For 1990-2009 cars

## DTC B1983 Device Power 1 Circuit Low Source Battery Voltage Low

### Circuit Description

B+ is supplied to the Integrated Radio Controller (IRC) by the BCM low power drive output on circuit A52. The IRC monitors this voltage to determine if it is within the valid operating range.

### Conditions for Setting the DTC

DTC B1983 will set if the input voltage into the IRC falls below 9.5 volts for approximately 1.2 seconds.

### Action Taken When the DTC Sets

• | DTC B1983 will be stored in the IRC memory.

• | The IRC will not respond to any manual or memory inputs when the voltage is below 9.5 volts.

• | No driver warning message will be displayed for this DTC.

### Conditions for Clearing the DTC

• | DTC B1983 will clear when the voltage level rises above 9.5 volts for approximately 1.2 seconds.

• | DTC B1983 can also be cleared by using the scan tool.

### Diagnostic Aids

The IRC will not check the voltage level on this circuit for approximately 2 seconds following the engine crank mode. This insures that DTC B1983 will not erroneously set.

### Test Description

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

1. This step checks the voltage at terminal F1 of the radio by using the scan tool.

2. This step replaces the radio.

#### DTC B1983 Source Battery Voltage Low

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the Radio/Audio System Diagnostic System Check performed? | -- | Go to Step 2 | Go to Diagnostic System Check - Radio/Audio System .
2 |

1. Install the scan tool.
2. Turn the ignition switch to the ON position.
3. Select DATA from the IRC data list.
4. View the battery voltage into the IRC.

Is the battery voltage greater than the specified value?

9.5 V

Go to Step 4

Go to Step 3

3 | Go to DTC B1983 Source/Battery Voltage Low for diagnosis of the low voltage malfunction. | -- | -- | --
4 | Replace the radio. Refer to Radio Replacement in Entertainment. Is the replacement complete? | -- | Go to Step 5 | --
5 |

1. Connect all connectors and components that were disconnected.
2. Install the scan tool.
3. Verify that DTC B1983 is not present and that the radio operates properly.

Does the radio operate properly?

--

System OK

Go to Step 1