Circuit/System Description
WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. 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 |
|---|---|
| Signal | The control module input circuit has an internal resistance connected to 12 V. |
| Low Reference | Grounded through the control module. |
| Component | Description |
|---|---|
| B15 Transmission Internal Mode Switch | The assembly contains 5 individual switches. |
| K20 Engine Control Module | The control module controls a series of actuators to ensure optimal engine performance. The control module does this by reading values from a variety of sensors, interprets the data and adjusts the engine actuators accordingly. |
| K71 Transmission Control Module | 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. |
The control module K71 uses 4 of the switches as inputs to determine the gear selector lever position. The control module K20 uses 1 of the switches as an input to determine when the transmission is in park or neutral for engine starting.