B2273

CIRCUIT DESCRIPTION
The driver door module (DDM) and the passenger door module (PDM) each provide motor control output functions for their respective mirrors. These output controls allow the DDM and the PDM to command their respective power mirrors in horizontal and vertical positions. The mirror switch circuits in the driver door switch provide inputs to the DDM when the mirror switch is pressed UP, DOWN, LEFT or RIGHT. When the DDM detects an active mirror command from the mirror switch, the DDM will command the respective mirror motor in the appropriate direction. The DDM controls passenger mirror functions by sending mirror control messages to the PDM on the serial data line, and the PDM then commands the passenger mirror. Each door module commands their respective mirror motors by applying a ground or voltage to the control circuit, depending on the desired mirror position. If the DDM or PDM detects a short to ground or voltage condition in a mirror motor control circuit for greater than 2 seconds, a DTC is set.

CONDITIONS FOR SETTING THE DTC
^ The DDM or PDM detects a short to ground or voltage condition in a mirror motor control circuit.
^ Condition must be present for 2 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ Stores a history DTC B2272 or B2273 in DDM or PDM memory.
^ These DTCs 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 DDM or PDM no longer detects a short to ground or voltage condition in a mirror motor control circuit for longer than 2 seconds, and:
^ The DTC is cleared using the IPC clearing feature, or
^ The DTC is cleared using a scan tool.

DIAGNOSTIC AIDS
^ The following conditions may cause an intermittent malfunction:
- There is an intermittent short to ground or voltage in a mirror motor control circuit.
- A mirror motor is shorted internally.
^ If the DTC does not reset after the code is cleared, then the problem may be intermittent. Refer to Testing for Intermittent and Poor Connections in Diagnostic Aids.

TEST DESCRIPTION

Steps 1-11:

The numbers below refer to the step numbers on the diagnostic table.
2. Tests for proper operation of the outside rearview mirror.
3. Tests for a shorted outside rearview mirror.
5. Tests for a short to ground or voltage in the vertical mirror motor control circuits.
6. Tests for a short to ground or voltage in the horizontal mirror motor control circuits.