B2229

CIRCUIT DESCRIPTION
The driver door switch signal circuits provide inputs to the driver door module (DDM) when the mirror switch is activated. These inputs allow the DDM to detect a mirror direction request. The DDM provides both power and ground to the mirror switches. When a mirror switch is activated to the right, left, up or down position, ground is supplied through the mirror switch to the signal circuit, which is pulled low. When the DDM detects low voltage on the signal circuit, it will command the mirror to rotate in the direction selected. The DDM controls passenger mirror functions by sending mirror control messages to the passenger door module (PDM) on the serial data line and the PDM then commands the passenger mirror. The DDM monitors both the driver and passenger mirror switch signal circuits to determine how long a ground has been applied. If the DDM detects that a ground is applied for greater than 20 seconds, a DTC is set.

CONDITIONS FOR SETTING THE DTC
^ The DDM detects a short to ground on a mirror switch signal circuit.
^ Condition must be present for greater than 20 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ Stores a history DTC B2226, B2228, B2232 or B2234 in DDM 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 DDM no longer detects a short to ground on a mirror directional switch signal circuit for greater than 20 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 in the mirror right, left, up or down switch signal circuit.
- The mirror switch is shorted to ground internally or is sticking.
- The mirror switch was pressed for longer than 20 seconds.
^ 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 1-10:

The numbers below refer to the step numbers on the diagnostic table.
2. Tests for the normal state of the mirror right, left, up or down switch using a scan tool. The scan tool will display the normal state as Inactive, and Active when the switch is activated.
3. Tests if the DDM is able to detect a change in mirror switch state. The scan tool will display the normal state as Inactive, and Active when the switch is activated.
4. Tests for a stuck or shorted mirror switch. If the mirror switch is stuck or shorted, the state will change from Active to Inactive when the mirror switch is disconnected.
5. Tests for a short to ground in the appropriate mirror switch signal circuit.