TL FWD V6-3.5L (2009)
Self-diagnostic Function (On-board diagnosis)
By connecting the HDS to the data link connector (DLC), the HDS can retrieve the diagnostic information from the driver's MICU via a diagnostic line
called the K-LINE. The K-LINE is separate communication line from the CAN lines, but it is connected to most of the CAN related ECUs. The driver's
MICU is a gateway between the HDS and B-CAN related ECUs, and sends B-CAN diagnostic information to the HDS. When doing a function test with
the HDS, the HDS sends an output signal through the K-LINE to the driver's MICU. The driver's MICU either relays the request to another ECU, or
commands the function its self.
Wake-up and Sleep Function
The multiplex integrated control system has wake-up and sleep functions to decrease parasitic draw on the battery when the ignition switch is to LOCK
(0), or the vehicle ignition in the OFF mode.
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In the sleep mode, the multiplex integrated control system stops functioning (communication and CPU control) when it is not necessary for the
system to operate.
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As soon as any operation is requested (for example, a door is unlocked), the related control units in the sleep mode immediately wake up and begin
to function.
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When the ignition switch is turned to LOCK (0), or the engine start/stop button is pressed to select the OFF mode, and the driver's door is opened,
then closed, there is a delay about 40 seconds before the control unit goes from the wake-up mode to the sleep mode.
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The sleep mode will not function if any door is opened or if a key is in the ignition.
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The draw is reduced from 200 mA to less than 35 mA when in the sleep mode.
NOTE: Sleep and Wake-up Mode Test. See: Testing and Inspection/Component Tests and General Diagnostics/Multiplex Integrated Control System
Sleep and Wake-Up Mode Test
