2
Diagnostics, Troubleshooting and Testing
9
WABCO
Maintenance Manual MM-1306 (Revised 08-18)
OnGuard™ and OnGuardACTIVE™ DTCs may be generated and
displayed during service procedures on other electrical system
components (i.e., engine, transmission, ABS, etc.). If the display
screen turns amber with error screens or DTCs visible after the
vehicle has been serviced for other vehicle system issues, cycle the
ignition OFF for at least two minutes, turn the ignition back ON, start
the engine and run at idle speed for one minute. OnGuard™ and
OnGuardACTIVE™ DTCs caused by other systems that have been
repaired should be cleared. If active DTCs remain, continue
troubleshooting.
If the CMS is not correctly tracking vehicles that are in your lane or is
tracking vehicles that are not in your lane, this may be due to radar
operational issues.
Typically these are radar operational issues that can result from the
following problems:
앫
Debris (dirt, snow, ice) on the radar fascia or between the fascia
and the radar sensor. This must be removed.
앫
The radar sensor may be loose or not tightly secured on the
mounting bracket.
앫
The radar sensor may be too close to or actually contacting the
bumper as mounted, which will affect the radar signal. There
should be at least 1/4 inch of clearance between the fascia,
radar sensor or bracket and the bumper. Contact your vehicle
manufacturer representative on adjustments to the bumper for
radar sensor clearance.
앫
The radar may not be aligned correctly. Refer to the Radar
Sensor Service Alignment procedure.
If the vehicle’s standard cruise control is working and the
OnGuard™ or OnGuardACTIVE ™ ACC is not working, consult your
dealer or engine supplier. This can occur if the engine controller has
been re-programmed or the engine parameter that activates ACC
has been turned off. Consult with your dealer or engine supplier for
engine software and parameter adjustments.
Diagnose J1939 wiring harness.
Electrical System
and Harness
Troubleshooting
"NO ACC" indicates that ACC is not available due to
an error. CMS is still active. Cruise control is
disabled. Diagnose with TOOLBOX™ Software and
Diagnostic Trouble Code Table to determine reason
for disabled ACC.
TOOLBOX™
Software and
Diagnostic Trouble
Code Table
Display Message
Repair Action
Troubleshooting
Section
40103
9
1
a
No J1939 Messages
CAN BUS ERROR
CHECK CONNECTIONS
40118
6
4
a
NO CMS
