DTC B3064 or B3069. Buick Rendezvous

For 1990-2009 cars only

Makes 🢒 Buick 🢒 2006 🢒 Rendezvous - AWD 🢒 Accessories 🢒 Navigation Systems 🢒 DTC B3064 or B3069

DTC Descriptor

DTC B3064: RF/LF Door Key Lock Switch Circuit Low

DTC B3069: RF/LF Door Key Unlock Switch Circuit Low

Diagnostic Fault Information

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

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

DTC B3064

The BCM detects the Door Lock Key Switch Lock Signal circuit is shorted to ground.

DTC 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

•	Power Door Systems Connector End Views

•	Computer/Integrating Systems Connector End Views

Description and Operation

Power Door Locks Description and Operation

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

Scan Tool Reference

•	Scan Tool Data List

•	Scan Tool Data Definitions

•	Scan Tool Output Controls

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 1.0 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.

•	Door Lock Cylinder Replacement

•	Control Module References for BCM replacement, setup and programming