9
Narrowing Down the Problem (1.2)
Questions Next Steps
Has the system worked without
problems in the past but is not
working as expected now?
This is a good indication that something has changed. Review the following questions with
the driver to further diagnose the problem.
Has the radar sensor been
changed recently?
If so, the new radar sensor may be incompatible with the vehicle. In addition, check any
system Diagnostic Trouble Codes (DTCs) with Bendix
®
ACom
®
PRO
™
Diagnostic Software.
Refer to Section 2.5: Diagnostic Trouble Codes.
Checktheradarsensorbaudrate.Conrmthepartnumber(locatedonthefrontfaceof
theradarsensor)isthecorrectpartnumberperthevehicle'sVIN.Conrmtheradarsensor
is not installed backwards (the connector tab on the radar sensor is a good reference).
Did the radar sensor currently on
the vehicle come from another
vehicle?
The radar sensor may be incompatible with the new vehicle. Check system DTCs with
Bendix ACom PRO Diagnostic Software. Refer to Section 2.5: Diagnostic Trouble Codes.
With cruise control set, does the
system consistently apply the
foundation brakes when a forward
vehicle slows?
This is normal operation. If the radar system interventions are not typical, the radar sensor
may be misaligned.
Inspect the radar mounting. A solid mounting surface is necessary in order to hold the
alignment. If the bumper or mounting cross-member is damaged, replace it.
The service technician will need to check trouble codes as well. Read Section 2.5:
Diagnostic Trouble Codes.
Does a DTC seem to occur when
driving through the desert or in
barren areas (no road signs, trees,
or vehicles)?
In normal operation, the active cruise control with braking feature of the Bendix Fusion
system may indicate a DTC if it hasn’t detected a metallic object after a pre-determined
period. This is rare, but most likely to occur when driving in deserts or barren areas. If
the system does set a DTC, the Bendix Fusion system provides a visible warning to the
driver, but cruise control will still be active. Full and proper radar sensor functionality will be
restored after a power cycle.
Does the system seem to
disengage after an automatic
braking event?
This is normal operation. Contact the vehicle OEM for details on cruise control operation.
Does cruise control disengage
sometimes when the brakes come
on and not at other times?
This is normal operation. When traveling with lightly loaded trailers, or “bobtail”, the active
cruise control with braking feature of the Bendix Fusion system may continue to function
even after an automatic brake application. No driver input is needed. Contact the vehicle
OEM for details on cruise control operation.
Does the connector or wiring
appear damaged?
Wires can become corroded if the radar sensor is not plugged in properly. Clean the
connectors on the wire harness, as well as the radar sensor, and reattach. If wires are
chafed, replace the wire harness. Also, check for trouble codes.
Refer to Section 2.5: Diagnostic Trouble Codes and
Section 2.12: Troubleshooting Wiring Harnesses.
Does the system generate a DTC
going down a grade when using
ACB (Active Cruise-control with
Braking) to slow the vehicle, but the
code goes away later?
This is normal operation. The active cruise control with braking feature of the Bendix
Fusion system is not intended to be used on grades. Verify there are no DTCs. Proper
downgrade driving techniques should be used.
Refer to Section 2.5: Diagnostic Trouble Codes.
Does the radar sensor have
noticeable damage beyond normal
discoloration or surface scratches?
The radar sensor and bracket are very durable. However, if the radar sensor housing
or cover is cracked or broken, immediately look for trouble codes via Bendix ACom
PRO diagnostic software and replace the damaged radar sensor. Refer to Section 2.5:
Diagnostic Trouble Codes and Appendix A3: Radar Sensor Mounting Clearance.
Table 2 – Narrowing Down the Problem
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