Pontiac FIREBIRD 1972 Service Manual page 1275

CHASSIS ELECTRICAL
H O R N D I A G N O S I S
RELAY CLICKS
'-4
RELAY DOES
NOT CL l CK
1. Remove green wire
connector from relay.
2. Ground one lead of 12
w l t test light and touch
the other lead to green
wire terminal on relay.
Ground one lead to a 12 volt test
light and touch theother lead to
LAMP ON
Lr'
LAMP OFF,
9
LAMP OFF
1. Connect green wire connector.
2. Touch test light lead to wire
i n connector at horn.
3. Push horn button.
Touch test light lead to black wire
LAMP ON
C;3
LAMP OFF
G '
1. Check for dirty contact at
connector on relay.
2. Repair open circuit i n
wire from relay to t u r n
Remove horn button pad or
cup and touch test light lead
to horn contact assembly.
1
wire from relay
GROUND 0. K.
+
POOR GROUND
+
LAMP OFF
0
LAMP ON
Q
Replace horns Repair ground
Check for broken ground strap at
steering column coupling flange.
Repair open i n wire from
t u r n signal connector to
horn contact.
BROKEN
6
I
HORNS BLOW CONTINUOUSLY
1
wires from horn contacts
I
Disconnect black wire
from horn relay.
I
Replace coupling
L E I
HORNS CONTINUE
HORNS STOP
BLOW I NG
2. Connect 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.
Repair or replace grounded
horn contacts or wire i n
Repair grounded wire
from t u r n signal con-
- -
F i g .
12-2
H o r n D i a g n o s i s