| All values measured to ground unless otherwise noted | |||
| A35 | |||
| 1.3 | Main ground to W6 | Approx. 0 Ohms to ground | |
| 1.4 | Circuit 30 main power input | 12 VDC at all times | Feed from F1f10 |
| 1.5 | Circuit 15R power input | 12 VDC with key in position "1" | Feed from F1f3 |
| 1.7 | Circuit 58d input, "Dimmed Instrument Illumination" voltage | Varies from 0.5-12 VDC, depending on setting of dimming value and ambient brightness | |
| 1.8 | Control voltage output | 9.5 VDC with phone operational | |
| 1.9 | Control voltage output to CTEL antenna | 9.5 VDC with phone operational | |
| 1.10 | Mute signal output, interrupts radio system while CTEL system is operating | Radio on, activate CTEL system: Radio switches to mute, display shows "PHONE" | |
| 14 15 |
Hands free microphone signal input low side and shield high side |
No reliable test, check with test microphone | |
| 19 | HFS speaker "+" signal output | Check for AC voltage (approx. 1VAC) with a touch-tone button pressed Disconnect plug, measure < 10 Ohms across pins 19-25 |
|
| 20 | Shield connection | Note 1 | |
| 25 | HFS speaker "-" signal output | See pin 19 | |
| Note 1 | Shield connection prevents from interference which might cause signal distortion | ||
| Note 2 | Pins 1,2,6,11,12,17,18,21,22,23,24 only carry system interchanging signals. | No reliable test, check continuity of wiring connection | |