T-TT-0496-18

Service Bulletin Details

Public Details for: T-TT-0496-18

Tt: vehicles may experience a mil on condition exhibiting codes P314A and/or P0C73 with evidence of water (corrosion) at the a9 inverter water pump connector. This condition may be caused by vehicles being equipped with an aftermarket winds


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Models from 2016
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Models from 2015
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Models from 2014
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Tech Tip T-TT-0496-18
May 01, 2018
Subject
Market
MIL ON P314A and/or P0C73, Corrosion Present in A9
Inverter Water Pump Connector
USA
Service Category
Section
Vehicle Interior
Meter/Gauge/Display
Applicability
14-16MY Highlander HV14-2016MY Highlander HV
APPLICABLE VEHICLES
2014-2016
Highlander HV
CONDITION
Vehicles may experience a MIL ON condition exhibiting codes P314A and/or P0C73 with evidence of
water (corrosion) at the A9 inverter water pump connector. This condition may be caused by vehicles
being equipped with an aftermarket windshield assembly with a poorly sealed or damaged deicer
harness.
Water can enter in through deicer harness, wick down to the common shared ground junction A72 and
then wick from the A72 ground connector to inverter water pump connecter.
Corrosion at W/P
Windshield Deicer Harness (Located in cowl area):
Expires on
Ver. 2.9 01/01/2018 T
05/01/2019
© 2018, Toyota Motor Sales, USA
Page 1 of 2
Tech Tip T-TT-0496-18
May 01, 2018
Subject
Market
MIL ON P314A and/or P0C73, Corrosion Present in A9
Inverter Water Pump Connector
USA
Applicability
Aftermarket deicer connection at windshield
example:
Toyota genuine deicer connection at windshield
harness example:
RECOMMENDATIONS
If corrosion is found at the A9 inverter water pump connector, the following is recommended:
1) Inspect A33 windshield deicer connection-to-engine main wire harness for evidence of
corrosion.
2) Check if windshield is non-genuine Toyota windshield. Toyota genuine windshields will have a
“Toyota” marking on label and a Toyota part number on the deicer harness. The deicer harness
and windshield come as an assembled unit.
3) Toyota recommends that windshields only be replaced with Toyota genuine parts. Toyota
genuine windshields are equipped with seals for prevention of water intrusion to the engine
room main wire harness.
4) If corrosion is found in the A33 connector and the windshield is a Toyota genuine part, please
contact TAS.
LINK REFERENCES
This Tech Tip does not contain any link references
Expires on
Ver. 2.9 01/01/2018 T
05/01/2019
© 2018, Toyota Motor Sales, USA
Page 2 of 2

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