Circuit/System Description

WARNING: This page is about a different car, the 2020 Buick Regal and 2019 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.

For an overview of the component/system, refer to: Electronic Component Description

Circuit	Description
9 V Reference	The control module input circuit has an internal resistance connected to 9 V.
Signal	Grounded through the control module.

Component	Description
B14C Transmission Input Shaft Speed Sensor	The sensor contains a hall-effect sensor and additional electronics that processes the signal. It detects the change of strength of the magnetic field caused by the reluctor ring. When the strength changes, the sensor changes the amount of current it consumes. This results in a square wave signal of the current, while the voltage stays constant. The control module detects the frequency in which the current changes, which is proportional to the rotational speed.
K71 Transmission Control Module	The control module contains a microprocessor used to process input data to control outputs. The control module receives information from a variety of sensors, switches and serial data information from other control modules. This information is used to control a combination of solenoid valves to obtain the correct line pressure, gear ratio and torque converter clutch operation.
Reluctor Ring	The reluctor ring has 60 teeth, magnetic segments, or indentations. The reluctor ring is part of the component: 5-7-R and 6-7-8-9 clutch sub assembly. The clutch sub assembly is splined to the input shaft.

The sensor is an input to the control module K71. The input signal is used to determine the rotational speed of the component: Input Shaft