I have 2007 lexus gs450h with a 3.5l engine with a few lights on the dash which are (brakes, abs, afs off, hybrid light) with 1 problem causing it all. I got the scantool on the car and the hybrid control codes are (u0129, u0133) the hybrid vehicle gateway codes are (u0122, u0126, u0132, u0123, u0130, u0131, u1003)
the electric motor power steering codes are (u0129)
The codes Variable gear ratio steering (u0122, u0126)
The electronic modulated suspension codes (u0122).... with zero communication to modules (abs, pre-collision system, occupant detection, and stabilizer ecus) i checked the bus system and they all appear to be working i even changed the abs module and still have no communication with the module, any ideas please it would be helpful

 

Please update your tread with year, model of your vehile, with ML. ect.
Thank you!

 

Fixed it i put it in original thread

 

Here you go and report back after your troubleshooting. Battery OCV shoud be ≥ 12.4 volts. let me know if you have any other questions.

 

ok so on canh and canl i got 62.7 ohms and when i try resistance on ground and battery i get open load (perhaps a good thing not to sure) i even checked the wave form at the abs module and its got wave form however it doesn't look like, ik normal older vehicle canbus like fords where high is where the line goes up and low is where the lines go down but on this one high and low are exactly the same they both go up and at the obd port its normal high or + goes up and low or - goes down but at the abs module (no communication with the module) both high and low show the exact same thing

 

Check this link it would help you diagnose this CAN related issue. Let me know if you have additional questions.

 

Thank you for the video i will definitely check some of these i checked the wiring diagram and this car has 2 separate canbus systems high speed and low speed, the obd2 port is on the low speed, but the modules not reading correctly are on the high speed side so i will try all this again on the high speed section, ill report back with findings

 

The CAN bus usually consists of a pair of twisted wires connecting to CANH terminal 6 and CANL terminal 14.

All modules on the CAN communication connect to these twisted wires

 

Ok i got every module almost communicating. Only modules not communicating still are the abs module (was the problem the entire time) and the vehicle dynamics control module (i have no clue what module that is) i tried 3 separate abs modules and can't get no communication with the abs module at all, its got ground its got power and the canbus communication wires are at the plug so i honestly dont know why its not communicating

 

Perform a pin drag and wiggle tests of the connector. There are many video on the web shows how to perform pin drag test. Good luck!

 

I dont have anything that will go inside the connector to perform the drag test, paperclips 2 big needles 2 big etc

 

Ok i have pulled up the wiring diagram again and there appears to be a third data wire on connector A13 pin 25 color green/black where does this wire go so i can check both ends of it all my diagram says is it goes to computer data lines system

 

To the TS terminal 12 of the DLC.

 

Awesome, maybe its that wire why my scantool cant communicate with the module perhaps, i shall check continuity on this wire from the plug to the module and see if its free from shorts or being broken.

 

I replaced the plugs on the abs module and changed the module 3 separate times with a known working one however i still cant communicate with the module, if the canbus is plugged in under the dash the waveform goes crazy (happens with all 3 modules) and the ecu throws high canbus codes and shuts the car down (the werid canbus issue is intermittent, it doesn't always happen) and the green and black wire that goes to the plug for the obd2 connector wire is good, idk what else to do tbh