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Old 11-06-2018, 01:38 PM
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No front turn signals with headlights on

Exhausted the search for the following 2008 JK issue:

When in park or in gear, headlights come on (DTRL) and turn signals flash both front and back properly, hazards work ok

When headlights are turned on, front turn signals go out, rear flash, dash and rear turn signals flash fast, no hazards on front as well.

When DTRL are on, the turn signals flash normal speed and then just before you make a turn/slow down, they will speed up.

When headlights are on, they will flash fast and then flash slow just before you turn/slow down.

I have changed the front bulbs (3157). I have not changed any other bulbs for the exterior lighting and the bulbs are not LED, they are OEM.

Some positive direction would be very much appreciated. My next step is to take to a dealer or shop and have them diagnose... trying not to enter the MoneyChucker Machine....

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Old 11-06-2018, 02:07 PM   #2
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Old 11-12-2018, 11:39 AM   #3
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Check the turn signal switch. A new one is about $50 and easy to replace.
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Old 11-12-2018, 05:37 PM   #4
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your MF switch may be going out, mine was causing my fog lamps to turn off for a second while my right signal was flashing but acted normal when I used the left signal
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Droid HU, Tweeter Mod, LED head lamps and fogs, front carpet delete, '14+ Oil cooler housing
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Old 11-15-2018, 08:55 AM
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I have replaced it with one from Extreme Terrain and one from the local Dealer. I still have the same issue. Also, we are having issues with the Service Engine light coming on telling me the EGR has an issue, we have put 2 of those in as well. One from local parts store and the other direct from the dealer. Wondering if this too is related to a TIPM failure...

When we replaced the EGR, I had no service engine light on for about a week and half, then pops on...

Can the TIPM be reset (disconnecting the battery connections/unplug all the connectors to the TIPM), let it set over night and reconnect everything and go thru the initialization process (ignition key in on position for 12 seconds, turn off - repeat as needed until all dash lights go out)????

I think I have scratched my hair until bald at this point!
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Old 11-17-2018, 09:13 PM   #6
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hmmmmm that does sound odd, but you can try the battery trick (not sure from there what else it could be) you might be looking at replacement of the TIPM thing, I don't think the BCM/ECM are needing replacement but I would suggest having them checked out just in case.
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Droid HU, Tweeter Mod, LED head lamps and fogs, front carpet delete, '14+ Oil cooler housing
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Old 07-10-2019, 11:04 AM
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UPDATE:
After 3 different mechanics, 2 of which claimed to be electrical guru's.. and a few months of pondering the purchase of a new TIPM, my horn failed. This led me to more Google searches and discovered the horn is grounded at the same contact point as the turn signals. Cutting the old connector off and getting out the soldering gun, 3 new connectors (to accommodate the 7 wires that are connected to the same ground), about a half hour of time, we now have the turn signals working properly and the horn in functioning as well..... Like real estate being location, location, location.... electrical is grounds, grounds, grounds! happy Trails and hope this helps someone else in lighting peril!!!
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