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Test readings, 10-pin telephone connector connections

Test readings, 10-pin telephone connector connections


Pin No.

Lead colour

Component/

Function

In/Out

Test conditions

Across

Test reading

See

1

RD

Power supply +30

-

Connector not connected.

1-4

B+



2

YE/GY

Power supply +15. The input is used as a logic signal for certain mobile phones.

-

Connector not connected.

Ignition ON

2-4

B+



3

YE

Ground, microphone

-

-

-

-



4

BK

Ground, mobile phone

-

-

-

-



5

RD/BN

Telephone Mute Control

-

No telephone call.

5-4

4-6 V



Telephone call.

5-4

<2 V



6

GN/WH

Rheostat

-

-

-

-



7

OG

Telephone line output, signal

-

-

-

-



8

BN/BK

Telephone line output, ground

-

-

-

-



9

BK

Not connected

-

-

-

-



10

BK

Microphone (low-level output)

-

-

-

-