Dtc B1025, B1035, B1045, Or B1055 - Suzuki XL7 2007 Service Manual

DTC B1025, B1035, B1045, or B1055

DTC Descriptors
DTC B1025: LF Audio Output Circuit
DTC B1035: RF Audio Output Circuit
DTC B1045: LR Audio Output Circuit
DTC B1055: RR Audio Output Circuit
Diagnostic Fault Information
Perform the "Diagnostic System Check - Vehicle
Diagnostic Information: " prior to using this diagnostic
procedure.
Circuit/System Description
The radio head unit provides four discrete channels to
the speakers. Each channel consists of two wires that
connect to a speaker. During normal operation, the radio
applies approximately 5-6 volts to the plus (+) and minus
(−) terminals at the speaker. The terminals attach to the
speaker voice coil.
In order for the speaker to produce sound, the amplifier
in the radio will raise the voltage on one terminal and
lower the voltage on the opposite terminal, then quickly
reverse the polarity. The constant switching of the
electrical signal causes the voice coil and speaker cone
to move rapidly in two directions. The movement of the
speaker cone produces sound.
Conditions for Running the DTC
The following are conditions that must be present in
order for the radio to enable the diagnostics.
• The radio is in the ACCESSORY, RUN, or RAP power
mode.
• The system voltage is at least 9 volts and no more
than 16 volts.
Conditions for Setting the DTC
The following conditions are present for 250 ms or
longer.
• One of the speaker output circuits is shorted to
battery.
• One of the speaker output circuits is shorted to
ground.
Action Taken When the DTC Sets
The radio disables the audio output to the speaker with
the current fault, producing no sound from the speaker.
Cellular / Entertainment / Navigation / Audio:
Conditions for Clearing the DTC
• The conditions for setting the DTC are no longer
present.
• A history DTC clears after 100 malfunction-free
ignition cycles.
• The radio receives the clear code command from the
scan tool.
Diagnostic Aids
With the use of Co-axial speakers, some sound (Bass or
Treble) may be coming from the speakers depending on
what circuit has been affected. Adjusting the bass and
treble accordingly to identify faulty circuit may help with
diagnosis.
Reference Information
Schematic Reference
"Radio/Navigation System Schematics"
Connector End View Reference
"Entertainment/Communication Connector End Views"
Electrical Information Reference
• "Circuit Testing: "
• "Connector Repairs: "
• "Testing for Intermittent Conditions and Poor
Connections: "
• "Wiring Repairs: "
Scan Tool Reference
"Scan Tool Data List - Cellular, Entertainment, and
Navigation"
Special tool
J 39916-A CD and Cassette Diagnostic Audio Kit
Circuit/System Verification
Verify customer complaint by adjusting speaker outputs
through the radio controls, fade and/or balance.
Circuit/System Testing
1. Test the speaker circuits for an open, short to
voltage, or short to ground.
➢ Test for 5-6 volt on speaker signal (+) and return (−)
circuits during the short condition
2. If the circuit tests normal, test or replace the radio.
Repair Instructions
Perform the "Diagnostic Repair Verification - Vehicle
Diagnostic Information: " after completing the diagnostic
procedure.
"Radio Replacement"
9O-34