For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: Door Lock/Indicator Schematics Connector End View Reference: Vehicle Access Connector End Views DEFINITION: The doors do not Unlock or Lock from the driver door key lock cylinder. This test assumes that all DTCs have been diagnosed.
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle
2 | Verify that the Power Door Locks Inoperative - Key Cylinder Switches concern is present. Does the Central Door Lock and Central Door Unlock systems operate as described in the Description and Operation? | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3
3 |

1. Install a scan tool.
2. Turn on the ignition switch, with the engine OFF.
3. With a scan tool, observe the Door Cylinder Switch parameter in the driver door module (DDM) data list.
4. If the vehicle is equipped with the Central Door Lock feature (export), insert the door key into the driver door lock cylinder, turn it to the Lock position and hold it there for 3-5 seconds.
5. If the door is equipped with the Central Door Lock Feature (Export), insert the door key into the driver door lock cylinder, turn it to the Unlock position and hold it there for 3-5 seconds.

Does the Door Cylinder Switch parameter change to the appropriate state as expected?

Go to Step 8

Go to Step 4

4 |

1. Turn OFF the ignition switch.
2. Disconnect the driver door latch assembly harness connector.
3. Turn on the ignition switch, with the engine OFF.
4. Connect a 3-amp fused jumper wire between the driver door key switch signal circuit at the driver door latch assembly harness connector and ground circuit.
5. With the scan tool, observe the Door Cylinder Switch parameter.

Does the Key Cylinder Switch parameters change to the appropriate state?

Go to Step 5

Go to Step 6

5 |

1. Connect a 3-amp fused jumper wire between the driver door key switch signal and ground circuit at the driver door latch assembly harness connector.
2. With the scan tool, observe the Door Cylinder Switch parameter.

Does the Key Cylinder Switch parameters change to the appropriate state?

Go to Step 7

Go to Step 9

6 | Inspect the driver door key switch signal for an open or a short to ground. Refer to Circuit Testing and Wiring Repairs Did you find and correct the condition? | Go to Step 12 | Go to Step 8
7 | Inspect for poor connection 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 12 | Go to Step 10
8 | Check for poor connections at the harness connector of the DDM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 12 | Go to Step 11
9 | Locate and repair an open or high resistance in the driver door latch assembly ground circuit. Refer to Wiring Repairs . Did you complete the repair? | Go to Step 12 | --
10 | Replace the driver door latch assembly. Refer to Front Side Door Lock Actuator Replacement . Did you complete the replacement? | Go to Step 12 | --
11 | Replace the DDM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | Go to Step 12 | --
12 | Operate the system to verify the repair. Did you correct the condition? | System OK | Go to Step 2