CTS-V V8-6.0L VIN U (2006)
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 dash integration module (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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Park lamps 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 power mode
master (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 rear integration module (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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The BTSI solenoid control
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The class 2 communication requiring RIM interaction
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The content theft deterrent
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The fuel door control
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The fuel level sensor input
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The heated seat control
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The intrusion sensor control
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The key in ignition chime control
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The performance shift control
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The position lamp control
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The park brake relay control
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The rear defog relay control
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The rear fog lamp relay control
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The rear park assist chime control
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The retained accessory power (RAP) relay control
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The reverse lamp relay control
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The reverse switch input w/manual transmission
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The sunroof speed control
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The traction mode switch input
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The transmission shift inhibit
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The trunk ajar input
