Grand Cherokee 4WD V8-5.2L VIN Y (1998)
RBR - AM/FM CD, 3 band E.Q., external amplifier
RBR - AM/FM CD, 3 band E.Q., external amplifier, CCD diagnostics.
RBN - AM/FM cassette, 5 band E.Q., external amplifier
RBN - AM/FM cassette, 5 band E.Q., external amplifier, equipped to handle external CD changer, CCD diagnostics.
RAZ - AM/FM cassette and CD player, 3 band E.Q., external amplifier
RAZ - AM/FM cassette and CD player, 3 band E.Q., external amplifier, CCD diagnostics.
The last three radios in the list are capable of displaying faults and allowing certain actuation tests through the use of the DRB. When attempting to
perform CCD diagnostics, the first step is to identify the radio in the vehicle. Use the above list and the radio face plate drawings.
Troubleshooting Hints For Audio Systems
TROUBLESHOOTING HINTS FOR AUDIO SYSTEMS
When troubleshooting channel shorts or channel error messages, the following applies:
On radios without an external amplifier, the term "channel" refers to the path from the radio connector to 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 channel DTC with this type of
system, the speaker could be at fault. The channel DTC could refer to a front or rear channel or a left or right channel. The reason for the
difference is in the pairing of the output sections of the radio. Some are paired left and right, others are paired front and rear.
On radios with an external amplifier, the term "channel" refers to the circuit between the radio connector and the amplifier. The radio is capable of
monitoring only this portion of the circuit and can tell nothing about the circuit between the amplifier and the speakers. Consequently, a shorted
channel DTC on this type of system would only refer to this circuit. A faulty speaker could not cause this DTC.
NOTE: The CCD radios have a new feature available. These radios can be controlled via remote radio switches located in the back of the steering
wheel. These switches control volume, preset bank selection, seek and scan functions. There are no fault codes associated with the remote control
feature.
These functions are inputs to the body controller and can be read with the DRB under "Body" systems, sensor displays. The switches are a
multiplexed signal to the body controller. It is a five volt line that is pulled to ground through different value resistors built into the switches and
cause a voltage drop to be "seen" by the body controller and the specific message is placed on the CCD bus line. The radio then responds to the
message.
This circuit is fairly simple to troubleshoot. It requires that the circuit be complete from the switches in the steering wheel to the BCM and that the
ground be complete so that the switches can cause a voltage drop for the BCM to "see". The circuit passes through the clock spring, so continuity
through the device must be verified.
Remote Keyless Entry (RKE) /Vehicle Theft Security System (VTSS)
