Chrysler 300M 2002 Service Manual page 280

LH
BATTERY (Continued)
an open-circuit voltage reading of 12.4 volts or
greater, it may be load tested to reveal its cranking
capacity (Refer to 8 - ELECTRICAL/BATTERY SYS-
TEM/BATTERY - STANDARD PROCEDURE).
OPEN CIRCUIT VOLTAGE TABLE
Open Circuit Voltage
11.7 volts or less
12.0 volts
12.2 volts
12.4 volts
12.6 volts or more
STANDARD PROCEDURE - IGNITION-OFF
DRAW TEST
The term Ignition-Off Draw (IOD) identifies a nor-
mal condition where power is being drained from the
battery with the ignition switch in the Off position. A
normal vehicle electrical system will draw from five
to thirty-five milliamperes (0.005 to 0.035 ampere)
with the ignition switch in the Off position, and all
non-ignition controlled circuits in proper working
order. Up to thirty-five milliamperes are needed to
enable the memory functions for the Powertrain Con-
trol Module (PCM), digital clock, electronically tuned
radio, and other modules which may vary with the
vehicle equipment.
Module
Radio
Audio Power
Amplifier
Central Timer Module
(CTM)
Powertrain Control
Module (PCM)
ElectroMechanical
Instrument Cluster
(EMIC)
Combination Flasher
(2) Determine that the underhood lamp is operat-
ing properly, then disconnect the lamp wire harness
connector or remove the lamp bulb.
Charge Percentage
0%
25%
50%
75%
100%
ELECTRONIC MODULE IGNITION-OFF DRAW (IOD) TABLE
Time Out?
(If Yes, Interval And Wake-Up Input)
No
No
No
No
No
No
A vehicle that has not been operated for approxi-
mately twenty days, may discharge the battery to an
inadequate level. When a vehicle will not be used for
twenty days or more (stored), remove the IOD fuse
from the Junction Block (JB). This will reduce bat-
tery discharging.
Excessive IOD can be caused by:
• Electrical items left on.
• Faulty or improperly adjusted switches.
• Faulty or shorted electronic modules and compo-
nents.
• An internally shorted generator.
• Intermittent shorts in the wiring.
If the IOD is over thirty-five milliamperes, the
problem must be found and corrected before replac-
ing a battery. In most cases, the battery can be
charged and returned to service after the excessive
IOD condition has been corrected.
(1) Verify that all electrical accessories are off.
Turn off all lamps, remove the ignition key, and close
all doors. If the vehicle is equipped with an illumi-
nated entry system or an electronically tuned radio,
allow the electronic timer function of these systems
to automatically shut off (time out). This may take
up to three minutes. See the Electronic Module Igni-
tion-Off Draw Table for more information.
milliamperes
up to 1
milliampere
milliamperes
(max.)
0.95 milliampere
0.44 milliampere
0.08 milliampere
(3) Disconnect the battery negative cable.
BATTERY SYSTEM 8F - 11
IOD After Time
IOD
Out
1 to 3
N/A
N/A
4.75
N/A
N/A
N/A
N/A