defroster light does not light on 2008 - Hyundai Forums : Hyundai Forum
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post #1 of 22 (permalink) Old 12-09-2018, 11:37 PM Thread Starter
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defroster light does not light on 2008

defroster light does not light on 2008, nor does defroster work(rear). I cannot find a fuse? I am considering just replacing climate control unit. Is there a fuse? Does anyone have an electrical diagram of the back of the control unit as to where a person could test the control unit?
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post #2 of 22 (permalink) Old 12-10-2018, 12:38 AM
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Garage
According to the manual, there's a 40 amp fusible link in the engine compartment for the defogger relay. I've attached a photo of it from the manual. It's labeled as RR HTD. Might be worth a look.
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Last edited by Pi_User5; 12-10-2018 at 12:41 AM. Reason: Defogger, not a defrogger
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post #3 of 22 (permalink) Old 12-10-2018, 12:43 AM
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Originally Posted by Remo2110 View Post
defroster light does not light on 2008, nor does defroster work(rear). I cannot find a fuse? I am considering just replacing climate control unit. Is there a fuse? Does anyone have an electrical diagram of the back of the control unit as to where a person could test the control unit?
Check Fuse#36 [MIRR HTG Fuse 10A].
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File Type: jpg Glass Defogger diagram.jpg (427.2 KB, 44 views)
File Type: jpg Fuse Info.jpg (516.0 KB, 9 views)
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post #4 of 22 (permalink) Old 12-10-2018, 04:33 AM
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Originally Posted by Remo2110 View Post
Is there a fuse??
Yeah, but not fuse #36. It's the one out on the engine bay that Pi_User5 mentioned.

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Does anyone have an electrical diagram of the back of the control unit as to where a person could test the control unit?
@wongpfh attached the circuit schematic, but what you really need is the AC control module connector pin out. He can't give you that though until you tell him what AC system your car is fitted with? Is it auto AC with the digital display, or is it manual AC with the three rotary controls?
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post #5 of 22 (permalink) Old 12-13-2018, 12:26 AM Thread Starter
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it is the manual AC with three rotary controls.
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post #6 of 22 (permalink) Old 12-13-2018, 10:03 AM Thread Starter
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I also replaced fuse in engine compartment. 40 amp. Actually switched it with another.
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post #7 of 22 (permalink) Old 12-13-2018, 12:53 PM
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Yeah, but not fuse #36. It's the one out on the engine bay that Pi_User5 mentioned.


@wongpfh attached the circuit schematic, but what you really need is the AC control module connector pin out. He can't give you that though until you tell him what AC system your car is fitted with? Is it auto AC with the digital display, or is it manual AC with the three rotary controls?
A/C diagrams attached.
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File Type: jpg Blower & AC Controls-1.jpg (170.8 KB, 8 views)
File Type: jpg Blower & AC Controls-2.jpg (209.7 KB, 9 views)
File Type: jpg Connector M22-1.jpg (82.9 KB, 5 views)
File Type: jpg Connector M22-2.jpg (107.0 KB, 7 views)
File Type: gif M22-1,-2 Location.gif (153.4 KB, 8 views)
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post #8 of 22 (permalink) Old 12-18-2018, 12:44 PM Thread Starter
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So I have even tried a different control module. Did not work. Which wires or how do I trace it to see if it works back to fuse?
or what do I do with the diagrams? I can use a multimeter. Do I test the rear defog pin on M22-2, number 23 with the ground Pin, and should get continuity? At a loss as to how to troubleshoot it. Any help would be nice.
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post #9 of 22 (permalink) Old 12-18-2018, 06:07 PM
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I'm going to go out on a limb and ask if you checked the connector to the rear window grid or looked for a broken grid?
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post #10 of 22 (permalink) Old 12-18-2018, 09:53 PM
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At a loss as to how to troubleshoot it. Any help would be nice.
The very first thing I would do if I was troubleshooting the fault is check ALL the fuses(ignition on). Test them using a voltmeter or test light rather than removing them all from the fusebox and looking. That's a much quicker and easier way to test them.

The second thing I'd do is bypass the BCM and make sure the relay is able to switch on and supply power to the screen & tell tale light on the switch.

Referring to the defogger diagram you can see that the relay control wire enters the dashboard fusebox on terminal 8 of connector 'C' (blue wire). Locate that wire on the connector and back probe it using a pin (straightened out paper clip). With the connector still plugged into the fusebox, use a length of wire (or the ammeter in your multimeter) to connect the back probe pin to ground. When you ground the back probe you should hear the relay inside the fusebox click and the tell tale light on the switch should illuminate. If not, you'll need to check the relay power supply next, which is on terminal 2 of connector 'G' (heavy red wire).

BTW, a broken heater element/grid or a loose connection on the element power supply wiring shouldn't prevent the switch tell tale light from illuminating, according to the diagram at least.

Location of Fusebox Connector 'C'
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