Bendix Commercial Vehicle Systems VORAD VS-400 INSTALLATION NOTES - Manual (Page 28)

General Information
26
Diagnostic Trouble Code (DTC)
Isolation Procedures
Component Code: 33
(SA 42, SPN 639, FMI 2)
FLR J1939 Message Error
Overview
This code indicates that the Forward Looking Radar (FLR) has detected gaps or missing messages from the Driver Interface Unit (DIU) or
other devices on the J1939 data link .
Diagnostic Trouble Code (DTC) Detection
At power up and during operation, the FLR, DIU, and other devices continuously communicate with each other on the J1939 data link . If the
FLR detects gaps occurring in the messages from one of the devices or one of the devices stops communicating, the Diagnostic Trouble
Code (DTC) is set .
Symptom
The Bendix ™ VORAD ® VS-400 Collision Warning and the Bendix ™ SmartCruise ® adaptive cruise control will fail to operate and the orange
DTC light on the Driver Interface Unit will be illuminated . If SmartCruise ® adaptive cruise control is enabled, the vehicle’s cruise control may
not operate while this Diagnostic Trouble Code (DTC) is active .
Possible Causes
• Loose, corroded, or open J1939 data link connections
• Missing J1939 data link terminating resistor(s)
• Malfunctioning device on the J1939 data link causing other ECU's to fail communications
• Loss of power supply to the DIU
• Malfunctioning DIU
Repair Procedure
Active Diagnostic Trouble Code (DTC) Steps to Perform
Code 33, FMI 2
1 . Perform the "Component Power Supply Test" in the Appendix .
2 . Check the vehicle’s J1939 data link for poor connections or missing
terminating resistors .
3 . Verify that all ECU's on the data link are functional and not interfering with data link
communications .
Note: Isolate any suspect malfunctioning ECU’s by disconnecting them
from the data link .
4 . Perform Electrical Pretest to check data link and harness connections and harness to the
VS-400 components .
5 . If the Diagnostic Trouble Code (DTC) remains active with no Diagnostic Trouble Code
(DTC) found, replace the DIU and check operation .
6 . Test Complete .