Pontiac FIREBIRD 1972 Service Manual page 1277

CHASSIS ELECTRICAL 12-7
Fig. 12-7 Adjusting "No Light" Position
If positive contact is still not established, replace the
lock cylinder.
6. Signal Switch wiring Check
-
If, when checking the
continuity of the buzzer switch the first time, contact
was established, a jumper wire should be secured to
the male
" E
and "F" contacts of the harmonica
(mounted on steering column). Check the buzzer
switch contact pads with the continuity meter (Fig.
12-8).
CONTINUOUS IGNITION
CHASSIS CHECK
Should the buzzer continue to operate with the key in the
lock cylinder and the door either opened or closed, but
would cease when the key is removed, the door jamb
switch should be adjusted or possibly replaced.
COLUMN CHECK
If the buzzer sounds after the key has been removed from
the lock cylinder with the driver' door open, and ceases
when it is closed, the apparent fault is either in the buzzer
switch or the lock cylinder. To verify, disconnect the har-
momica and check the continuity of the "Em and "F" male
contacts with the key removed from the lock cylinder. If
contact is established, the fault is in the switch or lock
cylinder.
Fig.
12-8
Continuity of Buzzer Switch Contacts
If no contact is established during this check, inspect
for loose connections, frayed wires, etc. As a last
resort, replace the signal switch.
Buzzer Switch to Signal Switch Contact Check
-
If,
during the initial continuity checks, both the switch
and pad checks are positive, the indication is that
poor or no contact is being made between the buzzer
terminals and the switch pads. The switch may either
be replaced or the terminals rebent to regain positive
contact. If the switch is replaced, it is recommended
that it be set to the minimum contact gap to insure
reliable function.
KEY BUZZER OPERATION
Disassemble the column to the point where the buzzer
switch and lock cylinder can be removed. Remove both
and visually inspect. Also, check the lock cylinder bore for
chips, etc. If the buzzer switch is damaged, replace it. If
it is not, reset the contact gap opening, using the gage and
procedure described previously.
Check the lock cylinder for positive plunger actuation.
The plunger should retract with little effort when the key
is removed from the lock cylinder. If it sticks or is difficult
to retract, replace the lock cylinder.
With the switch reset and the lock cylinder checked, re-
place both and recheck the function using the continuity
light. (Probes on buzzer leads inserting and removing key
in lock cylinder.) If function is now correct, reassemble
the column.
TURN SIGNAL SYSTEM DIAGNOSIS
When a complaint is made involving the turn signal sys-
more of these should be repaired or replaced. If electrical,
tem, it must first be determined whether the problem is it must be determined whether the switch or the chassis
mechanical or electrical. If mechanical, the switch, col-
wiring is in need of repair or replacement.
umn casting, or cancel cam may be the cause, and one or