Rapidly blinking turn signal indicators on IPC (buzzing sound)
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Cadillac Seville / Cadillac Eldorado Forum Discussion, Rapidly blinking turn signal indicators on IPC (buzzing sound) in Past Cadillac Vehicle Discussion; I'm having a problem that has been getting progressively worse. My turn signal indicators on the instrument panel cluster have ...
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    rducote is offline Cadillac Owners Member
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    Rapidly blinking turn signal indicators on IPC (buzzing sound)

    I'm having a problem that has been getting progressively worse. My turn signal indicators on the instrument panel cluster have been blinking and making that "clicking" sound more and more rapidly lately. In fact, today when I signaled a turn the rapid clicking noise has gotten so fast that it almost sounds like a buzz now. The voltage reading on the IPC was at 14.2V when this occurred. Later when it went down to about 13.8V the clicking noise slowed down a little but not much. This is affecting both the right and left indicators on the IPC. I even checked the rear of my car to see if a bulb has burnt out but the rear tail lights blink normally. Any ideas what this could be? At first I thought maybe the IPC was getting too much voltage, but I believe 13.8-14.2 is pretty normal. The only DTC set is one for low refrigerant and one for a communication error with the heater/ac programmer (I forgot the exact numbers). Nothing that seems related to the IPC though.

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    97EldETC's Avatar
    97EldETC is offline Cadillac Owners Fanatic
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    There may be a short somewhere. That happened to our Outlook. A short in he rear light causing the signal to flash fast every so often.

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    Ranger's Avatar
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    Re: Rapidly blinking turn signal indicators on IPC (buzzing sound)

    Might check the bulb sockets to see if there is any rust in them.

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    N*Caddy's Avatar
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    Re: Rapidly blinking turn signal indicators on IPC (buzzing sound)

    The IPC has no link what so ever with the turning signal other than the small indicator lamps.
    The turning signal (on/off & click) operation is done by a small flasher relay situated underneath the driver's side dashboard. There is a kick panel (with a light on it) the flasher is located on the left edge away from the break pedal. It will be visible once you remove the kick panel (2 or 3 self-tapping screws).
    This is the item you are looking for:

    Note the metal clip, it is what hold the relay moving about and you will find it wrapped in a bit of foaming (I believe dark gray).
    The flasher is designed with a "safety" feature to click faster if one of the 4 (yeah 4) light bulbs is burned (or not making contact in the socket). You have 3 bulbs in the back in the taillight (for each side) and 1 in front. Either one will trigger the hyper flash.
    If you are sure that ALL bulbs are lighting up then you go after the flasher (is quite inexpensive and requires no skill to be replaced).

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    carnut is offline Cadillac Owners Master
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    Re: Rapidly blinking turn signal indicators on IPC (buzzing sound)

    Walk around the car again, key on, engine off and one side then the other blinking. You most likely will find either a bulb inop or dim as its blinking. Common for corroded sockets causing hi resistance resulting in a rapid flasher operation.

  7. #6
    rducote is offline Cadillac Owners Member
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    Re: Rapidly blinking turn signal indicators on IPC (buzzing sound)

    Well, guys, I sincerely appreciate all the advice you all have given me. Turns out though that the problem seems to have went away on its own. My turn signal indicators on the IPC started operating normally and continue to do so for the last few days before I had a chance to even look into it. I see that all my lights are still good. I guess I'll be dealing with the problem again soon though since I doubt it's really gone for good. Will bookmark this page for when that happens.

  8. #7
    rducote is offline Cadillac Owners Member
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    Re: Rapidly blinking turn signal indicators on IPC (buzzing sound)

    Update:

    The problem came back and I checked for burnt bulbs. One of the turn signals bulbs (size 2057) pulled out of the base of the bulb and wasn't well connected but still working. I changed the bulb and the turn signals were still blinking rapidly. I proceeded to R&R the turn signal flasher. My signals finally started working correctly again. Thanks for the advice everyone, especially you N*Caddy!

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