Test L: The Memory Seat Does Not Operate Correctly - Does Not Operate Using the Memory Set Switch
PINPOINT TEST L: THE MEMORY SEAT DOES NOT OPERATE CORRECTLY - DOES NOT OPERATE USING THE MEMORY SET SWITCHL1-L3:
L4-L6:
L6-L7:
L8-L10:
L10-L12:
L12-L13:
L14-L16:
L16-L18:
L18-L19:
L20:
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 the owner literature or Principles of Operation. Principles of Operation
The pinpoint test diagnoses a memory seat that does not operate correctly using the memory SET switch. If the memory seat does not move in all directions using the seat control switch, GO to Pinpoint Test K. Test K: The Memory Seat Is Inoperative
Possible Causes
A memory seat that does not operate correctly can be caused by:
- wiring, terminals or connectors.
- a faulty memory SET switch.
- a faulty remote entry transmitter.
- a faulty memory power seat track.
- a faulty recliner mechanism.
- a faulty DSM.