Entertainment System Diagnosis

DTC B1327 Battery/Source Voltage Low:

CIRCUIT DESCRIPTION
Battery positive voltage (B+) is supplied to the radio amplifier on CKT 1242 (RED). The radio amplifier monitors this voltage to determine if it is within a valid operating range.

CONDITIONS FOR SETTING DTC
The battery positive voltage (B+) level falls below 10.5 volts for approximately 1.2 seconds or more.

ACTION TAKEN WHEN THE DTC SETS
^ The radio amplifier stores a DTC B1327 in memory.
^ The radio amplifier does not respond to inputs when the voltage is less than 10.5 volts.
^ No driver warning message are displayed for this DTC.
^ Other radio amplifier DTCs do not set while DTC B1327 is current.

CONDITIONS FOR CLEARING DTC
The battery positive voltage (B+) level rises above 10.5 volts for approximately 1.2 seconds.

DIAGNOSTIC AIDS
The radio amplifier does not check for low battery positive voltage (B+) during and for 2 seconds following the engine CRANK mode.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table:
1. Perform the Radio/Audio System Diagnostic System Check before continuing with the diagnosis of this DTC.
2. Checks that DTC was not set erroneously.
3. Determines whether the malfunction is in the charging system or the radio amplifier.
5. Clear all DTCs after the repair procedure is complete.