| All values measured to ground unless otherwise noted | |||
| N70 | |||
| A.1 | Main ground to W19 | Approx. 0 Ohms to ground | |
| A.2 | Circuit 30 main power input | 12 VDC at all times | Feed from F1f30 |
| A.3 | CAN Class B bus (low side). Mid speed data transfer bus input and output, exchanges data with other ECMs | No reliable test. Check continuity to all appropriate ECMs. Approx. 5 VAC when data is on bus | |
| A.5 | Driver-side outside rearview mirror dimming element voltage supply | No reliable test | Note 2 |
| A.6 | CAN Class B bus (high side) | See pin A.3 | |
| A.8 | Driver-side outside rearview mirror dimming element voltage supply | See pin A.5 | Note 2 |
| C.1 | ??? | ||
| C.4 | Circuit 15R power output | 12 VDC with key in steering lock position "1" | |
| C.5 | ??? | ||
| C.6 | Backup mode recognition signal input | Ignition on, shift lever in position "R" 12 VDC, all other positions 0 VDC | |
| C.8 | Ground output | Approx. 0 Ohms to ground | |
| N72 | |||
| 1.1 | Backup recognition signal input, disables dimming function in backup mode |
Ignition on, gear shift lever in position "R" 12VDC, mirror surface becomes brighter | |
| 1.3 | CAN Class B bus (low side). Mid speed data transfer bus input and output, exchanges data with other ECMs | No reliable test. Check continuity to all appropriate ECMs. Approx. 5 VAC when data is on bus | |
| 1.4 | CAN Class B bus (high side) | See pin A.3 | |
| 1.5 | Circuit 30 main power input | 12 VDC at all times | Feed from F1f7 |
| 1.6 | Main ground to W18 | Approx. 0 Ohms to ground | |
| Note 1 | Due to various functions N70 and N72 are split up in several system diagrams, therefore only the relating pins are listed. Pins not shown are unrelated to this system | ||
| Note 2 | Dimming functional test | Cover daylight sensor of interior mirror, mirror surface of interior and driver-side outside mirrors become dark with flashlight shining towards interior mirror | |