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> XD2 04-06 Elantra Defrost/Defog A/C Bypass
Options V
- The switching is done electronically via microprocessors, rather than mechanically.
- There is no practical way to alter the circuit board to disconnect the A/C and defroster.
- The only way to do this is to install a switch to manually turn off the A/C when you don't want it to come on with the defroster.
- A switch is spliced into the #17 wire in the connector for the heater control module. (yellow with black stripe)

- The best switch setup I could come up with requires sacrificing the cigarette lighter to provide a convenient and sensible location for the switch.
- The finished setup looks like it belongs there.

- The bypass switch works perfectly. When the switch is turned off, the A/C turns off, whether it was activated automatically by the defroster or manually with the A/C switch. The defroster continues to work normally otherwise. If the switch is turned back on, the A/C comes back on.
- The A/C switch light is independent of the operation of the defroster and the bypass switch. If the bypass switch is turned off and you press the A/C button, the light comes on, but the A/C does not.


More photos can be found here, compliments of BNystorm: http://rides.webshots.com/album/464134161SnluyZ

Last update: May 9 2009, 10:54 PM by elantragt    Created: May 9 2009, 09:36 AM by Sarge    Edits: 4    Views: 2,132
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