Electrical Pretest, Overview | BENDIX BW2849 specification

Fault Isolation Procedures

Electrical Pretest

Overview

The pretest does not relate to any speciﬁc fault code, but must be completed before performing Fault Code Isolation Table procedures. The pretest veriﬁes the basic electrical inputs before testing individual circuits.

Required Tools

•Basic Hand Tools

•Digital Volt/Ohm Meter

•Troubleshooting Guide

Detection

There is no detection process speciﬁcally for the basic electrical supply. However, failures of this type are generally detected by the Bendix™ VORAD® system or the driver as some other type of fault code or symptom.

Fallback

There is no fallback for the electrical pretest, however, it may affect other systems.

Possible Causes

This pretest can be used for any of the following:

•Corroded Power Contacts

•Blown Fuse

•Wiring Harness

•Low Batteries

Harness

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BENDIX BW2849 manual Electrical Pretest, Overview

Contents

Troubleshooting Guide Fault Isolation Procedures General WarningsSuggested Tools Related Publications Symptom Tests IntroductionPretests Component and System Codes Diagnostic Procedure YES Fault Code Retrieval and Clearing Service Procedure Fault Code Isolation Procedure Index Fault Hand-Held Codes Driving 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 System Seconds to set this fault Description Type of Code Driving Technique 250 Symptom-Driving Index Fault Isolation Procedures Service Procedure Electrical Pretest Overview Step a Electrical Pretest Key off Disconnect negative battery cable Step BMeasure resistance Step C Power-Up Sequence Test Central Processing Unit Driver Display Unit Vehicle HarnessCentral Driver Power-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 between Measure resistance between If any of the above conditions are not met Go to Step D Step D Key off Measure resistance betweenIf any of the above conditions are not met Go to Step E Step E If any of the above conditions are not met Go to Step F Step F If any of the above conditions are not met Go to Step G Antenna 4-way connector Step G Step H Step Measure resistance between Central ProcessingAre not met Go to Step J Step J Key on Check error codes If no error codes If error codesStep K Go to Step L If error codes Go to Step a Find error in testing Step L Key off Reconnect all connectors Key on Compatibility problem Contact your Bendix RepresentativeCheck for Codes. See If no codes Test complete Clearing on If code appears This page left blank intentionally Basic Hand Tools Troubleshooting Guide Component Code 11 SID 254, FMI 4 Central Processing Unit CPU Code 11, 12 SID 254, FMI 4, 12, Central Processing Unit CPU Key off Retrieve codes If code 11 is activeIf code 11 is inactive Test complete This fault causes a failure of the Bendix Vorad system Component Code 13 SID 9, FMI 2, 4, 5 Driver Display Unit Code 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-way Step C 5,12 Key off Measure resistance between Central Processing Step 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 or Component Code 14 SID 1, 2, FMI 2, 12 Antenna Assembly Key off Unplug the Antenna 4-way connector Key on Code 14, 35 SID 1, 2, FMI 2, 12, 14 AntennaPin 3 and pin If voltage is outside of range Step C Step D Step E Step F Go to Step See Fault Code Isolation Clearing on page 1 If code 14 appears Component 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 E Replace 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 E If resistance is out of range Clearing on page 1 If code 16 appears Index on page 1 Component Code SID 7, FMI Right Turn Signal Right Central Processing Unit Turn Signal Code 21 SID 7, FMI 2 Right Turn Signal Repair OEM wiring harness asIf equipped with a Right Side Sensor Required. Go to Step Key off Turn on right turn signal Volts of battery voltageIf voltage ﬂashes within If code other than 21 appears Component Code SID 8, FMI Left Turn Signal Left Code 22 SID 8, FMI 2 Left Turn Signal Key off Turn on left turn signal If voltage measures within If code other than 22 appears Component Code SID 3, FMI Brake Input Error This fault causes a failure of the Vorad system Code 23 SID 3, FMI 2 Brake Input Error Go to Step B If the brake lights are notWorking correctly Go to Step Proper conﬁguration Check pin C9 on 32-way If there is a wire in C9 Connector If there is not a wire in C9 Key off Depress brake pedal Check for Codes. See If no codes appear Test complete Clearing on page 1 If code 23 appears This page left blank intentionally Component Code SID 6, FMI Speed Input Error Code 24 SID 6, FMI 2 Speed Input Error Unit 32-way connector Have pins in C10 and C11If vehicle uses J-1939 or 1587 conﬁguration Between speed sensor Pins a and B 10K ohms or open circuitOhms Clearing on page 1 If code 24 appears Component Code 25 SID 231, FMI 2, 12 Cruise Signal Error TerminatingResistor Way pin D7 and ground If resistance is outside of range Go to Step B See 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. Repair If 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 errors If 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 B If any of the above conditions are not met Go to Step C Connector pin D5 Driver Display Step D On page 1 Clearing on page 1 If code 33 appears Symptom Isolation Procedures Antenna Not Detecting Targets Appropriate isolation Properly Go to Step a Procedure Side Sensor Not Detecting Targets Side Sensor Detection Test Between pins 2 Key on Measure voltageGo to Step D If voltage is outside of range Measure resistance between Way pin C16 4-way pinWay pin C16 Ground Replace Side Sensor Display. Go to Step Go to Step E Key off Measure resistance between Way pin C14 Way pin C14 GroundGo to Step Go to Step F Key off Measure resistance between Way pin C12 Way pin C12 GroundGround is more than If resistance is outside Step Detection Test There is no fallback mode for this symptom Driver Card Not ReadingNew Driver Card Driver Card Detection Test Bendix Vorad System Wiring Diagram Appendix Wiring Diagram Eatonvorad Fault Code Tree Nvram