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.
Test 40A - Dimming Interior Displays
1984 Plymouth Horizon Base, 1.6 ASECTION Test 40A - Dimming Interior Displays
WARNING: This page is about a different car, the 1994 Chrysler LeBaron. However, it is still accessible from the selected car via links, so may be relevant.
- Move dimmer control lever to center position. Ensure parking lamps are off. Using DRB, read park lamp switch status. If DRB displays STEP UP : OFF, go to TEST 40B. If DRB does not display STEP UP : OFF, go to next step.
- Turn park lamps on. If DRB does not display STEP UP : OFF, go to TEST 40C. If DRB displays STEP UP : OFF, go to next step.
- Using DRB, measure panel lamp sensor voltage. Move dimmer control lever from HIGH to LOW position. If DRB display changes between zero and 5 volts, go to TEST 40D. If DRB display does not change between zero and 5 volts, go to TEST 40E.
RENDER: 1.0x
NO RELATED
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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.