1. Check the heater control module fuse. The fuse is located in the fuse box, in the engine compartment, near the left suspension strut.
2. Disconnect the temperature switch wiring connector.
Temperature switch connector
3. Connect a voltmeter between the center lead of the glow plug and ground.
Connecting a voltmeter
4. Turn the ignition key to position II. The preheater indicator lamp should light up for about 3.5 seconds, and the voltmeter should show voltage for about 7 seconds. Otherwise, check the wiring diagram for the preheat relay or supply wires.
5. Connect the temperature switch connector.
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