GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1999 🢒 Park Avenue 🢒 Body and Accessories 🢒 Seats 🢒 DTC B1983 Source/Battery Voltage Low

Object Number: 323996 Size: MF
Power Seat Systems Components
Memory Seats Schematics
Power Distribution Schematics
Power Distribution Schematics
Power Seat Connector End Views
Power Seat Connector End Views
Handling ESD Sensitive Parts Notice

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 B1983 sets when the battery positive voltage (B+) falls below 9 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 B1983 will clear when the battery positive voltage (B+) is greater than 9.5 volts.

Diagnostic Aids

DTC MSM B1983 will disable the setting of most other MSM DTCs.

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

Did you complete the repair?

--

Go to Step 7

--

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

Did the DTC set?

--

Go to Step 6

Go to Step 7

6

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

Did you complete the repair?

--

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?

--

System OK

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