Circuit Description
The RH door switch circuit provides input to the RH Door Control Module (RDCM) when the switch is pressed to the LOCK or UNLOCK position. This input allows the RDCM to detect a door LOCK or UNLOCK request. The RDCM provides both power and ground to the door lock and unlock switches. When the RH door LOCK switch is pressed, a ground is supplied through the RH door switch to the RH door lock switch signal which is pulled low. When the RDCM detects low voltage on the RH door lock switch input, the RDCM will LOCK the RH door and also send a message on the serial data line to the LH Door Control Module (LDCM) to LOCK the LH door. When the RH door UNLOCK switch is pressed, the RDCM will unlock the RH door and also send a second message on the serial data line to the LDCM to UNLOCK the LH door. The RDCM monitors both the RH door lock and unlock switch signal circuits and determines how long a ground (switch pressed) 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 unlock switch signal circuit. |
| • | Condition must be present for 20 seconds. |
Action Taken When the DTC Sets
| • | Stores a history DTC B2239 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 unlock 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 unlock switch signal circuit. |
| - | The RH door unlock switch is shorted to ground internally or is sticking. |
| - | The RH door unlock switch was pressed for longer than 20 seconds. |
| • | If RH door unlock switch signal circuit is shorted to ground or the RH door unlock switch is stuck closed, the RDCM and LDCM will continuously unlock both doors. |
| • | Using a scan tool, select RDCM inputs and monitor the Door Unlock Switch status. If the scan tool displays ACTIVE, disconnect the door unlock switch and check if the Door Unlock Switch status changes to INACTIVE. If the Door Unlock Switch status changed, then replace the door unlock switch. If the Door Unlock Switch status did not change, then check the RH door unlock 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 unlock 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 unlock 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 unlock switch. If the RH door unlock switch is stuck or shorted, the state will change from ACTIVE to INACTIVE when the RH door unlock switch is disconnected.
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Tests for a short to ground in the RH door unlock 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 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 unlock 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 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 switch. Refer to Front Door Switch Replacement . Did you complete the replacement? | -- | Go to Step 10 | -- |
10 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
