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Trouble Diagnoses
NAEL0346
AUDIO UNIT
NAEL0346S01
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. 10, located in fuse block (J/B)].
Turn ignition switch ON and verify that battery posi-
tive 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. 4, located in fuse block (J/B)]
and verify that battery positive voltage is present at
terminal 6 of audio unit.
2. Remove audio unit for repair.
AM stations are weak or
noisy (FM stations OK).
1. Antenna
2. Poor audio unit ground
3. Audio unit
1. Check antenna.
2. Check audio unit ground.
3. Remove audio unit for repair.
FM stations are weak or
noisy (AM stations OK).
1. Window antenna
2. Audio unit
1. Check window antenna.
2. Remove audio unit for repair.
Audio unit generates noise
in AM and FM modes with
engine running.
1. Poor audio unit ground
2. Loose or missing ground bonding
straps
3. Ignition condenser or rear window
defogger noise suppressor condenser
4. Alternator
5. Ignition coil or secondary wiring
6. Audio unit
1. Check audio unit ground.
2. Check ground bonding straps.
3. Replace ignition condenser or rear window defogger
noise suppressor condenser.
4. Check alternator.
5. Check ignition coil and secondary wiring.
6. 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 ground
2. Antenna
3. Accessory ground
4. Faulty accessory
1. Check audio unit ground.
2. Check antenna.
3. Check accessory ground.
4. Replace accessory.
BASE SYSTEM
NAEL0346S02
Symptom Possible causes Repair order
Individual speaker is noisy
or inoperative.
1. Speaker
2. Audio unit output
3. Speaker circuit
4. Audio unit
1. Check speaker.
2. Check audio unit output voltages.
3. Check wires for open or short between audio unit
and speaker.
4. Remove audio unit for repair.
BOSE SYSTEM
NAEL0346S03
Symptom Possible causes Repair order
Audio unit controls are
operational, but no sound
is heard from any speaker.
1. 15A fuse
2. Audio unit output
3. Audio unit
1. Check 15A fuse [No. 4, located in fuse block (J/B)].
Verify battery positive voltage is present at terminal 2
of audio amp. relay.
2. Check audio unit output voltage (Terminal 12).
3. Remove audio unit for repair.
All front speakers are inop-
erative.
1. Audio amp. relay
2. Audio amp. relay ground
3. Amp. ON signal
1. Check audio amp. relay.
2. Check audio amp. relay ground (Terminal 3).
3. Turn ignition switch ACC and audio unit ON. Verify
battery positive voltage is present at terminal 1 of
audio amp. relay.
Individual front speaker is
noisy or inoperative.
1. Speaker ground
2. Power supply
3. Audio unit output
4. Speaker
1. Check speaker ground (Terminal 5).
2. Check power supply for speaker (Terminal 4).
3. Check audio unit output voltage for speaker.
4. Replace speaker.
GI
MA
EM
LC
EC
FE
CL
MT
AT
TF
PD
AX
SU
BR
ST
RS
BT
HA
SC
IDX
AUDIO
Trouble Diagnoses
EL-195
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