Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSHONDA1990ACCORD DX, 2D COUPE, AUTOMATICREPAIR AND DIAGNOSISTRANSMISSIONAUTOMATIC TRANSSHIFT INTERLOCK SYSTEMSSYSTEM TESTINGSHIFT & KEY INTERLOCK SYSTEMSKEY INTERLOCK SYSTEM
1990 Honda Accord DX, 2D Coupe, Automatic
Key Interlock System
1990 Honda Accord DX, 2D Coupe, AutomaticSECTION Key Interlock System
- Disconnect 8-pin connector from interlock control unit. Interlock control unit is located behind left side of instrument panel, near kick panel. See Figure.
- Using ohmmeter, check continuity between Black wire of 8-pin connector and ground. Continuity should exist. If continuity exists, go to step 4).
- If continuity does not exist, check for defective ground connection or open circuit in Black wire between interlock control unit and ground. Ground is located behind kick panel on driver side, near hood latch, or behind kick panel on passenger side.
- Ensure shift lever is in Park. Using ohmmeter, check continuity between Green/White wire of 8-pin connector and ground. Continuity should exist. If continuity exists, go to step 7).
- If continuity does not exist, check for open circuit in Green/White wire between interlock control unit and shift position console switch. Shift position console switch is located on side of shift lever. See Figure. If Green/White wire is okay, go to next step.
- Check for defective ground connection or open circuit in Black wire between shift position console switch and ground. Ground is located behind kick panel on driver side, near hood latch, or behind kick panel on passenger side. If Black wire and ground connection are okay, check shift position console switch. See SHIFT POSITION CONSOLE SWITCH under COMPONENT TESTING. If shift position console switch is okay, go to next step.
- Turn ignition lock assembly to ACC position. Using voltmeter, check voltage between ground and White/Red and White/Blue wires of 8-pin connector. Ensure battery voltage should exist. If battery voltage exists, wiring circuit is okay.
- If battery voltage does not exist, check for defective No. 25 fuse (20-amp) in engine compartment fuse box. If fuse is okay, check for open circuit in White/Yellow wire between No. 25 fuse and key interlock switch and key interlock solenoid. Key interlock switch and key interlock solenoid are located on ignition lock assembly. See Figure.
- If White/Yellow wire is okay, check key interlock solenoid. See KEY INTERLOCK SOLENOID under COMPONENT TESTING. If key interlock solenoid is okay, check for open circuit in White/Red and White/Blue wires between key interlock solenoid and interlock control unit. Repair wiring as necessary.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.