Serial Data Power Mode: Notes
WARNING: This page is about a different car, the 2004 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
On vehicles that have several control modules connected by serial data circuits, one module is the power mode master (PMM). On this vehicle the PMM is the DIM. The PMM receives 2 signals from the ignition switch.
To determine the correct power mode the PMM uses the following circuits:
- Accessory voltage
- Run/Crank voltage
2-Wire Ignition Switch Table
| Ignition Switch Position | Accessory (Ignition Accessory/Run) | IGN 1 (Ignition Run/Crank) | Power Mode Transmitted |
|---|---|---|---|
| Off | 0 | 0 | OFF/Awake or RAP |
| Start | 0 | 1 | Crank |
| Accessory | 1 | 0 | Accessory |
| Run | 1 | 1 | Run |