ignition switch status for related IPM operations.
Ignition switch START only status - 12 volt input on pin 4 of connector C4. And allows the IPM to discriminate between RUN/START input and START for related IPM operations.
PCI Bus - Approximately 7.5 volt input on pin 11of connector C4 and allows the IPM to communicate with other modules on the vehicle bus.
Brake sense status - The stop light switch sense tells the IPM to de-energize the BTSI when the ignition is in Run, Start or Accessory positions for brake shift interlock function.
Horn Switch - Horn signal input on pin 2 of connector C4. The signal tells the IPM to provide power to the horn.
Wiper park switch - Ground input on pin 3 of connector C4. Used to determine park placement of wipers. Also used as feedback to the IPM to determine correct operating mode of wipers.
Washer fluid level switch - Ground input to pull-up on pin 3 of connector C5. Ground is switched into the circuit when washer bottle fluid level is low.
Brake fluid level switch - Ground input to pull-up on pin 8 of connector C8. Ground is switched into the circuit when brake fluid level is low.
Battery IOD - The IPM enters a low power consumption mode when the ignition is turned OFF. This low current draw battery supply keeps the microprocessor functioning in the low power mode. The IOD fuse can be inserted two ways. The IGN designation on the face of the IPM is the SHIPPING position. The B+ designation on the face of the IPM is the NORMAL RUN position. If the ignition switch is off and the fuse is in the SHIPPING position, there will be no RKE or door lock functions.
Flash programming voltage - When a DRBIII(R) is connected and the proper flash reprogramming sequence is selected, the 20 volt signal will be applied through pin 5 of connector C9.

CAUTION: The IPM will learn several Learned Features when it is connected to a vehicle, therefore it is not recommended that IPM's be swapped from one vehicle to another or false DTC's could be stored in the module and could not be erased.