Grand Cherokee 2WD L6-4.0L VIN S (1997)
Seat Memory Switch: Description and Operation
CIRCUIT OPERATION
The memory switch is used for programming the desired seat positions into the MSM memory. The memory switch also programs power mirror
position into the Drivers Door Module (DDM) and the Passengers Door Module (PDM), and presets radio station selections.
Circuit P22 from DDM supplies power to the three sets of switches in the memory switch; set, memory 1, and memory 2. The three switch sets are
wired in parallel and each contains a separate resistor. The voltage level present on circuit P22 depends on which memory switch is activated.
Circuit Z1 from the DDM provides ground for the switches.
After a memory switch activates, the DDM broadcasts the appropriate signal on CCD bus. The MSM adjusts seat position in response to the
signal.
Circuit M1 from the DDM powers the green Light Emitting Diodes (LED) in the set switch. Circuit G49 powers the red LED in the set switch.
Circuit Z1 provides ground for the LEDs.
