B2805

Diagnostic Trouble Code (DTC) Chart:

Wiring Schematic:

CIRCUIT DESCRIPTION
The keyless entry system allows the driver to do the following functions from outside the vehicle by using a hand held radio transmitter:
^ Unlock the door locks. The courtesy lights activate automatically when using this function.
^ Lock the door locks.
^ Release the rear compartment lid.
^ Remote alarm.

The transmitter operates in the UHF band. The transmitter sends digitally coded signals to the Remote Control Door Lock Receiver (RCDLR) when pressing any of the transmitter buttons.

The RCDLR detects and decodes transmitter signals. For locking, unlocking, and remote alarm commands, the RCDLR sends command messages to the Body Control Module (BCM) to operate the door locks actuators, courtesy lights, and remote alarm.

The BCM has the ability to enable the transmitter programming/diagnostic mode. The BCM monitors messages on the RFA link to prevent message collisions. The BCM also receives programming signals from the RCDLR when attempting to enable transmitter programming/diagnostic mode.

CONDITIONS FOR SETTING THE DTC
1. The BCM receives the programming signals from the RCDLR when attempting to enable the transmitter programming/diagnostic mode.
2. The BCM expects to receive a program signal from the RCDLR and it does not after two tries.

ACTIONS TAKEN WHEN THE DTC SETS
^ The BCM stores DTC B2805 in memory.
^ The RCDLR does not enter transmitter programming/diagnostic mode.

CONDITIONS FOR CLEARING THE DTC
^ Under all fault conditions, the ignition switch must be cycled form off to on before this DTC can change from current to history.
^ A history DTC will clear after 100 consecutive ignition cycles if the condition for the fault is no longer present.
^ Using a scan tool.

DIAGNOSTIC AIDS
^ The following conditions may cause an intermittent malfunction to occur:
^ An intermittent open in circuit 917.
^ Poor connections at the BCM or the RCDLR.
^ The BCM is open internally.
^ The RCDLR is open internally.
^ The BCM checks for DTC B2805 only when attempting to enable transmitter programming/ diagnostic mode.
^ DTC P1626 will set in the Powertrain Control Module (PCM) when the ignition switch is on with the Body Control Module (BCM) disconnected. When BCM diagnostics and repairs are completed, refer to A Powertrain On Board Diagnostic (OBD) System Check for additional information on PCM related DTCs in Computers and Control Systems Testing.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
2. This step checks for communication between the BCM and the RCDLR when entering the transmitter programming/diagnostic mode.
3. This step checks if DTC B2805 resets when entering the transmitter programming/diagnostic mode.
4. This step checks for communication between the BCM and the RCDLR when using the keyless entry transmitter.
5. This step determines whether the RCDLR or the BCM is faulty.