Dtc U1500 - Suzuki XL7 2007 Service Manual

DTC U1500

DTC Descriptor
DTC U1500 00: Inter-Device Dedicated Bus 1
Diagnostic Fault Information
Perform the "Diagnostic System Check - Vehicle Diagnostic Information: " prior to using this diagnostic procedure.
Circuit
CAN Bus High Serial Data
CAN Bus Low Serial Data
CAN Bus High Terminated Serial Data
CAN Bus Low Terminated Serial Data
Circuit/System Description
Modules connected to the CAN bus serial data circuits
are high speed serial data modules that monitor for
serial data communications during normal vehicle
operation. Operating information and commands are
exchanged among the modules. The modules have
prerecorded information about what messages are
needed to be exchanged on the serial data circuits. The
messages are supervised and also, some periodic
messages are used by the receiver module as an
availability indication of the transmitter module. Each
message contains the identification number of the
transmitter module.
The electronic brake control module (EBCM) activates
the other modules connected to the CAN serial data
circuits by applying voltage when the ignition key is in
ACC, ON or START. The EBCM, Yaw Rate Sensor, and
the Steering Angle Sensor are the only modules
connected to the CAN bus serial data circuits. For more
information on CAN bus serial data refer to "Data Link
Communications Description and Operation".
Conditions for Running the DTC
• The system voltage is between 9-16 volts.
• The vehicle power mode master requires serial data
communication to occur.
Conditions for Setting the DTC
A no communication condition exists on the CAN bus
serial data for the EBCM.
Short to Open/High
Ground Resistance
U2105-U2199
U1500 (U2142 or U2143
only)
U2105-U2199
U1500 (U2142 or U2143
only)
U2105-U2199
U1500 (U2142 or U2143
only)
U2105-U2199
U1500 (U2142 or U2143
only)
Action Taken When the DTC Sets
• The Vehicle stability Enhancement System (VSES), if
equipped, and Traction Control System (TCS) will not
function.
• System OFF lamps will illuminate for these systems.
Conditions for Clearing the DTC
• A current DTC clears when the malfunction is no
longer present.
• A history DTC clears when the module ignition cycle
counter reaches the reset threshold, without a repeat
of the malfunction.
Diagnostic Aids
• An open on 1 CAN Bus circuit will not cause a U1500
DTC.
• If there are multiple non-communicating modules
choose the one farthest from the EBCM.
Reference Information
Schematic Reference
• "Data Communication Schematics"
• "Control Module References: "
Connector End View Reference
"Master Electrical Component List: "
Electrical Information Reference
• "Circuit Testing: "
• "Connector Repairs: "
• "Testing for Intermittent Conditions and Poor
Connections: "
• "Wiring Repairs: "
Data Communications:
Signal
Short to Voltage
Performance
U1500
U1500
U1500
U1500
10B-23
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