Some 2012-2014 Toyota RAV4 EV vehicles may experience a lack of heat from the HVAC system. An updated PTC heater is available to address this concern (electric heater sub-assembly P/N 8701-42010) and DC/DC converter assembly P/N G9270-0R011).
Remove the service plug (be sure to refer to TIS for the procedure (engine/hybrid system – hybrid/battery control system – hybrid/battery control: Service Plug Grip: Removal).
Disconnect the PTC cabin heater connector. Inspect the resistance of the heater sub-assembly between pins 1 and 2 using a standard DVOM (do not use a mega ohm tester).
Check the heater sub-assembly resistance by placing the positive lead of the DVOM on terminal 2 and the negative lead on terminal 1 of the PTC connector (incorrect polarity will give an inaccurate reading).
If resistance is below 500Kohm, the DC/DC converter will need to be inspected. Check resistance of the DC/DC converter between the positive terminal of the cabin heater and the positive terminal of the HV power supply.
If the circuit is open (O/L) then the heater sub-assembly and the DC/DC converter need to be replaced.
If the circuit is not open, this bulletin does not apply. Continue diagnosis using the applicable repair manual.
ART: TOY (courtesy Mitchell1)
CAPTION: Checking resistance of the DC/DC converter.
