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 MANUALSACURA19983.5RL SPECIAL EDITIONREPAIR AND DIAGNOSIS (SINGLE PAGE)HEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSA/C-HEATER SYSTEMSELF-DIAGNOSTICSCODE C: SUNLIGHT SENSOR
1998 Acura 3.5RL Special Edition
Code C: Sunlight Sensor
1998 Acura 3.5RL Special EditionSECTION Code C: Sunlight Sensor
- Remove climate control unit and disconnect 8-pin and 20-pin connectors. Remove sunlight sensor and disconnect connector. See SUNLIGHT SENSOR R & I . Check for continuity between ground and climate control unit 20-pin connector terminal No. 16 (White/Red wire).
- If continuity does exist, repair shorted White/Red wire between climate control unit and sunlight sensor. If continuity does not exist, check for continuity in White/Red wire between climate control unit connector and sunlight sensor connector. If continuity does not exist, repair open White/Red wire between climate control unit and sunlight sensor.
- If continuity does exist, check for continuity in Pink/Blue wire between climate control unit 8-pin connector and sunlight sensor connector. If continuity does not exist, repair open Pink/Blue wire between climate control unit and sunlight sensor. If continuity does exist, reconnect sunlight sensor connector.
- Test sunlight sensor. See SUNLIGHT SENSOR TESTING . If sunlight sensor is okay, check for loose wires or poor connections at climate control unit 8-pin and 20-pin connectors and sunlight sensor connector. If connections are okay, substitute known-good climate control unit and recheck. If symptom does not exist after substituting known-good climate control unit, replace original climate control unit.
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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.