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
| • | Stores a DTC B1983 in the IRC 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, this insures that DTC B1983 will not erroneously set.
Test Description
The numbers below refer to the step numbers on the diagnostic table:
-
Perform the Radio/Audio System Diagnostic System Check before continuing with the diagnosis of this DTC.
-
Checks that DTC was not set erroneously.
-
Determines whether the malfunction is in the charging system or the radio (IRC).
-
Clear all DTCs after the repair procedure is complete.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Was the Radio/Audio System Diagnostic System Check performed? | -- | |||
Is the battery positive voltage (B+) greater than the specified value? | 10.5 V | |||
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? | -- | -- | |
Are all DTCs cleared? | -- | -- |
