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Nissan-Datsun
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2010
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Altima V6-3.5L (VQ35DE)
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Repair and Diagnosis
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A L L Diagnostic Trouble Codes ( DTC )
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Testing and Inspection
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U Code Charts
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U121B
U121B
U121B AV CONTROL UNIT
DTC Logic
Diagnosis Procedure
1.CHECK MUSIC BOX FUNCTION
Is music box function normal?
YES - Malfunction may be detected intermittently.
NO - Replace AV control unit. Refer to
AV Control Unit
.