Circuit Description
The driver seat adjuster motors are equipped with potentiometer type position sensors used by the driver seat module (DSM) to determine the seat position. The position sensors are supplied with 5-volt reference and ground circuits from the driver seat module. The position sensor signal circuits are referenced from ground within the DSM. The signal circuit voltage levels monitored by the DSM range from 0.39-4.58 volts and are determined by the wiper locations on the resistors within the motor position sensors. The position sensor circuit voltage levels are used by the DSM to determine the seat position when storing or recalling memory position settings.
DTC Descriptors
This diagnostic procedure supports the following DTCs:
| • | DTC B1825 Driver Seat Recline Position Sensor Circuit |
| • | DTC B1850 Driver Seat Lumbar Horizontal Position Sensor Circuit |
| • | DTC B2355 Driver Seat Front Vertical Position Sensor Circuit |
| • | DTC B2365 Driver Seat Rear Vertical Position Sensor Circuit |
| • | DTC B2375 Driver Seat Horizontal Position Sensor Circuit |
Conditions for Running the DTC
Battery voltage to the seat module must be within 7-16 volts.
Conditions for Setting the DTC
The position sensor signal circuit voltage level to the DSM is not within the 0.39-4.58 volt range.
Action Taken When the DTC Sets
The memory recall functions for the seat motor with a current status DTC will be disabled.
Conditions for Clearing the DTC
| • | The DTC will be stored as a history code when the fault is no longer present. |
| • | A history DTC will be cleared after completing 100 consecutive ignition cycles, or by using the scan tool clearing DTCs feature. |
Diagnostic Aids
If the DTC is only found in history, the fault may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections .
Step | Action | Values | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
Schematic Reference: Driver Seat Schematics Connector End View Reference: Power Seat Connector End Views | ||||||||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |||||||
2 |
Is the Position Sensor parameter is within the specified range? | 0.39-4.58 V | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 | ||||||
3 |
Is the Position Sensor parameter less than the specified value? | 0.39 V | Go to Step 4 | Go to Step 8 | ||||||
4 |
Is the Position Sensor parameter greater than the specified value? | 4.58 V | Go to Step 5 | Go to Step 7 | ||||||
5 |
Is the voltage measure greater than the specified value? | 5 V | Go to Step 6 | Go to Step 10 | ||||||
6 | Test the 5-volt reference circuit for a short to voltage. Refer to Circuit Testing and to Wiring Repairs. Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 12 | ||||||
7 | Test the 5-volt reference circuit for one of the following conditions:
Refer to Circuit Testing and to Wiring Repairs. Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 9 | ||||||
8 | Test the signal circuit of the position sensor for a short to voltage. Refer to Circuit Testing and to Wiring Repairs. Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 12 | ||||||
9 | Test the signal circuit of the position sensor for one of the following conditions:
Refer to Circuit Testing and to Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 12 | ||||||
10 | Test the low reference circuit of the position sensor for an open or high resistance. Refer to Circuit Testing and to Wiring Repairs. Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 11 | ||||||
11 | Inspect for poor connections at the position sensor. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs. Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 13 | ||||||
12 | Inspect for poor connections at the seat control module. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs. Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 14 | ||||||
13 | Replace the seat sensor. Refer to Power Seat Adjuster Mechanism Replacement . Did you complete the replacement? | -- | Go to Step 15 | -- | ||||||
14 | Replace the seat module. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 15 | -- | ||||||
15 |
Does the DTC reset? | -- | Go to Step 2 | System OK | ||||||
