GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1998 🢒 Park Avenue 🢒 Body and Accessories 🢒 Seats 🢒 DTC B1982 Source/Battery Voltage High

Object Number: 456253 Size: MF
Power and Grounding Connector End Views
Memory Seats Schematics
Power Seat Systems Components
Power Distribution Schematics
Handling ESD Sensitive Parts Notice
Power Seat Connector End Views
Power Distribution Schematics

Circuit Description

Battery positive voltage (B+) is applied at the memory seat module (MSM) via CKT 2040 (ORN). The MSM tests the battery positive voltage (B+) in order to determine if the voltage is within a valid operating range.

Conditions for Setting the DTC

DTC MSM B1982 sets when the battery positive voltage (B+) is above 15.5 volts.

Action Taken When the DTC Sets

The MSM will try to write the status of the DTC to EEPROM. No other status will write to EEPROM while the DTC is current.

Conditions for Clearing the DTC

DTC MSM B1982 will clear when the battery positive voltage (B+) is less than 15 volts.

Diagnostic Aids
    • DTC MSM B1982 will disable the setting of most other MSM DTCs.
    • DTC MSM B1982 may set when the battery is fast charging for a long period of time.

Test Description

The number(s) below refer to the step number(s) on the diagnostic table.

  1. This test ensures that the DTC did not set falsely.

    2.

  2. This test determines if the malfunction is in the charging system or the MSM.

Step

Action

Value(s)

Yes

No

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. Connect a Scan Tool to the data link connector (DLC).
  2. Turn the ignition switch to the RUN position.
  3. Select DATA from the memory seat module (MSM) DATA LIST.

Is the voltage within the specified range?

9 V - 15.5 V

Go to Step 5

Go to Step 3

3

  1. Disconnect MSM connector C1.
  2. Connect a J 39200 digital multimeter (DMM) from MSM connector  C1 to one of the following cavities and ground:
    3. • Without W01, connect to cavity B11 (ORN).
    • With W01, connect to cavity D11 (ORN).

Is the voltage within the specified range?

9 V - 15.5 V

Go to Step 5

Go to Step 4

4

Repair the charging system. Refer to Charging System Check in Engine Electrical.

Is the repair complete?

--

Go to Step 7

--

5
  1. Clear the DTCs.
  2. Cycle the ignition.

Is the DTC set?

--

Go to Step 6

Go to Step 7

6

Replace the MSM. Refer to Memory Seat Control Module Replacement .

Is the MSM replacement complete?

--

Go to Step 7

--

7
  1. Clear the DTCs from memory.
  2. Perform the Diagnostic System Check. Refer to Diagnostic System Check - Power Seat Systems .

Did you clear the DTCs and perform the Power Seat Systems Diagnostic System Check?

--

Go to Diagnostic System Check - Power Seat Systems

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