Mazda MX-5 1990 Workshop Manual page 699

Note
AUDIO
Symptom: Speaker(s) do not operate
(With headrest speakers.)
T
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• Before troubleshooting, verify that the customer is using the audio system correctly.
If not, advise or instruct him/her in the proper operating procedure. (Refer to page T -110.)
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05UOTX-258
Step 1
Check if the anti-theft system has been activated. Turn the ig-
nition switch to ACC and note the display.
Display Action
CODE flashes
Deactive anti-theft system
(Refer to page T -114.)
Note
If CODE appears when ignition switch is
turned to ACe from OFF go to Step 2.
Err flashes Have audio unit changed at a Panasonic serv-
ice company
--
Clock
Go to Step 4
No indication Go to Step 2
Step 2
1 . Remove the audio unit. (Refer to page T -126.)
2. Check the connections of the ground wire and the short
plug.
3. If a connection is poor or loose, repair or replace it.
4. If the connections are OK, go to Step 3.
Step 3
1. Turn the ignition switch to ACC.
2. Measure the voltage at the following terminal-wires of the
audio unit connector.
Wire Voltage
Action
12V Next, check wire (LlR)
(LIB)
Check CIGAR 15A fuse
OV If CIGAR 15A fuse OK, repair wiring harness
(CIGAR 15A fuse - Audio unit)
12V
Replace audio unit
(UR)
Check ROOM 10A fuse
OV
If ROOM 10A fuse OK, repair wiring harness
(ROOM 10A fuse - Audio unit)
Step 4
Locate the faulty speaker(s) by using the heatrest speaker vol-
ume, and balance control.
1. Turn the ignition switch to ACC.
2. Playa prerecorded tape, and set the volume to the center
position.
3. Set the head restraint speaker volume, and balance con-
trols as shown in Table 2 (page T -118). Check operation
of each speaker.
4. From results of Table 2 testing, go to the next step.
T-117