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For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1998 🢒 Seville 🢒 DTC 🢒 DTC B1983 Source/Battery Voltage Low

Object Number: 259745 Size: LF
Cellular Communication Components
Cell 153: Power and Grounds
Handling ESD Sensitive Parts Notice
Cellular Communication Schematic References
Cellular Communication Schematic References

Circuit Description

Battery Positive Voltage (B+) is supplied to the cellular telephone module connector on CKT 2240 (ORN) at terminals 4 and 16. The module monitors this voltage to determine if it is within a valid operating range.

Conditions for Setting the DTC

The Battery Positive Voltage (B+) level falls below 9 volts for approximately 1.2 seconds or more.

Action Taken When the DTC Sets
    • Stores a DTC B1983 in the module memory.
    • The module does not respond to any inputs when the voltage is less than 9 volts
    • No driver warning message will be displayed for this DTC.
    • Other module DTCs will not set while DTC B1983 is current.

Conditions for Clearing the DTC
    • A current DTC clears (staus changes from current to history) if the battery positive voltage (B+) level rises above 9.5 volts for approximately 1.2 seconds.
    • Use the On-Board clearing DTCs feature.
    • A history DTC clears after 50 consecutive ignition cycles if the condition for the malfunction is no longer present.
    • Use the On-Board clearing DTC's feature.
    • Use a scan tool.

Diagnostic Aids

The module will not check for low Battery Positive Voltage (B+) during and for 2 seconds following the engine CRANK mode. This delay ensures that DTC B1983 will not erroneously set.

Test Description

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

  1. Perform the Diagnostic System Check before continuing with the diagnosis of this DTC.

    2.

  2. Checks that DTC was not erroneously set.

    3.

  3. Determines whether the malfunction is in the charging system or the module which set the DTC.

    4.

  4. Clear all DTCs after the repair procedure is complete.

DTC B1983 Battery Voltage Low

Step

Action

Value(s)

Yes

No

1

Was the Diagnostic System Check performed?

--

Go to Step 2

Go to Diagnostic System Check - Cellular Telephone

2
  1. Turn the ignition switch to ON.
  2. Clear DTCs.
  3. Turn the igntion switch to OFF.

Is the DTC still present?

--

Go to Step 4

Go to Step 3

3

Did more than one module have the DTC prior to clearing?

--

Go to Charging System Check in Engine Electrical

Go to Diagnostic System Check - Cellular Telephone

4

  1. Turn the ignition switch to ON.
  2. Connect a scan tool to the data link connector (DLC).
  3. Select DATA from the DATA LIST of the cellular telephone module.

Is the battery positive voltage (B+) less than the specified value?

9 V

Go to Step 6

Go to Step 5

5

  1. Turn the ignition switch to OFF.
  2. Disconnect the cellular telephone module connector.
  3. Using a DMM measure the voltage between the connector terminal 4 and ground, then terminal 16 and ground.

Is the measured voltage less than the specified value?

9 V

Go to Step 6

Go to Charging System Check in Engine Electrical

6

Replace the cellular telephone module. Refer to Radio Frequency Booster and Bracket Assembly Replacement .

Is the replacement complete?

--

Go to Step 7

--

7

  1. Turn the ignition switch to OFF.
  2. Reconnect or install any connectors or components that were disconnected or removed.
  3. Turn on the ignition switch.
  4. Clear any DTCs. Refer to Clearing DTCs .

Are all DTCs cleared?

--

Go to Diagnostic System Check - Cellular Telephone

--