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 DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 17 (A/C-HEATER SYSTEM)TROUBLE SHOOTINGMODE CONTROL MOTOR DOES NOT RUN
1998 Acura 3.5RL Special Edition
Mode Control Motor Does Not Run
1998 Acura 3.5RL Special EditionSECTION Mode Control Motor Does Not Run
WARNING: This page is about a different car, the 1998 Acura 3.2TL. However, it is still accessible from the selected car via links, so may be relevant.
- Check fuse No. 7 (7.5-amp) in underdash fuse/relay block. If fuse is blown, replace fuse. If necessary, repair short to ground. If fuse is okay, disconnect mode control motor 7-pin connector. Turn ignition on. Measure voltage between ground and 7-pin connector Black/Yellow wire. If battery voltage does not exist, repair open Black/Yellow wire between fuse No. 7 and mode control motor.
- If battery voltage exists, turn ignition off. Test mode control motor. See MODE CONTROL MOTOR TESTING . If mode control motor is okay, go to step 4). If mode control motor is not okay, remove mode control motor. See MODE CONTROL MOTOR R & I .
- Check mode control motor linkage and doors for smooth operation. If linkage and doors are okay, replace mode control motor. If linkage and doors are not okay, repair mode control linkage and doors.
- Remove climate control unit and disconnect 20-pin connector. Check continuity between ground and terminal No. 5, 6, 7, 8, 9, 11 one at a time. See Figure . If continuity exists, repair short circuit in wire(s) between mode control motor and climate control unit.
- If continuity does not exist, check 20-pin connector terminal No. 5, 6, 7, 8, 9, 11 for voltage. If voltage exists, repair short to power in wire(s) between mode control motor and climate control unit. If voltage exists, climate control unit will be damaged and must be replaced.
- If voltage does not exist, check for continuity in all wires (except for Black/Yellow wire) between mode control motor 7-pin connector and climate control unit 20-pin connector. If continuity does not exist, repair open in wire(s) between mode control motor and climate control unit.
- If continuity exists, check for loose wires or poor connections at climate control unit 20-pin connector and mode control motor 7-pin connector. If connections are okay, substitute known-good climate control unit and recheck. If symptom goes away with 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.