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.
Glow Plug Controller
Glow plug module controls glow plug system in 3 steps: pre-glow, after-glow, and off. During pre-glow, the circuit turns on the "WAIT" lamp and heats glow plugs until they are hot enough to start the engine. During after-glow, circuit turns off "WAIT" lamp and keeps power applied to glow plugs. When engine is turned off, module cuts off current to glow plugs.
A set of thermal controls in the module govern pre-glow and after-glow operation by sensing engine temperature. Module also has an over-voltage feature which protects glow plugs from battery voltage higher than 14 volts. Module is located on the left rear side of engine.
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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.