Transmission Control Module Power Supply

Battery Voltage (+30 Circuit)
The transmission control module is continuously supplied with battery voltage (+30 circuit) on pin 18. The control module uses this voltage as a backup for the memory. Current consumption on backup is less than 1 mA.

Battery Voltage (+15 Circuit)
When the ignition switch is in the Drive position, the transmission control module is supplied with current (+15 circuit) on pin 17. This current is necessary in order to activate the control module.