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1977 PONTIAC SERVICE MANUAL
HORN DIAGNOSIS
I
HORNS INOPERATIVE
1
.
i
RELAY CLICKS
Lr'
RELAY DOES
NOT CLICK
I
1. Remove green wire
connector from relay.
2. Ground one lead of 12
volt test light and touch
the other lead to green
wire terminal on relay.
Push horn button.
Ground one lead to a 12 volt test
light and touch the other lead to
LAMP ON
Replace relay
I
1. Connect green wire connector.
2. Touch test light lead to wire
i n connector at horn.
3. Push horn button.
LAMP OFF
a
LAMP ON
P
1 . Check for dirty contact at
connector on relay.
2. Repalr open clrcult In
wlre from relay to turn
slgnal connector.
Remove horn button pad or
cup and touch test llght lead
wire from relay
LAMP ON
0
LAMP OFF
0
Repalr open In wlre from
turn signal connector to
horn contact.
I
I
Replace horns
I
I ~ e p a i r ground]
HORNS BLOW CONTINUOUSLY
F
OKAY
'
b
BROKEN
+
Disconnect black wire
Repair poor ground at
Replace coupllng
wires from horn contads
to horn buttons or rim.
HORNS CONTINUE
HORNS STOP
I
Replace relay
]
1
1. Disconnect turn signal connector.
2. Conned a test light to a 12 volt
source.
3. Touch test light lead to black wire
terminal i n turn signal switch
side of connector.
I
LAMP ON
LAMP OFF
-
horn contacts or wire i n
from turn signal con-
Fig. 8-86 Horn Diagnosis
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