B1770

CIRCUIT DESCRIPTION
The seat adjuster motors are controlled by the memory seat module through the power seat motor control circuits. The memory seat module also monitors current flow through the motor control circuits. In an active state the motor control circuits are switched to power and ground within the memory seat module. The direction of the adjuster motor rotation is determined by which of the control circuits are switched to battery positive voltage and which are grounded.

CONDITIONS FOR RUNNING THE DTC
^ The memory seat module detects a switch signal active or a memory function request and supplies voltage to the power seat motor control circuits
^ The system voltage must be between 9.0 and 16.0 volts.

CONDITIONS FOR SETTING THE DTC
The motor control circuit current monitored by the memory seat module is determined to be shorted to ground or battery positive voltage or open.

ACTION TAKEN WHEN THE DTC SETS
^ The memory seat module will disable the seat motor for which a current status DTC is set.
^ When the fault is no longer present a history status DTC will be stored, and motor operation will be restored.

CONDITIONS FOR CLEARING THE DTC
^ The DTC will be current for as long as the fault is present.
^ When the fault is no longer present the DTC will be a history status code.
^ The history DTC will be cleared after 100 error free ignition cycles, or by using the scan tool clearing DTCs feature.

TEST DESCRIPTION

Steps 1-9:

The number(s) below refer to the step number(s) on the diagnostic table.
2. Verify that the DTC is current or history by attempting to operate the seat motor for which the code is set.
3. Tests the motor control circuits for proper operation.