Hazard, Directional & Brake Lights

Tiny
UESM020
  • MEMBER
  • 1997 MERCURY MARQUIS
  • V8
  • 2WD
  • AUTOMATIC
  • 121,000 MILES
Recently my hazard, directional flasher and rear brake lights (except the window light) stopped working. Refering to the manual I checked the fuses and bulbs and all are fine. Also, if I manually flick the turn signal up & down the front blinker lights turn on but they do NOT flash. In my limited searching I've discoverd that my model does NOT have a "flasher" to replace and instead I have some extremely expensive CPU. Is there anything else that could be causing the problem or do you think its this CPU?
Wednesday, November 19th, 2008 AT 9:05 AM

5 Replies

Tiny
STEPHENAE
  • MEMBER
  • 4 POSTS
On my 98 merc grand marquis the hazards were not working. Replaced the turn signal switch on the steering column. Which solved my problem. Hope this helps
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Thursday, April 2nd, 2009 AT 2:38 PM
Tiny
KEVIN RC BELLAMY
  • MEMBER
  • 3 POSTS
Same thing is happening on my 97 MGM. Did you get yours fixed?
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Tuesday, November 26th, 2019 AT 10:23 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
It looks like they replaced the turn signal switch fixed the problem. Here is how the job is done in the diagrams below. Check out the diagrams (below). Please let us know if you need anything else to get the problem fixed.
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Tuesday, November 26th, 2019 AT 1:09 PM
Tiny
MRS.GOODWRENCH
  • MEMBER
  • 1 POST
  • MERCURY MARQUIS
The turn signals don't work neither do the hazards or brake lights (except the middle window brake light works). I have been told it might be lighting control processor. Okay, where is that exactly since none of my books say nothing about it?
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Tuesday, November 26th, 2019 AT 1:11 PM (Merged)
Tiny
MIKEYBDMAN
  • MECHANIC
  • 623 POSTS
Sounds to me like your multi-funtion switch is bad. This is the switch in the column that works the turn signals. The rear brake lights are feed thru this switch, but the upper light is not. Doesnt sound too hard to change. Here are the instructions.

Disable airbag system.
Tilt column to lowest position and remove tilt lever, if equipped.
Remove ignition lock cylinder.
Remove shroud screws, then remove upper and lower shrouds.
Remove two screws attaching multi-function switch to steering column casting. Disengage switch from casting.
Disconnect two electrical connectors.
Reverse procedure to install, noting the following:
Torque retaining screws to 18-26 in lb.
Activate airbag system.
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Tuesday, November 26th, 2019 AT 1:11 PM (Merged)

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