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8-70
1977 PONTIAC SERVICE MANUAL
Replace defective cancelling cam or
direction signal switch.
All Inoperative
CAUSE
CORRECTION
Stop-hazard fuse blown.
Stop-switch misadjusted or
defective.
Replace. If new fuse blows, repair short
to ground in circuit between fuse and lamps.
With test bulb check voltage with brake
pedal depressed at white wire terminal
in steering column connector. If bulb
does not light, check stop switch for
proper adjustment. If adjustment is OK,
replace stop switch.
Will Not Turn Off
CAUSE
CORRECTION
Stop switch misadjusted or defective.
Readjust properly. If switch still
malfunctions, replace.
ON-CAR SERVICE
REMOVE AND REPLACE
Headlamps
-
The headlamp assembly can be replaced
from the front of the vehicle by removing trim rings or bezels,
releasing retaining spring, twisting assembly to remove, and
disconnecting wiring harness connector. Refer to Section 2C,
Chassis Sheet Metal, for further details. Headlamps should
be aimed after replacement.
To replace only the headlamp bulb, remove outer trim
ring or bezel, then remove the outer retaining ring around the
bulb. Pull the bulb out and disconnect the wiring. Connect
the wiring to the new bulb, replace in the housing, replace
the retaining ring insuring that the bulb seats properly in the
housing, and replace the outer bezel.
All Other Front Bulbs
-
Bulbs at the front of the car
can normally be replaced from beneath the car. Some bulbs
may require removal of the outer lens to replace. Remove the
socket from the bulb housing by twisting. Then replace the
bulb, and reinstall the socket. Check the system for proper
operation. Refer to Section 2C for lamp housing removal and
replacement.
Rear Bulbs
-
Information on rear bulbs and housings
is contained in the Body Service Manual. All bulbs except B
Series and A Series Station Wagon can be reached inside the
rear compartment. B Series and A Series Wagon can be
replaced from beneath the rear bumper.
SEAT BELT WARNING SYSTEM
GENERAL DESCRIPTION
The seat belt warning system on all 1977 cars is the
"8-SECOND-0N"system.
This system will activate a warning light and buzzer for
approximately 8 seconds when the ignition key is turned to
the "0N"position if the driver's seat belt is not buckled.
NOTE: Rapid cycling of the system will result in a decrease
in the time period.
The light and buzzer with timer sequence of operation
is as follows:
1. "DRIVER'S BELT UNFASTENED" Turn ignition
switch "ONw- light and buzzer both come on for
approximately 8 seconds, then go off and stay off. If belt
buckle is fastened prior to 8 second turn-off time, buzzer will
go off and light stays on for balance of 8 second delay time.
2. "DRIVER'S BELT FASTENED". Turn ignition
switch "ON7'- light comes on; buzzer does not. At end of
approximately 8 seconds, light goes off and stays off. If buckle
is unfastened prior to 8 second turn-off time, buzzer and light
both stay on for balance of 8 second delay time.
NOTE: Light always comes on for full 8 second time,
while the buzzer is controlled by the driver's seat belt
buckle switch on B, H aild HM Series, and by the
retractor switch on all others. Light is controlled only
by ignition switch and timer.
DIAGNOSIS
See Figure 8-90 for the seat belt system diagnosis.
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