Circuit Description
The LH Door Control Module (LDCM) provides the LH mirror motor control output functions. This output control allows the LDCM to command the LH power mirror in the horizontal or vertical position. The LH door switch circuit provides an input to the LDCM when the mirror switch is pressed UP, DOWN, LEFT or RIGHT. When the LDCM detects an active mirror command from the LH mirror switch, the LDCM will command the LH mirror motor in the appropriate direction. The LDCM accomplishes this by applying a ground or voltage to CKT 89 and CKT 88 (vertical motor), or CKT 82 and CKT 81 (horizontal motor), depending on the desired mirror position. The LDCM monitors the amount of current draw on both LH the horizontal and vertical mirror motor control circuits. If the current draw is not within the acceptable range, a malfunction is present and a DTC will set.
Conditions for Setting the DTC
| • | The LDCM commands the horizontal or vertical mirror motor ON. |
| • | The LDCM detects a high current or short to voltage condition in the LH horizontal or vertical mirror motor control circuit. |
| • | The LDCM detects battery 1 voltage under 7.9 volts with the LH horizontal or vertical mirror motor is applied. |
| • | Condition must be present for 2 seconds. |
Action Taken When the DTC Sets
| • | Stores a history DTC B2272 in the LDCM 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 LDCM no longer detects a high current or short to voltage condition in the LH horizontal or vertical mirror motor control circuit for longer than 2 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 voltage in the LH vertical or horizontal mirror motor control circuit. |
| - | The LH vertical or horizontal mirror motor is shorted internally. |
| • | If the horizontal or vertical motor circuit is shorted (to ground or voltage), the LH mirror will operate only in certain directions depending on what circuit was affected. |
| • | Using a scan tool, select LDCM inputs and monitor the mirror motor load while operating the mirror motor in all directions. If the scan tool displays the mirror motor load as 0, then check the mirror motor circuit for opens. |
| • | 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 LH mirror horizontal motor circuit or the LH mirror vertical motor circuit.
-
This test checks if the LDCM is sending the correct supply voltage to the LH vertical mirror motor.
-
This test checks if the LDCM is sending the correct supply voltage to the LH horizontal mirror motor.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Were you sent here from the Power Door Diagnostic System Check? | -- | ||
Using the LH door switch, select LH mirror and operate the LH mirror LEFT and RIGHT. Does the LH outside rearview mirror move LEFT and RIGHT? | -- | |||
Is the voltage within the specified range in the UP and DOWN positions? | 10.0-14.0 V | |||
Is the voltage within the specified range in the LEFT and RIGHT positions? | 10.0-14.0 V | |||
5 | Check for an open or short (to ground or voltage) in CKT 88 or CKT 89. Was a problem found and repaired? | -- | ||
6 | Check for an open or short (to ground or voltage) in CKT 81 or CKT 82. Was a problem found and repaired? | -- | ||
7 | Replace the LH mirror assembly. Refer to Outside Rearview Mirror Replacement . Is the replacement complete? | -- | -- | |
8 |
Is the replacement complete? | -- | -- | |
9 | Check both the mirror horizontal and vertical position sensor circuits for an intermittent malfunction. Refer to Diagnostic Aids. Was a problem found and repaired? | -- | ||
10 |
Is the repair complete? | -- | -- |
