Chart 3 - B3109 Keyless Entry Transmitter Low Battery

Diagnostic Chart 3:

The body control module (BCM) will set DTC B3109 - Keyless Entry Transmitter Low Battery - when the transmitter battery voltage is below 2.5 Volts. Nominal battery voltage is 3.0 Volts.

DTC Parameters
^ Transmitter battery voltage less than 2.5 Volts
^ Transmitter low battery bit is set

Diagnostic AIDS
^ It is not recommended to test the transmitter battery with a digital volt-ohm meter (DVOM) or digital multi-meter (DMM). These meters do not give an accurate indication of battery condition as they do not test the battery under load.
^ When in doubt, replace battery with Panasonic CR2032 or equivalent.
^ DTC 3109 will set as a current code when a transmitter with a low battery condition has been activated in the current ignition cycle. The current code status will become a history code if a transmitter with a good battery is activated in the same ignition cycle.