Rear Riser Sensor Out Of Range Low

When Monitored: Ignition on.

Set Condition: This condition is immediately set when the seat motor potentiometer feeds a value lower than the Memory Heated Seat/Mirror Module has stored in EEPROM.

Possible Causes are:

• SEAT SENSOR 5 V SUPPLY SHORT TO GROUND
• REAR RISER SENSOR (LOW)
• SEAT SENSOR 5-VOLT SUPPLY OPEN
• REAR RISER POS SIGNAL CIRCUIT SHORT TO GROUND
• REAR RISER POSITION SIGNAL CIRCUIT OPEN
• MEMORY SEAT MODULE INTERNAL 5-VOLT LOW
• MEMORY SEAT MODULE INTERNAL LOW

1. Ensure the Memory Seat Module is fully connected before proceeding. Disconnect the Driver Power Seat Rear Riser Sensor connector. Turn ignition on. Measure the voltage of the seat sensor 5-volt supply circuit. Is the voltage more than 4.5 volts? If yes, go to next step. If no, go to step  6 .
2. Turn ignition off. Disconnect the Driver Power Seat Rear Riser Sensor connector. Connect a jumper wire between seat sensor 5-volt supply and Rear Riser Position Signal circuits. Ensure the Memory Seat Module is fully connected before proceeding. Using the DRBIII(R), select: Body, Memory Seat Sensors. Turn ignition on. Read the Rear Riser Position Sensor voltage. Is the voltage more than 4.5 volts? If yes, replace the Seat Track Assy. Perform MEMORY SYSTEM VERIFICATION TEST  under VERIFICATION TESTS. If no, go to next step.
3. Turn ignition off. Disconnect the Seat Module C1 connector. Disconnect the Driver Power Seat Rear Riser Sensor connector. Measure the resistance of the Rear Riser Position Signal circuit to ground. Is the resistance less than 1000 ohms? If yes, repair the Rear Riser Position Signal circuit for a short to ground. Perform MEMORY SYSTEM VERIFICATION TEST  under VERIFICATION TESTS. If no, go to next step.
4. Turn ignition off. Disconnect the Seat Module C1 connector. Disconnect the Driver Power Seat Rear Riser Sensor connector. Measure the resistance of the Rear Riser Position Signal circuit between the Sensor connector and the Module connector. Is the resistance less than 5 ohms? If yes, go to next step. If no, repair the open Rear Riser Position Signal circuit. 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. Turn ignition off. Disconnect the Seat Module C1 connector. Measure the resistance of the seat sensor 5-volt supply circuit to ground. Is the resistance less than 1000 ohms? If yes, repair the seat sensor 5-volt supply for a short to ground. Perform MEMORY SYSTEM VERIFICATION TEST  under VERIFICATION TESTS. If no, go to next step.
7. Disconnect the Driver Power Seat Rear Riser Sensor connector. Disconnect the Seat Module C1 connector. Turn ignition off. Measure the resistance of the seat sensor 5-volt supply circuit between the Sensor connector and the Module connector. Is the resistance less than 5 ohms? If yes, go to next step. If no, repair the open seat sensor 5-volt supply circuit. Perform MEMORY SYSTEM VERIFICATION TEST  under VERIFICATION TESTS.
8. If there are no possible causes remaining, replace the Memory Seat Module. Perform MEMORY SYSTEM VERIFICATION TEST  under VERIFICATION TESTS.