BENDIX BW2849 manual Component Code SID 248, FMI Vbus Error

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Fault Isolation Procedures

Component Code: 33

(SID 248, FMI 12)

VBUS Error

Overview

This fault code indicates the Antenna, Central Processing Unit, and/or Driver Display Unit are unable to communicate.

Detection

Starting at key on and throughout the operation, the Central Processing Unit constantly monitors the communication with the Antenna and Driver Display Unit. If a communication fault occurs for more than 5 seconds, fault code 33 is set.

Fallback

This fault causes a failure of the Bendix™ VORAD® system.

Required Tools

•Basic Hand Tools

•Troubleshooting Guide

•Digital Volt/Ohm Meter

Possible Causes

This fault code can be caused by any of the following:

•OEM Harness

•Antenna Assembly

•Central Processing Unit

•Driver Display Unit

Harness	Central
Driver	Processing Unit
Display Unit
2-81

Image 92

Contents Troubleshooting Guide Fault Isolation Procedures General WarningsSuggested Tools Related PublicationsSymptom Tests IntroductionPretests Component and System CodesDiagnostic Procedure YESFault Code Retrieval and Clearing Service ProcedureFault Code Isolation Procedure Index Fault Hand-Held CodesDriving Techniques Right Turn Signal System Key on. If the fault is present, Heat and vibration Brake Input Signal SystemOn. Apply Service Brake For Minimum Seconds. If Speed Input Signal SystemSeconds to set this fault Description Type of Code Driving Technique 250Symptom-Driving Index Fault Isolation Procedures Service Procedure Electrical Pretest OverviewStep a Electrical PretestMeasure resistance Key off Disconnect negative battery cableStep B Step C Power-Up Sequence Test Central Processing Unit Driver Display Unit Vehicle HarnessCentral DriverPower-Up Sequence Test Key on Observe the Driver If lights turn on the go offIf lights turn on and stay on Freightliner IDI Measure voltage If voltage is betweenMeasure resistance between If any of the above conditions are not met Go to Step DIf any of the above conditions are not met Go to Step E Step DKey off Measure resistance between Step E If any of the above conditions are not met Go to Step FStep F If any of the above conditions are not met Go to Step GAntenna 4-way connector Step GStep H Step Measure resistance between Central ProcessingAre not met Go to Step JStep J Key on Check error codes If no error codes If error codesStep K Go to Step LIf error codes Go to Step a Find error in testing Step LKey off Reconnect all connectors Key on Compatibility problem Contact your Bendix RepresentativeCheck for Codes. See If no codes Test complete Clearing on If code appearsThis page left blank intentionally Basic Hand Tools Troubleshooting Guide Component Code 11 SID 254, FMI 4 Central Processing Unit CPUIf code 11 is inactive Test complete Code 11, 12 SID 254, FMI 4, 12, Central Processing Unit CPUKey off Retrieve codes If code 11 is active This fault causes a failure of the Bendix Vorad system Component Code 13 SID 9, FMI 2, 4, 5 Driver Display UnitCode 13, 34 SID 9, FMI 2, 4, 5, 12 Driver Display Unit Available, go to Step B Go to StepIf voltage is 7.0 to 7.5 volts Driver Display Unit 4-wayStep C 5,12 Key off Measure resistance between Central ProcessingStep E Repair OEM wiring harness Unit. Go to Step Testing Appears Procedure Index onClearing on page 1 If code 13 or 34 appears If code other than 13 orComponent Code 14 SID 1, 2, FMI 2, 12 Antenna Assembly Pin 3 and pin If voltage is outside of range Key off Unplug the Antenna 4-way connector Key onCode 14, 35 SID 1, 2, FMI 2, 12, 14 Antenna Step C Step D Step E Step F Go to Step See Fault Code Isolation Clearing on page 1 If code 14 appearsComponent Code SID 10, FMI Right Side Sensor Key on Measure voltage between Pins a and B Pins a and C If voltage between pins aCode 15 SID 10, FMI 2 Right Side Sensor Right Side Sensor?If resistance is outside of range Go to Step D Measure resistance between Way pin C13 and 3-way pin B If resistance is outside of range Go to Step EReplace Central processing Unit. Go to Step See Fault Code Isolation Procedure Index on page 1 Component Code SID 11, FMI Left Side Sensor Code 16 SID 11, FMI 2 Left Side Sensor Left Side Sensor?If resistance is out of range Go to Step D Measure resistance between Way pin D13 and 3-way pin B If resistance is out of range Go to Step EIf resistance is out of range Clearing on page 1 If code 16 appears Index on page 1Component Code SID 7, FMI Right Turn Signal Right Central Processing Unit Turn SignalCode 21 SID 7, FMI 2 Right Turn Signal Repair OEM wiring harness asIf equipped with a Right Side Sensor Required. Go to StepIf voltage ﬂashes within Key off Turn on right turn signalVolts of battery voltage If code other than 21 appears Component Code SID 8, FMI Left Turn Signal LeftCode 22 SID 8, FMI 2 Left Turn Signal Key off Turn on left turn signal If voltage measures withinIf code other than 22 appears Component Code SID 3, FMI Brake Input Error This fault causes a failure of the Vorad systemCode 23 SID 3, FMI 2 Brake Input Error Go to Step B If the brake lights are notWorking correctly Go to Step Proper conﬁgurationCheck pin C9 on 32-way If there is a wire in C9 Connector If there is not a wire in C9Key off Depress brake pedal Check for Codes. See If no codes appear Test complete Clearing on page 1 If code 23 appearsThis page left blank intentionally Component Code SID 6, FMI Speed Input Error If vehicle uses J-1939 or 1587 conﬁguration Code 24 SID 6, FMI 2 Speed Input ErrorUnit 32-way connector Have pins in C10 and C11 Ohms Between speed sensor Pins a and B10K ohms or open circuit Clearing on page 1 If code 24 appears Resistor Component Code 25 SID 231, FMI 2, 12 Cruise Signal ErrorTerminating Way pin D7 and ground If resistance is outside of range Go to Step BSee Engine OEM for PIN Location See Engine OEM For PIN Location Key off Measure resistance Key off Reconnect engine ECU connector Key on If error codes Problem exists with Engine ECU. RepairIf code other than 25 appears This page left blank intentionally Component Code SID 250, FMI Data Link Error Code 31 SID 250, FMI 2 J-1587 Data Link Error If resistance is outside of range Go to Step C Key on If no communication errors If communication errorsIf code other than 31 appears This page left blank intentionally Component Code SID 248, FMI Vbus Error Code 33 SID 248, FMI 12 Vbus Error If any of the above conditions are not met Go to Step BIf any of the above conditions are not met Go to Step C Connector pin D5 Driver DisplayStep D On page 1 Clearing on page 1 If code 33 appearsSymptom Isolation Procedures Antenna Not Detecting TargetsAppropriate isolation Properly Go to Step a Procedure Side Sensor Not Detecting Targets Side Sensor Detection Test Go to Step D If voltage is outside of range Between pins 2Key on Measure voltage Measure resistance between Way pin C16 4-way pinWay pin C16 Ground Replace Side Sensor Display. Go to Step Go to Step EGo to Step Go to Step F Key off Measure resistance between Way pin C14Way pin C14 Ground Key off Measure resistance between Way pin C12 Way pin C12 GroundGround is more than If resistance is outsideStep Detection Test New Driver Card There is no fallback mode for this symptomDriver Card Not Reading Driver Card Detection Test Bendix Vorad System Wiring Diagram AppendixWiring Diagram EatonvoradFault Code Tree Nvram