Horn Does Not Sound - Mazda MX-5 1990 Workshop Manual

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TROUBLESHOOTING
HORN
T
Symptom: Horn does not sound.
05UOTX·191
Step 1
1 . Check the STOP 15A fuse.
2. If the fuse is burned, replace it. Check and repair the wire
harness, if necessary.
3. If the fuse is OK, go to Step 2.
Step 2
1. Disconnect the horn connector.
2. Apply 12V to the horn, and check if the horn sounds.
3. If the horn sounds, go to Step 3.
4. If the horn does not sound, replace the horn.
Step 3
1 . Remove the knee protector.
2. Ground the terminal wire (G/O) of the horn relay connector.
3. If the horn sounds, go to Step 4.
4. If the horn does not sound, go to Step 6.
Step 4
U.S. spec.
Warning
• Before removal of the air bag module, the negative
battery cable must be disconnected to prevent ac-
cidentaly deployment.
1. Remove the air bag module. (Refer to page T -150.)
2. Check continuity between the terminal of the horn switch
connector and the steering shaft.
Horn switch
Continuity
ON
Yes
OFF
No
3. If not as specified, replace the horn switch and steering
wheel as an assembly.
4. If correct, go to Step 5.
Warning
• After installing of the air bag module, verify that the
air bag system is operating normally by monitoring
the air bag warning lamp. (Refer to page T
-138.)
T-93

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