GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 2003 🢒 Park Avenue 🢒 Body and Accessories 🢒 Seats 🢒 DTC B2240-B2242

Circuit Description

The memory function switches are normally open and are wired to the driver door switch assembly (DDSA). When a memory recall switch is pressed, the switch pulls the 5 volt circuit from the DDSA low. The DDSA senses that a memory recall signal was pulled low and a class 2 message is sent out identifying that the circuit is active.

Conditions for Running the DTC

The DDM must be powered and can not have B1328-Battery Voltage High or B1327-Battery Voltage Low as active DTCs for this DTC to set.

Conditions for Setting the DTC

If a memory recall switch circuit is active for more than 30 continuous seconds, the driver door module (DDM) will set this DTC.

Action Taken When the DTC Sets

The DDM ignores the continuous signal from the DDSA for the memory function switch, rules it invalid, and will not respond to it. The DDM will respond to all other valid switch inputs.

Conditions for Clearing the DTC

The DTC automatically clears when the switch circuit setting this DTC is no longer active or the power to the DDM changes from OFF to ON.

Test Description

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

  1. Checks the existing state of the memory recall switch number by using the current state of the switch signal parameter.

Step

Action

Yes

No

Schematic Reference: Memory Seats Schematics

Connector End View Reference: Power Seat Connector End Views or Power Door Systems Connector End Views in Doors

1

Did you perform the Diagnostic System Check-Power Seat Systems?

Go to Step 2

Go to Diagnostic System Check - Power Seat Systems

2

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the Memory Recall Switches parameter in the Driver Door Module data list.

Does the scan tool display Idle?

Go to Step 3

Go to Step 4

3
  1. With a scan tool, observe the Memory Recall Switches parameter.
  2. Activate the appropriate memory recall switch.

Does the Memory Recall Switches 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 memory function switch harness connector.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the Memory Recall Switches parameter.

Does the scan tool display Idle?

Go to Step  7

Go to Step 5

5

Test the appropriate memory switch signal circuit 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 10

Go to Step 6

6

Inspect for poor connections at the harness connector of the driver door switch assembly. 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 memory function 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 driver door switch assembly. Refer to Front Door Switch Replacement in Doors.

Did you complete the replacement?

Go to Step 10

--

9

Replace the memory function switch. Refer to Driver Seat Adjuster Memory Switch Replacement .

Did you complete the replacement?

Go to Step 10

--

10
  1. Clear the DTCs using the scan tool.
  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