2022 NX 350h:
Engine/Hybrid System – Hybrid/Battery Control System – “Hybrid / Battery Control: HV
Battery: Charging”



2019 – 2022 UX 250h:
Engine/Hybrid System – Hybrid/Battery Control System – “Hybrid / Battery Control: HV
Battery: Charging”

4. Connect the GRX-5100 for a rescue charge.
NOTE
 ALWAYS use Techstream to troubleshoot the hybrid system before attempting an
HV battery charge.
 Charging time while using the GRX-5100 is 10 minutes per charge cycle when the battery
temperature is above 77°F (25°C).
 If the battery temperature is below 32°F (0°C), then three 10-minute charge cycles may be
required for putting the engine in a condition where it can be started (the system can enter the
READY ON state).
 The GRX-5100 will automatically stop 10 minutes AFTER charging starts.

A. Remove necessary SST cables located in the HEV tool box drawers.
NOTE
The required cables are listed in the Required Tools & Equipment table shown on page 2.

B. Connect the power input (Cable S) to the GRX-5100 and connect the cable into a
grounded AC 100 to 240V receptacle.
NOTICE
ALWAYS confirm the AC 100 to 240V receptacle has a properly functioning ground by
using the AC Circuit Checker provided in the HEV Workstation. The ground is
designed to reduce the chance of electric shock if a malfunction occurs. Do NOT use
the charger if ANY of the pins on the plug (Cable S) have been damaged or removed.

© 2022 Lexus, a division of Toyota Motor Sales, USA

L-SB-0040-20

Rev1

November 2, 2020

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High Voltage (HV) Battery Rescue Charge at Battery (HEV Workstation/GRX5100)
Rescue Charge at Battery (continued)

C. Turn the GRX-5100 ON.
D. Select Rescue Charge by using the arrow
key, then press Select.

Figure 1.

E. Confirm you are wearing the appropriate PPE for high voltage service.
CAUTION
ALWAYS wear the appropriate PPE when working with high voltage: Insulated gloves,
insulated apron, and arc protective helmet with face shield.

F. Press Yes.

Figure 2.

© 2022 Lexus, a division of Toyota Motor Sales, USA

L-SB-0040-20

Rev1

November 2, 2020

Page 8 of 16

High Voltage (HV) Battery Rescue Charge at Battery (HEV Workstation/GRX5100)
Rescue Charge at Battery (continued)
Figure 3.

G. Press Next.
NOTE
Refer to the applicable model and model
year Repair Manual for vehicle specific
instructions for disassembly and
connector locations.

H. Ensure the service plug grip is removed,
then press Yes.

Figure 4.

NOTE
Refer to the applicable model and model
year Repair Manual at TIS – Engine Hybrid
System – Hybrid/Battery Control System –
HV Battery Charging for the appropriate
wait time AFTER the high voltage service
plug grip is pulled.

I.

Connect the High Voltage Cable V to the fuse box.

J. Connect the Banana Jack Extension Cable X to the fuse box.
K. Connect High Voltage Cable V to the GRX-5100.
L. Connect the Low Voltage Cable R to the GRX-5100.
CAUTION
 ALWAYS wear insulated gloves and the appropriate PPE provided in the HEV
Workstation when working with high voltage.
 ALWAYS use insulated tools provided in the HEV Workstation when working with
high voltage.

© 2022 Lexus, a division of Toyota Motor Sales, USA

L-SB-0040-20

Rev1

November 2, 2020

Page 9 of 16

High Voltage (HV) Battery Rescue Charge at Battery (HEV Workstation/GRX5100)
Rescue Charge at Battery (continued)

M. Connect the green high voltage bonding
cable to a suitable chassis ground.

Figure 5.

N. Press Next.

Figure 6.

© 2022 Lexus, a division of Toyota Motor Sales, USA

L-SB-0040-20

Rev1

November 2, 2020

Page 10 of 16

High Voltage (HV) Battery Rescue Charge at Battery (HEV Workstation/GRX5100)
Rescue Charge at Battery (continued)

O. Connect the low voltage cable as shown in
Repair Manual.

Figure 7.

NOTE
The Repair Manual may call this cable
“EV bonding cable (green cable).”

P. Press Next.

Figure 8.

© 2022 Lexus, a division of Toyota Motor Sales, USA

L-SB-0040-20

Rev1

November 2, 2020

Page 11 of 16

High Voltage (HV) Battery Rescue Charge at Battery (HEV Workstation/GRX5100)
Rescue Charge at Battery (continued)

Q. Plug Cable A619A and Cable A619B into
the HV battery location shown in the
Repair Manual.

Figure 9.

NOTE
Install the HV cables above in the same
location on the junction block as the “High
voltage cable” listed in the Repair Manual.

R. Connect the red (+) Banana Jack Extension
cable into A619A, and the black (-) banana
jack extension cable into A619B.

Figure 10.

S. Inspect the connection according to the applicable model and model year Repair Manual at
TIS – Engine/Hybrid System – Hybrid/Battery Control System – HV Battery Charging for
proper installation.
NOTE
The Repair Manual will show Lexus THS charger usage; please use the GRX-5100 instead.

© 2022 Lexus, a division of Toyota Motor Sales, USA

L-SB-0040-20

Rev1

November 2, 2020

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High Voltage (HV) Battery Rescue Charge at Battery (HEV Workstation/GRX5100)
Rescue Charge at Battery (continued)

T. Press Next.

Figure 11.

U. Wait for the internal test to complete.

Figure 12.

V. Install the service plug grip.

Figure 13.

W. Press Next.
NOTICE
Make sure the service plug grip’s
interlock is fully engaged.

© 2022 Lexus, a division of Toyota Motor Sales, USA

L-SB-0040-20

Rev1

November 2, 2020

Page 13 of 16

High Voltage (HV) Battery Rescue Charge at Battery (HEV Workstation/GRX5100)
Rescue Charge at Battery (continued)

X. Connect the negative (–) terminal of the auxiliary battery.
NOTE
Using the power supply mode, connect the DCA-8000 to the auxiliary battery.

Y. Wait for the high voltage bonding test
to complete.

Figure 14.

5. HV battery rescue charging.
A. Turn the vehicle power switch to the IG-ON position.
B. Connect Techstream to DLC3.
C. Refer to the following menus: Powertrain – Hybrid Control – Active Test – Battery Charge.
HINT
During the battery charge active test, check the System Main Relay Status – SMRB and the
System Main Relay Status – SMRG on the data list.

© 2022 Lexus, a division of Toyota Motor Sales, USA

L-SB-0040-20

Rev1

November 2, 2020

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High Voltage (HV) Battery Rescue Charge at Battery (HEV Workstation/GRX5100)
Rescue Charge at Battery (continued)

D. Open the battery charge active test and
click the ON button on Techstream. Then
press Next on the GRX-5100 to start HV
battery charging within 30 seconds.

Figure 15.

NOTE








AFTER the battery charge active test has been turned ON, press Next on the GRX-5100
within 30 seconds. If Next is NOT pressed within 30 seconds, the SMR will open, and the
GRX-5100 will NOT be able to charge the HV battery.
If the shielding of the frame wire is NOT securely connected to body ground, the GRX-5100
will NOT operate.
The GRX-5100 charging condition status will be displayed on the screen of the GRX-5100
while charging the HV battery.
During the HV battery charge cycle, the voltage and charge current will be recorded on the
flash drive.
The GRX-5100 will automatically stop 10 minutes AFTER charging starts. SMRs will
automatically open as soon as the GRX-5100 stops charging.
If the data list values are NOT as specified in the table below, restart Techstream and cycle
the vehicle’s power switch to the IG-ON/OFF positions, and then perform the HV battery
rescue charging procedure again.

STEP

ACTIVE TEST
BATTERY
CHARGE

GRX-5100 START
SWITCH

DATA LIST SYSTEM MAIN
RELAY STATUS – SMRB

DATA LIST SYSTEM MAIN
RELAY STATUS – SMRG

1

OFF

OFF

OFF

OFF

2

OFF → ON

OFF

OFF → ON

OFF → ON

3

ON

OFF → ON

ON

ON

© 2022 Lexus, a division of Toyota Motor Sales, USA

L-SB-0040-20

Rev1

November 2, 2020

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High Voltage (HV) Battery Rescue Charge at Battery (HEV Workstation/GRX5100)
Rescue Charge at Battery (continued)

E. Wait for the HV battery rescue charge
to start.

Figure 16.

F. Repeat the charge cycle up to three times
if required.

Figure 17.

NOTE
 Charging time while using the GRX-5100 is 10 minutes per charge cycle when the battery
temperature is above 77°F (25°C).
 If the battery temperature is below 32°F (0°C), then three 10-minute charge cycles may be
required for putting the engine in a condition where it can be started (the system can enter the
READY ON state).
 The GRX-5100 will automatically stop 10 minutes AFTER charging starts.
 There is VERY LITTLE chance of overcharging the HV battery during the second or third
charging cycle. The SOC will not likely increase beyond the upper limit because it was low
enough to prevent the engine from starting. Even if the SOC were to increase enough to
exceed the limit, the hybrid vehicle control ECU will stop the active test to
prevent overcharging.
 Cranking the engine once causes the SOC to drop approximately 1%.
 Charging the HV battery once (10 minutes) using the GRX-5100 restores the SOC
approximately 2%.

© 2022 Lexus, a division of Toyota Motor Sales, USA

L-SB-0040-20

Rev1

November 2, 2020

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High Voltage (HV) Battery Rescue Charge at Battery (HEV Workstation/GRX5100)
Rescue Charge at Battery (continued)

6. Reassemble the vehicle.
CAUTION
 ALWAYS wear insulated gloves and the appropriate PPE provided in the HEV
Workstation when working with high voltage.
 ALWAYS use insulated tools provided in the HEV Workstation when working with
high voltage.

A. Turn the GRX-5100 power switch OFF.
B. Turn the vehicle power switch OFF.
C. Disconnect the 12V auxiliary battery.
D. Remove the service plug grip.
E. Remove the GRX-5100 cables.
F. Reassemble the vehicle following the applicable model and model year Repair Manual at
TIS – Engine Hybrid System – Hybrid/Battery Control System – HV Battery Charging.
G. Install the service plug grip.
H. Connect the 12V auxiliary battery.
I.

Check for ANY DTCs.

J. Confirm whether the engine cranks.
Does the engine crank?


YES — Continue to substep K.



NO — Repeat steps 3 – 6.

K. Confirm whether the engine starts.
Does the engine start?


YES — Continue to step 7.



NO — Continue diagnosis using the applicable Repair Manual.

7. Allow the vehicle to idle in park “P” until the engine stops. Once the engine stops, self-charge
has been completed.

© 2022 Lexus, a division of Toyota Motor Sales, USA