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Turn signal, hazard lights fix

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A component level fix for the failure prone hazard / turn signal relay in the early S/V series cars.  Fix the switch yourself for under $2.00.

You need to remove the hazard push button from the unit, gently pry behing this button on the short side, you will see what I mean, you need to pry on both short sides to undo the catch that it has.

Than the next step is to remove the housing, again prying gently, the housing is made of quite thin plastic, and slide this off the unit.

Surprise, IC etc. etc. fansy stuff. But you will see three capacitors, two small ones and one larger one.

Turn signal, hazard lights fix

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3 thoughts on “Turn signal, hazard lights fix

  1. I’m having the same issue on my 96′ 850 the number 13 fuse blows when the hazard switch is reinstalled, causing high beams, 4 way flashers and turn signals to fail.
    I replaced the switch with various ones from junkyard, chased down ground wires, cleaned stop, turn and tail bulb sockets, disconnected the battery yadda yadda, still blows fuse within 5 minutes ..
    With the switch unplugged the high beams work fine, so there must be a hot wire grounding out or switch failure, the indicator on the column seems to work proper – I’ve not taken it out yet but thought I’d reach out, is there something that’s “normal” for 850’s that cause this?
    I bought it with the issue, appears to have had previous damage/repairs to inner sheet metal, searched for broken or pinched wires…

  2. Hi everyone, I have just installed LED indicator lights (turn signal lights) on my 1998 Volvo S90, as expected they flashed too fast (hyperflash) so I started to look around the electrical system to see if I could slow them down to a normal rate. I found that by taking the Hazard switch apart and doing some checks I found that if you look at the microcontroller from the top (with the relays furthest from you) you can see that the 3rd pin from the left (pin row next to the relays) is marked IC, this pin controls how fast the lights flash. On the left of the microcontroller there is 2 capacitors, if you change the capicitor nearest the relays to a 4.7 pico farad the lights flash at a normal rate, this works for the Hazard lights as well. This may work for all Volvo’s that use this switch.
    Richard.

  3. Thanks – this was very helpful. I pulled out the hazard switch on my 1999 V70 and disconnected the harness. Couldn’t see anything that I could do to fix it so I just reattached the switch and … voila. Turn signals and hazards are on again.

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