• | 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 - Seat Position Sensors | B1825, B2355, B2365, B2375 | B1825, B2355, B2365, B2375 | B1825, B2355, B2365, B2375 | B1826, B2356, B2366, B2376 |
Front Vertical Position Sensor Signal | B2355 | B2355 | B2355 | -- |
Horizontal Position Sensor Signal | B2375 | B2375 | B2375 | -- |
Recline Position Sensor Signal | B1825 | B1825 | B1825 | -- |
Rear Vertical Position Sensor Signal | B2365 | B2365 | B2365 | -- |
Memory Seat/Mirror Sensor Low Reference | -- | B1825, B2355, B2365, B2375 | -- | B1826, B2356, B2366, B2376 |
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 low reference 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.
• | DTC B1327 must not be present. |
• | Battery voltage must be between 9-16 volts. |
This DTC will set, if the MSM is controlling a motor in one direction and it's position sensor is tracking the motor in the opposite direction. The sensor is either mounted or wired incorrectly, or the polarity of the motor control circuits are reversed.
The motor associated with the fault will be disabled for memory functions.
• | The condition responsible for setting the DTC no longer exists. |
• | A history DTC will clear once 50 consecutive malfunction-free ignition cycles have occurred. |
The memory seat module is also referred to as the Driver Position Module in certain scan tool menus.
Memory Seats Description and Operation
Control Module References for scan tool information
• | Recline forward terminal A |
• | Recline rearward terminal B |
⇒ | If the control circuits are not in the correct cavities, make the appropriate changes. |
• | 5-volt reference terminal A |
• | Low reference terminal D |
⇒ | If the 5-volt reference and low reference circuits are not in the correct cavities, make the appropriate changes. |
• | Front vertical motor up control terminal C |
• | Front vertical motor down control terminal D |
• | Rear vertical motor up control terminal E |
• | Rear vertical motor down control terminal F |
• | Seat horizontal motor forward control terminal A |
• | Seat horizontal motor rearward control terminal B |
⇒ | If the control circuits are not in the correct cavities, make the appropriate changes. |
• | Front vertical sensor 5-volt reference terminal C |
• | Front vertical sensor low reference terminal A |
• | Rear vertical sensor 5-volt reference terminal C |
• | Rear vertical sensor low reference terminal A |
• | Seat horizontal sensor 5-volt reference terminal A |
• | Seat horizontal sensor low reference terminal C |
⇒ | If the 5-volt reference and low reference circuits are not in the correct cavities, make the appropriate changes. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for MSM replacement, setup, and programming