For 1990-2009 cars

### Circuit Description

The potentiometer type position sensor that sets this DTC is an internal part of the seat directional motor. It receives a 5-volt reference and low reference from the memory seat module (MSM). The sensor sends a voltage signal that is pulled up to voltage by the MSM. This voltage signal varies with the movement of the seat. Then based on this voltage signal, the MSM determines the position of the seat.

### DTC Descriptors

This diagnostic procedure supports the following DTCs:

• | DTC B1825 Seat Recline Position Sensor Circuit

• | DTC B1850 Seat Lumbar Horizontal Position Sensor Circuit

• | DTC B1860 Seat Lumbar Vertical Position Sensor Circuit

• | DTC B2355 Seat Front Vertical Position Sensor Circuit

• | DTC B2365 Seat Rear Vertical Position Sensor Circuit

• | DTC B2375 Seat Assembly Horizontal Position Sensor Circuit

This Vehicle has DTCs which include DTC Symptoms. For more information on DTC Symptoms, refer to DTC Symptom Description .

DTC Symptom | DTC Symptom Descriptor
--- | ---
08 | Out of Range--Exceeds Lower or Upper Limits

### Conditions for Running the DTC

The MSM must be powered and cannot have B1325 Battery Voltage Low as an active DTC for this DTC to set.

### Conditions for Setting the DTC

If the MSM sees the voltage signal from this sensor as either lower than 0.25 volts or higher than 4.75 volts, the sensor will be considered out of range and the MSM will set this DTC.

### Action Taken When the DTC Sets

The MSM disables all memory recall commands of the motor monitored by the sensor. The motor will respond to manual positioning commands.

### Conditions for Clearing the DTC

The MSM will clear the DTC when it detects that the voltage from the sensor signal circuit is between 0.25 volts and 4.75 volts.

### Diagnostic Aids

• | The MSM is referenced in the Tech 2 as the driver position module (DPM) for this vehicle.

• | All position sensors use common low reference and 5-volt reference circuits.

• | If the 5-volt reference circuit is shorted to voltage multiple codes will set.

• | If the 5-volt reference circuit is shorted to ground multiple codes will set.

• | If the sensor low reference circuit is open multiple codes will set.

### Test Description

The numbers below refer to the step numbers on the diagnostic table.

1. This step tests for the proper operation of the circuit in the high voltage range.

2. This step tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to voltage.

Step | Action | Value(s) | 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 | Go to Diagnostic System Check - Vehicle
2 |

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. With a scan tool, observe the appropriate Sensor parameter in the Driver Position Module data list.

Does the scan tool indicate that the Sensor parameter is within the specified range?

0.25-4.75V

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

3 |

1. Turn OFF the ignition.
2. Disconnect the appropriate sensor connector.
3. Turn ON the ignition, with the engine OFF.
4. With a scan tool, observe the appropriate Sensor parameter.

Does the scan tool indicate that the Sensor parameter is greater than the specified value?

4.75V

Go to Step 4

Go to Step 5

4 |

1. Turn OFF the ignition.
2. Connect a 3-amp fused jumper wire between the signal circuit of the sensor connector and the low reference circuit of the sensor connector.
3. Turn ON the ignition, with the engine OFF.
4. With a scan tool, observe the appropriate Sensor parameter.

Does the scan tool indicate that the Sensor parameter is less than the specified value?

0.25V

Go to Step 6

Go to Step 8

5 | Test the 5-volt reference circuit of the sensor for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 7
6 | Test the 5-volt reference circuit of the sensor for the following conditions:

• | A short to voltage

• | A high resistance

• | An open

Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

--

Go to Step 15

Go to Step 11

7 | Test the signal circuit of the sensor for a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 12
8 | Test the signal circuit of the sensor for the following conditions:

• | A short to voltage

• | A high resistance

• | An open

Refer to Circuit Testing and Wiring Repairs .

Did you find and correct the condition?

--

Go to Step 15

Go to Step 9

9 | Test the low reference circuit of the sensor for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 10
10 | Test the 5-volt reference circuit of the sensor for a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 12
11 | Inspect for poor connections at the harness connector of the sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 13
12 | Inspect for poor connections at the harness connector of the memory seat module (MSM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 15 | Go to Step 14
13 | Replace the appropriate seat or lumbar position sensor. Did you complete the replacement? | -- | Go to Step 15 | --
14 | Replace the MSM. Refer to Control Module References for replacement, setup and programming. Did you complete the replacement? | -- | Go to Step 15 | --
15 |

1. Use the scan tool in order to clear the DTCs.
2. Operate the vehicle within the Conditions for Running the DTC, as specified in the supporting text.

Does the DTC reset?

--

Go to Step 2

System OK