Refer to Radio/Audio System Schematics:
Circuit Description
Battery positive voltage (B+) is supplied via CKT 2240 (ORN) to the radio (IRC) at terminal F1. The radio monitors this voltage to determine if it is within a valid operating range.
Conditions for Setting the DTC
The battery positive voltage (B+) falls below 10.5 volts for approximately 1.2 seconds or more.
Action Taken When the DTC Sets
| • | The radio stores a DTC B1983 in its memory. |
| • | The radio does not respond to inputs when the voltage is less than 9 volts. |
| • | No driver warning message is displayed for this DTC. |
Conditions for Clearing the DTC
The battery positive voltage (B+) level rises above 9.5 volts for approximately 1.2 seconds.
Diagnostic Aids
The IRC 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 Radio/Audio System Diagnostic System Check performed? | -- | ||
2 |
Is the battery positive voltage (B+) greater than the specified value? | 10.5 V | ||
3 |
Is the measured voltage less than the specified value? | 10.5 V | Go to Charging System Check in Engine Electrical | |
4 | Replace the radio. Refer to Radio Replacement . Is the replacement complete? | -- | -- | |
5 |
Are all DTCs cleared? | -- | -- |
