2
Diagnostics, Troubleshooting and Testing
23
WABCO
Maintenance Manual MM-1306 (Revised 08-18)
Radar Inspection and Preventive
Maintenance
Radar Inspection
NOTE:
It is recommended to perform the radar inspection process
every time normal preventive maintenance is performed on the
vehicle.
1.
Remove the fascia and inspect the bumper positioning. Verify
the bumper is not physically touching the radar sensor, fascia
or mounting bracket at any point.
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If the bumper is touching the fascia:
Reposition the
bumper so there is a minimum of 1/4-inch (6.35 mm)
clearance between it and the fascia at all points.
2.
Visually inspect the radar connector and housing for any
damage. Inspect the edge of the fascia for any signs of wear or
prior contact with the bumper. Also, inspect the routing of the
radar sensor harness to ensure it is not pinched in the bumper
or damaged at any point. The rubber boot on the radar harness
connector must fully cover the connector.
3.
Verify the radar sensor and mounting hardware is secure.
4.
If the radar passes all of these inspections, reinstall the fascia.
Radar System Troubleshooting
NOTE:
Before troubleshooting the OnGuard™ and
OnGuardACTIVE™ CMS DTCs or concerns, check for DTCs in all
other vehicle systems communicating on the J-1939 network.
Many vehicle stability systems apply the service brakes, as well as
engine retarder and/or de-rate the engine to accomplish their
designed function. The following, although not all-inclusive, is a list
of such systems. For information about non-WABCO systems, refer
to the system manufacturer’s documentation:
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Cruise Control
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Electronic Stability Control (ESC)
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Automatic Traction Control (ATC)
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Roll Stability Control (RSC)
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Trailer Roll Stability Support (RSS)
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OnGuard™ and OnGuardACTIVE™
The OnGuard™ and OnGuardACTIVE™ CMS monitors and utilizes
other system messages on the J-1939 network allowing it to
function without interfering with vehicle stability systems, and
engine/transmission/speed parameters.
The OnGuard™ and OnGuardACTIVE™ CMS sets a DTC whenever
messages from the other control modules on the J-1939 network
are incomplete, not plausible, or not received.
If the J-1939 network is unstable or overloaded by vehicle
telematics messages, interruptions result.
NOTE:
Per SP-1375, damage or system concerns related to
malfunctions and failure codes caused by other electronic
sub-system failures (data bus, engine, transmission, dashboard,
etc.) are excluded from WABCO warranty coverage.
Refer to the Diagnostic Trouble Code Table for further information.
The following sections and sub-sections are referenced in the last
column of the Diagnostic Trouble Code Table.
NOTE:
Unintended braking events or other driveability concerns
may occur without active or stored DTCs. Ensure all service
alignments as prescribed in the Required Maintenance section have
been completed.
If driveability concerns persist with no DTCs or assignable cause,
contact WABCO North America Customer Care at 855-228-3203.
for further assistance.
NOTE:
Before calling WABCO North America Customer Care,
please download the system DTC report and the parameter (par) file
or Fleet Data Report using TOOLBOX™ Software. Email the files to
OnTrac at: [email protected] with the case number (if known)
and DTC Report in the subject line.
Radar Sensor Connector Corrosion
Radar sensor connector corrosion results when the radar sensor
connector or protective rubber boot have been incorrectly installed
following service. When the connector is not fully seated during
installation or repair activities, water, corrosive road salts or other
contaminants can enter the radar sensor connector. Ensure the
radar connector and harness are secured and correctly connected
and the environmental seal is intact to prevent water intrusion and
corrosion.
