| All values measured to ground unless otherwise noted | |||
| A35 | |||
| 3 | Main ground to W6 | Approx. 0 Ohms to ground | |
| 4 | Circuit 30 main power input | 12 VDC at all times | |
| 5 | Circuit 15R power input | Key in steering lock position "1" 12 VDC | |
| 8 | Control voltage output | 9.5 VDC with phone operational | |
| 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 | |
| 16 | Circuit 30 main power input | 12 VDC at all times | Same as pin 4 |
| 17 | Main ground to W6 | Approx. 0 Ohms to ground | Same as pin 3 |
| 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 | |
| 9,13,21,22 | Pins not used | ||
| Note 1 | Shield connection prevents from interference which might cause signal distortion | ||
| Note 2 | Pins 1,6,7,11,12,18,23,24 only carry system interchanging signals. | No reliable test, check continuity of wiring connection | |