If your gas door, rear door windows and locks including the 5th door or trunk lid lock fail to open or any combination of the above or just the fuel gauge acts erratic then the REM, Rear Electronic Module has gone to sleep and will not wake up. A complete REM reload is needed. Volvo will not pay for this if your cars is out of the origional factory warranty.
Below is the Tech Net Note.
NO: 37-08
DATE: 11/15/2001
MODEL: S60, V70, V70XC, and S80
SUBJECT: REM in Sleep mode, DTC CEM-1A5A
After the ending chassis number, the car has the
updated Software from the factory.
Type Model MY Plant Chassis.
184 S80 00-01 1 116811 - 239999
285 V70 01 1 000257 - 170999
285 V70 01 2 000257 - 170999
295 V70 XC 01 1 000160 - 047999
384 S60 01 2 000148 - 092351
DESCRIPTION:
The REM may not "wake-up" when unlocking a vehicle. When the REM is locked-up, the REM functions will not operate. REM functions which are affected include: REM communication, rear door central locking function, remote trunk lid lock function, fuel lid lock function, rear wiper/washer function, fuel gauge value. DTC CEM-1A5A will also be set.
The above listed functions will return if the REM fuse 1 is removed and re-installed.
NOTE: Using the remote vehicle key will allow the operator to unlock/lock the front door and allow unlocking/locking of the trunk assembly.
SERVICE:
If the above description is consistent with a customer complaint, Reload of the
complete REM system is needed. The software is updated so the REM does not
go to sleep again.
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BD