Driver Seat Front Riser Movement Inoperative

Possible Causes are:

• SEAT FRONT UP DRIVER WIRE OPEN
• SEAT FRONT DOWN DRIVER WIRE OPEN
• SEAT FRONT DOWN SWITCH SENSE WIRE OPEN
• DRIVER FRONT RISER MOTOR INOPERATIVE
• DRIVER POWER SEAT SWITCH
• MSM FRONT RISER MOTOR OUTPUT
• MSM FRONT RISER SWITCH INPUT OPEN
• SEAT FRONT UP SWITCH SENSE WIRE OPEN

1. Using the DRBIII(R), select: Body, Memory Seat Module Actuators. Actuate the Front Riser Motor up and then down. Did the Front Riser Motor operate in both directions? If yes, go to next step. If no, go to step  6 .
2. Turn ignition off. Remove the seat and gain access to the connectors. Disconnect the Seat Module C1 connector. Disconnect the Driver Power Seat Switch connector. Measure the resistance of the Seat Front Down Switch Sense circuit between the MSM connector and the Seat Switch connector. Is the resistance less than 5 ohms? If yes, go to next step. If no, repair the open Seat Front Down Switch Sense wire. Perform MEMORY SYSTEM VERIFICATION TEST  under VERIFICATION TESTS.
3. Turn ignition off. Remove the seat and gain access to the connectors. Disconnect the Seat Module C1 connector. Disconnect the Driver Power Seat Switch connector. Measure the resistance of the Seat Front Up Switch Sense circuit between the MSM connector and the Seat Switch connector. Is the resistance less than 5 ohms? If yes, go to next step. If no, repair the open Seat Front Up Switch Sense wire. Perform MEMORY SYSTEM VERIFICATION TEST  under VERIFICATION TESTS.
4. Ensure the Driver Power Seat Switch Is fully connected. Disconnect the Seat Module C1 connector. Connect a test light between the Seat Front Up Switch Sense circuit and the Seat Front Down Switch Sense circuit in the Seat Module connector. Move the Front Riser Switch to the UP and then the DOWN positions and observe the test light. Did the test light illuminate when the switch was moved in both directions? If yes, go to next step. If no, replace the driver power seat switch. Perform MEMORY SYSTEM VERIFICATION TEST  under VERIFICATION TESTS.
5. If there are no possible causes remaining, replace the Memory Seat Module. Perform MEMORY SYSTEM VERIFICATION TEST  under VERIFICATION TESTS.
6. Remove the seat and gain access to the connectors. Disconnect the Seat Module C2 connector. Disconnect the driver power seat front riser motor connector. Measure the resistance of the Seat Front Up Driver circuit between the Seat Module connector and the seat front riser motor connector. Is the resistance less than 5 ohms? If yes, go to next step. If no, repair the Seat Front Up Driver wire for an open. Perform MEMORY SYSTEM VERIFICATION TEST  under VERIFICATION TESTS.
7. Turn ignition off. Remove the seat and gain access to the connectors. Disconnect the Seat Module C2 connector. Disconnect the driver power seat front riser motor connector. Measure the resistance of the Seat Front Down Driver circuit between the MSM connector and the seat front riser motor connector. Is the resistance less than 5 ohms? If yes, go to next step. If no, repair the Seat Front Down Driver wire for an open. Perform MEMORY SYSTEM VERIFICATION TEST  under VERIFICATION TESTS.
8. Remove the seat and gain access to the connectors. Disconnect the Seat Module C2 connector. Ensure the Front Riser Motor connector is connected at this time. Connect a jumper wire from the Seat Front Up Driver circuit to the Ground circuit in the Seat Module C2 connector. Connect a jumper wire to the Seat Front Down Driver circuit and momentarily touch it to the Fused B (+) circuit. Reverse the Ground and Fused B (+) jumper wires momentarily to run the motor in the opposite direction. Did the Front Riser Motor run in both directions? If yes, go to next step. If no, replace the seat track assembly. Perform MEMORY SYSTEM VERIFICATION TEST  under VERIFICATION TESTS.
9. If there are no possible causes remaining, replace the Memory Seat Module. Perform MEMORY SYSTEM VERIFICATION TEST  under VERIFICATION TESTS.