GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2002 🢒 Rendezvous - FWD 🢒 Body and Accessories 🢒 Seats 🢒 DTC B1735, B1740, B1745, B1750, B1755, B1760, B1815, or B1820

Circuit Description

The seat adjuster switch is supplied a 12-volt reference circuit by the memory seat module. When a seat adjuster switch is pressed the signal circuit is closed to the 12-volt reference circuit. Closing the signal circuit to the 12-volt reference circuit pulls the signal circuit high indicating to the memory seat module the switch status is active.

Conditions for Running the DTC

The system voltage must be between 9.0 and 16.0 volts.

Conditions for Setting the DTC

A seat adjuster switch input to the memory seat module is active for more than 30 seconds.

Action Taken When the DTC Sets
    • The memory seat module will ignore the switch input for which a current status DTC is set.
    • When the fault is no longer present a history status DTC will be stored, and switch operation will be restored.

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 status code.
    • The history DTC will be cleared after 100 error free ignition cycles, or by using the scan tool clearing DTCs feature.

Test Description

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

  1. This step tests the seat adjuster switch for an internal fault.

  2. When the seat adjuster switch is disconnected the faulty switch signal circuit will be isolated.

Step

Action

Yes

No

Schematic Reference: Memory Seats Schematics

Connector End View Reference: Power Seat Connector End Views

1

Did you perform the Power Seat Systems Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Power Seat Systems

2

  1. Install a scan tool.
  2. Verify that the DTC is current.

Is the DTC current?

Go to Step 3

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

3

  1. Disconnect the seat adjuster switch connector.
  2. With a scan tool, observe the current DTCs.

Is the DTC current?

Go to Step 4

Go to Step 5

4

Test the switch signal circuit indicated in the previous step for a short to voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 9

Go to Step 6

5

Inspect and repair any damage to the seat adjuster switch connector and terminals which may cause the condition. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 9

Go to Step 7

6

Inspect and repair any damage to the memory seat module connector and terminals which may cause the condition. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 9

Go to Step 8

7

Replace the seat adjuster switch. Refer to Power Seat Switch Replacement .

Did you complete the replacement?

Go to Step 9

--

8

Replace the memory seat module. Refer to Memory Seat Control Module Replacement .

Did you complete the replacement?

Go to Step 9

--

9
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the system within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

Go to Step 2

System OK