DESCRIPTION
This DTC is stored if the heat generated by the transmission coupling assembly exceeds a certain amount or the estimated oil temperature of the transfer exceeds a certain amount while driving.
DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
---|---|---|---|
C1299 | Cancellation of 4WD Control | When one of the following conditions is met:
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CAUTION / NOTICE / HINT
NOTICE:
When the 4WD ECU assembly is replaced with a known good one from another vehicle, it is necessary to perform calibration.
Click here
HINT:
Check the condition of each related circuit connector before troubleshooting.
Click here
PROCEDURE
1. | CHECK VEHICLE USAGE |
(a) Check that there has been no unintended vehicle usage.
OK:
There is no evidence of rough use (the vehicle has not been driven on damaged or snowy roads, etc. for long periods of time).
NG | ![]() | CHECK FOR INTERMITTENT PROBLEMS |
|
2. | CHECK FOR DTC |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Check if vehicle stability control system DTCs are output.
Chassis > Brake/EPB > Trouble Codes(e) Read the DTCs using the Techstream.
Result | Proceed to |
---|---|
Only DTC C1299 is output | A |
DTC C1299 and other DTCs (vehicle stability control system DTC) | B |
B | ![]() | REPAIR CIRCUIT INDICATED BY OUTPUT CODE (VEHICLE STABILITY CONTROL SYSTEM) |
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3. | CHECK RELATED PART |
(a) Check the condition, size and tire pressure of the front and rear tires.
(b) Inspect the suspension, ball joints, etc. for rattles.
(c) Inspect the drive shaft and propeller shaft rotation condition.
NG | ![]() | REPAIR OR REPLACE MALFUNCTIONING PARTS |
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4. | RECONFIRM DTC |
(a) Clear the DTCs.
Click here
(b) Start the engine.
(c) Drive the vehicle at a speed of 20 km/h (12 mph) or more and check that the same DTC is output.
Click here
Result | Proceed to |
---|---|
DTC is output | A |
DTC is not output | B |
B | ![]() | CHECK FOR INTERMITTENT PROBLEMS |
|
5. | REPLACE 4WD ECU ASSEMBLY |
(a) Replace the 4WD ECU assembly.
Click here
|
6. | RECHECK DTC |
(a) Clear the DTCs.
Click here
(b) Start the engine.
(c) Drive the vehicle at a speed of 20 km/h (12 mph) or more and check that the same DTC is output.
Click here
Result | Proceed to |
---|---|
DTC is output | A |
DTC is not output | B |
A | ![]() | REPLACE ELECTRO MAGNETIC CONTROL COUPLING SUB-ASSEMBLY |
B | ![]() | END |
Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual > Can Communication System: Open in One Side of Bus 5 Branch Line
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Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual > Lighting System (w/ Automatic Headlight Beam Level Control System): Customize Parameters
CUSTOMIZE PARAMETERS CUSTOMIZE LIGHTING SYSTEM (EXT) NOTICE:
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