Pontiac Fiero 1988 Service Manual page 959

POWER DISTRIBUTION
CIRCUIT OPERATION
Electrical power for the car Is provided by the
Generator when the engine is running. The
schematic diagram shows how each circuit gets
Its power. For more detail about the Generator,
and connections to the Battery and Starter, see
the Starter and Charging System, Section
8A-30.
The car's Power Distribution System con-
sists of Fusible Links, Fuses, Circuit Breakers,
the Light Switch, and the Ignition Switch.
Fusible Links are short pieces of wire several
sizes smaller than the circuit wire to which they
supply power. They are covered with a special
high-temperature Insulation. When conducting
too high a current, they will melt and stop cur-
rent flow. They are designed to protect the car's
electrical system from electrical shorts where it
Is not protected by the Circuit Breakers and
Fuses. See Fuse Block Details for complete dis-
tribution of power from each fuse to its indi-
vidual components.
The Ignition Switch has six positions, five of
which have detents. The detented positions are
ACCY, LOCK, OFF, BUN and STAHT. The
BULB TEST position is after the RUN position
and just before the START position and does
not have a detent.
Individual schematics show their Fuses
suplied from a heading such as HOT IN RUN,
corresponding to the Ignition Switch position
in which power is supplied to the circuit.
C O M P O N E N T LOCATION Page-Figure
A/C Power Relay Front compartment, on RH side of heater-A/C
module 201-11-B
Battery Junction Block RH front of engine compartment, near battery .. 201- 4-A
Cold Start Injector Top of engine, on throttle body
Cold Start Switch Top RH side of engine, on Intake manifold 201- 3-C
Coolant Fan Relay. LH front corner of front compartment 201- 3-D
Cruise Brake Switch On brake pedal support 201-11-A
Direct Ignition System (DIS)... Top rear of engine. 201- 2-B
Electro-Hydraulic Power Steering
(EHPS) Controller Lower LH side of front compartment 201- 3-D
Electronic Control Module (ECM)... Between seats, on front of rear bulkhead 201- 5-B
201- 5-D
201- 6-D
4-A
4-A
-10-C
201- 4-A
Fuel Pump Relay Engine compartment, LH side of rear bulkhead
Fuse Block Behind LH side of I/P
Fusible Link A RH front of engine compartment, at Battery
Junction Block 201-
Fusible Link B RH front of engine compartment, at Battery
Junction Block 201-
Fusible Link C. In forward lamp harness, right of brake master
cylinder. 201-
Fusible Link D In forward lamp harness, right of brake master
cylinder 201-10-C
Fusible Link E RH front of engine compartment, at Battery
Junction Block
Fusible Link F RH front of engine compartment, at Battery
Junction Block
Fusible Link G Lower LH front of engine, at Starter Solenoid..
Fusible Link H Engine compartment, near rear bulkhead
connector
Fusible Link X RH front of engine compartment, at Battery
Junction Block 201-
Headlight Dimmer Switch Lower LH side of steering column. 201-
Headlight Door Module Lower LH side of front compartment 201-11-C
High Speed Blower Relay On RH side of heater-A/C plenum 201-13-A
Ignition Coil Top of engine, left of throttle body
Ignition Switch At base of steering column
Multi-Function Lever Top LH side of steering column 201- 8-E
(Continued on next page)
201-
201-
4-A
3-B
201- 4-A
201-
201-
4-A
8-B
3-A
8-F