Test readings, 18-pin telephone connector connections
18-PIN TELEPHONE CONNECTOR CONNECTIONS TEST READINGS DESCRIPTION
| Pin No. | Cable colour | Component/ function | In/Out | Test conditions | Across | Test reading |
|---|---|---|---|---|---|---|
| 1 | BK | Ground, mobile phone | - | - | - | - |
| 2 | Not connected | - | - | - | - | |
| 3 | Not connected | |||||
| 4 | YE | Telephone Mute Control | - | No telephone call. | 4-1 | 4-6 V |
| Telephone call. | 4-1 | < 2 V | ||||
| 5 | GY | Function, hazard flashers | - | - | - | - |
| 6 | Not connected | - | - | - | - | |
| 7 | BK | Telephone line output, ground | - | - | - | - |
| 8 | Not connected | - | - | - | - | |
| 9 | BU | Ground, microphone | - | - | - | - |
| 10 | RD/BU | Power supply +15. The input is used as a logic signal for some types of mobile phone. | - | Connector not connected. Ignition ON. | 10-1 | B+ |
| 11 | RD | Power supply (+30 circuit) | - | Connector not connected. | 11-1 | B+ |
| 12 | Not connected | - | - | - | - | |
| 13 | Not connected | - | - | - | - | |
| 14 | OG | Horn | - | - | - | - |
| 15 | Not connected | - | - | - | - | |
| 16 | GY/WH | Telephone line output, signal | - | - | - | - |
| 17 | Not connected | - | - | - | - | |
| 18 | RD | Microphone (low-level output) | - | - | - | - |