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 MANUALSOLDSMOBILE1987FIRENZA BASE, 4D SEDAN, 2.0 K, AUTOMATICREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTHEATED GLASS/DEFOGGERSDEFOGGER - REAR WINDOWTESTINGGRID TEST
1987 Oldsmobile Firenza Base, 4D Sedan, 2.0 K, Automatic
Grid Test
1987 Oldsmobile Firenza Base, 4D Sedan, 2.0 K, AutomaticSECTION Grid Test
- Start engine and turn control switch on. Using a test light connected to ground, lightly touch each grid line. If test light shows full brilliance at both ends of all grid lines, check for loose ground wire. Test light brilliance will gradually change as test light probe is moved from left bus bar to right bus bar.
- Contact each grid line a few inches on either side of glass centerline to eliminate the POSSIBILITY of missing a break in grid line. If a problem on a grid line is detected, place test light probe on that grid line at left bus bar and move probe toward right bus bar until light goes out. This will indicate break in continuity of grid line. See Fig 1 .
RENDER: 1.0x
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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.