Cadillac STS The newest installation of the performance sedan from Cadillac, having replaced the Seville

1999 STS Class 2 communications

  #1  
Old 12-08-2010, 06:54 PM
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Default 1999 STS Class 2 communications

I drive the car to work 25 min- after 4 hours battery voltage is down to 9.2 needs boost.
Drive home park in garage 14 hours - battery voltage fine. Has done this every day for about a week.
First thing I see happen is fuel guage goes to empty (after about 20 min of driving)
other things begin to happen - interior lights (on door switches go off
-temp gauge goes to cold.
-amp quits (radio display stays on)
-doors wont lock
-doors wont unlock
-instrument panel goes black and then reinitalizes
-damper relay under back seat chatters (when key off)
-many DTC's mainly UXXXX (communications)
Car has always run fine while these things happen, critical systems never fail.
I have cleaned many of the grounds
Can anyone help?
 
  #2  
Old 12-13-2010, 08:14 PM
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Check E- ghost tread in FAQ. I am guessing you have already verified battery is good. You will need to post the codes from all the modules, also is car stock - no mods?
 
  #3  
Old 12-31-2010, 03:02 PM
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The battery is good and there are no mods.

The latest codes are as follows:

ABS C1283 Excessive Time to Center Steering
DDM B1983 Device Power 1 Circuit Low
DDM U1255 Class 2 Initialization Error
DDM U1066 Loss of Communications with RIM
DIM B1983 Device Power 1 Circuit Low
IPC B1652 Loss of Keep Alive Memory (KAM)
IPC B1982 Device Power 1 Circuit High
IPC B1652 Loss of Keep Alive Memory (KAM)
IRC B1760 Driver seat Asm Rearward Switch Malf
IRC B1983 Device Power 1 Circuit Low
IRC U1129 Loss of Communications with AMP
IRC U1065 Loss of Communications with IPM
IRC U1160 Loss of Communications with DDM
IRC U1016 Loss of Communications with PCM
PCM P603 Control Module Long Term Memory Reset
PCM P741 TCC System Stuck Off
RIM B1327 Battery/Source Voltage Low
RIM U1255 Class 2 Initialization Error
SDM B1147 Driver Side Air Bag System Malf
SDM B1148 Passenger Side Air Bag System Malf
SDM B1327 Battery/Source Voltage Low
VTD B1327 Battery/Source Voltage Low
MSM B1327 Battery/Source Voltage Low
MSM B1860 Driver Lumbar Vert Sensor CKT Malf
MSM B2355 Driver Front Vertical Sensor Malf
MSM U1160 Loss of Communications with DDM

Some of these codes have never come up before, such as the driver seat codes.
Usually the first sign of a problem is the fuel guage going to zero than comming back again, then the electric door locks quit working.
If I disconnect the negative from the battery overnight, I can go up to four days without a problem.

Also do you know how to read these codes with an ELM327 PC based code reader, what is the hex command to send.
 

Last edited by dmicallef; 12-31-2010 at 03:06 PM.
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