Lexus LS 500h 2019 Owner's Manual page 540

538 7-2. Steps to take in an emergency
perature of the hybrid battery (trac-
tion battery) is extremely low
(approximately below -30°C
[-22°F]). (P.223)
*
: It may not be possible to shift the shift
position from P.
The interior lights and head-
lights are dim, or the horn does
not sound or sounds at a low vol-
ume.
One of the following may be the cause
of the problem:
 The 12-volt battery may be dis-
charged. (P.542)
 The 12-volt battery terminal con-
nections may be loose or corroded.
(P.485)
The interior lights and head-
lights do not turn on, or the horn
does not sound.
One of the following may be the cause
of the problem:
 One or both of the 12-volt battery
terminals may be disconnected.
(P.485)
 The 12-volt battery may be dis-
charged. (P.542)
Contact your Lexus dealer if the problem
cannot be repaired, or if repair procedures
are unknown.
LS500h_OM_General_OM50J66E
Starting the hybrid system in an
emergency
When the hybrid system does not start,
the following steps can be used as an
interim measure to start the hybrid sys-
tem if the power switch is functioning
normally.
Do not use this starting procedure
except in cases of emergency.
Press the parking brake switch to
1
check that the parking brake is set.
(P.237)
Parking brake indicator will come on.
2 Turn the power switch to ACCES-
SORY mode.
3 Press and hold the power switch for
about 15 seconds while depressing
the brake pedal firmly.
Even if the hybrid system can be
started using the above steps, the sys-
tem may be malfunctioning. Have the
vehicle inspected by your Lexus dealer.