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.
• Code41,FMI4-RHSpeakercircuitisshortedtoground
• Code41,FMI5-RHSpeakercircuitisopen
• Code42,FMI4-LHSpeakercircuitisshortedtoground
• Code42,FMI5-LHSpeakercircuitisopen
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,oropenexternalspeakerconnections
• Pinchedwireorshortedexternalspeaker
• Externalspeakercongurationenabledwithoutexternalspeakerconnected
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.
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