Pontiac Fiero 1988 Service Manual page 1107

HEADLIGHT D O T
Continued from previous page)
C(WHT)&
Ground
Test Lamp
lights
See 2
C(WHT)&D
(BLK)
Test Lamp
lights
See 3
• Light Switch: HEAD
A (YEL) &
Ground
Test Lamp
lights
See 4
• If all results are correct, replace Head-
light Door Module.
1. Check Fusible Link C or D and RED (2)
wire for an open (see schematic).
2. Check TAIL Fuse, Light Switch, and
WHT (103) wire for an open (see sche-
matic).
3. Check BLK (150) wire for an open.
4. Refer to Headlights, Section 8A-100.
B: LH H E A D L I G H T DOOR D O E S NOT
O P E R A T E P R O P E R L Y
1. Check for mechanical binding.
2. Remove connector C2 from the Headlight
Door Module. (Leave CI connected.) Con-
nect fused jumpers from terminal A (GRY/
BLK) of connector C2 to terminal C of the
Module, and from terminal B (LT GRY/
BLK) of the connector to terminal D of the
Module. Operate the Headlights.
• If the LH Headlight Door works,
replace the Headlight Door Module.
• If LH Headlight Door does not work,
check wiring to the motor. Replace the
motor if the wiring is OK.
C : RH H E A D L I G H T DOOR D O E S NOT
O P E R A T E P R O P E R L Y
1. Check for mechanical binding.
2. Remove connector C2 from the Headlight
Door Module. (Leave CI connected.) Con-
nect fused jumpers from terminal C (DK
GRN) of connector C2 to terminal A of the
Module, and from terminal D (GRY) of the
connector to terminal B of the Module. Oper-
ate the Headlights.
• If RH Headlight Door works, replace the
Headlight Door Module.
• If RH Headlight Door does not work,
check wiring to the motor. Replace the
motor if the wiring is OK.
CIRCUIT OPERATION
Voltage to open the Headlight Doors and to
power the Solid State circuitry is applied at all
times to the Headlight Door Module at termi-
nals B and E of connector CI. With the Light
Switch in OFF, voltage to close the Headlight
Doors is applied to terminal C of connector CI.
With the Light Switch in HEAD, voltage to
energize the Relay coil is applied to terminal A
of connector CI.
When the Light Switch is moved to HEAD,
voltage is applied to the Headlight Door
Motors through the relay contacts in the OPEN
position. Ground is provided for the motors
through the Solid State circuitry until the
Headlight Doors are open.
When the Light Switch is moved to OFF,
voltage is reversed across the Headlight Door
Motors and the motors run in the opposite
direction to close the Headlight Doors. When
the Headlight Doors are closed, the Solid State
circuitry senses that the motors are not operat-
ing and ground is removed.