No keep alive memory ac control & clock/1991 olds 98

Ford Taurus model???
this is for ford T 2000
p1633 keep alive memory test failure

If your asking about the radio channels and radio clock, there is a wire that is always hot that has to be connected to the radio's always alive wire. If it is not hooked to the wire that is always hot, (like hooked to an ignition wire) then it will not be hot and every time the ignition is turned off, you will lose the clock time and channels memory. If you have a test light, check the wires at the radio (with the key off) and see which one is hot. If none are hot, then you have a blown fuse or wire broken.

Hi Eugene, My suggestion is to inspect the constant power line into the ignition switch. Regards John

you have lost constant power to it.everytime you key on it resets to 12:00. that means everytime you key off you cut keep alive power to clock,make sure fuse is ok,wiring is ok.

When the ignition is off, the computer will draw a very few milliamps of power for the keep alive memory, just like your clock and radio pre-sets. If the memory is lost as when battery is disconnected, the computer has to relearn certain functions related to the particular wear patterns of your engine and drivetrain-it has to relearn how to set optimum fuel requirements and ignition advance based on how your engine runs.
The circuit for this keep alive memory is called Ignition Off Draw, or IOD. There should be a small fuse, 10 or 15 amp, in the circuit, probably in the under hood fuse block. See if your fuse is good for it.

You are loosing power to the keep alive memory circuit of the radio. I think you may have a defective ignition starter switch. Also there are two hot wires to the radio, one powers the radio, one holds memory and is called the Keep Alive Memory constant power wire. Here is the wiring colors, pull the radio and check the memory power supply wire.
Radio Constant (keep alive memory) 12V+ Wire: Light Green/Purple wire

Ford Ranger/Explorer/Mountaineer 1991-1999
Clearing Codes

• CONTINUOUS MEMORY CODES
• KEEP ALIVE MEMORY

Print

CONTINUOUS MEMORY CODES

These codes are retained in memory for 40 warm-up cycles. To clear the codes for the purposes of testing or confirming repair, perform the code reading procedure. When the fault codes begin to be displayed, de-activate the test by either disconnecting the jumper wire (meter, MIL or message center) or releasing the test button on the hand scanner. Stopping the test during code transmission will erase the Continuous Memory. Do not disconnect the negative battery cable to clear these codes; the Keep Alive memory will be cleared and a new code, 19, will be stored for loss of PCM power.

KEEP ALIVE MEMORY

The Keep Alive Memory (KAM) contains the adaptive factors used by the processor to compensate for component tolerances and wear. It should not be routinely cleared during diagnosis. If an emissions related part is replaced during repair, the KAM must be cleared. Failure to clear the KAM may cause severe driveability problems since the correction factor for the old component will be applied to the new component.
To clear the Keep Alive Memory, disconnect the negative battery cable for at least 5 minutes. After the memory is cleared and the battery reconnected, the vehicle must be driven at least 10 miles so that the processor may relearn the needed correction factors. The distance to be driven depends on the engine and vehicle, but all drives should include steady-throttle cruise on open roads. Certain driveability problems may be noted during the drive because the adaptive factors are not yet functioning

b120 121 & 122 are a twilight delay & panel dimming codes. Probably a problem with the switch. b 441 is a cooling fans problem. b 552 is caused when the battery cables have been disconnected or power loss to the ECM. Keep alive memory error.

P0603 means Internal Control Module Keep Alive Memory (KAM) Error

In other words, that code is set when the PCM loses "keep alive" memory B+.

This code can also be set if the batteries went dead at some point, but mainly it means there is an open circuit detected in the KAM circuit.

On a '97 F-250, check for a 5 amp fuse blown in fuse cavity #2. If the fuse is blown, check for and repair the short-to-ground in circuit #729 (red with white coloured wire).

Good luck dear.

Rate this.

all on the same circuit. radio has two power supplys, one when the key on, and one all the time. aftermarket decks draw alot more than factory and this circuit may not be able to handle the extra load. look in owners manual and look in engine and interior fuse panels. it may say memory,clock,ecm keep alive etc. if need be check them all one is failed. now as for the engine light, most obdII vehicles use this circuit to keep computer memory alive... it will set a code for voltage lost. if you know your not overloaded or have a short, then its safe to go up to next size fuse,2.5 or 5 amp heavier. but thats it. if keeps happening you have a short or you may have to run a dedicated feed circuit for the deck. good luck youll find it