DTC B3069 may be caused by the key cylinder unlock switch or key cylinder unlock switch circuit. The switch, which is contained within the driver door lock actuator, and circuit are part of the central door unlock feature. The driver door module (DDM) supplies battery voltage to the key cylinder unlock switch, via the key cylinder unlock signal circuit, and ground via the ground circuit. The key cylinder unlock switch is operated by a mechanical linkage rod that is connected to the driver door lock cylinder mounted in the driver door.

The key cylinder unlock switch is normally in the open state and is closed by inserting the door key into the driver door lock cylinder and turning to the unlock position. If the driver door lock cylinder is held to the unlock position for 3 seconds or longer, or turned to the unlock position twice within 3 seconds, the DDM detects the flow of voltage through the key cylinder unlock switch as an input signal to unlock all doors. The DDM sends a serial data class 2 request to unlock all doors to the rear integration module (RIM), which is the master of all lock/unlock operations. If the RIM determines that conditions are correct for all doors to be unlocked, it sends a serial data class 2 message back to each door module to unlock all doors. All doors then simultaneously unlock.

DTC B3064 may be caused by the key cylinder lock switch or key cylinder lock switch circuit. The switch, which is contained within the driver door lock actuator, and circuit are part of the central door lock feature. The DDM supplies battery voltage to the key cylinder lock switch, via the key cylinder lock signal circuit, and ground via the ground circuit. The key cylinder lock switch is operated by a mechanical linkage rod that is connected to the driver door lock cylinder mounted in the driver door.

The key cylinder lock switch is normally in the open state and is closed by inserting the door key into the driver door lock cylinder and turning to the lock position. The DDM detects the flow of voltage through the key cylinder lock switch as an input signal to lock all doors. The DDM sends a serial data class 2 request to lock all doors to the RIM, which is the master of all lock/unlock operations. If the RIM determines that conditions are correct for all doors to be locked, it sends a serial data class 2 message back to each door module to lock all doors. All doors then immediately lock.

On export vehicles that also have the door lock deadbolt feature, if the driver door lock cylinder is held to the lock position for 3 seconds or longer, or turned to the lock position twice within 3 seconds, all doors will also deadbolt. When the doors are deadbolted, they cannot be manually unlocked.

This diagnostic procedure supports the following DTCs:

The DDM must be powered and can not have B1327 Battery Voltage Low or B1328 Battery Voltage High set for the DTC to set.

If the DDM detects that the key cylinder unlock switch circuit is closed for more than 30 continuous seconds on a domestic vehicle, it sets DTC B3069.

If the DDM detects that the key cylinder lock switch circuit is closed for more than 30 continuous seconds on a export vehicle, it sets DTC B3064.

The DDM ignores signal inputs from this switch and stops sending messages to the RIM for it.

The DDM clears this DTC when the switch signal is no longer received, or when the vehicle ignition status changes from OFF to Run.

An intermittently sticking key cylinder switch can cause this DTC to set. Refer to Testing for Electrical Intermittents in Wiring Systems.

For more information on central door unlock, central door lock, deadbolting, and the key cylinder switches, refer to Power Door Locks Description and Operation .