| All values measured to ground unless otherwise noted | |||
| K40/2 | |||
| C1.1 | Circuit 15R power input, switched by EIS ECM | 12 VDC with key in steering lock position "1" | Feed via Z3/27 |
| C1.2,3 | Circuit 30 main power input | 12 VDC at all times | Feed from battery via X4 |
| C1.4 | Main ground to W1 | Approx. 0 Ohms to ground | |
| M2.2 | Circuit 87 F fanfare horns power supply, switched by relay K40/2k6 | Ignition on 12 VDC with fanfare horns activated | Feed from battery, fuse protected by K40/2f4 |
| SAM | Fixed connection to SAM ECM | ||
| N73 | |||
| A.2,3 | Circuit 30 main power input | 12 VDC at all times | Feed from X4 |
| A.4 | Circuit 15R power output | 12 VDC with key in steering lock position "1" | |
| B.3 | Main ground to W1 | Approx. 0 Ohms to ground | |
| B.8 | Horn contact switched ground signal input | Ignition off, approx. 0 Ohms or Ignition on, measure to circuit 30, depress horn contact 12 VDC |
|
| B.10 | CAN Class B bus (high side). Mid speed data transfer bus input and output, exchanges data with SAM ECM | No reliable test. Check continuity of wiring. Approx. 5 VAC when data is on bus | Note 2 |
| B.11 | CAN Class B bus (low side). Mid speed data transfer bus input and output | See pin 2.1 | |
| C.1 | CAN Class C bus (high side). High speed data transfer bus input and output, exchanges data with other ECMs | No reliable test. Check continuity to other ECMs. Approx. 5 VAC when data is on bus | Note 2 |
| C.2 | CAN Class C bus (low side). High speed data transfer bus input and output | See pin C.1 | |
| Note 1 | Due to various functions K40/2 and N73 are split up in several system diagrams, therefore only the relating pins are listed. Pins not shown are unrelated to this system | ||
| Note 2 | N73 is gateway for data exchange between CAN Class B and Class C bus | ||