Can a T91 telestart control a Discovery 3 FBH?
This is because Discovery 3 FBH’s firmware ignores commands from the Telestart. It will control the Discovery 4 FBH, as a T91 Telestart system is a factory option (Remote Park Heater). The D4 is fitted with a ThermoTop V EVO FBH, different from the D3 ThermoTop V and using different firmware.
What does a park heater do on a Discovery 3?
Park heating is when the FBH is operated with the vehicle engine off, to warm up the engine coolant. Very early Discovery 3’s had park heater settings in the Settings Menu but this was removed as part of the Enhancement Programme in 2005. There are many ways to retrofit park heater functionality to the D3’s FBH.
Where is the control wire on a Discovery 3?
Only the very earliest Discovery 3’s are factory-fitted with a WBUS control wire in pin 2 of the 8-pin FBH connector (a leftover from the deleted Settings menu functionality). This is the red wire in the photo on the left below.