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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 223 (Seat System) >> Diagnostic Information and Procedures >> DTC B1770, B1775, B1780, B1785, B1790, B1805 or B2415: Driver Seat Motor(s) Malfunction(s) >> Test Description

Test Description

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 3:  Tests for the proper operation of the circuit in the low voltage range.
  2. 4:  Tests for the proper operation of the circuit in the high voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to ground.
  3. 5:  Tests for a short to voltage in the 5-volt reference circuit.
  4. 6:  Tests for a high resistance or an open in the sensor low reference circuit.
  5. 16:  This step verifies the repair.
DTC B1770, B1775, B1780, B1785, B1790, B1805 or B2415: Driver Seat Motor(s) Malfunction(s)

Step Action Values Yes No
Schematic Reference: Driver Seat Schematics 
Connector End View Reference: Power Seat Systems Connector End Views 
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
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 Sensor data list.
Does the scan tool indicate that the Sensor parameter is within the specified range?		 0.25-4.75 V Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 3 
3 
  1. Turn OFF the ignition.
  2. Disconnect the appropriate sensor harness connector.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the Sensor parameter.
Does the scan tool indicate that the Sensor parameter is less than the specified value?		 2 V Go to Step 4  Go to Step 10 
4 
  1. Turn OFF the ignition.
  2. Connect a 3-amp fused jumper wire between the 5-volt reference circuit of the sensor connector and the signal 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 greater than the specified value?		 4.75 V Go to Step 5  Go to Step 8 
5 
  1. Disconnect the fused jumper wire.
  2. Measure the voltage between the 5-volt reference circuit of the sensor connector and the low reference circuit of the sensor connector.
Does the voltage measure less than the specified value?		 5.5 V Go to Step 6  Go to Step 7 
6 
  1. Turn OFF the ignition.
  2. Disconnect the negative battery cable.
  3. Measure the resistance from the low reference circuit of the sensor to a good ground.
Does the resistance measure less than the specified value?		 5 Ω Go to Step 12  Go to Step 11 
7 Test the 5-volt reference circuit of the sensor for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 16  Go to Step 13 
8 Test the 5-volt reference circuit of the sensor for the following:
  • A short to ground
  • An open
  • High resistance

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 16  Go to Step 9 
9 Test the signal circuit of the sensor for the following:
  • A short to ground
  • An open
  • High resistance

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 16  Go to Step 13 
10 Test the signal circuit of the sensor for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 16  Go to Step 13 
11
  1. Disconnect the memory seat module (MSM) connector C2.
  2. Test the low reference circuit of the sensor for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 16  Go to Step 13 
12 Inspect for poor connections at the harness connector of the sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 16  Go to Step 14 
13 Inspect for poor connections at the harness connector of the MSM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 - Go to Step 16  Go to Step 15 
14 Replace the appropriate seat position sensor.
Did you complete the replacement?		 - Go to Step 16  -
15 Replace the MSM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup and programming.
Did you complete the replacement?		 - Go to Step 16  -
16 
  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
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