How do I test my HFL on my Acura MDX?
To test your HFL to see if it is the cause of your battery drain issue, switch your multimeter to DC amps. Disconnect the positive battery terminal and connect the negative lead from the multimeter to the positive battery terminal. The readout will tell you the current drain. Disconnect the HFL as noted below, then check your drain again.
When to disconnect HFL battery from Acura battery?
There is a simpler way, there are two hot wires once the ignition is on into the HFL unit. There is a white wire that stays hot and the unit is supposed to shut down in 10 min after the ignition is off, but the unit does not shot down. There is an ignition connected wire as well, nothing needs to be done to this one.
Can a faulty HFL module drain the battery?
While HFL provides a host of useful options, including steering wheel controls and cell phone functionality, it also creates a parasitic draw on your battery by running even when the car is off. This draw is not enough to cause any issues when the module is in good shape, but a faulty module can draw enough juice to repeatedly drain the battery.
What happens when you disconnect the HFL unit?
The relay will shut off thus the unit will not draw 1.42 amps from the battery. Do this even if you put in a new HFL unit since the HFL unit will cook if it stays on. To prevent cooking you can put on a trickle charger all the time the vehicle is in the garage.
To test your HFL to see if it is the cause of your battery drain issue, switch your multimeter to DC amps. Disconnect the positive battery terminal and connect the negative lead from the multimeter to the positive battery terminal. The readout will tell you the current drain. Disconnect the HFL as noted below, then check your drain again.
There is a simpler way, there are two hot wires once the ignition is on into the HFL unit. There is a white wire that stays hot and the unit is supposed to shut down in 10 min after the ignition is off, but the unit does not shot down. There is an ignition connected wire as well, nothing needs to be done to this one.
The relay will shut off thus the unit will not draw 1.42 amps from the battery. Do this even if you put in a new HFL unit since the HFL unit will cook if it stays on. To prevent cooking you can put on a trickle charger all the time the vehicle is in the garage.
While HFL provides a host of useful options, including steering wheel controls and cell phone functionality, it also creates a parasitic draw on your battery by running even when the car is off. This draw is not enough to cause any issues when the module is in good shape, but a faulty module can draw enough juice to repeatedly drain the battery.