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Home >> Nissan-Datsun >> 2002 >> Sentra SE-R, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 1215 (Audio System) >> Audio >> Trouble Diagnoses >> Audio Unit
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Audio Unit

WARNING: This page is about a different car, the 2004 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.
TROUBLE DIAGNOSES

Symptom Possible causes Repair order
Audio unit inoperative (no digital display and no sound from speakers).
  1. 10A fuse
  2. Poor audio unit case ground
  3. Audio unit
  1. Check 10A fuse [No. 1, located in fuse block (J/B)]. Turn ignition switch ON and verify that battery positive voltage is present at terminal 10 of audio unit.
  2. Check audio unit case ground.
  3. Remove audio unit for repair.
Audio unit presets are lost when ignition switch is turned OFF.
  1. 15A fuse
  2. Audio unit
  1. Check 15A fuse [No. 32, located in fuse and fusible link box] and verify that battery positive voltage is present at terminal 6 of audio unit.
  2. Remove audio unit for repair.
AM/FM stations are weak or noisy.
  1. Antenna
  2. Poor audio unit case ground
  3. Audio unit
  1. Check antenna.
  2. Check audio unit case ground.
  3. Remove audio unit for repair.
Audio unit generates noise in AM and FM modes with engine running.
  1. Poor audio unit case ground
  2. Loose or missing ground bonding straps
  3. Ignition condenser or rear window defogger noise suppressor condenser
  4. Ignition coil(s)
  5. Audio unit
  1. Check audio unit case ground.
  2. Check ground bonding straps.
  3. Replace ignition condenser or rear window defogger noise suppressor condenser.
  4. Check ignition coil(s).
  5. Remove audio unit for repair.
Audio unit generates noise in AM and FM modes with accessories on (switch pops and motor noise).
  1. Poor audio unit case ground
  2. Antenna
  3. Accessory ground
  4. Faulty accessory
  1. Check audio unit case ground.
  2. Check antenna.
  3. Check accessory ground.
  4. Replace accessory.