| All values measured to ground unless otherwise noted | |||
| A2/56 | |||
| A.1 | Right front VSS signal input | 0-2 VAC, 0-300 Hz with increasing vehicle speed | Feed from traction system ECM |
| A.2 | "Diagnostic port" for DTC readout and diagnostic purpose | No reliable test. Check continuity of wiring | |
| A.3 | CTEL mute ground signal input | Radio on, activate CTEL function: Radio switches to mute and display shows PHONE |
Refer to wiring diagrams 82.70 |
| A.4 | Circuit 30 power input | 12 VDC at all times | Feed from F1f10 |
| A.5 | Control voltage output for antenna and sound system amplifier | 12 VDC with radio on | |
| A.6 | Pin not used | ||
| A.7 | Circuit 15R power input | Ignition on 12 VDC | Feed from F1f3 |
| A.8 | Main ground to W18 | Approx. 0 Ohms to ground | |
| B | Without sound amplifier | ||
| B.1 B.2 |
Right rear audio signal plus output Right rear audio signal minus output |
Radio on > 0.2 VAC across pin B.1-B.2 | Note 1 |
| B.3 B.4 |
Right front audio signal plus output Right front audio signal minus output |
Radio on > 0.2 VAC across pin B.3-B.4 | Note 1 |
| B.5 B.6 |
Left front audio signal plus output Left front audio signal minus output |
Radio on > 0.2 VAC across pin B.5-B.6 | Note 1 |
| B.7 B.8 |
Left rear audio signal plus output Left rear audio signal minus output |
Radio on > 0.2 VAC across pin B.7-B.8 | Note 1 |
| B | With sound amplifier | see N40/3 | |
| C.4 |
Wake up output for other ECM's | Radio on approx. 10-14 VDC |
Refer to D. M. Info./Comm. Vol. 1, 6.1 |
| C.5 | Circuit 30 to CD Changer output | Ignition and radio on approx. 10-14 VDC | |
| C.6 | Ground to CD Changer output | Approx. 0 Ohms to ground | same as A.8 |
| C.8-10 | Ground to W18 | Approx. 0 Ohms to ground or 12 VDC to pin A.4 | Used for coding: With/without sound-system, 2-/4- channel speaker system |
| D | Audio antenna input connector | Radio frequency | |
| E | GPS antenna input connector | Radio frequency | |
| D2B IN D2B OUT |
Optical input port Optical output port |
No reliable test | |
| N40/3 | |||
| 1 2 |
Right front audio signal minus input Right front audio signal plus input |
Radio on > 0.2 VAC across pin 1-2 and volume to max. | |
| 3 | Left rear audio signal minus input | Radio on > 0.2 VAC across pin 3-5 and volume to max. | |
| 4 | Right rear audio signal minus input | Radio on > 0.2 VAC across pin 4-6 and volume to max. | |
| 5 | Left rear audio signal plus input | See pin 3 | |
| 6 | Right rear audio signal plus input | See pin 4 | |
| 10 | Left front audio signal minus input | Radio on > 0.2 VAC across pin 10-18 and volume to max. | |
| 18 | Left front audio signal plus input | See pin 10 | |
| Note 1 | Substitution test for speaker sytems Use signal generator |
Disconnect appropriate speaker and connect to a low frequency signal generator. Adjust output to approx. 2.5 Vpp and vary frequency over a range from 10 Hz to 15 kHz. Sound should be audible over most of the range, depending of speaker system under test (bass/tweeter) |
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