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Test readings, 10-pin telephone connector connections

Test readings, 10-pin telephone connector connections


Pin no.

Cable colour

Component/

Function

In/Out

Test conditions

Across

Test reading

See

1

RD

Power supply +30

-

Not connected.

1-4

B+



2

BU/RD

Power supply +15. The input is used as a logic signal for some types of mobile phone.

-

Not connected.

Ignition ON.

2-4

B+



3

GN

Ground, microphone

-

-

-

-



4

BK

Ground, mobile phone

-

-

-

-



5

YE

Telephone Mute Control

-

No telephone call.

5-4

4-6 V



Telephone call.

5-4

<2 V

6



Not connected

-

-

-

-



7

GY/WH

Telephone line output, signal

-

-

-

-



8

BK

Telephone line output, ground

-

-

-

-



9



Not connected











10

BN/GY

Microphone (low-level output)

-

-

-

-