Specifications

22
Pinouts for Motorola 8000 “brick” phone - “N” series
numbering starts on top row left
pin Signal
1 logic ground
2 not used
3 audio in to phone
4 audio out (and on/off toggle)
5 4.75 Bias
6 Manual test line
7 Ground for audio signals (common)
8 TRU data line
9 not used
10 CMP data line
11 RTN data line
12 ignition sense
15 pin cable pinouts
PIN DESIGNATION/FUNCTION
1 Battery A+, red wire
2 Transmit Audio / ON-OFF Function, a shared line between Audio (AC) and ground. This line will
toggle the ON/OFF status of the telephone.
3 Ground (A+ return), black wire
4 Ignition Sense Lead, green with a black tracer
5 Receiver Audio (RX High), to handset connector pin 8
6 Regulated +9.5 volts, to handset connector pin 2
7 T-Data, one of the 3-wire bus lines, to handset connector pin 3
8 C-Data, one of the 3-wire bus lines, to handset connector pin 4
9 Digital Hands-Free Microphone / Manual Test. When the pin is grounded, which can be done by
shorting the two connectors of the Hands-Free microphone, the unit is enabled to work in TEST MODE.
10 R-Data, one of the 3-wire bus lines, to handset connector pin 5
11 Handset Logic Ground, to handset connector pin 1
12 Speaker High \ Only on SKN4279A and SKN4277A
13 Speaker Low /
14 Handset Audio Ground, to handset connector pin 6
15 Auxiliary Alert, yellow lead with a black tracer, used to blow the horn or flash the headlights. Provides
a ground for the relay; maximum current is 1/2 amp. It is *N O T* recommended that this circuit be
used to drive the horn or headlights directly.
OEM 32 pin cable pinouts
16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
+----------------------------------------------+
Note: Looking into connector C |* * * * * * * * * * * * * * * *|
on the transceiver with the D |* * * * * * * * * * * * * * * *|
antenna port down. +----------------------------------------------+
Pin# Designation/Function Row C Pin# Designation/Function Row D
1 Battery A+ 1 Not Used
2 Ignition Sense 2 Antenna Drive (for power antenna)
3 Status Display Control 3 Not Used
4 Not Used 4 Auxiliary Alert, used to blow the horn or flash the
headlights through a relay
5 Ground (A+ Return) 5 Not Used
6 GM Proprietary Serial Data Bus 6 GM proprietary serial bus
7 Audio Ground, from GM Audio
bus to telephone
7 Audio Ground (not connected)
8 Low level audio, from telephone
to GM Audio bus
8 Low Level Audio (not used)
9 Not used 9 Manual Test Line; when grounded this line enables TEST
MODE
10 Not used 10 RX High
11 Mobile / Transportable select
line
11 Ground (TX Shield)
12 Handset Logic Ground 12 Regulated +9.5 volts
13 T-Data, one of the 3-wire bus
lines
13 C-Data, one of the 3-wire bus lines
14 R-Data, one of the 3-wire bus
lines
14 Audio Ground
15 TX High / ON-OFF 15 Ground (Rx Shield)
16 VSP Microphone High 16 VSP Microphone Ground