Section 601 (Lighting System - Diagnosis): Pre-Check
WARNING: This page is about a different car, the 2002 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.
- DATA LIST
Combination Switch:
PRE-CHECK DATA LIST COMBINATION SWITCHDescription Tester display Check condition Light control switch TAIL TAIL LIGHT SW ON - OFF Light control switch HEAD HEAD LIGHT SW ON - OFF Light control switch AUTO LIGHT AUTO SW ON - OFF Front fog light switch F FOG LIGHT SW ON - OFF Light control switch Flash PASSING SW ON - OFF Light control switch HI DIMMER HI SW ON - OFF Turn signal switch Left TURN LEFT SW ON - OFF Turn signal switch Right TURN RIGHT SW ON - OFF IG switch signal IG SW SIG ON - OFF Driver Side J/B ECU:
PRE-CHECK DATA LIST DRIVER SIDE J/B ECUDescription Tester display Check condition Stop light switch STOP LIGHT SW ON - OFF ACC switch ACC SW ON - OFF IG switch IG SW ON - OFF Passenger Side J/B ECU:
PRE-CHECK DATA LIST PASSENGER SIDE J/B ECUDescription Tester display Check condition Headlight leveling warning output signal H-LVL WAN SIG ON - OFF ACC switch ACC SW ON - OFF MPX-IG switch MPX-IG SW ON - OFF Luggage Room J/B ECU:
PRE-CHECK DATA LIST LUGGAGE ROOM J/B ECUDescription Tester display Check condition Taillight TAIL LGT Tr. OK - BREAK Stop light STOP LIGHT Tr. OK - BREAK High mounted stop light H-M STOP LGT Tr. OK - BREAK Back-up light BACK-UP LGT Tr. OK - BREAK Luggage courtesy switch LUGG COURTSY SW ON - OFF IG switch IG SW ON - OFF Driver Door ECU:
PRE-CHECK DATA LIST DRIVER DOOR ECUDescription Tester display Check condition Courtesy switch COURTESY SW ON - OFF Passenger Door ECU:
PRE-CHECK DATA LIST PASSENGER DOOR ECUDescription Tester display Check condition Courtesy switch COURTESY SW ON - OFF - ACTIVE TEST
Front Lamp ECU (Front Controller):
ACTIVE TEST DATA LIST FRONT LAMP ECU (FRONT CONTROLLER)Description Tester display Check condition Headlight Hi HEAD LIGHT (HI) ON - OFF Front fog light F FOG LIGHT RLY ON - OFF Daytime running light DRL OPERT ON - OFF Front clearance light CLEARANCE LIGHT ON - OFF Driver Side J/B ECU:
ACTIVE TEST DATA LIST DRIVER SIDE J/B ECUDescription (Symbols) Tester display Check condition Headlight HEAD LIGHT ON - OFF Driver side buckle illumination D BUCKLE LIGHT ON - OFF Turn signal Left TRN SIG LGT L ON - OFF ACTIVE TEST DATA LIST DRIVER SIDE J/B ECUDescription (Symbols) Tester display Check condition Turn signal Right TRN SIG LGT R ON - OFF Illumination signal output ILLUMI OUTPUT ON - OFF Passenger Side J/B ECU:
ACTIVE TEST DATA LIST PASSENGER SIDE J/B ECUDescription (Symbols) Tester display Check condition Front room light (Front step light) F ROOM LIGHT ON - OFF Passenger side buckle illumination BUCKLE LIGHT ON - OFF Luggage Room J/B ECU:
ACTIVE TEST DATA LIST LUGGAGE ROOM J/B ECUDescription Tester display Check condition Taillight TAIL LIGHT ON - OFF Stop light STOP LIGHT ON - OFF License light LICENSE LIGHT ON - OFF Hi-mounted stop light H-M STOP LIGHT ON - OFF Back-up light BACK-UP LIGHT ON - OFF Luggage room light LUGG LIGHT ON - OFF - FAIL-SAFE FUNCTION
- Headlight Leveling Control ECU
HINT:
The Headlight Leveling Control ECU performs the fail-safe when detecting following troubles. At this it lights the warning Indicator light on the combination meter.
HEADLIGHT LEVELING CONTROL ECUTrouble Area System Headlight Leveling Actuator - Open circuit
- Short circuit
Vehicle Speed Sensor One vehicle speed signal is 0 km/h and the other is 10 km/h (8 MPH) or more. Generator - Open circuit
- Short circuit
Height Control Sensor Signal lever error Pitch Angle Calculation Error Signal lever error Recovery condition (The warning light goes off.)
- Ignition switch OFF
- Ignition switch OFF or signal lever error cancellation
- Light Control ECULIGHT CONTROL ECU
When Input Error Is Inspected. When input voltage is not within the range of operation voltage (9 to 16 V), lighting of the headlight stops. As soon as the voltage comes within the range, it lights up again.
However if the input voltage becomes low after lighting up, sufficient voltage is maintained until light of bulb completely goes off.When Output Error Is Inspected (Open Or Short).
When Light Flushing Is Inspected.When an error occurs in the output voltage (open or short) or flushing symptom occurs on the bulb, lighting of the headlight stops, the condition is maintained until power is turned ON again (headlight dimmer switch OFF --> ON).
In this case, it can not be judged whether lighting malfunction is caused by an output error or other reasons (fuse blown out, etc.). Check that there is no error in fuse and wiring (including power source) and replace the bulb in the first place, when the error still appears, replace the light control ECU.
- Headlight Leveling Control ECU
- USING LEXUS HAND-HELD TESTER
- Hook up the LEXUS hand-held tester to the DLC3.
- Monitor the ECU data by following the prompts on the tester screen.
HINT:
LEXUS hand-held tester has a "Snapshot" function which records the monitored data.
Please refer to the LEXUS hand-held tester operator's manual for further details.
- DTC CLEAR
- The DTCs and freeze frame data will be erased by either action.
Opening the OBD II scan tool (complying with SAE J1978) or LEXUS hand-held tester to erase the codes. See the OBD II scan tool's instruction book for operating instructions.
- The DTCs and freeze frame data will be erased by either action.