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Test readings, 18-pin telephone connector connections

Test readings, 18-pin telephone connector connections


Pin no.

Component/

function

In/Out

Test conditions

Across

Test reading

See

1

Ground, mobile phone

-

-

-

-



2

Not connected

-

-

-

-



3

Not connected











4

Telephone Mute Control

-

No telephone call.

4-1

4-6 V









Telephone call.

4-1

<2 V



5

Function, hazard flashers

-

-

-

-



6

Not connected

-

-

-

-



7

Telephone line output, ground

-

-

-

-



8

Not connected

-

-

-

-



9

Ground, microphone

-

-

-

-



10

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

Power supply (+30 circuit)

-

Connector not connected.

11-1

B+



12

Not connected

-

-

-

-



13

Not connected

-

-

-

-



14

Horn

-

-

-

-



15

Not connected

-

-

-

-



16

Telephone line output, signal

-

-

-

-



17

Not connected

-

-

-

-



18

Microphone (low-level output)

-

-

-

-