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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 B1735, B1740, B1745, B1750, B1755, B1760, B1815 or B1820: Front/Rear Seat Switch Circuit Problems >> 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. 2:  This step checks the existing state of the driver seat switch by using the current state of the seat switch parameter. If all of the seat switch parameters display active, possibly one of the seat switch signal circuits is shorted to voltage.
  2. 4:  When the seat switch is disconnected, this step determines if the seat switch contacts are stuck closed or if one of the switch signal circuits is possibly shorted to battery voltage.
DTC B1735, B1740, B1745, B1750, B1755, B1760, B1815 or B1820: Front/Rear Seat Switch Circuit Problems

Step Action 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 seat switch parameter in the Driver Position Module data list.
Does the scan tool display Inactive?		 Go to Step 3  Go to Step 4 
3
  1. With a scan tool, observe the appropriate seat switch parameter.
  2. Activate the appropriate seat switch.
Does the switch parameter change state?		 Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 4 
4 
  1. Turn OFF the ignition.
  2. Disconnect the seat adjuster switch harness connector.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe all of the switch parameters in the Driver Position Module data list.
Does the scan tool display Inactive for all of the switch parameters?		 Go to Step 7  Go to Step 5 
5 Test the switch signal circuit that displays active 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 10  Go to Step 6 
6 Inspect for poor connections at the harness connector of the memory seat module (MSM)/driver position module (DPM). 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 10  Go to Step 8 
7 Inspect for poor connections at the harness connector of the seat adjuster switch. 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 10  Go to Step 9 
8 Replace the MSM/DPM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup and programming.
Did you complete the replacement?		 Go to Step 10  -
9 Replace the seat adjuster switch. Refer to Seat Switch Replacement - Power .
Did you complete the replacement?		 Go to Step 10  -
10
  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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