Lexus IS250 · Service Manual BODY ELECTRICAL

FAIL-SAFE CHART

System information

FUEL SIGNAL (FUEL INJECTION SIGNAL):
Condition	Response	Recovery
While the engine switch on (IG), fuel injection signal is interrupted for 60 seconds.	Fuel gauge calibration is performed using average fuel consumption data.	Engine switch off and then on (IG) and normal data is received.

ENGINE COOLANT TEMPERATURE GAUGE:
Condition	Response	Recovery
Engine coolant temperature data is interrupted for 5 seconds.	The gauge needle indicates less than "C".	Engine coolant temperature data is received.

SHIFT INDICATOR (*1):
Condition	Response	Recovery
"P" to "D" data is interrupted for 3 seconds.	All indicator lights go off.	Normal data is received.
A/T range data is interrupted for 3 seconds, or more than 2 items are received simultaneously.	The A/T range indicator light and backlight LED goes off.	Normal data is received.

ABS & BRAKE:
Condition	Response	Recovery
ABS & brake data is interrupted for 1 second.	The warning light comes on.	Normal data is received.

DOOR:
Condition	Response	Recovery
Regular data is interrupted for 10 seconds.	The data received most recently remains indicated.	Normal data is received.

DRIVER SIDE SEAT BELT:
Condition	Response	Recovery
Driver side seat belt inner belt assembly data is interrupted for 10 seconds.	The data received most recently remains indicated.	Normal data is received.

FRONT PASSENGER SIDE SEAT BELT:
Condition	Response	Recovery
Front passenger side seat belt inner belt assembly data or occupant detection data is interrupted for 10 seconds.	The data received most recently remains indicated.	Normal data is received.

POWER STEERING (*2):
Condition	Response	Recovery
EPS data is interrupted for 1 second.	The indicator light comes on.	Normal data is received.

TAIL:
Condition	Response	Recovery
Regular data is interrupted for 10 seconds.	The data received most recently remains indicated.	Normal data is received.

BEAM:
Condition	Response	Recovery
Regular data is interrupted for 10 seconds.	The indicator light goes off.	Normal data is received.

AIRBAG:
Condition	Response	Recovery
Airbag data is interrupted for 10 seconds or there is a malfunction in the combination meter (meter CPU).	The warning light comes on.	Normal data is received.

METER ILLUMINATION:
Condition	Response	Recovery
Illumination data is interrupted for 10 seconds or abnormal data is received.	The display remains in daytime mode.	Normal data is received.

MULTI-INFORMATION DISPLAY:
Condition	Response	Recovery
Cruise information data is interrupted for 60 seconds.	The display becomes blank (only measurement units are displayed).	Normal data is received.

*1: for Automatic Transmission
*2: with Power Tilt and Power Telescopic