Here is my problem, and I really hope someone can help. I have a 92 STS with analog gauges (computer driven I think) with the digital info center and digital climate controls. When it gets hot outside (80+) and I go to start the car the dash does not "turn on". The car starts, runs, and drives fine. Also the radio will work (volume, change channels, etc) dut the display does not work. The worst part is that the front window defrost turns on full hot and I cant turn it off (remember it is over 80 out). It's almost like the dash does not realize the car (or ignition) is turned on. As soon as it cools down outside everyting goes back to normal. Any ideas?

Its a bad IPC/cluster.....or one of the computers on the car is corrupting the data on the UART data line circuit 800.

These can be very hard to find if intermitant. My '93 took two weeks to pinpoint the cluster. I found if I pressed and held the cluster harness plug in a certain way for 30 seconds....I could induce the failure mode. Bad cluster/IPC.

The GM/Delco cluster diagnostic terminals appear to not test circuit 800 failures. My cluster tested 'OK.' To them '--' is a normal OK mode. I had to show the failure mode in the car to the Delco tech. He was like ......oh crap.....we dont test for that.

So...in some cases its taking 3-4 'rebuilt' clusters to clear up the 'loss of data', defrost lamp, '--' error, failure mode.

The IPC/cluster is $300 exchange from Delco radio/speedometer repair shops.



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