Circuit Description (Domestic)
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 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. For more detailed information concerning power door lock operation refer to Power Door Locks Description and Operation .
DTC Descriptors
This diagnostic procedure supports the following DTCs:
| • | DTC B3062 Front Door Key Lock Switch Circuit |
| • | DTC B3067 Front Door Key Unlock Switch Circuit |
DTC Symptom | DTC Symptom Descriptor |
|---|---|
02 | Short to Ground |
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 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 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. |
Diagnostic Aids
An intermittently sticking key cylinder switch can cause this DTC to set. Thoroughly inspect the wiring and connectors. An incomplete inspection of the wiring and connectors may result in misdiagnosis causing part replacement with the reappearance of the malfunction. If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections .
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Door Lock/Indicator Schematics Connector End View Reference: Vehicle Access Connector End Views | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
2 |
Does the scan tool display Idle? | Go to Step 3 | Go to Step 4 |
3 |
Does the Key Cylinder Switch parameter change to the unlock state? | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 4 |
4 |
Does the scan tool display Idle? | Go to Step 7 | Go to Step 5 |
5 | Test the driver door key switch signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 10 | Go to Step 6 |
6 | Inspect for poor connections at the DDM harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 10 | Go to Step 8 |
7 | Inspect for poor connections at the driver door latch assembly harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 10 | Go to Step 9 |
8 | Replace the DDM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 10 | -- |
9 | Replace the driver door latch assembly. Refer to Front Side Door Outside Handle Replacement . Did you complete the replacement? | Go to Step 10 | -- |
10 |
Does the DTC reset? | Go to Step 2 | System OK |
