Bendix Commercial Vehicle Systems VORAD VS-400 INSTALLATION NOTES - Manual (Page 31)

General Information
29
Diagnostic Trouble Code (DTC)
Isolation Procedures
Component Code: 41, 42
(SPN 1703, 1704, FMI 4, 5)
Driver Interface Unit External Speaker Diagnostic Trouble Code (DTC)
Overview
Most vehicles use the DIU as a source of audio alerts, however, the chassis manufacturer has the option to install an external chassis
speaker system . For systems with external speaker systems, this code indicates that the VS-400 Driver Interface Unit (DIU) has detected
that the external speaker circuit has an open circuit or short to ground .
Diagnostic Trouble Code (DTC) Detection
If the DIU is enabled for external speakers and the speaker circuit becomes open or shorted to ground this code is set active .
• Code 41, FMI 4 - RH Speaker circuit is shorted to ground
• Code 41, FMI 5 - RH Speaker circuit is open
• Code 42, FMI 4 - LH Speaker circuit is shorted to ground
• Code 42, FMI 5 - LH Speaker circuit is open
Symptom
When this code is active, the Bendix ™ VORAD ® VS-400 system will not operate and the orange DTC fail light on the DIU will be illuminated .
If SmartCruise ® adaptive cruise control is enabled and the engine is enabled for adaptive cruise, the vehicle’s cruise control may not
operate .
Possible Causes
• Loose, corroded, or open external speaker connections
• Pinched wire or shorted external speaker
• External speaker configuration enabled without external speaker connected
Repair Procedure
Active Diagnostic Trouble Code Steps to Perform
Code 41, FMI 4 1 . Check for a short to ground by measuring the resistance between Pin-1 and
Pin-5 of the DIU harness connector .
a . If value is less than 2 ohms, test failed . Check external speaker and
harness for short to ground . Repair as needed .
b . If value is 2 to 5 ohms, continue to next step .
2 . Replace DIU and verify Diagnostic Trouble Code (DTC) condition has cleared .
3 . Test Complete .