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Test readings, 18-pin telephone connector

Test readings, 18-pin telephone connector


Pin No.

Lead colour

Component/

function

In/Out

Test conditions

Across

Test reading

See

1

BK

Ground, mobile phone

-

-

-

-



2



Not connected

-

-

-

-



3



Not connected











4

BU/RD

Telephone Mute Control

-

No telephone call.

4-1

4-6 V











Telephone call.

4-1

<2 V



5

OG

Function, hazard flashers

-

-

-

-



6



Not connected

-

-

-

-



7

BK/BN

Telephone line output, ground

-

-

-

-



8



Not connected

-

-

-

-



9

YE

Ground, microphone

-

-

-

-



10

YE/GY

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

-

Not connected. Ignition ON.

10-1

B+



11

RD

Power supply +30

-

Not connected.

11-1

B+



12



Not connected

-

-

-

-



13



Not connected

-

-

-

-



14

YE/WH

Horn

-

-

-

-



15



Not connected

-

-

-

-



16

OG

Telephone line output, signal

-

-

-

-



17



Not connected

-

-

-

-



18

BK

Microphone (low-level output)

-

-

-

-