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service bulletin 08-15-99 deals with erratic cluster operation and involves checking and cleaning the BUS connections and soldering in a new patch harness. Check with local dealer for a copy or may find it online. This will be the most likely cause.
CODE P1687 - NO CLUSTER BUS MESSAGE. POSSIBLE CAUSES DATA BUS CIRCUIT SKIM TO PCM IS DAMAGED OR ITS IS OPEN. PCM UNABLE TO COMMUNICATE WITH THE BODY CONTROL MODULE. PCM HAS FAILED OR THE SKIM IS DAMAGED OR HAS FAILED.
remove the cluster clean contacts with dielectric spray then apply dielectric grease to connectors and reinstall if this doesnt help you need a cluster
my 99 jeep wrangler has the same problem when I had it looked at they told me its a chrysler problem and there is nothing wrong and there is a short under the dash I had them reset the warning light for an emissions test but the light came back on in a few days. It was not worth the expense to try and find the short
There's a defect with them. I have a 1999 and the gauges and dash lights will go off and a "no bus" message will appear where the Odometer displays. If I push on both sides of the Dash they will come back. It seems to be a Ground Problem. I don't know how to fix it yet, however I was told for about $400.00 the Dash can be removed and the problem repaired by the Dealer.
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