Circuit Description
The RH door key switch circuit provides input to the RH Door Control Module (RDCM) when the RH door key switch is rotated the UNLOCK position. This input allows the RDCM to detect when the door is unlocked. This information is sent on the serial data line and used by other systems to execute certain functions (UTD, Illuminated entry, hatch release, etc.). The RDCM provides both power and ground to the RH door key switch. When the RH door key switch is rotated the UNLOCK position, a ground is supplied through the RH door key switch to the RH door key switch input which is pulled low. When the RDCM detects low voltage on the RH door key switch input, the RDCM will UNLOCK the passenger door and will also send a message on the serial data line to the LH Door Control Module (LDCM) to UNLOCK the driver door. The RDCM monitors the RH door key switch signal circuit and determines how long a ground (switch activated) has been applied. If the ground is applied for longer than expected, a malfunction is present and a DTC will set.
Conditions for Setting the DTC
| • | The RDCM detects a low voltage level (short to ground) at the RH door key switch signal circuit. |
| • | Condition must be present for 20 seconds. |
Action Taken When the DTC Sets
| • | Stores a history DTC B2253 in the RDCM memory. |
| • | This DTC can only be set as a history code even if the malfunction is current. |
| • | No driver warning message will be displayed for this DTC. |
Conditions for Clearing the DTC
| • | The RDCM no longer detects a low voltage level (short to ground) at the RH door key switch signal circuit for longer than 20 seconds. |
| • | Use the IPC clearing DTCs feature. |
| • | Use a scan tool. |
Diagnostic Aids
| • | The following conditions may cause an intermittent malfunction: |
| - | There is an intermittent short to ground in the RH door key switch signal circuit. |
| - | The RH door key switch is shorted to ground internally or is sticking. |
| - | The RH door key switch was activated for longer than 20 seconds. |
| • | Using a scan tool, select RDCM inputs and monitor the Door Key Unlock Switch status. If the scan tool displays ACTIVE, disconnect the RH door key switch and check if the Door Key Unlock Switch status changes to INACTIVE. If the Door Key Unlock Switch status changed, then replace the RH door key switch. If the Door Key Unlock Switch status did not change, then check RH door key switch signal circuit for a short to ground. |
| • | If the DTC does not reset after the code is cleared, then the problem may be intermittent. Perform the tests shown while moving related wiring and connectors. This can often cause the malfunction to occur. Refer to Intermittents and Poor Connections . |
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
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Tests for the normal state of the RH door key switch using a scan tool. The scan tool will display the normal state as INACTIVE, and ACTIVE when the switch is activated.
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Tests if the RH DCM is able to detect a change in RH door key switch state. The scan tool will display the normal state as INACTIVE, and ACTIVE when the switch is activated.
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Tests for a stuck or shorted RH door key switch. If the RH door key switch is stuck or shorted, the state will change from ACTIVE to INACTIVE when the RH door key switch is disconnected.
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Tests for a short to ground in the RH door key switch signal circuit.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Power Door Systems Diagnostic System Check? | -- | Go to Step 2 | |
Does the scan tool display INACTIVE? | -- | Go to Step 3 | Go to Step 4 | |
Does the Door key Unlock Switch parameter change state? | -- | Go to Diagnostic Aids | Go to Step 4 | |
Does the scan tool display INACTIVE? | -- | Go to Step 7 | Go to Step 5 | |
Test the signal circuit of the RH door key switch 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 10 | Go to Step 6 | |
6 | Inspect for poor connections at the harness connector of the RH DCM. 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 10 | Go to Step 8 |
7 | Inspect for poor connections at the harness connector of the RH door key switch. 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 10 | Go to Step 9 |
8 | Replace the RH DCM. Refer to Door Control Module Replacement . Did you complete the replacement? | -- | Go to Step 10 | -- |
9 | Replace the RH door key switch. Refer to Door Lock Replacement . Did you complete the replacement? | -- | Go to Step 10 | -- |
10 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
