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The glow plug relay for the Volkswagen Passat B5 is located under the hood in the main relay panel. This relay is responsible for supplying power to the glow plugs, which warm up to ignite the diesel mixture in your engine. If your glow plugs are not functioning correctly, I recommend starting by replacing the relay to ensure they are receiving power. If this doesn't solve the issue, check the connections of the wires leading to the plugs to ensure they are secure and clean. If all the wires are in good condition and the relay is new, the glow plugs themselves may be faulty and should be replaced.
The central relay box in the front dashboard of the VW Passat B5 houses the glow plug relay.