Pontiac Fiero 1988 Service Manual page 1103

(Continued from previous page)
B: LO BEAMS ON BOTH SIDES ARE
INOPERATIVE OR HI BEAMS AND HI
BEAM INDICATOR ARE
INOPERATIVE
Connect: TEST LAMP
A t : HEADLIGHT DIMMER SWITCH
CONNECTOR (Connected)
Conditions:
• Light Switch: HEAD
• Dimmer Switch: LO
Connect
Between
Correct Result For Diagnosis
(YEL) &
Ground
Test Lamp
lights
Seel
(TAN) &
Ground
Test Lamp
lights
See 2
® Dimmer Switch: HI
(LT GRN)&
Ground
Test Lamp
lights
See 2
© If all results are correct, check wiring to
lights for an open.
1. Check YEL (10) wire for an open.
2. Replace Headlight Dimmer Switch.
CIRCUIT OPERATION
Voltage is applied to the Light Switch at all
times. The Light Switch includes a self-reset-
ting Circuit Breaker. The Circuit Breaker opens
when the Headlight circuit draws too much cur-
rent. When the Circuit Breaker opens, it inter-
rupts the current flow. With no current flow,
the Circuit Breaker cools off and resets auto-
matically. When the Light Switch is in HEAD,
the Headlight Dimmer Switch directs voltage
to either the Lo Beams or the Hi Beams. The Hi
Beam Indicator also receives voltage along
with the Hi Beams.