SRX AWD V8-4.6L VIN A (2004)
Each load management function, either idle boost or load-shed, is discrete. No two functions are implemented at the same time.
During each load management function, the PMM checks the battery temperature, battery voltage and amp-hour calculations and determines if the
PMM should implement a different power management function.
Idle Boost Functions
The PMM sends a serial data request to the ECM to increase the idle speed. The ECM then adjusts the idle speed by using a special program and idle
speed ramp calculations in order to prevent driveability and safety concerns. The idle speed boost and cancel function will vary from vehicle to
vehicle and from one moment to another on the same vehicle. This happens because the ECM responds to changes in the inputs from the sensors used
to control the powertrain.
Load Shed Function
The PMM executes the load shed function, by controlling the relay coil of the following devices.
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The A/C clutch
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The heated mirrors
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The heated seats
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The rear defog
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The HVAC blowers
DIM Wake-up/Sleep States
The DIM is able to control or perform all of the DIM functions in the wake-up state. The DIM enters the sleep state when active control or monitoring
of system functions has stopped, and the DIM has become idle again. The DIM must detect certain wake-up inputs before entering the wake-up state.
The DIM monitors for these inputs during the sleep state, where the DIM is able to detect switch transitions that cause the DIM to wake-up when
activated or deactivated. Multiple switch inputs are needed in order to sense both the insertion of the ignition key and the power mode requested. This
would allow the DIM to enter a sleep state when the key is IN or OUT of the ignition.
The DIM will enter a wake-up state if any of the following wake-up inputs are detected:
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Activity on the serial data line.
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Detection of a battery disconnect and reconnect condition.
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Door ajar switch.
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Headlamps are on.
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Hood ajar switch.
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Ignition is turned ON.
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Key-in-ignition switch.
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Parklamps are on.
The DIM will enter a sleep state when all of the following conditions exist:
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Ignition switch is OFF.
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No activity exists on the class 2 serial data line.
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No outputs are commanded.
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No delay timers are actively counting.
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No wake-up inputs are present.
If all these conditions are met the DIM will enter a low power or sleep condition. This condition indicates that the DIM, which is the PMM of the
vehicle, has sent an OFF-ASLEEP message to the other systems on the serial data line.
REAR INTEGRATION MODULE (RIM)
The various RIM inputs and outputs are described in the corresponding functional areas as indicated on the RIM electrical schematics.
The RIM functions include the following:
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BTSI solenoid control
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class 2 communication requiring RIM interaction
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content theft deterrent
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fuel door control
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fuel level sensor input
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heated seat control
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intrusion sensor control
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key in ignition chime control
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performance shift control
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position lamp control
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park brake relay control
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rear defog relay control
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rear foglamp relay control
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rear park assist chime control
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retained accessory power (RAP) relay control
