Anyone out there fmiliar with the fix for this please help. i have tested voltage to the bus wire yellow/violet at the harness for the cluster and it is active and reads between 0.27-0.74v also the ground to cluster is fine. In dire need to get this truck out of my hair, any help would be greatly apprechiated. thanks in advance.
I guess you are working FSM free (no book) on this complex car?
the factory service manual tells you what the steps are.....
and what the codes mean, and what checks to do ....
fuses are first.
reseat modules 2nd. (related)
are those all DTC errors. or just 1. of many."?
using what scan tool. does your tool show all jeep codes.
like the Innova 3160 does.?? or is your tool 1/2 brain dead... as many are.
one code. answer.....s..
first lets try to understand this code. (DTC)
which engine? 4.0L or 4.7L?
this error , i think does not mean both key FOBS are dead
but did you try both... car came with both.????/
But....
it means the SKIM is not talking, (check all fuses with a voltmeter.
not just gandering at them......????) key on, test.
that be first. 12vdc on both sides of fuses, means they are really good.
it can also mean the Data buss is dead. PCI buss. its called.
The factory scan tool can see this data and we can see
if the data is Dead, or garbled or is never even sent.
you cant do that.... so...... its palm hits head moment.
if you had a real scan tool , and say lots of P1, P2, or other Jeep codes about PCI buss failure, i'd suspect that PCI has problems.
but if not, then just the SKIM is dead.
there are 7 computers on that buss. even the RADIO and BCM
if the bus has issues, the BCM will throw lots of errors.
Seems to me the SKIM is bad, or both keys bad.
i dont think this error is key related. but gee, you have 2, to try...
and takes 5min work....
No Cluster Bus Messages
Print this code data
Trouble Code Conditions:
Key on or engine running; and the PCM determined that it did not receive any Security Key Bus Messages over the Data Bus line for 20 seconds. This malfunction may be an intermittent problem.
Possible Causes:
that is all i know on this from DIY , perspective......
SOURCE: Code P1687
p1687 is for no cluster bus message...this could mean a bad cluster....wiring to the cluster ...or a bad pcm...u should take it to a reputable repair facility for further diagnostics
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Hi, You must use a volt meter on D.C. current to identify the hot wire. Car wiring is different than household. Any given color may be hot. So key on, lights on. and use a volt meter. Use voltmeter red probe for hot and touch black to any body ground. If shows voltage in D.C. Volt Meter in this manner that is your hot wire. On my SUV the hot was the white waire at the backup light circuit as the tail lamp.
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