GM Service Manual Online
For 1990-2009 cars only

Diagnostic Instructions

    • 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.

DTC Descriptor

DTC B3250: Power Sliding Door Position Signal Circuit

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Power Sliding Door Module B+

B1292, B1395

B1292, B1395

--

--

Left/Right Sliding Door Open/Close Switch Signal

2

2

2

--

Left/Right Door Enable Switch Signal

1, 2

--

2

--

Left/Right Sliding Door Latch Motor Control

1

1

1

--

Park/Neutral Position Park Signal

--

1

--

--

Left/Right Sliding Door Clutch Control

B1292, B1293, B1294

B1292, B1293, B1294

B1293

--

Left/Right Sliding Door Motor Open Control

B1292

B1292

B1292

--

Left/Right Sliding Door Motor Close Control

B1292

B1292

B1292

--

Left/Right Sliding Door Detent Switch Signal

1

B1294

1

--

Left/Right Sliding Door Sensor Voltage Reference

1

B1395

1

--

Left/Right Sliding Door Sensor Low Reference

1

B1395

1

--

Left/Right Sliding Door Sensor 1 Signal

1

B1395

1

--

Left/Right Sliding Door Sensor 2 Signal

1

B1395

1

--

Left/Right Sliding Door Clutch Ground

--

B1292, B1293, B1294

1

--

PSDM Ground

--

1

1

--

1. Power Sliding Door Malfunction

2. Power Sliding Door Open/Close Switch Inoperative

Circuit/System Description

The power sliding door control module (PSDM) uses an optical sensor to monitor the power sliding door (PSD) position at all times. The optical sensor requires a 5-volt reference circuit and a reference return circuit from the PSDM. There are also 2 signal circuits from the PSDM to the optical sensor. The optical sensor sends pulses through both signal circuits to the PSDM whenever the PSD is in motion. The optical sensor pulses allow the PSDM to calculate the position of the PSD at all times. The optical sensor signals vary from 0.01-4.5 volts as the PSD is moving.

Conditions for Running the DTC

When the PSDM is powered up and has been commanded to operate the power sliding door.

Conditions for Setting the DTC

The PSDM does not detect the optical sensor pulses while the power sliding door is opening or closing.

Action Taken When the DTC Sets

The power sliding door will unlatch and will open approximately 16mm (6 inches) and stop.

Conditions for Clearing the DTC

    • The DTC will be current for as long as the fault is present.
    • When the fault is no longer present, the DTC will be a history DTC.
    • A history DTC will clear after 50 ignition cycles.

Diagnostic Aids

DTC B1292, B1293, B1294, B1395, B1420, B3250, B3260 or any combination of these DTCs may be set due to an overcinch condition in which the sliding door motor may continue to run for up to 3 seconds after the door is fully closed. Reference any power sliding door overcinching bulletins first before performing any extensive power sliding door diagnostics.

Reference Information

Schematic Reference

Sliding Door Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Power Sliding Door (PSD) Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON, observe the scan tool PSD Position Sensor 1 and PSD Position Sensor 2 parameters while manually opening and closing the sliding door. The counts should vary while the sliding door is opening and closing.

Circuit/System Testing

  1. Ignition OFF, disconnect the X2 harness connector at the appropriate power sliding door module.
  2. Ignition OFF, test for less than 10 ohms between the low reference terminal 13 at the power sliding door module and ground.
  3. If greater than the specified range, replace the power sliding door module.
  4. Ignition ON, test for 4.8-5.2 volts between 5-volt reference terminal 12 at the power sliding door module and ground.
  5. If greater than the specified value, replace the power sliding door module.
  6. Test for 4.8-5.2 volts between the sensor 1 signal terminal 10 and low reference terminal 13 at the power sliding door module.
  7. If not the specified range, replace the power sliding door module.
  8. Test for 4.8-5.2 volts between the sensor 2 signal terminal 11 and low reference terminal 13 at the power sliding door module.
  9. If not the specified range, replace the power sliding door module.
  10. If all circuits test normal, test or replace the sliding door motor assembly.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for PSDM replacement, programming, and setup.