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.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.