GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2007 🢒 XLR 🢒 Driver Information and Entertainment 🢒 Cellular, Entertainment, and Navigation 🢒 DTC B2757, B2762, B2767, or B2772

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 signal circuit from the DDSA low. The DDSA senses that a memory recall signal was pulled low and a serial data message is sent out identifying the memory request. The memory seat module (MSM)/driver position module (DPM) then commands the driver seat to move in response to the memory request.

DTC Descriptors

This diagnostic procedure supports the following DTCs:

    • DTC B2757 Memory 1 Select Switch Circuit Low
    • DTC B2762 Memory 2 Select Switch Circuit Low

Conditions for Running the DTC

The DDSA 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 is active for 30 continuous seconds, the switch will be considered shorted, and the DDSA will set this DTC.

Action Taken When the DTC Sets
    • Current and history codes are set.
    • All memory recall commands are ignored.
    • The DDSA will respond to any other valid switch inputs.

Conditions for Clearing the DTC
    • The DTC automatically clears when the switch circuit setting the DTC is no longer active.
    • The DDSA will clear the history DTC after 50 fault-free ignition cycles.

Diagnostic Aids

The MSM is also known as the DPM for this vehicle.

Test Description

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

  1. This step checks the existing state of the memory switch by using the current state of the switch parameter.

    2.

  2. This step verifies the repair.

Step

Action

Yes

No

Schematic Reference: Driver Seat Schematics

Connector End View Reference: Power Seat Connector End Views

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle

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 Switch 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 switch.

Does the Memory Recall Switches parameter change state?

Go to Testing for Intermittent Conditions and Poor Connections

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 switch signal circuit that displays active for a short to ground. Refer to Circuit Testing and Wiring Repairs .

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 (DDSA). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .

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 .

Did you find and correct the condition?

Go to Step 10

Go to Step 9

8

Replace the DDSA. Refer to CELL LINK .

Did you complete the replacement?

Go to Step 10

--

9

Replace the memory function switch. Refer to CELL LINK 154620 .

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