Circuit/System Description
WARNING: This page is about a different car, the 2018 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
| Circuit | Description |
|---|---|
| Ignition | Supplied from a fuse. |
| Signal | The control module input circuit has an internal resistance connected to 12 V. |
| Ground | Chassis Ground |
| Component | Description |
|---|---|
| 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. |
| K9 Body Control Module | The control module contains a microprocessor used to process input data to control outputs. |
| S2 Transmission Manual Shift Switch | The switch S2 has an internal resistor ladder network. A specific resistance is generated dependent on the position of the switch.The switches are connected in series between the ground and the signal circuit and are inputs to the control module K9. When a switch is pressed, the voltage drop across the switch changes. The driver shift request is sent over serial data to the control module K71. The control module K71 ignores a shift request if the transmission shift lever is not in the manual mode position, or the operating conditions are out of range. |
| S3 Transmission Shift Lever | The switches are connected in series between the ground and the signal circuit and are inputs to the control module K9. When a switch is pressed, the voltage drop across the switch changes. The driver shift request is sent over serial data to the control module K71. The control module K71 ignores a shift request if the transmission shift lever is not in the manual mode position, or the operating conditions are out of range.The switch S2 has an internal resistor ladder network. A specific resistance is generated dependent on the position of the switch. |
The control module K9 monitors for a driver up or down shift request. The up/down button on the S2 is hard wired to the control module K71. The driver shift request is sent over serial data to the control module K9. The control module K71 ignores a manual shift if the operating conditions are out of range.