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Unread 03-29-2013, 07:03 AM   #1
MN59ZJ
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1998 ZJ 
 
Join Date: Apr 2010
Location: Lakeville, MN
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Cruise no workie

When I press the on/off switch, the cruise light on the dash does not come on, & I can't engage cruise. The light does work, it comes on at start up. I'm not getting any error codes, and I tried swapping switches with junkyard parts, but that didn't work. the fuse is good, does this sound like a servo problem?

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Unread 03-29-2013, 07:55 AM   #2
zjosh93
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1993 ZJ 
 
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I had a similar problem with mine. Started out that cruise would cut out randomly then stopped working altogether. Turned out to be a bad brakelight switch. The contacts for the cruise control are separate from the ones for the brake lights so your lights can work fine while the cruise thinks you are hitting the brakes all the time. Took the switch apart and found the issue, tried to fix the switch but ended up just buying a new one. Mine is a 93 so YMMV. Also I see you replaces switches but I took that as the on/off switch, if you already checked the brake switch never mind.
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Unread 03-29-2013, 07:59 AM   #3
KoreaZJ
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Verify switches and clock spring... Measure resistance between clock spring connector Pins #1 and #2 with switches in positions shown in table below...
  1. First disconnect the negative battery cable, wait a few minutes for circuits to discharge
  2. Remove steering column lower shroud cover
  3. Remove the clock spring connector (white)
  4. Check cruise switch operation with an ohmmeter between Clockspring side Pin#1 (PK) and Pin#2 (BK/LB).






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Unread 03-29-2013, 08:03 AM   #4
MN59ZJ
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Thanks! Yeah, I meant the on/off switch. Would this prevent the cruise light on the instrument cluster from lighting up?
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Unread 03-29-2013, 08:03 AM   #5
McCloudsZJ
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I have a niner like yours. Mine was a dirty contact in the switch. This is what fixed it for me:

Quote:
Originally Posted by Foundrydude View Post
Spray behind all the cruise switches with electrical contact cleaner, then work the heck out of em. Repeat two or three times. Allow to dry for several hours before powering up.
If you don't think that's it, break out the multimeter and start trouble shooting

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Unread 03-29-2013, 08:04 AM   #6
KoreaZJ
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Quote:
Originally Posted by MN59ZJ View Post
I meant the on/off switch. Would this prevent the cruise light on the instrument cluster from lighting up?
PCM reads the switch, then toggles the lamp.

Not a simple ON/OFF switch. Uses resistor multiplexing where each value has a different meaning to the PCM.
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Unread 03-29-2013, 08:06 AM   #7
MN59ZJ
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Quote:
Originally Posted by KoreaZJ
Verify switches and clock spring... Measure resistance between clock spring connector Pins #1 and #2 with switches in positions shown in table below...

[*]First disconnect the negative battery cable, wait a few minutes for circuits to discharge[*]Remove steering column lower shroud cover[*]Remove the clock spring connector (white)[*]Check cruise switch operation with an ohmmeter between Clockspring side Pin#1 (PK) and Pin#2 (BK/LB).

That looks like fun.
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Unread 03-29-2013, 09:34 AM   #8
dnuccio
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mine ended up being a broken vaccum line to the servo. replaced it and its been working ever since
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Unread 03-29-2013, 01:31 PM   #9
AVR2
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Quote:
Originally Posted by dnuccio View Post
mine ended up being a broken vaccum line to the servo. replaced it and its been working ever since
A broken vacuum line wouldn't show up as a problem to the PCM (it has no idea if the servo is getting vacuum or not), so you'd still get the cruise light on the dash. No cruise light means an electrical problem.
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Unread 03-29-2013, 07:37 PM   #10
dnuccio
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theres no cruise light that comes on on my ZJ

EDIT: just realized he has a 98, i have a 95. probably different
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Unread 03-29-2013, 07:39 PM   #11
zjosh93
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Yep the earlier ones don't have any light the later ones do.
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Unread 03-29-2013, 07:42 PM   #12
dnuccio
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Quote:
Originally Posted by zjosh93 View Post
Yep the earlier ones don't have any light the later ones do.
gotcha
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