radio question

[Adam Sprague]

Radio cuts out when the voltage drops to 13.4 volts according to the display on my dash. Voltage continues to drop to 12.5.
I have had discussions before about the voltage and the alternator and how it works. So do I have a bad radio(again).
Car runs great.
Battery is over 4 yrs old. Time for a new one possibly

[AlanRubin]

The Camaro has 5 charge modes. From ~15.1 down to ~12.3
Modes:
Battery Sulfation Mode
Charge Mode
Fuel Economy Mode
Headlamp Mode
Start Up Mode
Voltage Reduction Mode

Commanded Duty Cycle & Generator Output Voltage:
10% 11 V
20% 11.56 V
30% 12.12 V
40% 12.68 V
50% 13.25 V
60% 13.81 V
70% 14.37 V
80% 14.94 V
90% 15.5 V

Battery Sulfation Mode
The BCM will enter this mode when the interpreted generator output voltage is less than 13.2 V for 45 minutes.
When this condition exists the BCM will enter Charge Mode for 2-3 minutes. The BCM will then determine
which mode to enter depending on voltage requirements.

Charge Mode
The BCM will enter Charge Mode when ever one of the following conditions are met.
 The wipers are ON for than 3 seconds.
 GMLAN (Climate Control Voltage Boost Mode Request) is true, as sensed by the HVAC control head.
High speed cooling fan, rear defogger and HVAC high speed blower operation can cause the BCM to
enter the Charge Mode.
 The estimated battery temperature is less than 0°C (32°F).
 Battery State of Charge is less than 80 percent.
 Vehicle speed is greater than 145 km/h (90 mph)
 Current sensor fault exists.
 System voltage was determined to be below 12.56 V

When any one of these conditions is met, the system will set targeted generator output voltage to a charging
voltage between 13.9-15.5 V, depending on the battery state of charge and estimated battery temperature.

Fuel Economy Mode
The BCM will enter Fuel Economy Mode when the estimated battery temperature is at least 0°C (32°F) but less
than or equal to 80°C (176°F), the calculated battery current is less than 15 amperes and greater than -8
amperes, and the battery state-of-charge is greater than or equal to 80 percent. Its targeted generator output
voltage is the open circuit voltage of the battery and can be between 12.5-13.1 V. The BCM will exit this mode
and enter Charge Mode when any of the conditions described above are present.

Headlamp Mode
The BCM will enter Headlamp Mode when ever the headlamps are ON (high or low beams). Voltage will be
regulated between 13.9-14.5 V.

Start Up Mode
When the engine is started the BCM sets a targeted generator output voltage of 14.5 V for 30 seconds.

Voltage Reduction Mode
The BCM will enter Voltage Reduction Mode when the calculated ambient air temperature is above 0°C (32°F).
The calculated battery current is less than 1 ampere and greater than -7 amperes, and the generator field duty
cycle is less than 99 percent. Its targeted generator output voltage is 12.9 V. The BCM will exit this mode once
the criteria are met for Charge Mode.



Mine has gone as low as 12.3, radio never cut out.

4 years, battery is probably on its way out.

Please Note: The cars DO come with AGM batteries from the factory. If you
check Rock Auto, they only offer AGM batteries as replacements.

[Adam Sprague]

Thank you for the information. Learning alot on here about my Camaro. Thank you AlanRubin.

[kirlin97]

Thank you AlanRubin. I got helpful info here.

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