DESCRIPTION
If a malfunction in the power source circuit occurs, or a communication malfunction with the skid control ECU (brake actuator assembly) or speed sensor occurs, the 4WD ECU assembly prohibits operation.
DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
---|---|---|---|
C1241 | Low or High Power Supply Voltage |
|
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Click here
HINT:
Check the condition of each related circuit connector before troubleshooting.
Click here
PROCEDURE
1. | CHECK FOR DTC (CAN COMMUNICATION SYSTEM AND VEHICLE STABILITY CONTROL SYSTEM) |
(a) Check if CAN communication DTCs are output.
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(b) Start the engine.
(c) Drive the vehicle, accelerate to a speed of 3 km/h (2 mph) or more for 60 seconds or more, and check if any DTCs related to a speed sensor are output.
Chassis > Brake/EPB > Trouble Codes Result | Proceed to |
---|---|
CAN communication system DTCs and vehicle stability control system DTCs are not output | A |
CAN communication DTCs are output | B |
Vehicle stability control system DTCs are output | C |
HINT:
If CAN communication DTCs are output, perform troubleshooting for the CAN communication system first.
B | GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) |
C | REPAIR CIRCUIT INDICATED BY OUTPUT CODE (VEHICLE STABILITY CONTROL SYSTEM) |
|
2. | INSPECT BATTERY |
(a) Check the battery voltage.
Standard Voltage:
11 to 14 V
NG | CHECK CHARGING SYSTEM |
|
3. | CHECK HARNESS AND CONNECTOR (IG1 TERMINAL) |
(a) Disconnect the R10 4WD ECU assembly connector.
(b) Turn the engine switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection | Switch Condition | Specified Condition |
---|---|---|
R10-3 (IG1) - Body ground | Engine switch on (IG) | 11 to 14 V |
NG | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
4. | CHECK HARNESS AND CONNECTOR (GND TERMINAL) |
(a) Turn the engine switch off.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection | Condition | Specified Condition |
---|---|---|
R10-4 (GND) - Body ground | Always | Below 1 Ω |
NG | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
5. | RECONFIRM DTC |
(a) Connect the R10 4WD ECU assembly connector.
(b) Clear the DTCs.
Click here
Chassis > Four Wheel Drive > Clear DTCs(c) Start the engine.
(d) Drive the vehicle, accelerate to a speed of 3 km/h (2 mph) or more for 60 seconds or more, and check if the same DTC is output.
Click here
Chassis > Four Wheel Drive > Trouble Codes Result | Proceed to |
---|---|
DTCs are output | A |
DTCs are not output | B |
A | REPLACE 4WD ECU ASSEMBLY |
B | CHECK FOR INTERMITTENT PROBLEMS |
Lexus RX (RX 350L, RX450h) 2016-2024 Owners Manual > Before driving: Trailer towing (vehicles
without towing
package)
Lexus does not recommend towing a trailer with your vehicle. Lexus also
does
not recommend the installation of a tow hitch or the use of a tow hitch carrier
for a wheelchair, scooter, bicycle, etc. Your vehicle is not designed for
trailer
towing or for the use of tow hitch mounted carriers.
...
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DESCRIPTION Based on the engine switch signal, each fold seat control ECU determines the driving condition of the vehicle and enables or disables the fold and return functions. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE:
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