I ran the photo's through Google AI, heres what it came up with.
In a 1988 Pontiac Fiero with the 2.8L V6, these two connectors are found in the center console area, usually behind the cigarette lighter or ashtray panel.
The white connector is the C203 bulkhead interface. It is the primary "handshake" between the engine's computer (ECM) harness and the interior dashboard harness.
Function: It passes vital electrical signals from the engine to your instrument cluster and interior switches.
Key Circuit Pins:
Pin B (Orange): Constant 12V power supply for the fuel pump relay.
Pin C (Brown/White): Controls the "Service Engine Soon" lamp on the dash.
Pin D (Lt Blue): Carries the A/C request signal from the HVAC controls to the engine.
Pin E (Tan): Provides the signal for the oil pressure gauge.
Pin F (Tan/Blk): Operates the upshift indicator light (manual transmission only).
Common Issues: If your fuel pump isn't priming or your gauges (oil, temp, SES light) are dead, this connector is the first place to check for loose pins or corrosion.
The black connector located behind the center console, often accessed near the driver's side footwell or lower A-pillar area. It interfaces the engine harness with the interior dashboard wiring.
Wire Function Breakdown (Fiero Factory Colors)
The specific colors you identified typically correspond to these functions in the driver-side interior harness:
Black: Generally used for chassis ground.
Red: Constant 12V battery power (unswitched).
White: Typically for interior dome lights (ground-side trigger) or the tachometer signal.
Tan: Often associated with the oil pressure gauge or warning lamp.
Orange: Constant 12V power for interior lights (fused) or dash illumination.
[This message has been edited by CoolBlue87GT (edited 12-18-2025).]
