Test K: The Memory Seat Is Inoperative

PINPOINT TEST K: THE MEMORY SEAT IS INOPERATIVE

K1-K2:

K3-K6:

K6-K7:

K7-K8:

K9-K10:

K11-K12:

K13-K14:

K15-K16:

K17-K18:

K19-K21:

K21-K23:

K23-K25:

K25-K27:

K27-K29:

K29-K31:

K31 Continued:

Normal Operation
The driver seat control switch is powered by battery voltage on circuit 956 (OG/LG) and is supplied ground on circuit 1205 (BK). 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 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 circuit 566 (DG) and is supplied ground to DSM circuit 1203 (BK/LB).

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 SET switch or a remote entry transmitter. Refer to Principles of Operation or the owner's literature for additional information on programming the DSM 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 G. Test G: The Passenger Power Seat Does Not Move Horizontally/Recline (With Power Recliner)

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 mechanism.
- a faulty DSM.