Front Riser Sensor Out Of Range Low

Monitored & Set Condition

1. When Monitored: Ignition on.
2. Set Condition: This code is immediately set when the seat motor potentiometer feeds a value lower than the Memory Seat Module has stored in EEPROM.

Possible Causes:

• Front Riser Position Signal Circuit Open
• Front Riser Position Signal Circuit Short To Ground
• Seat Sensor 5-Volt Supply Open
• Seat Sensor 5-Volt Supply Short To Ground
• Front Riser Sensor Low
• Memory Heated Seat Mirror Module

Testing

1. Turn ignition off. Ensure Memory Heated Seat/Mirror Module (MHSMM) is properly connected. Disconnect driver power seat front riser motor sensor connector. Turn ignition on. Measure voltage on driver power seat front riser motor sensor connector terminal No. 1, seat sensor 5-volt supply circuit (Brown/White wire). See Figure . If voltage is more than 4.5 volts, leave driver power seat front riser motor sensor connector disconnected and go to step  4 . If voltage is 4.5 volts or less, leave driver power seat front riser motor sensor connector disconnected and go to next step.
2. Turn ignition off. Disconnect MHSMM connector C2. Measure resistance of seat sensor 5-volt supply circuit (Brown/White wire) between driver power seat front riser motor sensor connector terminal No. 1 and MHSMM connector C2 terminal No. 6. See Figure and Figure . If resistance is less than 5 ohms, leave MHSMM connector C2 disconnected and go to next step. If resistance is 5 ohms or more, repair open in Brown/White wire.
3. Measure resistance between ground and MHSMM connector C2 terminal No. 6, seat sensor 5-volt supply circuit (Brown/White wire). If resistance is less than 100 ohms, repair short to ground in Brown/White wire. If resistance is 100 ohms or more, replace MHSMM. See MEMORY HEATED SEAT/MIRROR MODULE  under REMOVAL & INSTALLATION.
4. Turn ignition off. Connect scan tool to Data Link Connector (DLC). Turn ignition on. Using scan tool, monitor FRONT RISER POSITION SENSOR voltage. Connect a fused jumper wire between driver power seat front riser motor sensor connector terminal "C", seat sensor 5-volt supply circuit (Brown/White wire) and terminal "B", front riser position signal circuit (Brown wire). If voltage is more than 4.5 volts, replace seat track assembly. If voltage is 4.5 volts or less, leave driver power seat front riser motor sensor connector disconnected and go to next step.
5. Ensure ignition is off. Disconnect MHSMM connector C1. Measure resistance between ground and MHSMM connector C1 terminal No. 15, front riser position signal circuit (Brown wire). See Figure . If resistance is less than 5 ohms, leave connectors disconnected and go to next step. If resistance is 5 ohms or more, repair open in Brown wire.
6. Measure resistance between ground and MHSMM connector C1 terminal No. 15, front riser position signal circuit (Brown wire). If resistance is less than 100 ohms, repair short to ground in Brown wire. If resistance is 100 ohms or more, replace MHSMM. See MEMORY HEATED SEAT/MIRROR MODULE  under REMOVAL & INSTALLATION.