Power, Ground, and Class 2
The IPC receives battery positive voltage from the underhood fuse block
IP fuse circuit. The IPC receives ignition voltage from the rear fuse block
IGN 1 fuse circuit. The IPC has 2 ground inputs that come
from the same vehicle ground circuit.
The IPC receives all class 2 serial data messages, via the class 2
serial data line.
The dash integration module (DIM) is responsible for determining the
power mode for the electrical system. The IPC does not sense ignition voltage
unless the there is a loss of communication with the DIM. The DIM broadcasts
the power via class 2 serial data message. The power modes are the
following:
| • | OFF - Asleep -- The IPC disables all displays. |
| • | OFF - Awake -- The SECURITY, LAMPS ON, and High Beam indicators
are available to be activated if conditions are correct. The IPC disables
all other displays. |
| • | UNLOCK -- The PRNDL display, the SECURITY, LAMPS ON, High
Beam, and BRAKE indicators are available to be activated if conditions are
correct. The IPC disables all other displays. |
| • | Accessory (ACC) -- The PRNDL display, the SECURITY, LAMPS
ON, High Beam, BRAKE indicators, and all PHONE DIC messages are available
to be activated if conditions are correct. The IPC disables all other displays. |
| • | RUN -- All gauges, indicators, and displays are available
to be activated if conditions are correct. |
| • | START -- The IPC disables all displays. |
| • | Retained Accessory Power (RAP) -- The SECURITY, LAMPS ON,
High Beam indicators, and all PHONE DIC messages are available to be activated
if conditions are correct. The IPC disables all other displays. |
| • | RAP - UNLOCK -- The PRNDL display, the SECURITY, LAMPS ON,
High Beam, BRAKE indicators, and all PHONE DIC messages are available to be
activated if conditions are correct. The IPC disables all other displays. |
If the power mode is unknown due to a loss of communication with the
DIM, the instrument cluster will enter power mode RUN when the ignition voltage
circuit is active. If the ignition voltage circuit is inactive, the instrument
cluster will enter power mode OFF - Awake.
Instrument Cluster Inputs
The instrument cluster receives direct inputs for the operation of various
gauges, indicators, and displays. The signals are the following:
| • | Service engine soon indicator signal |
| • | Brake fluid level signal |
| • | Windshield washer fluid level signal |
DIC Switches
The DIC switches are wired directly to instrument cluster. Each switch
is normally open. Activating the switch closes the contacts completing a ground
circuit and supplying a signal to the instrument cluster. The IPC will take
appropriate actions when a DIC switch is pressed.
If any switch is active for 20 seconds, the IPC will ignore the
signal and consider the input to be inactive until the switch signal is detected
to be inactive. An ignored switch will not have effect on the operation
of the other DIC switches.
High Voltage Supply
The instrument cluster provides a 54 volt supply to the instrument
panel integration module (IPM). The supply circuit is used to power the HVAC
vacuum fluorescent (VF) display.
