Lexus LS460 2011 Owner's Manual page 762

5-2. Steps to take in an emergency

The starter motor does not turn over, the interior lights and
headlights 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 battery terminals may be disconnected.
 The battery may be discharged. (P. 737)
 There may be a malfunction in the steering lock system.
Contact any authorized Lexus dealer or repairer, or another duly
qualified and equipped professional, if the problem cannot be
repaired, or if repair procedures are unknown.
Emergency start function
When the engine does not start, the following steps can be used as
an interim measure to start the engine if the "ENGINE START
STOP" switch is functioning normally:
STEP 1
Set the parking brake.
STEP 2
Shift the shift lever to "P".
STEP 3
Set the "ENGINE START STOP" switch to ACCESSORY
mode.
STEP 4
Press and hold the "ENGINE START STOP" switch about
15 seconds while depressing the brake pedal firmly.
Even if the engine can be started using the above steps, the system
may be malfunctioning. Have the vehicle checked by any autho-
rized Lexus dealer or repairer, or another duly qualified and
equipped professional.
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