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Old 01-01-2011, 09:25 PM   #1
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Default Turn signals and hazards not working...

1998 Jeep Cherokee Classic 6 cylinder 4.0L, the turn signals just stopped working while I was driving it. The hazard warning lights don't work either.

I checked the fuses, no go there.

I've tried replacing the flasher unit with a brand new one. Still not working.

I tried replacing the multi function switch, and the switch itself doesn't seem to make a difference either. (I returned the new switch, but I still have both flasher units)...

Any ideas?

Did I buy a faulty flasher?

Is there something I can do to check the rest of the circuit easily?

Does anyone have a wiring layout diagram that tells me where I can test this stuff?

Help, MY ARM IS GETTING COLD!!!

Z.
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Old 01-01-2011, 09:30 PM   #2
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It's the switch.
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Old 01-01-2011, 09:39 PM   #3
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Must be the switch as turn signals and hazards run on two different flashers.
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Old 01-01-2011, 09:43 PM   #4
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If it's the switch, then why did a replacement switch not work?

Does anyone have a pin out that will enable me to test either the switch or the flasher or the circuit?

The flasher connections seem straightforward enough, TS, HAZ, IGN, BAT and GND... I'm thinking with the ignition on I should have 12 volts between IGN or BAT and GND. If I don't then it's probably the wiring up to the flasher. If I do then I should be able to supply 12V to the TS and HAZ terminals and then if the wiring/multifunction switch works (but without flashing) then it's the flashers. If it still isn't working it's the wiring between the flasher and the switch (probably).

Does this seem reasonable?

Z.
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Old 01-01-2011, 09:47 PM   #5
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Quote:
Originally Posted by cwvs View Post
Must be the switch as turn signals and hazards run on two different flashers.
Not on the 1998... It uses a single five pin flasher marked IGN, BAT, GND, HAZ and TS... This makes me think it has two inputs, a ground, and two outputs. One input is constantly on and "flashes" on the hazard output, the other input is on when the car is on and "flashes" on the turn signal output.

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Old 01-01-2011, 09:57 PM   #6
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Old 01-08-2011, 01:15 AM   #7
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Quote:
Originally Posted by ezab View Post

Some really Useful diagrams!!!


THANK YOU SO MUCH!

With the help of those diagrams and a multimeter I probed away at the flasher socket and discovered that I had exactly what I expected everywhere... EXCEPT the BAT connection... I expected that to be a constant +12V (or so) but in fact I got nothing.

Consulting the diagrams you provided I spotted that that connection was fused, but not in the passenger compartment fuse box, but instead in the under hood power distribution centre. I quickly looked through all of the 15A fuses there (they're helpfully not numbered or labeled) and found what was obviously the culprit. A blown fuse.

I replaced that and everything works again. In future I guess I'll check the fuses under the hood as well as those in the passenger compartment whenever anything fails.

Z.
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Old 01-09-2011, 10:36 AM   #8
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http://www.ehow.com/how_5593539_repa...nal-relay.html

this is for a 97 cherokee but it works for all of them.
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Old 01-09-2011, 10:44 AM   #9
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This might come in handy in the future: Jeep Cherokee Electrical - 1997 - 2001 XJ Fuse & Relay Identification - Reference guide to the fuses, ratings (Amps), relays and circuit information.
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Old 01-09-2011, 11:39 PM   #10
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Thank you. We've bookmarked both links for future reference.
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