Question about 2006 Lexus Is 250

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I have a Lexus IS 250 - 2006 model. The vehicle won't start when you depress the engine start button. Had a diagnosis done and found out that the ECU communications failed. After another thorough diagnostis and tracing found that the Engine Control Unit is draini9ng all the battery power. The unit gets hot like you would switch on a hotplate on your stove. I was told to get a new Cluster, Body control module, immobiliser Box, ECU and keys to match. This would cost me an arm and a leg. Is this diagnosis correct? Is there any way that i could replace the ECU only and have it recoded? What options do i have? Which is the easy and cost effective way out? My car is still on HP! I am desperate for help!!!!!!

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  • Lexus Master
  • 53,745 Answers

Replace the ECU ( ECM ) with another unit
you will need to get one from another exact same vehicle and there should not be any other problems other than the immobilizer which you can get reprogrammed or have the keys reprogrammed to the ECM
The unit getting hot and draining the battery indicates that it has failed and has to be replaced
Wreckers / junk yards that dismantle your make of vehicle will have comparable units st a reasonable price ( probably an arm but you will keep your leg)
or there are companies that can recondition your existing unit or sell you an service exchange unit for around 2/3 the price of a new genuine unit

Posted on Mar 25, 2017

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Posted on Jan 02, 2017

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SOURCE: The Lexus car remote key control model ES300

try this:

1. Start with key out of ignition, drivers door is open all others closed and
drivers door is unlocked.

2. Insert key into the ignition (DO NOT Turn) and Pull key out.
3. Perform these steps within 40 seconds.
A. Using the power lock switch on the drivers door, perform 5 lock/unlock cycles
starting with lock. Use an even pace and try to go about one cycle per second.
(1Cycle = 1 lock and 1 unlock).
B. Close, then open drivers door.

4. Perform these steps within 40 seconds.
A. Using the power lock switch on the drivers door, perform 5 lock/unlock cycles
starting with lock. Use an even pace and try to go about one cycle per second.
(1Cycle = 1 lock and 1 unlock).
B. Insert the key in the ignition cylinder.
C. Turn the ignition to ON (Do NOT Start) then back to OFF.
D. Remove the key from the ignition.

5. Press any button on remote for a minimum of 1 second.
System should now lock and unlock doors once.

6. Close and open drivers door.

7. Press any button on remote for a minimum of 1 second. System should now lock and
unlock doors. Once to confirm programming, twice to indicate programming failed.

8. Repeat steps 5, 6 and 7 for additional remotes.

Posted on Mar 23, 2009

Wolfman304
  • 720 Answers

SOURCE: I have a Lexus RX300 1999 model and have this recent problem. engine running normally but gear gets stuck in Parking mode and won't shift. had to depress the emergency button on the gear shift and

Hi there,

Some automatic vehicles rely on the brake switch (mounted on brake pedal) to be activated by depressing brake pedal. This signal then operates a relay and switch, to release the gear lever.

Firstly, I would check the brake pedal switch (are your brake lights working?).

If brake switch is confirmed OK, then inspect the relay (and related circuit components) of the gear release switch.

Posted on Mar 04, 2013

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My Lexus IS 250 - 2006 model, won't start when you depress the start button. Had a diagnostic done and found out thet the Engine Control Unit is getting very hot and draining out all the battery power. The...


Sometimes you can find a used ECU at a wrecking yard. If they have the ECU, they probably have everything you need. Not sure why you would need a new immobilizer or cluster. I would try just swapping out the ECU. The guys at the salvage yard may know more advice. Good luck. By the way, you can find parts like this at car-part.com. It will use your zip code to find the one closest to you.

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I have a Lexus RX300 1999 model and have this recent problem. engine running normally but gear gets stuck in Parking mode and won't shift. had to depress the emergency button on the gear shift and


Hi there,

Some automatic vehicles rely on the brake switch (mounted on brake pedal) to be activated by depressing brake pedal. This signal then operates a relay and switch, to release the gear lever.

Firstly, I would check the brake pedal switch (are your brake lights working?).

If brake switch is confirmed OK, then inspect the relay (and related circuit components) of the gear release switch.

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Try check the engine control unit.. It's located at passenger side under the plastic cover food step side wall.. I repair more then 30 units of this GS300 n ARISTO all with the ECU failure if check everything with the engine n sensor.. Also check if there is fuel supply coz some model build with hi-low fuelpump control module.

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1 Answer

My nissan 95 truck won't start. the battery is ok. once it wouldn't start and i put it in neutral then back to park and it started right up. where is the neutral safety switch located? I heard...


I think your reverse to park trick was a fluke,, I assume it turns over but since it is a 1995 you dont have a OBD 2 in the vehicle.
How to pull ECU error codes for 87-95 Pathfinders and Hardbody pickups:


The ECU is under your passenger's side seat. You can gain access to it by simply sliding the seat all the way forward and removing the plastic cover from the ECU. You can also remove the seat if you want, it makes access a little easier.

The VG30i ECU's have a tiny toggle switch on the side of the ECU with a small snap-in switch cover that must be utilized to select the diagnostic mode of the ECU. The 4-cylinder ECU and the VG30E ECU has a slotted switch that turns 1/4 or 1/2 turn clockwise and counterclockwise to do the same task. Some early 4-cyl HB ECU's have the switch as well. In any case it will have one or the other.

For 4-cylinder:
1. Turn the ignition switch on, but do not start the engine. All of the lights in the dash should be on.
2. Turn the 'diagnostic mode selector' screw on the ECU fully clockwise. The check engine light will go out. Wait 5 seconds, then turn the screw fully counter clockwise.
3. The check engine light will then begin to flash the trouble code. (number of long flashes is the 1st digit, number of short flashes is the 2nd digit)
4. To clear all stored codes and turn the check engine light off, turn the screw fully clockwise while it is in diagnostic mode. Wait 5 seconds, then turn the screw fully counter clockwise.
5. To keep the codes stored, simply turn the key off as the check engine
light is flashing and the ECU will keep all stored codes and the check engine light will remain on.

For V6:
1. Turn the ignition switch on, but do not start the engine. All of the lights in the dash should be on.
2. For VG30i: There is a little plastic tab you pull off of the side of the ECU(facing the door). A small toggle switch is behind it with 2 positions, "ON" and "DIAGNOSTICS". Using a small screwdriver or tool, move it to the diagnostics position. The red and green LED's on top of the ECU will blink simultaneously. One time, pause, then 2 times, three times, pause...so on for each mode, 1 through 5. Mode 3 is the most commonly used mode and will yield the ECU trouble codes you need to figure out what's going on with your engine.
For VG30E with slotted switch: Turn the 'diagnostic mode selector' screw on the ECU fully clockwise. The check engine light will go out. Wait 5 seconds, then turn the screw fully counter clockwise.
3. After it blinks both LED's 3 times move the toggle switch back to the on position. After about five seconds it will start to output out the diagnostic codes as with the 4-cylinder ECU. Note each code as it is displayed, the red LED flashing once for 10's, and the green LED flashing once for 1's. Meaning: One red flash and two green flashes means code 12.
4. To clear the ECU of any trouble codes, move the switch to the "DIAGNOSTICS" position then back to the "ON" position and turn off the key.

1986.5-1995 Nissan ECU Flash Codes(all engines)

11 Crank Angle Sensor/Camshaft Position Sensor.
12 Air Flow Meter/Mass Air Flow Sensor.
13 Engine Coolant Temperature Sensor.
14 Vehicle Speed Sensor.
21 Ignition Signal.
22 Fuel Pump.
23 Idle Switch.
24 Throttle Valve Switch.
25 Idle Speed Control Valve.
28 Cooling Fan Circuit.
31 ECM.
32 EGR Function.
33 Heated Oxygen Sensor.
34 Knock Sensor.
35 Exhaust Gas Temperature Sensor.
36 EGR Control-Back Pressure Transducer.
37 Knock Sensor.
38 Right hand bank Closed Loop (B2).
41 Intake Air Temperature Sensor.
42 Fuel Temperature Sensor.
43 Throttle Position Sensor.
44 ECCS Normal Operation.
45 Injector Leak.
47 Crankshaft Position Sensor.
51 Injector Circuit.
53 Oxygen Sensor.
54 A/T Control.
55 No Malfunction.
63 No. 6 Cylinder Misfire.
64 No. 5 Cylinder Misfire.
65 No. 4 Cylinder Misfire.
66 No. 3 Cylinder Misfire.
67 No. 2 Cylinder Misfire.
68 No. 1 Cylinder Misfire.
71 Random Misfire.
72 TWC Function right hand bank.
73 TWC Function right hand bank.
76 Fuel Injection System Function right hand bank.
77 Rear Heated Oxygen Sensor Circuit.
82 Crankshaft Position Sensor.
84 A/T Diagnosis Communication Line.
85 VTC Solenoid Valve Circuit.
86 Fuel Injection System Function right hand bank.
87 Canister Control Solenoid Valve Circuit.
91 Front Heated Oxygen Sensor Heater Circuit right hand bank.
94 TCC Solenoid Valve.
95 Crankshaft Position Sensor.
98 Engine Coolant Temperature Sensor.
101 Front Heated Oxygen Sensor Heater Circuit right hand bank.
103 Park/Neutral Position Switch Circuit.
105 EGR and EGR Canister Control Solenoid Valve Circuit.
108 Canister Purge Control Valve Circuit

ECU Diagnostic Mode Procedures
Mode I - Exhaust Oxygen Sensor Monitor
-----------------------------------------------------------------------
Use Mode I to determine if the Oxygen Sensor is functioning properly.

Warm the engine to normal temperature.
Run the engine above 2000 RPM under no load while looking at the ECU.
Make sure the GREEN LED goes on and off more than five times during ten seconds at 2000 RPM.
If the number of flashes are not more than five, replace the oxygen sensor. If the LED does not flash, check the sensor's circuit.


Mode II - Mixture Ratio Control Monitor
-----------------------------------------------------------------------
Use Mode II to determine if the air/fuel mixture is cycling correctly.

Warm the engine to normal operating temperature.
Turn the dial on the ECU fully clockwise (or if you have a switch, turn it on).
After the LED flashes twice, turn the dial fully counter clockwise (or turn the switch off).
Run the engine above 2000 RPM under no load while looking at the ECU.
If the RED LED blinks simultaneously with the GREEN LED, the air/fuel mixture is cycling properly.
If the RED LED stays off, the mixture is more than 5% rich.
If the RED LED stays on, the mixture is more than 5% lean.
If the RED LED stays on or off above 2000 RPM, complete the diagnostics before beginning repairs.


Mode III - Stored Fault Code Reporting
-----------------------------------------------------------------------
Use Mode III to retrieve all stored trouble codes in memory.
Use the above posted procedures.


Mode IV - Switch Operation Monitor
-----------------------------------------------------------------------
Use Mode IV to determine if the Throttle Position Sensor (TPS), Starter circuit and/or Vehicle Speed Sensor (VSS) are in proper working order.

Turn the ignition switch on, but do not start the engine.
Turn the dial on the ECU fully clockwise. After the LED flashes 4 times, turn the dial fully counter clockwise.
Make sure the RED LED is turned off.
Make sure the RED LED turns on when depressing the gas pedal. If not, check or replace the Throttle Position Sensor.
Make sure the RED LED turns on when turning the ignition key the START position. If not, check or replace the starter.
Drive the vehicle with the ECU unbolted and within view. Make sure the GREEN LED turns on when speed is 12 MPH or more. If not, check or replace the Vehicle Speed Sensor.


Mode V - Real Time Diagnostic Function
-----------------------------------------------------------------------

Use Mode V to determine if the Crankshaft Position Sensor (CPS), Mass Air Flow Sensor (MAFS) and/or Ignition signal are working properly.

Start engine.
Turn the dial on the ECU fully clockwise.
After the LED flashes 5 times, turn the dial fully counter clockwise.
Make sure LEDs do not flash for 5 minutes when racing or idling the engine.
If it flashes, count the number of flashes, turn engine off, and see the following 3 paragraphs. Perform real-time diagnosis inspection and repair or replace malfunctioning part if present.
if LEDs do not flash for 5 minutes, turn engine off.

If the RED LED flashes 3 times for 1.5 seconds, check the Crankshaft Position Sensor. Check the harness continuity at CPS when the engine is stopped. Inspect the harness for dust and clean if necessary. Check the pin terminal at ECU for bends and remove them as necessary. Reconnect harness and recheck continuity. During real-time diagnosis, tap the harness connector or component and check if trouble code is displayed. If so, replace terminal.

If the GREEN LED flashes twice-3 times for 0.5 seconds, check Mass Air Flow Sensor. Check the harness continuity at MAFS when the engine is stopped. Inspect the harness for dust and clean if necessary. Check the pin terminal at ECU for bends and remove them as necessary. Reconnect harness and recheck continuity. During real-time diagnosis, tap the harness connector or component and check if trouble code is displayed. If so, replace terminal.

If the GREEN LED flashes 4 times for 0.2 seconds 3 times, check the ignition signal. Check the harness continuity when the engine is stopped. Inspect the harness for dust and clean if necessary. Check the pin terminal at ECU for bends and remove them as necessary. Reconnect harness and recheck continuity. During real-time diagnosis, tap the harness connector or component and check if trouble code is displayed. If so, replace terminal.

Hope this helps...
__________________

Feb 11, 2018 | 1995 Nissan Pickup

3 Answers

2005 lexu 330, turn off maintenance light


1. With your car OFF, place your key in the ignition and turn to "On". Do not start the car.
2. Find the odometer button and press until it reads the total odometer setting, (not the Trip A or Trip B setting).
3. Turn the key to OFF.
4. Place your finger back on the odometer button, press and hold. At the same time, turn the key back to "On".
5. Hold the odometer button in until the MAINT REQD light goes out...should take about 8-10 seconds.

page 77 of the 2004 Lexus rx330 handbook...
(you will find the answer you are looking for in resetting your maintenance light.)
with the odometer reading visible, (not trip A or trip B..) turn off engine.

While keeping Odo/trip button depressed, turn ignition back on (not starting the engine) You will see dashes (instead of numbers) on your odometer disappearing one at a time. it will be replaced by 0's (zeros).. Release the Odo/trip button and your original mileage will come up....
And your done..... until the next oil change.

Thank you for using fixya and good luck

Oct 10, 2010 | 2005 Lexus ES330

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