Diagnostic Instructions
DTC Descriptors
DTC B3064: RF/LF Door Key Lock Switch Circuit Low
DTC B3069: RF/LF Door Key Unlock Switch Circuit Low
Circuit/System Description
The key cylinder unlock feature will unlock all of the doors when the body control module (BCM) receives a KEYUNLK input signal for greater than 1 second. This feature is disabled from the factory and can be enabled using a scan tool. If the BCM
detects this circuit is shorted to ground, DTC B3064 or B3069 is set.
Conditions for Running the DTC
Battery voltage must be between 9-16 volts.
Conditions for Setting the DTC
B3064
The BCM detects the door lock key switch lock signal circuit is shorted to ground.
B3069
The BCM detects the door lock key switch unlock signal circuit is shorted to ground.
The conditions above must be present for more than 60 seconds.
Action Taken When the DTC Sets
| • | The BCM stores the DTC to memory. |
| • | The door lock actuators will not lock or unlock. |
Conditions for Clearing the DTC
| • | This DTC will change from current to history when the fault is no longer present. |
| • | A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present. |
| • | The technician issues a scan tool CLEAR DTCs command. |
Reference Information
Schematic Reference
Door Lock/Indicator Schematics
Connector End View Reference
Description and Operation
Power Door Locks Description and Operation
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
Ignition ON, observe the scan tool Door Lock switch parameters while pressing both the door lock and door unlock switches. The reading should change between ON and OFF.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the driver door lock cylinder switch.
- Test for less than 1 ohm of resistance between the ground circuit terminal A and ground.
| ⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
- Ignition ON, verify the scan tool Door Unlock Switch is Inactive
| ⇒ | If not the specified value, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the BCM. |
- Install a 3-amp fused jumper wire between the signal circuit terminal B and ground, verify the scan tool Door Unlock Switch is Active.
| ⇒ | If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM. |
- If all circuits tests normal, replace the driver door lock cylinder switch.
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
