lost honda pro
NAXJA Forum User
- Location
- Gainesville, FL
I understand this issue has been covered a few times, not nearly as much as the damned Taurus fan, but I still haven't found a viable solution. Yes, I searched.
For those of us with 97+ XJs, the auxiliary fan is controlled by the ECM. From what I understand, the ECM supplies a hot voltage to the ground side of the coil in the fan relay whenever it is off, and provides a ground path whenever it wants the fan on. The other side of the coil always has +12 V, so as soon as the ECM gives it a ground, the current flows, and the relay activates.
Obviously, you can't wire in a switch that grounds the wire, or you'll get a CEL. And I'd like to have the ability for the ECM to override my switch. Has anyone come up with such a circuit?
I know I could just but another relay and some 10 gauge, but I'd rather work with the system I have.
TIA for any insight,
Tim
For those of us with 97+ XJs, the auxiliary fan is controlled by the ECM. From what I understand, the ECM supplies a hot voltage to the ground side of the coil in the fan relay whenever it is off, and provides a ground path whenever it wants the fan on. The other side of the coil always has +12 V, so as soon as the ECM gives it a ground, the current flows, and the relay activates.
Obviously, you can't wire in a switch that grounds the wire, or you'll get a CEL. And I'd like to have the ability for the ECM to override my switch. Has anyone come up with such a circuit?
I know I could just but another relay and some 10 gauge, but I'd rather work with the system I have.
TIA for any insight,
Tim