–

X

X

X

2016 –
2022

GYL15

–

–

X

X

X

GYL25

–

–

X

X

X

2007 –
2011

GWS191

–

X

–

–

X

2013 –
2018

GWL10

–

X

–

–

X

2008 –
2016

UVF46

–

X

–

–

X

RX 450h

GS 450h

LS 600hL

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

L-SB-0088-15

Rev2

December 17, 2015

Page 6 of 15

High Voltage (HV) Battery Rescue Charge (HEV Workstation/GRX-5100)
Rescue Charge Ni-MH (continued)
C. 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.

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

Figure 1.

F. Confirm you are wearing the
appropriate PPE for high
voltage service.

Figure 2.

G. Press Yes.
CAUTION
ALWAYS wear the appropriate PPE
when working with high voltage:
Insulated gloves, insulated apron,
and protective helmet with
face shield.

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

L-SB-0088-15

Rev2

December 17, 2015

Page 7 of 15

High Voltage (HV) Battery Rescue Charge (HEV Workstation/GRX-5100)
Rescue Charge Ni-MH (continued)
H. Press Next.

Figure 3.

NOTE
Please refer to the Repair Manual
for vehicle specific instructions
for disassembly and
connector locations.

I.

Remove the service plug grip.

Figure 4.

J. Press Yes.

K. Remove the inverter terminal cover.

Figure 5.

L. Check terminal voltage.
NOTE
Standard voltage: 0 volts.

M. Disconnect the frame wire.

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

L-SB-0088-15

Rev2

December 17, 2015

Page 8 of 15

High Voltage (HV) Battery Rescue Charge (HEV Workstation/GRX-5100)
Rescue Charge Ni-MH (continued)
N. Measure the resistance according
to the value(s) in the table below.

Figure 6.

NOTE
If the shielding of the frame wire is
NOT securely connected to body
ground, the GRX-5100 will
NOT operate.

Table 2.

TESTER CONNECTION

CONDITION

SPECIFIED CONDITION

Frame Wire Connector
Housing – Body Ground

Always

Below 1 Ω

O. If the results are NOT as specified, 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.

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

L-SB-0088-15

Rev2

December 17, 2015

Page 9 of 15

High Voltage (HV) Battery Rescue Charge (HEV Workstation/GRX-5100)
Rescue Charge Ni-MH (continued)
P. Connect the corresponding high voltage cable to the fuse box.
Q. Connect High Voltage Cable V to the fuse box.
R. Connect High Voltage Cable V to the GRX-5100.
S. Connect the corresponding Low Voltage cable to the GRX-5100.
T. Install the inverter terminal cover to the inverter assembly.
NOTICE
 Do NOT allow ANY foreign material or water to enter the inverter assembly.
 Make sure ALL connectors are connected securely.

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.

U. Connect the green HV bonding
cable to a suitable chassis ground
V. Press Next.

Figure 7.

W. Connect the low voltage cable to
inverter terminal cover.

Figure 8.

X. Press Next.
NOTE
NOT ALL vehicles require a separate
low voltage cable circuit.

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

L-SB-0088-15

Rev2

December 17, 2015

Page 10 of 15

High Voltage (HV) Battery Rescue Charge (HEV Workstation/GRX-5100)
Rescue Charge Ni-MH (continued)
Y. Connect the HV cable to the
vehicle’s frame wire.
NOTE
HV cable connections will vary by
vehicle (refer to substep O for vehicle
specific cable application)

Z. Press Next.

Figure 9.

NOTE
 Certain HV cables require a
grounding bolt to complete the HV
bonding test.
 HV cables requiring a grounding
bolt have been labeled using a
black sticker indicating bolt
location, size, and torque.

AA. Install the interlock connector in
the inverter.

Figure 10.

NOTE
The battery charge active test will fail
and a DTC will set if the interlock
connector is NOT installed.

BB. Overall view of connectors and their connections for the GRX-5100 are shown in
Figure 11 for HV battery rescue charge.
HINT
Please refer to the Repair Manual for vehicle specific instructions for disassembly and
connector locations.

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

L-SB-0088-15

Rev2

December 17, 2015

Page 11 of 15

High Voltage (HV) Battery Rescue Charge (HEV Workstation/GRX-5100)
Rescue Charge Ni-MH (continued)
Figure 11. Example of a Connection for a 2011 – 2015 CT 200h

NOTE
Refer to HV Battery – Charging in the Repair Manual for applicable model.

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

L-SB-0088-15

Rev2

December 17, 2015

Page 12 of 15

High Voltage (HV) Battery Rescue Charge (HEV Workstation/GRX-5100)
Rescue Charge Ni-MH (continued)
CC. Wait for the internal test
to complete.

Figure 12.

DD. Install the service plug grip.

Figure 13.

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

FF. Connect the negative (-) terminal of
the auxiliary battery.
NOTE
Using the power supply mode,
connect the battery diagnostic tool to
the auxiliary battery.

GG. Please wait for the HV bonding test
to complete.

Figure 14.

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

L-SB-0088-15

Rev2

December 17, 2015

Page 13 of 15

High Voltage (HV) Battery Rescue Charge (HEV Workstation/GRX-5100)
Rescue Charge Ni-MH (continued)
4. HV battery rescue charging.
A. Turn the vehicle power switch (IG) ON.
B. Connect Techstream to DLC3.
C. Enter 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 System
Main Relay Status – SMRG on the data list.

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, push the NEXT button on the GRX5100 within 30 seconds. If the next button is NOT pushed within the 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
charging condition status will be displayed on the screen of the GRX-5100 while HV
battery charging.
 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 the Techstream and
cycle the vehicle’s power switch (IG) OFF/ON, and then perform the HV battery rescue
charging procedure again.
Table 3.

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-0088-15

Rev2

December 17, 2015

Page 14 of 15

High Voltage (HV) Battery Rescue Charge (HEV Workstation/GRX-5100)
Rescue Charge Ni-MH (continued)
E. Please wait for the 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); 10 minutes may be sufficient, 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 was 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-0088-15

Rev2

December 17, 2015

Page 15 of 15

High Voltage (HV) Battery Rescue Charge (HEV Workstation/GRX-5100)
Rescue Charge Ni-MH (continued)
5. 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 12V auxiliary battery.
D. Remove the service plug grip.
E. Remove the GRX-5100 cables and interlock connector.
F. Reassemble the vehicle following the Repair Manual.
G. Install the service plug grip.
H. Reconnect the 12V auxiliary battery.
I.

Check for ANY DTCs.

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

YES — Continue to substep K.



NO — Repeat steps 3 – 5.

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

YES — Continue to step 6.



NO — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
HINT
Please refer to the Repair Manual for vehicle specific instruction for reassembly and
connector locations.

6. 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