Test L: The Memory Seat Is Inoperative

PINPOINT TEST L: THE MEMORY SEAT IS INOPERATIVE

L1-L2:

L3-L6:

L6-L7:

L7-L8:

L9-L11:

L11-L12:

L13-L14:

L15-L16:

L17-L18:

L19-L21:

L21-L23:

L23-L25:

L25-L27:

L27-L29:

L29-L30:

L31:

Normal Operation
The driver seat control switch is powered by battery voltage on circuit SBB15 (WH/RD) and is supplied ground on circuit GD126 (BK/WH). When pressed, the seat control switch supplies the voltage and ground to the applicable driver seat module (DSM) inputs. The DSM then supplies voltage and ground to the appropriate power seat track motor or power recline motor based on the inputs received from the seat control switch. When pressed in the opposite direction, the seat control switch reverses the polarity to the DSM inputs, and the DSM likewise reverses polarity of the appropriate power seat track motor or power recliner motor circuits causing the seat or backrest to move in the opposite direction. There are 3 power seat track motors that combine to move the seat horizontally (FORWARD/REARWARD) and vertically (front UP/DOWN and rear UP/DOWN). The seat backrest power recliner mechanism uses a single motor to move the seat backrest FORWARD and REARWARD.

Battery voltage is also supplied to DSM on circuit SBB15 (WH/RD) and SBB32 (VT/RD). Ground is supplied to the DSM on circuit GD126 (BK/WH).

Each motor, in the memory power seat track and power recliner mechanism contains a Hall-effect position sensor. The DSM supplies a signal feed circuit to each position sensor and a shared reference signal return circuit. Each position sensor sends a signal voltage back to the DSM used to monitor the position of the power seat and seat backrest. The DSM uses this information to return the seat to a stored pre-programmed position when pressing the memory seat position switch or a remote entry transmitter. The memory seat position switch is hard-wired to the driver door module (DDM) and communicates memory SET commands to the DSM via MS-CAN. Refer to Principles of Operation or the owner's literature for additional information on programming the DDM for storing memory seat positions. Principles of Operation

The pinpoint test diagnoses a memory seat that does not operate in one or more directions when using the seat control switch. If the memory seat moves in all directions using the seat control switch, GO to Pinpoint Test M. Test M: The Memory Seat Does Not Operate Correctly - Does Not Operate Using the Memory Seat Position Switch

Possible Causes
An inoperative memory seat can be caused by:
- a fuse.
- wiring, terminals or connectors.
- a faulty seat control switch.
- a faulty power seat track.
- a faulty power recliner motor.
- a faulty DSM.