A friend has a Toyota Camry 1998.
All 4 turn indicaters, examined from outside, blink correctly when the hazard button is depressed/released and when the turn indicator is positioned left/right/off.
The problem is that a clicking (high speed) is heard when the hazard indicator is released and the turn indicator is positioned off. The clicking sounds like it originates about 10cm behind the dash cover in front of the driver and about 20cm below the bottom of the instrument cluster. The location is presumed to be that of the thermal oscillator.
The clicking ceases sometimes when brakes are applied. The clicking can also be made to cease (only to resume again a few dozen seconds later) when the area near the location of the sound is jiggled with a hand stuck up under the dash. Jiggling the turn indicator has no effect. Until a replacement owner's manual is acquired, the car's owner does not know how to replace the thermal oscillator.
Without a wiring diagram, I have been unable to imagine a failure that would account for the symptoms. I assume clicking from the thermal oscillator indicates current flowing, but all 4 signal lights extinguished means no current is flowing. My understanding of standard automotive design implies that a short (rather than an open) is highly improbable, especially without blowing a fuse, or entirely disabling the signal lights.
Has anyone else seen this problem?
Is there a known fix?
Can anyone explain what might be happening?