• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
5-Volt Reference Terminal A3 X4 | B1825, B2355, B2365, B2375 | B1825, B2355, B2365, B2375 | B1825, B2355, B2365, B2375 | -- |
5-Volt Reference Terminal B3 X4 | B1850, B3606, B3607 | B1850, B3606, B3607 | B1850, B3606, B3607 | -- |
Recline Position Sensor Signal | B1825 | B1825 | B1825 | -- |
Horizontal Position Sensor Signal | B2375 | B2375 | B2375 | -- |
Rear Vertical Position Sensor Signal | B2365 | B2365 | B2365 | -- |
Front Vertical Position Sensor Signal | B2355 | B2355 | B2355 | -- |
Horizontal Lumbar Position Sensor Signal | B1850 | B1850 | B1850 | -- |
Low Reference Terminal B11 X4 | -- | B1825, B2355, B2365, B2375 | -- | -- |
Low Reference Terminal B10 X4 | -- | B1850, B3606, B3607 | -- | -- |
The position sensor that sets this diagnostic trouble code (DTC) is either attached to the seat directional motor drive cable or directly to the motor it monitors. It receives a 5-volt reference and ground from the memory seat module (MSM). The sensor sends a voltage signal that varies with the movement of the seat through the signal circuit to the MSM. Then based on this voltage signal, the MSM determines the position of the seat.
Battery voltage to the seat module must be within 7-16 volts.
The position sensor signal circuit voltage level to the MSM is not within the 0.39-4.58 volt range.
The memory recall functions for the seat motor with a current status DTC will be disabled.
• | The DTC will be stored as a history code when the fault is no longer present. |
• | The history DTC will clear after 100 consecutive fault-free ignition cycles have occurred. |
• | The scan tool may reference the Memory Seat Module as the Driver Seat Module. |
• | All driver seat position sensors use common 5-volt reference and low reference circuits. |
• | The driver seat lumbar position sensor and the adjustable pedal position sensors use common 5-volt reference and low reference circuits. |
• | If the 5-volt reference circuit is shorted to ground or voltage multiple position sensor codes will set. |
• | If the sensor low reference circuit is open multiple codes will set. |
Memory Seats Description and Operation
Control Module References for scan tool information
Ignition ON, observe the scan tool Driver Seat Module driver seat and lumbar position sensor parameters. The readings should be between 0.39 volts and 4.58 volts and change while adjusting seat and lumbar positions.
• | Seat recline sensor terminal D |
• | Front vertical sensor terminal C |
• | Rear vertical sensor terminal A |
• | Seat horizontal sensor terminal A |
⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the MSM. |
• | Seat recline sensor terminal A |
• | Front vertical sensor terminal A |
• | Rear vertical sensor terminal C |
• | Seat horizontal sensor terminal C |
⇒ | If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the MSM. |
⇒ | If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the MSM. |
• | Seat Horizontal Position |
• | Front Vertical Position |
• | Rear Vertical Position |
• | Recline Position |
⇒ | If greater than the specified range, test the appropriate signal circuit listed below for a short to voltage. If the circuit tests normal, replace the MSM. |
• | Seat recline sensor terminal C |
• | Front vertical sensor terminal B |
• | Rear vertical sensor terminal B |
• | Seat horizontal sensor terminal B |
• | Seat recline sensor terminal C and terminal A |
• | Front vertical sensor terminal B terminal A |
• | Rear vertical sensor terminal B terminal C |
• | Seat horizontal sensor terminal B terminal C |
⇒ | If less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the MSM. |
⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the MSM. |
⇒ | If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the MSM. |
⇒ | If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the MSM. |
⇒ | If greater than the specified value, test the signal circuit terminal 2 for a short to voltage. If the circuit tests normal, replace the MSM. |
⇒ | If less than the specified range, test the signal circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the MSM. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for MSM replacement, programming, and setup. |