B2243

CIRCUIT DESCRIPTION
The driver door switch signal circuits provide input to the driver door module (DDM) when the memory 1 or memory 2 select switch is activated. These inputs allow the DDM to detect a memory function recall request. The DDM provides power and ground to the memory switches. When a memory select switch is activated, ground is supplied through the memory select switch to the signal circuit, which is pulled low. When the DDM detects low voltage on the signal circuit, it will activate the memory functions and also send a message on the serial data line to other modules responsible for memory recall functions. The DDM monitors the signal circuits to determine how long the 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 memory 1 or memory 2 select switch signal circuit.
^ Condition must be present for greater than 20 seconds.

ACTION TAKEN WHEN THE DTC SETS
^ Stores a history DTC B2242 or B2244 in the DDM 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 no longer detects a short to ground on a memory 1 or memory 2 select 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 memory 1 or the memory 2 select switch signal circuit.
- The memory 1 or the memory 2 select switch is shorted to ground internally or is sticking.
- The memory 1 or the memory 2 select 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 memory 1 or the memory 2 select 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 memory 1 or memory 2 select 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 memory 1 or memory 2 select switch. If the memory 1 or memory 2 select switch is stuck or shorted, the state will change from Active to Inactive when the memory 1 or memory 2 select switch is disconnected.
5. Tests for a short to ground in the memory 1 or the memory 2 select switch signal circuit.