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Fiero Wiring Information - FieroAddiction_com.htm
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!-- saved from url=(0043)http://www.fieroaddiction.com/c203c500.html -->
<HTML><HEAD><TITLE>Fiero Wiring Information - FieroAddiction.com</TITLE>
<META http-equiv=Content-Type content="text/html; charset=windows-1252">
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<BODY>
<P align=center> </P>
<P align=center><BIG><BIG><BIG>Fiero C203 & C500</BIG></BIG></BIG></P>
<P align=center>This is a list of all the connections that are needed to tie
into the Fiero electrical system when doing an engine conversion. This list is
to aide in the wiring process. All circuits should be verified before any
connections are made. To the best of my knowledge, all of the info below is
correct.</P>
<P align=center>The C203 connector is clear plastic and located under the center
console. The C500 connector is next to the battery, half of it is for the tail
light harness, the other half for the engine. Descriptions of each one
follows:</P>
<P align=center><BIG><BIG>Fiero C203 connector</BIG></BIG></P>
<DIV align=center>
<CENTER>
<TABLE width=608 border=1>
<TBODY>
<TR>
<TD width=31>Pos.</TD>
<TD width=85>Wire color</TD>
<TD width=127>Circuit</TD>
<TD width=349>Description</TD></TR>
<TR>
<TD width=31>A</TD>
<TD width=85>Tan/Black</TD>
<TD width=127>Upshift lamp</TD>
<TD width=349>Grounding this wire will make the upshift indicator come
on.</TD></TR>
<TR>
<TD width=31>B</TD>
<TD width=85>Orange</TD>
<TD width=127>Fuel Pump</TD>
<TD width=349>Positive feed for the fuel pump relay. Hot at all times
fused 10A</TD></TR>
<TR>
<TD width=31>C</TD>
<TD width=85>Brown/White</TD>
<TD width=127>SES lamp</TD>
<TD width=349>Grounding this wire will make the "Service Engine Soon"
indicator come on</TD></TR>
<TR>
<TD width=31>D</TD>
<TD width=85>Lt Blue</TD>
<TD width=127>A/C on</TD>
<TD width=349>Positive feed for the A/C compressor control relay coil. Hot
when A/C is on.</TD></TR>
<TR>
<TD width=31>E</TD>
<TD width=85>Tan</TD>
<TD width=127>Oil gage</TD>
<TD width=349>Connect to oil pressure sender, 90 ohms at max
pressure</TD></TR>
<TR>
<TD width=31>F</TD>
<TD width=85>Pink/Black</TD>
<TD width=127>ECM Ign.</TD>
<TD width=349>Positive feed for ECM. Hot in run, bulb test, or start.
fused 10A.</TD></TR>
<TR>
<TD width=31>G</TD>
<TD width=85>Yellow</TD>
<TD width=127>VSS high</TD>
<TD width=349>VSS input to speedometer. Connect to magnetic VSS or
converted 4000 PPM signal from ECM. Note 3</TD></TR>
<TR>
<TD width=31>H</TD>
<TD width=85>Brown</TD>
<TD width=127>VSS feed for ECM</TD>
<TD width=349>Feeds buffered VSS signal to ECM when a magnetic VSS is
connected to speedometer. Note 3</TD></TR>
<TR>
<TD width=31>J</TD>
<TD width=85>Pink</TD>
<TD width=127>TBI INJ1</TD>
<TD width=349>Positive feed for injector. Hot in run, bulb test, or start.
fused 5A</TD></TR>
<TR>
<TD width=31>K</TD>
<TD width=85>Pink</TD>
<TD width=127>TBI INJ2</TD>
<TD width=349>Positive feed for injector. Hot in run, bulb test, or start.
fused 5A</TD></TR>
<TR>
<TD width=31>L</TD>
<TD width=85>Tan/White</TD>
<TD width=127>Fuel pump</TD>
<TD width=349>Positive side of fuel pump, gets connected to the COM
terminal of the fuel pump relay.</TD></TR>
<TR>
<TD width=31>M</TD>
<TD width=85>Black</TD>
<TD width=127>VSSB ground</TD>
<TD width=349>Connect to ground</TD></TR>
<TR>
<TD width=31>N</TD>
<TD width=85>Black</TD>
<TD width=127>A/C Power</TD>
<TD width=349>Positive feed for A/C compressor control relay contacts.
Fused 25A</TD></TR>
<TR>
<TD width=31>P</TD>
<TD width=85>Purple</TD>
<TD width=127>TCC Brake switch</TD>
<TD width=349>TCC brake. Hot in run, bulb test, or start only when brake
pedal is NOT depressed. </TD></TR>
<TR>
<TD width=31>R</TD>
<TD width=85>Purple</TD>
<TD width=127>VSS low</TD>
<TD width=349>VSS input to speedometer. Connect to magnetic VSS or to
ground if using optical VSS and converter. Note
3</TD></TR></TBODY></TABLE></CENTER></DIV>
<P align=left><BR>Notes<BR>1. F is the switched power feed for the ECM, all
switched 12 volt inputs on the ECM can be connected to this terminal. The
constant 12 volt supply for the ECM comes from the rust colored fusible link
with a single weatherpack disconnect at the terminal block near the battery.</P>
<P align=left>2. J, & K are the positive feeds for the fuel injectors,
One for each injector on TBI systems or one for each bank on PFI systems.</P>
<P align=left>3. The Fiero speedometer system works differently than most other
GM vehicles. Click <A href="http://www.fieroaddiction.com/speedo.html">HERE</A>
for more info.</P>
<P align=left> </P>
<P align=center><BIG><BIG>Fiero C500 connector</BIG></BIG></P>
<P align=center>I've found that the C500 connections vary considerably depending
on year.<BR></P>
<DIV align=center>
<CENTER>
<TABLE width=606 border=1>
<TBODY>
<TR>
<TD width=29>Pos.</TD>
<TD width=98>Wire color</TD>
<TD width=89>Circuit</TD>
<TD width=366>Description</TD></TR>
<TR>
<TD width=29>A2</TD>
<TD width=98>Black</TD>
<TD width=89>Ground</TD>
<TD width=366>Ground</TD></TR>
<TR>
<TD width=29>A4</TD>
<TD width=98>Yellow</TD>
<TD width=89>Start</TD>
<TD width=366>Hot in start, connect to gear selector switch. Automatic
only</TD></TR>
<TR>
<TD width=29>B3 </TD>
<TD width=98>Brown</TD>
<TD width=89>Charge</TD>
<TD width=366>Charge indicator light. Connect to alternator brown
wire.</TD></TR>
<TR>
<TD width=29>C1</TD>
<TD width=98>Dark Blue</TD>
<TD width=89>Reverse</TD>
<TD width=366>Reverse light switch power feed. Connect to gear selector
switch(auto.) or reverse switch(man.) Fused 10A. Note 1</TD></TR>
<TR>
<TD width=29>C2 </TD>
<TD width=98>DkGreen/White(V6)
<P>Tan(L4)</P></TD>
<TD width=89>Temp gage</TD>
<TD width=366>Connect to temp sender, 1365ohm@100deg.,55ohm@260deg.</TD></TR>
<TR>
<TD width=29>C3</TD>
<TD width=98>White</TD>
<TD width=89>Tach</TD>
<TD width=366>Connect to coil or ign module.</TD></TR>
<TR>
<TD width=29>D1</TD>
<TD width=98>Dk Green/white</TD>
<TD width=89>Fan switch</TD>
<TD width=366>Connect to grounding fan switch or ECM fan output</TD></TR>
<TR>
<TD width=29>D2</TD>
<TD width=98>Lt Green/Black</TD>
<TD width=89>Fan switch</TD>
<TD width=366>Same as above(with optional two speed fan only)</TD></TR>
<TR>
<TD width=29>D3</TD>
<TD width=98>Dark Green</TD>
<TD width=89>Temp lamp</TD>
<TD width=366>Connect to grounding temp switch or ECM temp output.</TD></TR>
<TR>
<TD width=29>E1</TD>
<TD width=98>Lt Green</TD>
<TD width=89>Reverse</TD>
<TD width=366>Connect to gear selector switch(auto.) or reverse
switch(man.) along with C1. Note 1</TD></TR>
<TR>
<TD width=29>E2</TD>
<TD width=98>Purple</TD>
<TD width=89>Start</TD>
<TD width=366>Hot in start, connect to starter. Manual only</TD></TR>
<TR>
<TD width=29>E3</TD>
<TD width=98>Pink</TD>
<TD width=89>Ignition</TD>
<TD width=366>Hot in run, bulb test, or start. Power feed for ignition
coil</TD></TR></TBODY></TABLE></CENTER></DIV>
<OL>
<LI>
<P align=left>Cars equipped with four speed manual transaxle use a shifter
mounted reverse switch. Cars with five speed use a transaxle mounted switch.
'85 and newer cars are wired for both switches.</P>
<LI>
<P align=left>There is a stud terminal directly under the C500 for making all
+12 volt constant connections. </P>
<LI>
<P align=left>The Fiero uses a separate module for cruise control. It is
located behind the carpet on the drivers side inner kick panel. If you wish to
use the new donor ECM to control the cruise control (recommended), you will
need to extend the wires from the original module to the new ECM.</P></LI></OL>
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