Circuit Description
The RH Door Control Module (RDCM) provides the RH mirror motor control output functions. This output control allows the RDCM to command the RH 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 mirror switch, the LDCM will send a message on the serial data line to the RDCM, the RDCM will command the RH window motor in the appropriate direction. The RDCM accomplishes this by applying a ground or voltage to RH vertical mirror motor control circuit or RH horizontal mirror motor control circuit, depending on the desired mirror position. The RDCM monitors the amount of current draw on both RH 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 RDCM commands the horizontal or vertical mirror motor ON. |
| • | The RDCM detects a short to ground or voltage condition in the RH horizontal or vertical mirror motor control circuit. |
| • | The RDCM detects battery 1 voltage under 7.9 volts with the RH horizontal or vertical mirror motor is applied. |
| • | Condition must be present for 2 seconds. |
Action Taken When the DTC Sets
| • | Stores a history DTC B2273 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 short to ground or voltage condition in the RH 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 RH vertical or horizontal mirror motor control circuit. |
| - | The RH vertical or horizontal mirror motor is shorted internally. |
| • | If the horizontal or vertical motor circuit is shorted (to ground or voltage), the RH mirror will operate only in certain directions depending on what circuit was affected. |
| • | Using a scan tool, select RDCM 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 number(s) below refer to the step number(s) on the diagnostic table.
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Tests for excessive current draw in the RH horizontal mirror motor control circuit by using a scan tool to monitor battery 1 voltage.
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Tests for excessive current draw in the RH vertical mirror motor control circuit by using a scan tool to monitor battery 1 voltage.
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Tests the RH horizontal mirror motor control circuit output voltage.
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Tests the RH vertical mirror motor control circuit output voltage.
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Tests for a short to ground or voltage in the RH horizontal mirror motor control circuits.
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Tests for a short to ground or voltage in the RH vertical mirror motor control circuits.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Power Door Systems Diagnostic System Check? | -- | Go to Step 2 | |
Operate the RH mirror LEFT and RIGHT while monitoring the Battery 1 voltage. Does the scan tool indicate that the Battery 1 voltage is less than the specified value when the RH mirror is operated LEFT and RIGHT? | 7.9 V | Go to Step 4 | Go to Step 3 | |
Does the scan tool indicate that the Battery 1 voltage is less than the specified value when the RH mirror is operated UP and DOWN? | 7.9 V | Go to Step 5 | Go to Diagnostic Aids | |
Does the voltage measure within the specified value? | 10.0-14.0 V | Go to Step 9 | Go to Step 6 | |
Does the voltage measure within the specified value? | 10.0-14.0 V | Go to Step 9 | Go to Step 7 | |
Test both the RH horizontal mirror motor control circuits for a short to ground or voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 8 | |
Test both the RH vertical mirror motor control circuits for a short to ground or voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 8 | |
8 | Replace the RH DCM. Refer to Door Control Module Replacement . Did you complete the replacement? | -- | Go to Step 10 | -- |
9 | Replace the RH mirror. Refer to Outside Rearview Mirror Replacement . Did you complete the replacement? | -- | Go to Step 10 | -- |
10 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
