Circuit Description
The RH Door Control Module (RDCM) provides the RH door lock and RH heated mirror control output functions. When the RDCM detects an active door LOCK or UNLOCK command from either the RH window switch, or from a LOCK or UNLOCK message was sent on the serial data line by the LH Door Control Module (LDCM), the RDCM will LOCK or UNLOCK the RH door. The RDCM accomplishes this by applying a ground or voltage to CKT 294 and CKT 295 depending on which command (LOCK or UNLOCK) was requested. The RDCM also controls the RH heated mirror functions by supplying a ground and voltage to the RH heated mirror. When the RDCM receives a message on the serial data line indicating the rear defogger was turned ON, the RDCM will activates the RH heated mirror by applying voltage to CKT 267. The RDCM monitors the voltage level and the amount of current draw on the RH door lock control circuit and the RH heated mirror control circuit. If the voltage level and/or current draw in either circuits are not within the acceptable range, a malfunction is present and a DTC will set.
Conditions for Setting the DTC
| • | The RDCM detects a high current or a short to voltage condition in the RH door lock control circuit when the RH door lock is activated |
| • | The RDCM detects a high current or short to voltage condition in the RH heated mirror control circuit when the RH mirror is activated (rear window defogger is ON). |
| • | Condition must be present for 150 ms. |
| • | The RDCM detects a voltage drop of 5 volts or more at battery 2 when the RDCM activates the RH door lock or the RH heated mirror. |
Action Taken When the DTC Sets
| • | Stores a history DTC B2277 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. |
| • | Disables all RH door lock or RH heated mirror functions depending on which circuit the RDCM detected the malfunction. |
Conditions for Clearing the DTC
| • | The rear window defogger must be turned ON. |
| • | The RDCM no longer detects a high current or short to voltage condition in the RH door lock control circuit. |
| • | The RDCM no longer detects a high current or short to voltage condition in the RH heated mirror control circuit. |
| • | The RDCM no longer detects a voltage drop of 5 volts or more at battery 2 when the RDCM applies the RH door lock or RH heated mirror. |
| • | 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 voltage in CKT 267, CKT 294 or CKT 295. |
| - | The RH door lock motor or RH heated mirror is shorted internally. |
| • | If the RDCM detects a malfunction in the RH door lock or RH heated mirror control system, the RDCM will disable the system that the malfunction was detected in. |
| • | Using a scan tool, select RDCM Data display and monitor battery 2 voltage while cycling the door locks. If battery 2 voltage drops more than 5 volts, then the RH door lock control circuit must be checked for a short to ground. Sense RDCM also monitors the voltage level in the RH heated mirror control circuit, this test can be applied to the heated mirror system. |
| • | 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 numbers below refer to the step numbers on the diagnostic table:
-
This test determines if the malfunction is located in the RH heated mirror circuit or the RH door lock circuit.
-
This test checks if the RDCM is sending the correct supply voltage to the RH heated mirror.
-
This test checks if the RDCM is sending the correct supply voltage to the RH door lock.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Were you sent here from the Power Door Diagnostic System Check? | -- | ||
Using the RH door lock switch, operate the RH lock. Does the RH door LOCK and UNLOCK properly? | -- | |||
Is the voltage within the specified range? | 10.0-14.0 V | |||
Is the voltage within the specified range when the RH door is LOCKED then UNLOCKED? | 10.0-14.0 V | |||
5 | Check for an open or short (to ground or voltage) in CKT 295 or CKT 294. Was a problem found and repaired? | -- | ||
6 | Check for an open or short (to ground or voltage) in CKT 450 or CKT 267. Was a problem found and repaired? | -- | ||
7 | Replace the RH mirror assembly. Refer to Outside Rearview Mirror Replacement . Is the replacement complete? | -- | -- | |
8 | Replace the RH door lock assembly. Refer to Door Lock Replacement . Is the replacement complete? | -- | -- | |
9 |
Is the replacement complete? | -- | -- | |
10 | Check the RH heated mirror circuit for an intermittent malfunction. Refer to Diagnostic Aids. Was a problem found and repaired? | -- | ||
11 | Check the RH door lock control circuit for an intermittent malfunction. Refer to Diagnostic Aids. Was a problem found and repaired? | -- | ||
12 |
Is the repair complete? | -- | -- |
