T-SB-0072-19

T-SB-0072-19
June 24, 2019
Various Drivability Concerns, and/or DTCs, Corrosion
Present in A43 or A9 Connector
Service
Category
Engine/Hybrid System
Section
Engine Control
Market USA
Applicability
YEAR(S)
MODEL(S)
2014 - 2018
Highlander, Highlander HV
ADDITIONAL INFORMATION
Introduction
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 this bulletin to address these conditions.
Warranty Information
OP CODE
DESCRIPTION
TIME
OFP
T1
T2
N/A
Not Applicable to Warranty
–
–
–
–
© 2019 Toyota Motor Sales, USA
Page 1 of 6
T-SB-0072-19
June 24, 2019
Page 2 of 6
Various Drivability Concerns, and/or DTCs, Corrosion Present in A43 or A9
Connector
Repair Procedure
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.
Figure 1. A43 Connector Location and Corrosion
Is corrosion or water present?
 YES — Go to step 5.

NO — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
© 2019 Toyota Motor Sales, USA
T-SB-0072-19
June 24, 2019
Page 3 of 6
Various Drivability Concerns, and/or DTCs, Corrosion Present in A43 or A9
Connector
Repair Procedure (continued)
4. Remove the A9 inverter water pump with motor assembly connector.
Figure 2. A9 Connector Location and Corrosion
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.
Figure 3. A33 Connector Location and Corrosion
Is corrosion or water present?
 YES — Continue to step 6.

NO — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
© 2019 Toyota Motor Sales, USA
T-SB-0072-19
June 24, 2019
Page 4 of 6
Various Drivability Concerns, and/or DTCs, Corrosion Present in A43 or A9
Connector
Repair Procedure (continued)
6. Replace the components listed in the table below.
COMPONENT
NON-HYBRID VEHICLE
HYBRID VEHICLE
ECM
Inverter Water Pump
Engine Room Main Wire Harness
Engine Room Main Wire Harness
Windshield
Windshield
A. 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.
Reference the figure below to identify Toyota genuine parts.
Figure 4.
3
4
1
c
2
1
Toyota Part Num ber and Markings
2
Toyota Genuine De icer Harness
3
Underside of Deicer Harness Connection (Underside of Windshield)
4
Toyota and Pilkington Markings (Lower Corner of Driver Side Windshield)
(1) Remove the windshield.
Refer to TIS, applicable model and model year Repair Manual:

2014 / 2015 / 2016 / 2017 / 2018 Highlander:
Vehicle Exterior – Window/Glass – “Window / Glass: Windshield Glass: Removal”

2014 / 2015 / 2016 / 2017 / 2018 Highlander HV:
Vehicle Exterior – Window/Glass – “Window / Glass: Windshield Glass: Removal”
© 2019 Toyota Motor Sales, USA
T-SB-0072-19
June 24, 2019
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Various Drivability Concerns, and/or DTCs, Corrosion Present in A43 or A9
Connector
Repair Procedure (continued)
(2) Install the NEW windshield.
Refer to TIS, applicable model and model year Repair Manual:

2014 / 2015 / 2016 / 2017 / 2018 Highlander:
Vehicle Exterior – Window/Glass – “Window / Glass: Windshield Glass: Installation”

2014 / 2015 / 2016 / 2017 / 2018 Highlander HV:
Vehicle Exterior – Window/Glass – “Window / Glass: Windshield Glass: Installation”
B. ECM Replacement (2GR-FKS)
(1) Remove the ECM.
Refer to TIS, applicable model and model year Repair Manual:

2014 / 2015 / 2016 / 2017 / 2018 Highlander:
Engine/Hybrid System – 2GR-FKS (Engine Control) – “2GR-FKS (Engine Control):
ECM: Removal”
(2) Install the NEW ECM.
Refer to TIS, applicable model and model year Repair Manual:

2014 / 2015 / 2016 / 2017 / 2018 Highlander:
Engine/Hybrid System – 2GR-FKS (Engine Control) – “2GR-FKS (Engine Control):
ECM: Installation”
C. ECM Replacement (1AR-FE)
(1) Remove the ECM.
Refer to TIS, applicable model and model year Repair Manual:

2014 – 2018 Highlander:
Engine/Hybrid System – 1AR-FE (Engine Control) – “1AR-FE (Engine Control):
ECM: Removal”
(2) Install the NEW ECM.
Refer to TIS, applicable model and model year Repair Manual:

2014 / 2015 / 2016 / 2017 / 2018 Highlander:
Engine/Hybrid System – 1AR-FE (Engine Control) – “1AR-FE (Engine Control):
ECM: Installation”
© 2019 Toyota Motor Sales, USA
T-SB-0072-19
June 24, 2019
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Various Drivability Concerns, and/or DTCs, Corrosion Present in A43 or A9
Connector
Repair Procedure (continued)
D. Engine Room Main Wire Harness Replacement
(1) Unplug the harness from each connector on the vehicle. Make note of the
harness routing.
(2) Route and plug in the NEW harness, ensuring the connectors are fully installed into
the mating connector.
E. Inverter Water Pump Replacement
NOTE
This step ONLY applies to Highlander Hybrid vehicles.
(1) Remove the inverter water pump.
Refer to TIS, applicable model and model year Repair Manual:

2014 / 2015 / 2016 / 2017 / 2018 Highlander HV:
Engine/Hybrid System – Hybrid/Battery Control – “Hybrid/Battery Control: Water
Pump With Motor: Removal”
(2) Install the NEW inverter water pump.
Refer to TIS, applicable model and model year Repair Manual:

2014 / 2015 / 2016 / 2017 / 2018 Highlander HV:
Engine/Hybrid System – Hybrid/Battery Control – “Hybrid/Battery Control: Water
Pump With Motor: Installation”
7. Test-drive the vehicle to confirm the repair and normal operation.
© 2019 Toyota Motor Sales, USA