Test K: The Memory Seat Does Not Operate Correctly - Does Not Operate Using the Memory Set Switch
PINPOINT TEST K: THE MEMORY SEAT DOES NOT OPERATE CORRECTLY - DOES NOT OPERATE USING THE MEMORY SET SWITCHNormal Operation
The driver seat control switch is powered by battery voltage on circuit SBB15 (VT/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 the 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 SET switch or a remote entry transmitter. The memory SET switch is hard-wired to the driver door module (DDM) and communicates memory SET commands to the DSM via medium-speed controller area network (MS-CAN). For information on programming memory positions or recalling a stored memory position, refer to Memory Position Programming. Programming and Relearning
The following 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 J. Test J: The Memory Seat Is Inoperative/Does Not Operate Correctly - Does Not Operate Horizontally/Vertically/Recline
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Memory SET switch
- Remote entry transmitter
- Seat track
- Seat recliner motor
- DSM
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