Hello, is this car equipped with a battery temperature sensor. Located under the battery? Heres the resistance test: Disconnect the heater blanket from the vehicles electrical system. Using an Ohmmeter, connect the leads across the two wire terminals coming from the heater blanket. A resistance value of 220 to 280 ohms should be present. If not replace the blanket. And is there any diagnostic trouble codes stored? The light is turned on by a PCI BUS circuit, with the voltage regulator built into the ECM.
Heres some other info I found in All Data:
The PCM uses the ambient air temperature sensor to control the charge system voltage. This temperature, along with data from monitored line voltage, is used by the PCM to vary the battery charging rate. The system voltage is higher at cold temperatures and is gradually reduced as the calculated battery temperature increases.
The ambient temperature sensor is used to control the battery voltage based upon ambient temperature (approximation of battery temperature). The PCM maintains the optimal output of the generator by monitoring battery voltage and controlling it to a range of 13.5 - 14.7 volts based on battery temperature.
Wednesday, July 29th, 2020 AT 2:35 PM