*****IMPORTANT*****
Note that the wire color layout diagrams accompanying each picture are as seen FROM the CONTROL HARNESS SIDE of the connector with the release tab (for a male side connector) or locking notch (for a female side connector) on top. That is, you are looking at the wires going into the connector, OPPOSITE the side that is pictured. Like this: How to identify ECU pin numbers.*******************
Consider this part two of The 1990 Engine Control Wiring Harness; this article covers the remaining electrical connections in the 1990 2.0L engine compartment as well as the handful of connectors that run to the interior on the driver side. For reference, the main diagram below is as viewed from the front of the vehicle; the long horizontal portion is the bit that runs underneath the radiator. This is my attempt to come full circle with the 2g Engine Bay Electrical Connections article posted by snowborder714 by providing visuals of each connector and hopefully aiding in identifying these connectors.
Each connector is given an alphanumeric identifier that follows the 1991 configuration diagram found in the electronic copy of the factory service manual: Download the 1G Service Manuals. For your convenience, these are pictured here.
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Like the engine control harness, there are notable differences between this harness and those from later model years. Generally speaking, however, this article is relevant to all 1Ga (1990 and 1991, or those with pop-up headlights) models. On the other hand, the similarities and differences between this and the 1992+ harness(es) will not be covered now but may be added in the future; if anything, this will provide a reference for you to compare with your 1992+ harness to get an idea of what certain connections / connectors / plugs are. Now, without further ado, the complete engine compartment harness:
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A-21: Air Conditioner Relay Box (black connector, small 6-pin)
A-21: Air Conditioner Relay Box (black connector, small 6-pin) /URL]
[URL="https://www.dsmtuners.com/threads/the-1990-engine-compartment-wiring-harness.473792/#post-153372381"] A-22: Air Conditioner Relay Box (black connector, large 6-pin)
A-24: Windshield Washer Motor (black connector, 2-pin)
A-25: Pop-Up Motor Left Side (black connector, 2-pin)
A-26: Front Combination Light Left Side (black connector, 2-pin)
A-27: Front Combination Light Left side (black connector, 2-pin)
A-28: Headlight Left Side (black connector, weird 3-pin)
A-29 and A-30: Horn Left Side (slip sleeves, 1-pin ea.)
A-31: Fog Light Left Side (black connector, 2-pin)
A-32: Condenser Fan Motor for AC Circuit (black connector, square 4-pin)
A-33: Front Turn Signal Light Left Side (white connector, straight 3-pin)
A-40: Radiator Fan Assembly (black connector, square 4-pin)
A-41: Front Turn Signal Light Right Side (white connector, straight 3-pin)
A-42: Radiator Water Level Switch (black connector, stacked 2-pin)
A-43: Fog Light Right Side (black connector, 2-pin)
A-44 and A-45: Horn Right Side (slip sleeves, 1-pin ea.)
A-46: Headlight Right Side (black connector, weird 3-pin)
A-47: Front Combination Light Right Side (black connector, 2-pin)
A-48: Front Combination Light Right Side (black connector, 2-pin)
A-49: Pop-Up Motor Right Side (black connector, 2-pin)
A-50: Hood Switch (black connector, 2-pin)
A-52: Engine Control Wiring Harness and Engine Compartment Wiring Harness Combination (black connector, wide rectangular 4-pin)
A-53: Engine Control Wiring Harness and Engine Compartment Wiring Harness Combination (black connector, large 1-pin)
B-17: Power Steering Pressure Switch (brown L sleeve, small 1-pin)
B-18: Alternator (ring terminal)
B-19: Alternator (connector) (black connector, large 2-pin)
B-21: Oil Pressure Switch (dummy light) (black connector, small 1-pin)
B-22: Oil Pressure Gauge Unit (black connector, small 1-pin)
C-33: Diode (orange connector, straight 3-pin)
C-47: Engine Compartment Wiring Harness and Junction Block Combination (milk white connector, large 1-pin)
C-48: Engine Compartment Wiring Harness and Junction Block Combination (milk white connector, wide 8-pin)
C-68: Instrument Panel Wiring Harness and Engine Compartment Wiring Harness Combination (black connector, 10-pin)
C-71: Engine Compartment Wiring Harness and Body Wiring Harness Combination (milk white connector, wide rectangular 6-pin)
C-72: Engine Compartment Wiring Harness and Body Wiring Harness Combination (white connector, 14-pin)
The wire color layout diagrams accompanying each picture list the original wire colors and individual wire locations are as seen FROM the HARNESS SIDE of the connector with the release tab (for a male side connector) or locking notch (for a female side connector) on top. They should be color coded correctly, but if there is a disagreement with the letters and the color of the letters, go by the letters. When two colors are listed together, the first is the main color and the second is the color of the stripe or tracer. The letters represent the following colors:
B - Black
W - White
R - Red
G - Green
L - Blue
Y - Yellow
O - Orange
Lg – Light Green
PM me if you find any errors and I will make corrections as necessary. Thanks to pauleyman for supplying the harness!
Note: There is some information that will be added in the future but this is a good base for any individuals who may need it.
Finally, the following supporting vendors supply the individual connectors linked or partial kits for different model year DSMs:
JNZ Tuning
Extreme PSI
Magnus Motorsports
At the end of the day, they are all coming from Sheridan Engineering.
EXTRA: Instead of creating another post, here's a list of the fuses in the Junction Block (J/B) (inside the cabin) by name and what number that corresponds to. These relate to factory wiring diagrams.
1 - Auto Seat Belt
2 - Empty
3 - Heater Relay
4 - Radio
5 - Cigar
6 - Door Locks
7 - 4 A/T
8 - Empty
9 - Wiper
10 - Head
11 - Gauge
12 - Turn
13 - Blank
14 - Anti-Theft
15 - Blank
16 - Heater
17 - Stop
18 - Back
19 - Room
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