1992 MAZDA PROTEGE radio

AUDIO
No sound
Replace fuse Va: Battery voltage
Verify that short plug is connected tightly to DIN
connector Connect tightly
I YES
Verify battery voltage at terminals of harness side with
Accp;;;ia, ,:---lb, “‘-k,
I YES
Replace radio
I
23UOTX-064 Sound is partial
1 Table 1
I Speaker Fader Balance
I Speaker
operates
I Judgement
Left rear Rear I Left Yes 1 Left rear speaker OK
No 1 Left rear soeaker circuit faulty (Go to Table 2)
Right rear Rear
I Right Yes Right rear speaker OK
No 1 Riaht rear sneaker circuit fauftv (Go to Table 2)
I
Left door
Right door
Table 2
Rear
Rear Left
Right Yes
No
Yes
No Left door speaker OK
Left door speaker circuit faulty (Go to Table 2)
Right door speaker OK
Right door speaker circuit faulty (Go to Table 2)
I No operation
I Action
I
1 Anv sneaker 1 Insoect the speaker (Refer to page T-99)
I
All speakers Replace the audio component
I
23UOTX.065
T-93

I
AUDIO
Bad sound quallty of radio
I
Is sound quality bad in certai
NO FM multipath interference and excessively strong AM
reception near station may cause bad sound
I
Is tuning OK?
I Normal t
Check for objects lying on speaker and rattling
I Repair speaker
1 OK
Check speakers (Refer to pa Replace speakers
1 OK
Is antenna properly installed?
I Install properly NO
Check antenna (Refer to page T-100) - Replace antenna L I L I OK
Replace audio assembly
23UOTX-066
II Bad sound quality of tape
II
Check with another tape Defective tape Use good tape
1 NG
Check speakers (Refer to page T-99)
I
Check for objects lying on speaker and rattling OK
I
I
Replace audio combination assembly
23UOTX.067
T-94

AUDIO
CAUSES OF NOISE
When the radio receives a signal from a station, there may be some noise interference. The cause could be
1. Defective audio system.
2. The vehicle itself inducts noise (called outside noise).
3. Noise from other cars or neon signs, for example, ambience noise.
Since ambience noise is a temporary occurrence, this section does not deal with it. For noise problems,
first, the cause of the noise must be determined through the troubleshooting guide. Once it has been deter-
mined, refer to the suppression chart to find the proper procedure for eliminating the noise.
FM STATION
93u15x-07 1 03UOTX-187
FM multipath
FM waves can cause a problem called multipath receiving.
This happens when the radio picks up a direct wave and
reflected wave at the same time. This results in a “Dead Spot”
or distorted sound.
Troubleshooting
I I
+
There is still noise
I
Defective audio system
+
Noise eliminated
V
Vehicle itself inducts noise
I
23UOTX-070
T-96

AUDIO T
Noise Suppression Chart
Cause
‘uel pump noise Remedy Move speaker wiring away from fuel pump wire.
REAR HARNESS FUEL
PUMP
Wotor noise
Wiper, washer, power
window, for example) 1. Check grounding.
2. Install condensers to motor circuit.
Turn signal noise Connect condenser (0.5 pF) to power line of filter unit. Note
CONDENSER
4lternator noise
l Condenser should be placed near flasher unit.
Connect condenser (0.5 pF) near alternator.
TO RADIO
CONDENSER
97UOTX-1
T-97

Z-Gl-4 Reading Wiring Diagrams
System circuit diagram/connector diagram
l These show the circuits for each system, from the power supply to the ground. The power supply side
is on the upper part of the page, the ground side on the lower part. The diagrams describe circuits with
the ignition switch off.
Below is an explanation of the various points in the diagram.
) Indicates operating conditions for switches.
The prefix letter indicates the system in which
:he connector is used.
JB: Joint box connections
X : Common connectors
A : Charging system/starting system
connectors
B : Engine control system connectors
C : Gauge control system connectors
D : Wiper system connectors
E : Lighting system connectors
F : Signal system connectors
G : Air-conditioning system connectors
H : Transmission control system
connectors
I : Interior lamp system connectors
J : Audio/radio connectors
K : Power window/power door lock system
connectors
L : Remote control mirror system
connectors
M : Sliding sunroof system connectors
N : Power steering/4-wheel steering
system connectors
0 : Anti-lock brake system connectors
P : Power seat/seat heater system
connectors
Cl : Auto cruise control system connectors
R : Auto adjusting suspension system
connectors
S : Passive shoulder belt control/air bag
system connectors
T : Others
Y : Ground connector
- .
1

\\‘
IGNITION SYSTEM l ENGINE CONTROL 9 harness ground is represented differently
:han a unit ground.
Types of grounds Symbol
Harness
I
-
-
-
-
‘“G:
si-
P
7:’
.I
I
I
.i
-
-
-
f
9
Tiii
zs
LL
Y
a
EE
-

Z-GI-10 Reading Wiring Diagrams
Logic symbols
‘ypes of logic symbols Operation Expressing output Simple relay circuits
OR Input to A or 6 will Low electrical potential (L) at A and B --,
produce output at C No output (L) at C
High electrical potential (H) at A or B -+ A
A
ID- C Output (H) at C
EB Q-f2 c
B B
AND Input to A and B will High electrical potential (H) at A and B -+
produce output at C Output (H) at C
A _
A
El-- Low electrical potential (L) at A or B -+
B C
No output (L) at C
B
II!I3 Q-00-Q
C
INV No input to A will produce Low electrical potential (L) at A +
an output at B
Ungrounds (H) B
-b- Input to A will not produce High electrical potential (H) at A +
A B
any output at B Grounds (L) B A-
El
PROCESS Simplified representation of complex functions within circuit Describes (Examples)
main function
Breakerless transistor
---
-I- 1 1 Signal detector for emission control unit, cooling unit and
I igniters
- ~._..._...._._..._._..__,
--L--A tachometer
P.Signal converter for turn and hazard flasher unit,breakerless : siinalcon”elter :
i..-.--...-.........---i
transistor igniter unit, etc. --j CoIlsignal ConVerted e
--I. .‘p. Y?YT?!!9’. . _ i
Abbreviations used in this booklet
A
%J Ampere
Auto Stop
Air Supply Valve
A/C AAS
Air Conditioner Auto Adjusting Suspension
A/F Air Fuel ABS
AIR Anti-lock Brake System
Auto Reverse
A/T ACV
Automatic Transmission
ACC Air Control Vafve
Acc%K4tIory
ACCEL Accelerator
ADD AE
Additional Acoustic Equilibration
ALT Alternator
EP AIS
Amplitude Modulation Air Injection System
Amplifier ALL
ANT Antenna Automatic Load Levelino
ATP Atmospheric Pressure
ATX Automatic Tmnsaxle FR Fmnt Right ELI?
FIB Feedback
F/I Fuel Injector Emergency Locking Retractor
EN ELEC Electric
Frequency Modulation
Generator
HEI Electronic Tuner
Hiih Energy lgnitiin
HID K!
Heat/Defmster
HEAT Heater Exhaust
HI Hiih F
ISC Front
Idk Speed Contml
IG Ignition
ILLUMI Illumination FICB
INT Intermittent FL Fast Idle Cam Breaker
Fmnt Left
JB
LH Joint Box
Left Hand
:AC Battery
Bypass Air Control Valve
B/L Ei-Level
CPU Central Pmcessing Unit
CSD COM start Device
CARB Carburator
CCT Circuit
CIGAR Cigarette
COMBI Combination
CON Conditioner
CONT Control
DOHC Double Overhead Camshaft
DEF Defroster
ECPS Electronicalfy Controlfed Power
Steering
EGI Electronic Gasoline Injection
EGR Exhaust Gas Recirculation LCD Liquid Crystal Display
:i Low
Low Wave
/IL Motor
MaWunction Indicator Lamp
MTR Mechanical Tuning Radio
Mrr Manual Transmission
MID Mkfdk,
MIN Minute
MIX
MiXtUt MPX Mukiplex
MTX Manual Transaxte
K Middle Wave
Normalty Closed
too Normally Open
Over Drive
OFF Switch Off ON
FRCV
PTC
P/S
PRG
ass
ii:
RPM
EC
SOL
ST
Et TCV
TICS
TEMP
ES
V
VRIS
VENT
VOL
W Switch On
Power
Pressure Regulator Control
Solenoid Valve
Positiie Temperature
Coefficiint Heater
Power Steering
Purge Solenoid Vahe
Quick Start System
Rear
Riiht Hand
Rear Left
Revolution Per Minute
Rear Right
Recirculation
Solenoid
Start
Short Wave
Switch
~;eScml Turbocharger Solenoid
Triple Induction Control System
Temperature
Transistor
Total Wiring System
volt
Variable Resonance Induction
System
Ventilation
Volume
Wan

: WIRINQ DIAQRAM
m AUDIO SYSTEM
O...WITH POWER WINDOW
1 J
B (F)
RADIO
15A
,I
\ I
JB-02
AUDIO ILLUMINATION LAMP:
REFER TO SECTION I-4
:J-01
AUDIO SYSTEM
J-01 AUDIO SYSTEM (I)
0 v R/B L/R L/B
w L/O * * ++ * *
J-03 DOOR SPEAK:$$ J-04 DOOR SPEAKER RH
< J-02 AUDIO SYSTEM (I)
* * W/L
x.
L L/W
* B/L
J-05 REAR;SPEAKER(k; J-06 REAR SPEAKER I+
(R)
Z-80

I . . ..I.. VW I.-.- . . . . m
l POWER OUTSIDE MIRROR
L
RADIO
POWER OUTSIDE MIRROR SWITCH
_--------_------____
-RIGHT
-DOWN
MIRROR MOTOR