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