Some 2014 – 2018 model year Highlander and Highlander Hybrid vehicles may exhibit one or more of the following conditions.
* Various drivability concerns
* Low or no fuel pressure
* Diagnostic Trouble Codes (DTCs) (Including but not limited to P1603, P1604, P1605, P0171, P0300, P0302, P0304, U0100)
* Some 2014 – 2018 model year Highlander Hybrid vehicles may exhibit DTC P134A
These conditions may be caused by corrosion/water in the A43 ECM connector (Highlander) or the A9 inverter water pump connector (Highlander HV). The corrosion in the A43 and A9 connectors is due to poorly sealed or damaged aftermarket windshield deicer harnesses. Follow the Repair Procedure in bulletin T-SB-0072-19 to address these conditions.
1. Confirm if one or more of the following conditions exist.
* Various drivability concerns
* Low or no fuel pressure
* DTCs (Including but not limited to P1603, P1604, P1605, P0171, P0300, P0302, P0304, and U0100) (Highlander only)
* DTC P314A (Highlander HV only)
Does the vehicle exhibit any of the conditions listed above?
* YES — Continue to step 2.
* NO — This bulletin does NOT apply. Continue diagnosis using the applicable Repair Manual.
2. Is the vehicle a hybrid model (Highlander HV)?
* YES — Go to step 4.
* NO — Continue to step 3.
3. Check for corrosion in the A43 ECM connector.
Remove the A43 ECM connector.
Is corrosion or water present?
* YES — Go to step 5.
* NO — This bulletin does NOT apply. Continue diagnosis using the applicable Repair Manual.
4. Remove the A9 inverter water pump with motor assembly connector.
Is corrosion or water present?
* YES — Continue to step 5.
* NO — This bulletin does NOT apply. Continue diagnosis using the applicable Repair Manual
5. Check for corrosion in the A33 front wiper deicer (windshield glass) connector (Highlander and Highlander HV).
Remove the A33 front wiper deicer (windshield glass) connector.
Is corrosion or water present?
* YES — Continue to step 6.
* NO — This bulletin does NOT apply. Continue diagnosis using the applicable Repair Manual.
6. Replace the components listed in the table below.
NON-HYBRID VEHICLE : ECM, Engine Room Main Wire Harness and Windshield
HYBRID VEHICLE : Inverter Water Pump, Engine Room Main Wire Harness, Windshield
Windshield Replacement Note:
It is strongly recommended to replace the windshield with a Toyota genuine windshield. Toyota windshields utilize special seals to prevent water/moisture from entering the engine room main wire harness. Some aftermarket windshields do NOT have these seals.
7. Test-drive the vehicle to confirm the repair and normal operation.
* Various drivability concerns
* Low or no fuel pressure
* Diagnostic Trouble Codes (DTCs) (Including but not limited to P1603, P1604, P1605, P0171, P0300, P0302, P0304, U0100)
* Some 2014 – 2018 model year Highlander Hybrid vehicles may exhibit DTC P134A
These conditions may be caused by corrosion/water in the A43 ECM connector (Highlander) or the A9 inverter water pump connector (Highlander HV). The corrosion in the A43 and A9 connectors is due to poorly sealed or damaged aftermarket windshield deicer harnesses. Follow the Repair Procedure in bulletin T-SB-0072-19 to address these conditions.
1. Confirm if one or more of the following conditions exist.
* Various drivability concerns
* Low or no fuel pressure
* DTCs (Including but not limited to P1603, P1604, P1605, P0171, P0300, P0302, P0304, and U0100) (Highlander only)
* DTC P314A (Highlander HV only)
Does the vehicle exhibit any of the conditions listed above?
* YES — Continue to step 2.
* NO — This bulletin does NOT apply. Continue diagnosis using the applicable Repair Manual.
2. Is the vehicle a hybrid model (Highlander HV)?
* YES — Go to step 4.
* NO — Continue to step 3.
3. Check for corrosion in the A43 ECM connector.
Remove the A43 ECM connector.
Is corrosion or water present?
* YES — Go to step 5.
* NO — This bulletin does NOT apply. Continue diagnosis using the applicable Repair Manual.
4. Remove the A9 inverter water pump with motor assembly connector.
Is corrosion or water present?
* YES — Continue to step 5.
* NO — This bulletin does NOT apply. Continue diagnosis using the applicable Repair Manual
5. Check for corrosion in the A33 front wiper deicer (windshield glass) connector (Highlander and Highlander HV).
Remove the A33 front wiper deicer (windshield glass) connector.
Is corrosion or water present?
* YES — Continue to step 6.
* NO — This bulletin does NOT apply. Continue diagnosis using the applicable Repair Manual.
6. Replace the components listed in the table below.
NON-HYBRID VEHICLE : ECM, Engine Room Main Wire Harness and Windshield
HYBRID VEHICLE : Inverter Water Pump, Engine Room Main Wire Harness, Windshield
Windshield Replacement Note:
It is strongly recommended to replace the windshield with a Toyota genuine windshield. Toyota windshields utilize special seals to prevent water/moisture from entering the engine room main wire harness. Some aftermarket windshields do NOT have these seals.
7. Test-drive the vehicle to confirm the repair and normal operation.