News Technical Service Bulletins

Toyota HV Inverter Water Pump Issue

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Toyota Higlander Hybrid TSB 01.jpg

Check for corrosion at the inverter water pump A9 connector in the engine main wire harness.

This bulletin applies to 2014-2016 Toyota Highlander hybrid vehicles. A MIL may be on, accompanied by DTC P314A and/or P0C73 with evidence of water (corrosion) at the A9 inverter water pump connector.

Toyota Higlander Hybrid TSB 02.jpgThe deicer harness is located in the cowl area.


This may be caused by vehicles being equipped with an aftermarket windshield assembly with a poorly seated or damaged deicer harness. Water can enter through the deicer harness, wick down to the common shared ground junction A72 and then wick from the A72 ground connector to the inverter water pump connector.

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