Power Window System: Operation

Left Front Door Module (LFDM) directly controls drivers door lock actuator, power window motor and outside mirror. LFDM sends and receives messages from Left Front Power Window Switch (LFPWS) assembly to RFDM, RRDM and LRDM modules over SBI line. LFDM also sends and receives messages from other vehicle system modules over class 2 data line. LFDM will enter wake-up state if any of the following wake-up inputs are detected:

• Any activity on serial data line.
• Hatch ajar switch.
• Door ajar switch.
• Key-in-ignition switch.
• Monitored load relay.
• LFDM experiences a battery disconnect/reconnect condition.
• Ignition turned on.

LFDM will enter sleep state when all of the following conditions exist:

• No serial data line activity exists.
• Ignition switch off.
• No output commands detected.
• No delay timers actively counting.
• No wake-up inputs present.

If all conditions are met, LFDM enters low power or sleep condition, indicating LFDM must have sent message to other systems on serial data line to stop broadcasting State Of Health (SOH) messages.

Right Front Door Module (RFDM) controls right front door lock actuator, power window motor and power mirror. RFDM receives direct inputs from right front door lock switch, right front power window switch and right front door jamb switch. RFDM sends and receives messages from LFDM, LRDM and RRDM over SBI line.

Left Rear Door Module controls left rear door lock actuator and power window motor. LRDM receives direct inputs from left rear door lock switch, left rear power window switch and left rear door jamb switch. LRDM sends and receives messages from LFDM, RFDM and RRDM over SBI line.

Right Rear Door Module controls right rear door lock actuator and power window motor. RRDM receives direct inputs from right rear door lock switch, right rear power window switch and right rear door jamb switch. RRDM sends and receives messages from LFDM, RFDM and LRDM over SBI line.

Left Front Power Window Switch (LFPWS) assembly provides messages for controlling power door locks, power windows and power mirrors to LFDM over SBI line. LFPWS assembly contains a microprocessor which receives direct inputs from door modules and reports to all switch activity to LFDM.

Each door module is capable of performing window up/down movement, door ajar status, door lock/unlock functions, front door outside mirror controls and door switch lamp dimming.