View single post by Mark Rosenbaum
 Posted: 10-28-2005 11:55 pm
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Mark Rosenbaum



Joined: 03-12-2005
Location: Kingman, Arizona USA
Posts: 532
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 Turn signals and Hazard lights use the same bulbs but different flashers.  There's also an inlne fuse for the Hazard lights, under the dash on the driver's side in US market cars.

Troubleshooting is simplest if you attach the Hazard problem first.  Check the Hazard fuse and replace it if necessary.  Cycle the Hazard switch about 20 times to break through any internal corrosion that might be present.  Verify that the Hazard flasher is in fact functional.  Check the bulbs, and their grounds (which are mostly through the lamp housings), and replace any bad bulbs.

Once all four bulbs are flashing when the Hazard switch is activated, check the turn signals.  If one side does not work but the other does, the steering column switch or its wiring is bad.  If both sides do not work the turn signal flasher or the steering column switch or its wiring is bad.

To prove or disprove that the Hazard switch is bad, unplug the wiring connector from the back of the switch.  To test the turn signal functions, jumper the two sockets at one end of the switch connector (only).  To test the hazard functions, jumper the four sockets at the other end of the connector(only).  If things work as expected with the jumpers but not with the switch in place, the switch is bad.  Sometimes they can be disassembled and cleaned, but mostly the plastic breaks when you try to do that.