Dodge Ram Truck 1500-2500-3500. Manual - part 271
3. Install the retaining bolt and ground strap to the
engine cylinder heads.
4. Tighten the retaining bolts.
5. Connect the battery negative cable.
SWITCH - REMOTE RADIO
DESCRIPTION
Two rocker-type switches (if equipped) are mounted
on the back (instrument panel side) of the steering
wheel spokes. The switch on the left spoke is the seek
switch and has seek up, seek down, and preset sta-
tion advance functions. The switch on the right spoke
is the volume control switch and has volume up, and
volume down functions. The switch on the right spoke
also includes a “mode” control that allows the driver to
sequentially select AM radio, FM radio, cassette
player, CD player or CD changer (if equipped).
OPERATION
The six switches in the two remote radio switch units are normally open, resistor multiplexed momentary switches
that are hard wired to the Integrated Power Module (IPM) through the clockspring. The IPM sends a five volt ref-
erence signal to both switch units on one circuit, and senses the status of all of the switches by reading the voltage
drop on a second circuit.
When the IPM senses an input (voltage drop) from any one of the remote radio switches, it sends the proper switch
status messages on the Programmable Communication Interface (PCI) data bus network to the radio receiver. The
electronic circuitry within the radio receiver is programmed to respond to these remote radio switch status messages
by adjusting the radio settings as requested. For diagnosis of the IPM or the PCI data bus, the use of a scan tool
and the proper Diagnostic Procedures information is recommended.
DIAGNOSIS AND TESTING
REMOTE SWITCHES
Any diagnosis of the Audio system should begin with the use of scan tool. For information on the use of
the scan tool, refer to the appropriate Diagnostic Service information.
For complete circuit diagrams, refer to the appropriate wiring information.
8A - 86
AUDIO - SERVICE INFORMATION
DR/DH