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.
Control module, glow plug (596): Connection
The control module is supplied with +30 from fuse 27 (60 A).
A diagnostic function integrated in the glow plug control module monitors the glow plugs so that when a fault occurs the engine control module is informed via the lead from connector pin 9 to engine control module connection 35 (K).
When the engine control module pulls pin 3(A) to ground, the glow plug control module is activated, meaning pins 1 and 2 of the control module are supplied voltage.
When voltage on pin 3 (B+) exceeds 12 V, such as when the engine has been started, the control module begins alternately supplying power to pins 1 and 2. Alternation between pins 1 and 2 is done with 5 Hz. The power supply is pulsed alternately to lower power consumption.
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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.