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post #1 of 8 (permalink) Old 09-16-2015, 10:52 PM Thread Starter
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CAN Bus and audio

I see some references to Intrepid/Jeep radios related to CAN Bus... as far as our era of radios is concerned, is the CAN Bus only used for steering wheel audio controls? i.e. since my 99 Trep has no steering wheel audio controls, can I just ignore the CAN Bus issue entirely?

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post #2 of 8 (permalink) Old 09-17-2015, 02:39 AM
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Any round faced radio should work regardless of whether or not you have steering wheel audio controls (the only difference between vehicles with and without these controls is the clockspring, the switches in the backplate of the steering wheel, and the steering wheel backplate).
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post #3 of 8 (permalink) Old 09-17-2015, 09:00 AM
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LH cars use the PCI Bus for communication between modules not the CAN Bus. The CAN Bus is found on LX cars and others. The Steering Wheel Audio Controls are communicating over the PCI Bus in our LH cars.

Here's an excerpt from the Body Diagnostics Manual regarding Audio Systems in the LH cars.

3.2 AUDIO SYSTEM
There are radio systems available that communicate
on the PCI bus. They use the bus for three
reasons. First is to communicate trouble codes,
second is to control the remote radio switches located
on the back of the steering wheel, and third is
for use with the driver memory selection system.
The radio stores two sets of station presets and can
be recalled by pressing the optional memory select
button (located on the drivers door). The midline
will have 6 speakers and a 120 watt external
amplifier. The Infinity I will have 7 speakers and a
240 watt external amplifier or with a indash 4-disk
CD Player. The Infinity II will have 9 speakers and
a 360 watt external amplifier with a indash 4-disk
CD Player.
When troubleshooting output shorts or ‘‘output’’
error messages, the following applies:
On radios with out an external amplifier, the
term output refers to the path between the radio
and the speaker. This type of circuit can be monitored
all the way through the speaker connections
by the radio assembly. When the radio displays a
shorted output DTC with this type of system, the
speaker, radio, or wiring could be at fault.
On radios with an external amplifier, the term
‘‘output’’ refers to the circuit between the radio
connector and the amplifier. The radio is capable of
monitoring only this portion and can tell nothing
about the circuit between the amplifier and the
speakers. Consequently, a shorted output DTC on
this type of system would only refer to this circuit.
A faulty speaker could not cause this DTC.
These radios can be controlled via remote radio
switches (optional). These switches are located on
the back side of the steering wheel. They control
volume, preset bank selection, seek and scan functions.
These functions are inputs to the body controller
and can be read with the DRBIIIt under ‘‘body’’
systems, sensor displays. The switches are a multiplexed
signal to the BCM. The remote radio control
circuit is a five volt line that is pulled to ground
through different value resistors built into the
switches. This causes a voltage drop to be seen by
the body controller and it sends a specific message
to the radio on the PCI bus line. The radio then
responds to the message.
This circuit is fairly simple to troubleshoot. The
circuit must be complete from the switches in the
steering wheel to the BCM. The ground must be
complete so that the switches can cause the voltage
drop for the BCM to see. The circuit passes through
the clockspring so continuity throught this device
must be verified.

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post #4 of 8 (permalink) Old 09-17-2015, 08:30 PM
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What is it regarding the CAN Bus and Intrepid audio that you're seeing. Some links to reference?
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post #5 of 8 (permalink) Old 09-25-2015, 01:09 AM Thread Starter
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I was looking at some third party units that required you to select a "high speed" or "low speed" CAN Bus adapter. I ended up ordering a more generic unit (http://www.amazon.com/gp/product/B00NPM37U0) that has no mention of CAN Bus.

The unit I ordered is double-DIN so now I get to figure out exactly what I need to cut to widen the radio space to accept it, without making it all look horrible in the process.

Last edited by celamantia; 09-25-2015 at 01:11 AM.
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post #6 of 8 (permalink) Old 09-25-2015, 01:12 AM
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Again the CAN bus is mainly geared towards the LX line and others. With the LX cars it matters whether it's high or low speed CAN Bus depending on model year.

The LH cars have no use for the CAN bus at all. PCI Bus only.
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post #7 of 8 (permalink) Old 09-27-2015, 01:44 AM Thread Starter
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New head unit is here, unfortunately no sound.I hooked up the blue wire which should turn on the midline amp but no go. Fuse is good. Still I suspect the amp isn't coming on. I had an RBQ in there with a homemade adapter to convert to my '99's double 7-pin connector. Fun.
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post #8 of 8 (permalink) Old 09-27-2015, 11:14 AM Thread Starter
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Ended up just having a bent pin in a connector. Got sound now.
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