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 MANUALSBUICK1985LESABRE V8-350 5.7L DSLREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTGLOW PLUG SYSTEMRELAYS AND MODULES - GLOW PLUG SYSTEMGLOW PLUG CONTROL MODULESERVICE AND REPAIRGLOW PLUG CONTROLLER DIAGNOSIS
1985 Buick LeSabre V8-350 5.7L DSL
Glow Plug Controller Diagnosis
1985 Buick LeSabre V8-350 5.7L DSLSECTION Glow Plug Controller Diagnosis
1985
1. If there is no voltage at the glow plugs, or a ``Wait'' lamp malfunction, disconnect electrical connector from glow plug controller.
2. Place ignition switch in Run position and check for voltage at connector terminals as well as controller relay stud terminals. Ensure terminal C (black) is grounded.
3. Battery voltage should be indicated at terminals A (dark blue) and B (pink/black) and the red relay terminal. No voltage should be indicated at terminal D (purple) or the green relay terminal.
4. If voltage is not present at terminal A, check ``Wait'' lamp bulb and associated wiring for an open. If voltage at any other terminal is incorrect, check circuit to that terminal.
5. If voltages at connector and relay terminals are correct, replace glow plug controller.
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.