Chrysler Conquest 1988 Service Manual page 253

AUDIO SYSTEM
- Radio Remote Control
8-241
Steering
wheel
\
Column
/
/
LE6
Seen from position Z LED
Receptor
amplifier
Receptor diode
16Y2748
shaft
I
Range not covered by LED A
16Y2781
1. When the radio switch in the steering wheel is pressed, the
controller emits a corresponding electrical signal.
Reference
The electrical signal used in this radio remote-control system is
called a Pulse coordinate modulation code. The correspon-
dence with the switch keys is as described below.
Pulse coordinate modulation
Key
input (command)
SEEK 0 0 0 1 0 0 0 0
M. CALL 0 0 0 1. 1 1 0 0
FM/AM 0 0 0 1 1 0 0 0
2. The infra-red ray LED flashes according to that signal.
3. The infra-red ray beam reaches the photo-diode in the
column either directly or indirectly due to reflection.
Note that two LEDs are located 180°C apart to assure that
the infrared beams reach all around the column. This is to
provide a back up LED if the first one is in the "shadow" of
the steering shaft.