Diagnosing HVAC Issue for the Rav4 EV

March 31, 2023
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).

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.

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