Lexus LS460 2008 Owner's Manual page 651

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The starter motor does not turn over, 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 battery terminals may be disconnected.
● The battery may be discharged. (P. 660)
● There may be a malfunction in the steering lock system.
Contact your Lexus dealer 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:
Set the parking brake.
STEP 1
Put the shift lever in "P".
STEP 2
Set the "ENGINE START STOP" switch to ACCESSORY mode.
STEP 3
Press and hold the "ENGINE START STOP" switch about 15 sec-
STEP 4
onds 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 your Lexus dealer.
5-2. Steps to take in an emergency
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