Diagnostic Aids
The key cylinder switch, also known as the door cylinder switch, is a built in part of the door lock actuator. It is connected, by means of a mechanical rod, to the door lock cylinder, which is mounted to the exterior of the door. In order to unlock the vehicles doors, the key cylinder switch is activated by inserting the door key into the door lock cylinder and turning to the unlock position. The door key can either be turned and held to the unlock position for 3-5 seconds, or turned to the unlock position twice within 3-5 seconds in order to activate the feature. For more information concerning the Key Cylinder Switch and its function, refer to the Central Door Unlock section of the Power Door Locks Description and Operation .
Two ground circuits are included in the harness connector of the door lock actuator. Where it is necessary to connect a fused jumper wire between the door cylinder switch signal and ground circuits of this connector, be sure to use the ground circuit of the door cylinder switch. Connecting the switch signal circuit to the inappropriate ground circuit of the harness connector may result in misdiagnosis.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Door Lock/Indicator Schematics DEFINITION: The doors do not unlock when using the Central Door Unlocking feature. This test assumes that all DTCs have been diagnosed. | |||
1 | Did you perform the Door Systems Diagnostic System Check? | Go to Step 2 | |
2 |
Does the scan tool display Idle? | Go to Step 3 | Go to Step 4 |
3 |
Does the scan tool display Unlock? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 5 |
4 |
Important:: Ensure that the linkage between the outside door lock cylinder and the door lock actuator containing the door cylinder switch is not stuck or binding.
Does the scan tool display Idle? | Go to Step 11 | Go to Step 7 |
5 |
Important:: Ensure that the linkage between the outside door lock cylinder and the door lock actuator containing the door cylinder switch is not loose or unfastened.
Does the Door Cylinder Sw parameter display Unlock? | Go to Step 6 | Go to Step 8 |
6 |
Does the Door Cylinder Sw parameter display Unlock? | Go to Step 11 | Go to Step 9 |
7 | Test the door cylinder switch signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 14 | Go to Step 10 |
8 | Test the door cylinder switch signal circuit for a high resistance, an open, or a short to B+. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 14 | Go to Step 10 |
9 | Test the appropriate door cylinder switch ground circuit for an open, or a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 14 | Go to Step 10 |
10 | Inspect for poor connections at the appropriate door module harness connector. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 14 | Go to Step 12 |
11 | Inspect for poor connections at the appropriate door cylinder switch harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 14 | Go to Step 13 |
12 | Replace the appropriate door module. Refer to Door Control Module Replacement . Did you complete the replacement? | Go to Step 14 | -- |
13 | Replace the appropriate door lock actuator. It contains the door cylinder switch. Refer to Front Side Door Latch Replacement . Did you complete the replacement? | Go to Step 14 | -- |
14 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 2 |
