1988 PONTIAC FIERO Service Repair Manual

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 details about the Gener-
ator, and connections to the Battery and
Starter, see Starter and Charging System, Sec-
tion
8A-30.
The car's Power Distribution System con-
sists of Fusible Links, Fuses, Circuit Breakers,
the Light Switch and the Ignition Switch. Fusi-
ble Links are short pieces of wire to which they
supply power. They are covered with a special
high-temperature insulation. When conducting
a high current, the Fusible Link will melt and
stop current 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
and Light Switch Details for complete wiring to
the first component in each circuit.
The Ignition Switch has six positions, five of
which have detents. The BULB TEST position
is after the RUN position and just before the
START position. BULB TEST does not have a
detent. As shown in the schematic, circuits
which are supplied from the Ignition Switch are
On (Hot) for different switch positions. Indi-
vidual schematics show their fuses supplied
from headings such as "Not In Run. "The head-
ing corresponds to the Ignition Switch position
in which power is On.

BOWER DISTRIBUTION
COMPONENT LOCATION Page-Figure
Auxiliary Coolant Fan Relay
. . . . . . . RH front side of engine compartment. . . . . . . . . .
Blower High Speed Relay. . . . . . . . . . RN front of dash, near Blower Motor . . . . . . . . . .
Burn-Off Relay . . . . . . . . . . . . . . . . . . LH rear corner of engine compartment, on relay
bracket
.................................
Clutch Start Switch . . . . . . . . . . . . . . Above clutch pedal, on clutch pedal support
Cold Start Injector (VIN F) (VIN
8). . Top LH side of engine . . . . . . . . . . . . . . . . . . . . . .
Cold Start Injector (VIN S) . . . . . . . . Top LH rear of engine . . . . . . . . . . . . . . . . . . . . . .
Cold Start Switch (VIN F) (VIN 8). . . Top center of engine. . . . . . . . . . . . . . . . . . . . . . . .
Cold Start Switch (VIN S) . . . . . . . . . Top of engine
Convenience Center
. . . . . . . . . . . . . . Behind IIP, to right of steering column. . . . . . . . .
Coolant Fan Relay (VIN E). . . . . . . . . LN rear corner of engine compartment, on relay
bracket
.................................
Coolant Fan Relay (VIN F) (VIN 8) . . Front of engine compartment, RH side of
radiator support.
. . . . . . . . . . . . . . . . . . . . . . . . .
Coolant Fan Relay (VIN S) . . . . . . . . . LH rear corner of engine compartment, on relay
bracket
.................................
Electronic Control Module (ECM) . . . Behind RN side of UP . . . . . . . . . . . . . . . . . . . . . .
Electronic Spark Timing (EST)
Distributor (VIN E)
. . . . . . . . . . . . . Top rear of engine. . . . . . . . . . . . . . . . . . . . . . . . . .
Electronic Spark Timing (EST)
Distributor (VIN F) (VIN
8). . . . . . . Top rear of engine. . . . . . . . . . . . . . . . . . . . . . . . . .
Fog Light Relay . . . . . . . . . . . . . . . . . LR front of engine compartment, on fender. . . . .
Fuel Pump In-Line Fuse. . . . . . . . . . . RR side of engine compartment, on inner fender
panel
...................................
Fuel Pump Relay (VIN E). . . . . . . . . . LN rear corner of engine compartment, on relay
bracket
.................................
Fuel Pump Relay (VIN F) (VIN 8) . . . LN rear corner of engine compartment, on relay
bracket
.................................
Fuel Pump Relay (VIN S) . . . . . . . . . . LH rear corner of engine compartment, on relay
bracket
.................................
Fuel Pump Switch (VIN E). . . . . . . . . Lower LN rear of engine . . . . . . . . . . . . . . . . . . . .
Fuel Pump Switch (VIN F) (VIN 8) . . Lower LN side of engine . . . . . . . . . . . . . . . . . . . .
Fuel Pump Switch (VIN S) . . . . . . . . . Lower LN side of engine . . . . . . . . . . . . . . . . . . . .
Fuse Block. . . . . . . . . . . . . . . . . . . . . . Behind LH side of IIP, below light switch. . . . . . .
Fusible Link A (VIN E) . . . . . . . . . . . Lower RN side of engine, at Starter Solenoid. . . .
Fusible Link A (VIN F) (VIN 8) . . . . . Lower RH side of engine, at Starter Solenoid. . . . 201- 6-B

POWER DISTRIBUTION
COMPONENT LOCATlON Page-Figure
Fusible Link A (VIN S)
............ Lower RH side of engine. at Starter Solenoid ....
Fusible Link B (VIN E) ............ Lower RH side of engine. at Starter Solenoid ....
Fusible Link B (VIN F) (VIN 8) ..... Lower RH side of engine. at Starter Solenoid ....
............ Fusible Link B (VIN S) Lower
RH side of engine. at Starter Solenoid ....
Fusible Link D .................. Front lights harness. near LH side of dash ......
Fusible Link E ................... Front lights harness. near LH side of dash ......
Fusible Link G .................. Front lights harness. near LH side of dash ......
Fusible Link H (VIN E) ........... RH front of engine compartment. at Junction
Block
...................................
Fusible Link N (VIN F) (VIN 8) ..... LN front of engine compartment. behind battery
Fusible Link H (VIN S)
............ Lower RH side of engine. at Starter Solenoid ....
J (VIN E) ............ Lower RH side of engine, at Starter Solenoid ....
J (VIN F) (VIN 8) ..... Lower RH side of engine, at Starter Solenoid ....
J (VIN S) ............ RH side of radiator support. at Junction Block ..
.................. Fusible Link K RN front of engine compartment. at Junction
Block
...................................
Gear Selector Switch ............. In console, at base of gear selector ............
Hatch Fuse ..................... Attached to side of Fuse Block
Hatch Pull-Down Unit
............ Center of end panel, in cargo compartment .....
Headlight Door Module ........... LH front of dash ...........................
Ignition Coil (VIN S) .............. Rear RH side of engine ......................
Ignition Switch .................. Behind IIP. on top side of steering column ......
In-Line Fuse (VIN F)(VIN 8) ....... On LH side of radiator support. forward of
................................. battery
.................. Junction Block RH front of engine compartment. behind
................................ headlight
Lights Monitoring Module
......... Behind IIP. at base of steering column
Mass Air Flow (MAF) Relay (VIN
F)
........................ (VIN 8) LH rear corner of engine compartment, on relay
................................. bracket
Mass Air Flow (MAF) Relay (VIN S)
. Front of engine compartment. on RH side of
radiator bracket
..........................
Mass Air Flow In-Line Fuse ........ RN side of engine compartment, on inner fender
panel
...................................
Remote Dimmer ................. RH side of steering column. on IIP retainer .....
Starter Solenoid (VIN E) .......... Lower RH side of engine ....................
Starter Solenoid (VIN F) (VIN 8) .... Lower RH side of engine ....................

POWER DISTRIBUTION
COMPONENT LOCATION Page-Figure
Starter Solenoid (VIN
S) .......... Lower RH side of engine ....................
VATS Decoder Module ............ Behind LH side of IIP. above steering column
el00 (42 cavities) ................ LH front of dash. left of brake master cylinder ..
C104 (6 cavities) ................. Front of engine compartment. RH side of
radiator
.................................
Clll(1 cavity) ................... Behind battery. near positive battery cable .....
C115 (1 cavity) ................... Center front of dash ........................
C204 (4 cavities) ................. Above LH rear corner of engine ..............
C207 (15 cavities) ................ Behind RH side of IIP. near ECM .............
C208 (8 cavities) ................. Behind LH side of rear seat ..................
(2218 ........................... Behind center of IIP ........................
C219 (6 cavities) ................. Behind RH side of IIP. near Subwoofer Amplifier
G100 (VIN E) ................... RH front of engine .........................
G100 (VIN F) (VIN 8) ............. Lower LH front of engine ....................
G100 (VIN S) .................... Lower LH front of engine ....................
6103 (Except VIN E) ............. On radiator support. behind LH headlights .....
6200 .......................... Behind IIP. left of steering column ............
S108 ........................... Engine harness. lower RH side of engine .......
S164 ........................... IIPharness. aboveFuseBlock ................
S166 (VIN E) .................... Engine harness. above rear of engine ..........
S166 (VIN F) (VIN 8) ............. Engine harness. above LH rear of engine .......
S166 (VIN S) .................... Engine harness. lower RH side of engine .......
S168 (VIN F) (VIN 8) ............. Engine harness. RH front of dash .............
S168 (VIN S) .................... Engine harness. top rear of engine ............
S200 ........................... IIP harness. behind LH side of IIP ............
S205 ........................... IIP harness. behind instrument cluster .........
S223 ........................... IIP harness. above Fuse Block ................
S224 ........................... IIP harness. near LH shroud
S225
........................... IIP harness. behind instrument cluster .........
S232 ........................... IIP harness. behind LH side of IIP. above Fuse
................................... Block
S236
........................... IIP harness. below light switch ...............

FUSE DATA DETAILS: FUSE DATA
E:ge Connector
(To Junction
Block- LP
Brown Connector
Fog Lights
I
ite Connector
White Connecto
REAR VlEW OF FUSE BLOCK
FRONT VlEW OF
FUSE BLOCK Cavity and Connector Locations
CONVENIENCE CENTER

3 FUSE BLOCK DETAILS: lNST LP FUSE 2
R
LIGHT SWITCH DETAILS
PAGES 12-0 AND 124
r------"""----------------------------------
I I BLOCK I
I I-
I I I I - -
8RN
SWITCH - PAGES 100-4,

a FUSE BLOCK DETAILS: CTSY FUSE AND TAIL FUSE I:
.8 ORNIBLK
CONVENIENCE
CENTER
LIGHT
- CONSOLE RELAY (PAGE 1140) (PAGE 114-0) (PAGE 40-0)
- SWITCH DOOR LOCK DOOR LOCK MIRROR COMPARTMENT CLUSTER
(PAGE 1340) - S-W a LIGHT - (DIGITAL CLUSTER)
(PAGE 130-0) (PAGE 130-0) (PAGE 141-0) (PAGE 114-1) (PAGE 82-0)

% FUSE BLOCK DETAILS: PWR ACC CIRCUIT BREAKER AND STOP HAZ FUSE
r""""""""-------------- ....................... ,FUSE I I I BLOCK
I PWR ACC I-
I STOPHAZ I I BREAKER FUSE - I
I i 35 AMP 20 AMP I I L-------------- ------,---------------------- --------J
CONVENIENCE CENTER PAGE IlOO