Radio losing time when truck not running
#1
06-03-2010, 06:43 PM
Join Date: May 2010
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Radio losing time when truck not running
94 Dakota, V6, Magnum
Oem Radio works perfectly after better grounded. Except when truck not running and only on battery power. The time advances for approximately an hour then freezes at the point until the next starting. At that point the time and radio works perfectly. Cycle repeats.
My assumption is that there is enough power left in the radio to keep the time for an hour. This dissapates and there is no (or not enough) power to radio from battery alone.
The F2 radio memory fuse is intact.
Thanks in advance for any thoughts, suggestions or ideas!
94DakLover
Oem Radio works perfectly after better grounded. Except when truck not running and only on battery power. The time advances for approximately an hour then freezes at the point until the next starting. At that point the time and radio works perfectly. Cycle repeats.
My assumption is that there is enough power left in the radio to keep the time for an hour. This dissapates and there is no (or not enough) power to radio from battery alone.
The F2 radio memory fuse is intact.
Thanks in advance for any thoughts, suggestions or ideas!
94DakLover
#2
06-03-2010, 06:59 PM
Seriously though, thats a really odd problem!! There are two power wires to a radio... one is for memory when the truck is off, which keeps time and radio presets and the other is for power when the radio is on. Both power wires are ran off the truck's battery. So if the battery in your truck is good (has enough juice to start the engine), then it can't be a battery problem. If the truck's battery is bad, the radio should lose all memory. I've never heard of an inbetween situation like this!
#3
06-03-2010, 07:06 PM
Here is some useful info from the FSM...
IGNITION-OFF DRAW FUSE
All vehicles are equipped with an Ignition-Off
Draw (IOD) fuse that is removed when the vehicle is
shipped from the factory. This fuse feeds various accessories
that require current when the ignition
switch is in the OFF position, including the clock and
radio station preset memory functions. The fuse is removed
to prevent battery discharge during vehicle
storage.
The IOD fuse should be checked if the radio station
preset memory or clock functions are erratic or inoperative.
The IOD fuse is located in the Power Distribution
Center (PDC). See underside of PDC cover for
IOD fuse identification.Draw (IOD) fuse that is removed when the vehicle is
shipped from the factory. This fuse feeds various accessories
that require current when the ignition
switch is in the OFF position, including the clock and
radio station preset memory functions. The fuse is removed
to prevent battery discharge during vehicle
storage.
The IOD fuse should be checked if the radio station
preset memory or clock functions are erratic or inoperative.
The IOD fuse is located in the Power Distribution
Center (PDC). See underside of PDC cover for
DIAGNOSIS
RADIO
(1) Check fuse 12 in fuseblock module and fuse F2
in Power Distribution Center (PDC). If OK, go to
next step. If not OK, replace fuse.
(2) Check for battery voltage at fuse F2 in PDC. If
OK, go to next step. If not OK, repair circuit to cartridge
fuse F2 in PDC.
(3) Turn ignition switch to ON position. Check for
battery voltage at fuse 12. If OK, go to next step. If
not OK, repair circuit to ignition switch as required.
(4) Turn ignition switch to OFF position. Disconnect
battery negative cable. Remove instrument cluster
bezel. Remove radio, but do not unplug any
connections. Check for continuity between the radio
chassis and a good ground. There should be continuity.
If OK, go to next step. If not OK, repair radio
ground circuit as required.
(5) Connect battery negative cable. Turn ignition
switch to ON position. See Radio and Speaker Connectors
chart. Check for battery voltage at cavity 6 of
left (gray) radio connector. If OK, go to next step. If
not OK, repair circuit to fuse 12 as required.
(6) Turn ignition switch to OFF position. Check for
battery voltage at cavity 7 of left (gray) radio connector.
If OK, replace radio. If not OK, repair circuit to
fuse F2 in PDC as required.in Power Distribution Center (PDC). If OK, go to
next step. If not OK, replace fuse.
(2) Check for battery voltage at fuse F2 in PDC. If
OK, go to next step. If not OK, repair circuit to cartridge
fuse F2 in PDC.
(3) Turn ignition switch to ON position. Check for
battery voltage at fuse 12. If OK, go to next step. If
not OK, repair circuit to ignition switch as required.
(4) Turn ignition switch to OFF position. Disconnect
battery negative cable. Remove instrument cluster
bezel. Remove radio, but do not unplug any
connections. Check for continuity between the radio
chassis and a good ground. There should be continuity.
If OK, go to next step. If not OK, repair radio
ground circuit as required.
(5) Connect battery negative cable. Turn ignition
switch to ON position. See Radio and Speaker Connectors
chart. Check for battery voltage at cavity 6 of
left (gray) radio connector. If OK, go to next step. If
not OK, repair circuit to fuse 12 as required.
(6) Turn ignition switch to OFF position. Check for
battery voltage at cavity 7 of left (gray) radio connector.
If OK, replace radio. If not OK, repair circuit to
#4
06-03-2010, 08:18 PM
Join Date: May 2010
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Thank you all for excellent information! I have replaced F2 and 12 fuses as
precautions even though not blown. Interior lights do work, so I assume the F2 non- ignition power circuit is functional. The radio/clock does come on with full
illumination when the ignition circuit is activated.
Background info that I should have mentioned is last week I had radio usage,
signal, etc issues that were corrected by ground continuity correction. Suppose I may need to run a separate ground rather than just rotating the oem, existing flat wire cable ground approx 560 degrees? Maybe remove that bolt that attaches it to the frame, scratch/sandpaper surfaces and reinstall?
Another pending issue is the cruise control sometimes works and other times does not. Might be a ground issue there as well? Does the cruise ground bolt to the frame at the same location as the radio ground?
Thanks in advance for excellent help, pictures and thoughts!
94DakLover
precautions even though not blown. Interior lights do work, so I assume the F2 non- ignition power circuit is functional. The radio/clock does come on with full
illumination when the ignition circuit is activated.
Background info that I should have mentioned is last week I had radio usage,
signal, etc issues that were corrected by ground continuity correction. Suppose I may need to run a separate ground rather than just rotating the oem, existing flat wire cable ground approx 560 degrees? Maybe remove that bolt that attaches it to the frame, scratch/sandpaper surfaces and reinstall?
Another pending issue is the cruise control sometimes works and other times does not. Might be a ground issue there as well? Does the cruise ground bolt to the frame at the same location as the radio ground?
Thanks in advance for excellent help, pictures and thoughts!
94DakLover
#5
06-04-2010, 04:06 PM
Join Date: May 2010
Posts: 16
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Radio Update
Last evening completed another "round of securing ground"...
The location where the flat, braided metal ground wire attaches
under the dash was metal brushed/scraped to provide better ground.
The flat radio ground wire was also twisted from this end before securing.
Also both battery terminals removed and cleaned. As well as the
body ground of the battery wires. Consequently a temporarily rough ride until the computer re-learned the best settings...
The radio clock memory seems to have held the correct time overnight.
Thank you all for your humor, help and suggestions!
94DakLover
The location where the flat, braided metal ground wire attaches
under the dash was metal brushed/scraped to provide better ground.
The flat radio ground wire was also twisted from this end before securing.
Also both battery terminals removed and cleaned. As well as the
body ground of the battery wires. Consequently a temporarily rough ride until the computer re-learned the best settings...
The radio clock memory seems to have held the correct time overnight.
Thank you all for your humor, help and suggestions!
94DakLover
