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 the DTC
The battery positive voltage (B+) level rises above 15.5 volts for more than approximately 1.2 seconds.
Action Taken When the DTC Sets
| • | Stores DTC B1328 in the radio amplifier memory. |
| • | The radio amplifier does not respond to inputs when the voltage is greater than 16 volts |
| • | No driver warning message are displayed for this DTC. |
| • | Other radio amplifier DTCs do not set while DTC B1328 is current. |
Conditions for Clearing the DTC
The battery positive voltage (B+) level falls below 15 volts for approximately 1.2 seconds.
Diagnostic Aids
This DTC may set when the vehicle is placed on a battery charger, on fast charge, for a long period of time.
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 amplifier.
-
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+) less than the specified value? | 15.5 V | |||
Is the measured voltage greater than the specified value? | 15.5 V | Go to Charging System Check in Engine Electrical | ||
4 | Replace radio amplifier. Refer to Radio Speaker Amplifier Replacement . Is the replacement complete? | -- | -- | |
Are all DTCs cleared? | -- | -- |
