Power Lumbar Circuit Description AL2

Battery positive voltage (B+) is supplied at all times to each lumbar switch from the rear fuse block PWR SEAT Circuit Breaker.

When the lumbar switch is operated to move the lumbar back, battery positive voltage (B+) is applied via the lumbar backward switch contacts and the lumbar backward control circuit to the lumbar horizontal motor. The motor is grounded via the lumbar forward switch contacts and the forward control circuit to the motor. The motor runs to drive the lumbar back away from the occupant's back until the switch is released. Moving the lumbar forward works similarly to moving the lumbar back, except that battery positive voltage (B+) and ground are applied on the opposite circuits causing the motor to run in the opposite direction. This action drives the lumbar forward toward the occupant's back.

When the lumbar switch is operated to move the lumbar up, battery positive voltage (B+) is applied via the lumbar up switch contacts and the lumbar up control circuit to the lumbar vertical motor. The motor is grounded via the lumbar down switch contacts and the lumbar down control circuit to the motor. The motor runs to drive the lumbar up until the switch is released. Moving the lumbar down works similarly to moving the lumbar up, except that battery positive voltage (B+) and ground are applied on the opposite circuits causing the motor to run in the opposite direction.

Power Lumbar Circuit Description AC9

Battery positive voltage (B+) is supplied at all times to driver and passenger adaptive lumbar modules from the rear fuse block MEM T&T Fuse. With the ignition in the ON position, battery positive voltage (B+) is also supplied to both adaptive lumbar modules via the ignition 3 circuit and the rear fuse block IGN 3 Fuse. With the ignition in the ON position, battery positive voltage (B+) is supplied to each lumbar switch via the power switch circuit and the appropriate adaptive lumbar module.

When the lumbar switch is operated to move the lumbar forward, battery positive voltage (B+) is applied via the lumbar forward switch contacts and the lumbar forward input circuit to the adaptive lumbar module. In response to this input, the adaptive lumbar module supplies a pulse width modulated signal via the adaptive pump control circuit and ground via the pump ground circuit to the lumbar pump motor. The lumbar pump motor runs to supply air to the lumbar bladder in the seat back. Adding air to the bladder increases the support. When the lumbar switch is operated to move the lumbar back, battery positive voltage (B+) is applied via the lumbar back switch contacts and the lumbar back input circuit to the adaptive lumbar module. In response to this input, the adaptive lumbar module releases air from the lumbar support bladder. Releasing air from the bladder decreases the support. The adaptive seat may be manually adjusted at anytime the ignition switch is in the ON position.

When the lumbar switch is moved up in the AUTO/ON position, battery positive voltage (B+) is applied via the AUTO/ON switch contacts and the auto input circuit to the adaptive lumbar module. In response to this input, the adaptive lumbar module will automatically adjust the support to the occupant by supplying a pulse width modulated signal to the lumbar pump motor via the adaptive pump control circuit and ground via the pump ground circuit, to add air into the bladder or release air from the bladder. When the lumbar switch is moved down in the OFF position, battery positive voltage (B+) is applied via the OFF switch contacts and the off input circuit to the adaptive lumbar module. In response to this input, the adaptive lumbar module will release all air from the bladders.

Power Lumbar Circuit Description A45

Battery positive voltage (B+) is supplied at all times to the lumbar switch from the rear fuse block MEM T&T Fuse.

When the lumbar switch is operated to move the lumbar back, battery positive voltage (B+) is applied via the lumbar backward switch contacts and the lumbar backward circuit to the memory seat module (MSM). In response to this input, the MSM supplies battery positive voltage (B+) via the lumbar backward control circuit and ground via the lumbar forward control circuit to the lumbar horizontal motor. The motor runs to drive the lumbar back, away from the driver's back until the switch is released. When the lumbar switch is operated to move the lumbar forward, battery positive voltage (B+) is applied via the lumbar forward switch contacts and the lumbar forward circuit to the MSM. In response to this input, the MSM supplies battery positive voltage (B+) via the lumbar forward control circuit and ground via the lumbar backward control circuit to the lumbar horizontal motor. The motor runs to drive the lumbar forward toward the driver's back until the switch is released. The MSM also controls the lumbar horizontal motor during memory recall functions.

When the lumbar switch is operated to move the lumbar up, battery positive voltage (B+) is applied via the lumbar up switch contacts and the lumbar up circuit to the memory seat module (MSM). In response to this input, the MSM supplies battery positive voltage (B+) via the lumbar up control circuit and ground via the lumbar down control circuit to the lumbar vertical motor. The motor runs in order to drive the lumbar up until the switch is released. When the lumbar switch is operated in order to move the lumbar down, battery positive voltage (B+) is applied via the lumbar down switch contacts and the lumbar down circuit to the MSM. In response to this input, the MSM supplies battery positive voltage (B+) via the lumbar down control circuit and ground via the lumbar up control circuit to the lumbar vertical motor. The motor runs to drive the lumbar down until the switch is released. The MSM also controls the lumbar vertical motor during memory recall functions.

The memory seat module (MSM) supplies a 5 volt reference voltage via the 5 volt reference circuit and ground via the sensor ground circuit to the respective lumbar position sensors. The MSM receives a feedback voltage signal from the sensors via the lumbar vertical and horizontal sensor signal circuits.