For 1990-2009 cars

### Circuit Description

The BCM and IRC monitor their input voltage to determine if it is between 9.0-15.5 V.

### Conditions for Setting the DTC

The DTC B1983 sets when the battery voltage falls below 9.0 volts.

### Action Taken When the DTC Sets

The module stores DTC B1983 as current.

### Conditions for Clearing the DTC

In order to clear the DTC from a current status the voltage shall be greater than 9.5 volts for 1.2 seconds.

### Test Description

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

1. Tests for the proper operation of the complete circuit.

2. Tests for the proper operation of the battery positive voltage circuit.

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
Schematic Reference: Control Module References in Body Control System or Radio/Audio System Schematics in Entertainment
1 | Did you perform the Diagnostic System Check for Engine Electrical? | -- | Go to Step 2 | Go to Diagnostic System Check - Engine Electrical
2 |

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. With a scan tool, observe the Battery Voltage in the affected module data list and record.

Does the scan tool indicate the battery voltage is above the specified value?

9.5 Volts

Go to Step 7

Go to Step 3

3 |

1. Turn OFF the ignition.
2. Disconnect the affected module. Refer to Control Module References in Body Control System.
3. Measure the voltage from the battery positive voltage circuit of the affected module to the ground circuit of the affected module.

Does the voltage measure near the value recorded in step 2?

--

Go to Charging System Test

Go to Step 4

4 | Measure the voltage from the battery positive voltage circuit of the affected module to a good ground. Does the voltage measure near the value recorded in step 2? | -- | Go to Step 6 | Go to Step 5
5 | Test the battery positive voltage circuit of the affected module for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 9 | Go to Step 7
6 | Test the ground circuit of the affected module for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 9 | Go to Step 8
7 | Inspect for poor connections at the harness connector of the affected module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 9 | Go to Step 8
8 | Important: Perform the setup procedure for the affected module if applicable. Replace the affected module. Refer to Control Module References in Body Control System. Did you complete the replacement? | -- | Go to Step 9 | --
9 |

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