YES!! It took longer than it should have but I found it.
Yes, an Undead Cleric could resurrect himself, although, not directly as would normally happen. This is assuming that, aside from his Undead state, he would otherwise be eligible for resurrection. (Mainly that he has been dead (including Undead) for less than 10 years.
First the caveats:
The first hurdle, which was brought up in the other answer is that your Cleric must still have it's Cleric abilities. To my knowledge, Pelor is not in the habit of granting spells to Undead. And deities who love Undead would be not be inclined to grant a spell to make him un-Undead. Wee-Jas may have no problem with this, and in fact with material in the Complete Divine would probably gladly endorse such things. Also, Clerics who have no Deity but instead worship an "ideal" should retain their abilities (even if their ideals change upon being Undead). (Resurrection is not a good spell so evil Clerics can cast it)
The MAIN hurdle, as was pointed out earlier, is Undead creatures can NOT be resurrected. However, "You can resurrect someone...who has been turned into an undead creature and then destroyed."
So how do we overcome? Well we have to be prepared to destroy ourselves!
From "Complete Arcane" we have a feat called "CRAFT CONTINGENT SPELL" available to casters of atleast 11th Level. Direct quote from the text: "Triggers for contingent spells are usually events that happen to the bearer of the spell, and can include death."
This is an Item Creation Feat so there are significant additional costs to use this but it gets the Cleric his life back which is apparently what this Cleric wants so I'm sure it's a completely acceptable cost.
NOW we have an interesting dilemma. How long, in levels, has your Cleric been Undead? Was he level 5 when he was "turned" and now he's level 13...is your Cleric prepared to go to level 4 when resurrected? I'm not sure that he has to, but it appears so. I think I read another question on the matter but I can't find it right now. If I do I'll link it in later, if not it would make for an interesting related question.
Yes. Turn/Rebuke Undead states:
Turning undead is a supernatural ability that a character can perform
as a standard action. It does not provoke attacks of opportunity.
You must present your holy symbol to turn undead. Turning is
considered an attack. You turn the closest turnable undead first, and
you can’t turn undead that are more than 60 feet away or that have
total cover relative to you. You don’t need line of sight to a target,
but you do need line of effect.
The link to "undead" from that directly links to the undead "type".
So the only requisites for the target is that they are within 60 feet, you have LOE, and are "undead" (i.e. of type 'undead')
So the turn should work perfectly well.
Best Answer
In 3.5, you gain experience for overcoming challenges, not for individual things you do. So a fighter doesn’t get XP for successfully attacking, a wizard doesn’t get XP for successfully casting a spell, and a cleric doesn’t get XP for successfully turning an undead creature.
Rather, they get XP when their attack, spell, or turn undead contributes to overcoming a challenge set before the party. If that challenge was combat, it’s pretty clear: if the attack helped kill an enemy, if a spell helped incapacitate an enemy, or the Turn Undead drove an enemy away, that action contributed to overcoming the challenge that was the encounter. It therefore helped them get XP. But the entire party gets XP for overcoming the challenge, regardless of how they did it.
And not every challenge is about combat. Perhaps Turn Undead outed the vampire hiding in the king’s court, or the spell deciphered an ancient prophecy, or the impressive show of martial prowess in the attack has the guards fleeing without a fight. These are also challenges worth XP.
Some DMs give bonus XP to party members who were particularly lucky or clever in overcoming challenges. Some DMs give bonus XP to party members who roleplay particularly well. Some DMs very carefully follow the CR rules in the book for calculating XP. Some DMs ignore XP altogether and then just say “you all level up!” when they have accomplished something particularly deserving.