GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1999 🢒 Seville 🢒 DTC 🢒 DTC B1983 Device Power 1 Circuit Low

Refer to

Cell 51: DIM Power and Ground


Object Number: 383449 Size: FS
Cell 10: IGN, SW, HTDST LR, HTDST RR, and HTDST RF Fuses
Body Control Module Components
Body Control System Circuit Description
Cell 51: DIM Ignition Inputs
Cell 50: Class 2 Serial Data Line (LH Drive)
Cell 14: G201 (1 of 3)
 and

Cell 51: DIM Inputs and Outputs (2 of 2)
Object Number: 154532 Size: FS
Steering Wheel Controls Schematics
Horn Schematics
Theft Deterrent System Schematics
Wiper/Washer System (Pulse) Schematics
Interior Lights Dimming Schematics
Cell 67
Body Control Module Components
Body Control System Circuit Description
Cell 51: IPM Power and Ground
Cell 51: DIM Inputs and Outputs (1 of 2)
Handling ESD Sensitive Parts Notice
 .

Circuit Description

    • The Dash Integration Module (DIM), battery positive voltage (B+) is supplied to the DIM on CKT 540 (ORN) at connector C1 terminal G. The DIM monitors this voltage to determine if it is within a valid operating range.
    • The instrument panel integration module (IPM), battery positive voltage (B+) is supplied to the IPM at connector C1, terminal C1, CKT 440 (ORN). The IPM monitors battery voltage sent by Class 2 message by the DIM 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

    • The module stores a DTC B1983 in the module memory.
    • The module will not respond to inputs when DTC B1983 is current.
    • No driver warning message is displayed for this DTC.
    • The module will not set DTCs when DTC B1983 is current.

Conditions for Clearing the DTC

    • A current DTC clears (status changes from current to history) if the battery positive voltage (B+) level rises above 9.5  volts for approximately 1  seconds.
    • A history DTC clears after 50 consecutive ignition cycles if the condition for the malfunction is no longer present.

Diagnostic Aids

The module will not check for low battery positive voltage (B+) during and for 2 seconds following the engine CRANK mode.

Step

Action

Value(s)

Yes

No

1

Was the Body Control Module Diagnostic System Check performed?

--

Go to Step 2

Go to the Diagnostic System Check - Body Control System

2
  1. Turn ON the ignition switch.
  2. Clear DTC's.
  3. Turn OFF the ignition switch.
  4. Turn ON the ignition switch, engine running.
  5. Check for DTC's.

Is the DTC still present?

--

Go to Step 4

Go to Step 3

3

Did more than one module have a voltage low DTC prior to clearing?

--

Go to Charging System Check in Engine Electrical

Go to Step 9

4

Is the DTC only set in the IPM?

--

Go to Step 8

Go to Step 5

5
  1. Turn ON the ignition switch.
  2. Connect a scan tool.
  3. Select DATA from the DATA LIST of the DIM.

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

9 V

Go to Step 7

Go to Step 6

6
  1. Turn OFF the ignition switch.
  2. Disconnect the DIM connector C1.
  3. Disconnect the IPM connector C1 measure the voltage between the DIM connector C1 terminal G and ground.
  4. Measure the voltage between the IPM connector C1 terminal C and ground.

Is the voltage greater than the specified value?

9 V

Go to Step 7

Go to Charging System Check in Engine Electrical

7

Replace the DIM.

Is the repair complete?

--

Go to Step 9

--

8

Replace the IPM.

Is the repair complete?

--

Go to Step 9

--

9
  1. Turn OFF the ignition switch.
  2. Reconnect or install any connectors or components that were disconnected or removed.
  3. Turn ON the ignition switch.
  4. Clear any DTCs.

Are all DTCs cleared?

--

Go to the Diagnostic System Check - Body Control System

--