- Remove the lining of the dashboard and the trim panel switches (head body).
- Take the screws and remove the switch of a heater with glass tailgate lining.
- With wire short the terminals equipped with three terminal to ground, then the second wire ensure supply at terminal 1 switch voltage of 12 V. If the light switch does not light up, replace it.
- If the light switch lights up, remove the wires and connect an ohmmeter (or probe with an autonomous power supply) between terminals 2 and 3 switches, then click the last. Ohmmeter must not be less than 1 ohm. Otherwise, replace the switch.
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