Pontiac FIREBIRD 1972 Service Manual page 1278

12-8 1972 PONTIAC SERVICE MANUAL
The wiring diagram, found at the end of this section,
should be used to trouble shoot the chassis and body
wiring.
The nature of the customer complaint will generally point
to the problem area. Should it refer to the operation of the
turn signal lever, not cancelling from a turn, or not return-
ing from lane change, it is possible that the switch is
mounted loosely or off center.
Should lamps not light or flash or if one part of the system
itself is out, the problem would appear to be electrical and
could be caused by faulty chassis wiring, a partially inop-
erative turn signal switch, burned out lamps, flashers or
fuses.
ELECTRICAL CHECK
The most common turn signal system problems are gener-
ally electrical and may easily be fixed by the replacement
of fuses, lamps, or flashers.
First make these checks and replace any non-operative
components.
1. Check fuses. (Figure 12-9) Replace if blown. If new
fuse blows, replace flasher in system. (There are two
(2) flashers in the signal switch system. The hazard
warning flasher is located on the fuse board, while the
turn signal flasher is up under the instrument panel
adjacent to the column).
2. Check for secure connection at the chassis switch
connector. This is the harmonica connector on the
column. (Figure 12-10) Secure if loose. Check all
individual wire terminals for proper seating in the
connector bodies. Terminals should be locked in
place.
3. Depress haiard warning button and check all lights
in signal switch system. Replace any which do not
Fig. 1 2 - 1 0 Check Harmonica Connector on Column
work. If all lamps light when hazard warning is de-
pressed, but flashing does not occur, replace hazard
warning flasher. (On fuse block, Figure 12-1 1)
4. If all directional lamps on the indicated side light
when lane change or turn indicator is actuated, but
no flashing occurs, replace the turn signal flasher.
This flasher is located under the instrument panel
near the steering column.
The above four steps will, in most cases, cure the common
signal switch system troubles. If the system is still not
operating correctly, determine whether the chassis wiring
or the signal switch itself is at fault.
Electrical Check of the Turn Signal Switch
To check the electrical function of the switch in the vehi-
cle, a continuity checker is required.
1.
Disconnect the chassis to column connector.
Fig. 12-9 Check Fuses in Fuse Block
Fig. 12-1 1 Check Hazard Warning Flasher