B3067
DTC B3062 or B3067
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
DTC Descriptors
DTC B3062 02
- Front Door Key Lock Switch Circuit Short to Ground
DTC B3067 02
- Front Door Key Unlock Switch Circuit Short to Ground
Diagnostic Fault Information
Circuit/System Description
The driver door key switch is contained within the driver door latch assembly. The driver door key cylinder switch contacts, which are normally open, receive a constant ground via the G200 ground circuit. When the door key is turned to unlock, the switch contacts close and the driver door module (DDM) detects a switched ground. The DDM sends a message via GMLAN serial data to the remote control door lock receiver (RCDLR), indicating the key cylinder unlock switch request. The RCDLR is the master of all lock and unlock operations. If the RCDLR determines that the key cylinder unlock switch request is valid and conditions are correct for the door modules to perform the unlock function, it sends a message via GMLAN serial data back to all door modules to unlock all doors.
Conditions for Running the DTC
* The DDM must be powered.
* DTC B1325 Battery Voltage Out of Range, must not be current.
Conditions for Setting the DTC
The DDM detects that the driver door key lock/unlock switch is closed for more than 30 continuous seconds.
Action Taken When the DTC Sets
The DDM ignores inputs from the driver door key cylinder switch until the switch changes state.
Conditions for Clearing the DTC
* The condition responsible for setting the DTC no longer exists.
* You issue a scan tool CLEAR DTCs command.
* A history DTC will clear once 40 consecutive malfunction free ignition cycles have occurred.
Reference Information
Schematic Reference
Door Lock/Indicator Schematics (Door Lock/Indicator Schematics)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
* Power Door Latch Description and Operation (Description and Operation)
* Power Door Locks Description and Operation (Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning)
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the driver door latch assembly.
2. Ignition OFF, scan tool OFF, test for less than 10.0 ohms between the ground circuit terminal 8 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify the scan tool door cylinder switch parameter is IDLE.
• If not the specified value, test the signal circuit terminal 9 for a short to ground. If the circuit tests normal, replace the DDM.
4. Install a 3A fused jumper wire between the signal circuit terminal 9 and the ground circuit terminal 8. Verify the scan tool door cylinder unlock switch parameter changes to either UNLOCK or LOCK.
• If not one of the specified values, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the DDM.
5. If all circuits test normal, test or replace the driver door latch assembly.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Front Side Door Lock Replacement (Front Side Door Lock Replacement)
* Control Module References (Programming and Relearning) for DDM replacement, setup, and programming