python

iTrader: (4)

thats because those lights are letting u know theres an issue with a system other than emissions. i had a customer come in with a sequoia and her vcs trac off lights were on..turned out to be her yaw in the column. 700 for the part alone!

aptoslexus

Code 36 is zero point calibration of yaw rate sensor undone.
Code 43 is malfunction in abs control system.

GS4302001

OK, just to verify I have this straight:

1.a. Disconnect Battery Cable
1.a.i. Does disconnecting the battery clear the Zero Point Calibration Memory of the Yaw Rate Sensor, or is there something else I need to do to clear it?
1.a.ii. How long does it need to be disconnected. I imagine 2 minutes would be plenty of time for any capacitor to lose it's charge.

1.b. Reconnect Battery Cable (By the way, I removed and installed the battery cable several times over the last couple of weeks, including for hours while going to get a new battery)
Check: Do I need to turn the key on or start the engine, or what? I don't imagine the lights on the dash are going to come on unless I at least turn the ignition ON.
1.b.i. I don't think the lights go off until after the engine is started - I could be wrong, I just don't remember them going off until it's running.

2. P-range switch: Is this the switch that tells the computer it is in PARK? I don't have Page IN-30, do you? (I'm not being a smart alec, I'm just asking because I don't have it - it sounds like a smart alec comment, but it's not)

3. Yaw Rate Sensor: Located in the steering column, is that right? Do you have DI-390?

I suppose if I had DI-364 the answer to my 1.b. question would be obvious.

Before we go any further, if the problem is either of the above issues, is this going to cause the car to leave me sit if I don't fix it? It doesn't sound like it, but will it? I am not a real big fan of VSC anyway, so if it won't cause the car to not work and just throws the VSC OFF, ABS lights and CHECK VSC to be displayed, then I can live with it.

Thanks!

python

iTrader: (4)

u can try to reset the yaw..i would bet the sensor needs to be replaced if in fact thats ur problem

aptoslexus

My reading is that disconnecting the battery cable clears the zero point calibration. After re-connecting, put the car on level ground and turn the key to on for 15 seconds without moving the car to calibrate. By the way, I already posted DI-364 that details all this. Look at my previous posts. I have all the pages. I'll post any one you like. Your car won't be inoperable dealing with these things. The ABS might not be operable when you have a code set, however.

aptoslexus

GS4302001

Thanks!

I'll try this the next chance I get.

GS4302001

OK, my son has gone off to school and I started driving the LS400, again. Although I am not a big fan of VSC, I am even less of a fan of having warning lights on the dash! So, today I will attempt the yaw rate sensor calibration (this does seem to be the most likely culprit (since there is a Code 36 present).

It's raining today, but I don't get many chances. I will find a parking lot large enough and empty enough to allow the travel and turn required. This is what I plan to do:
1. Remove the battery cable and leave disconnected for 2 minutes
2. Reconnect the battery cable
3. Install a jumper between terminals E1 and Tc on the DLC1 (with ign sw OFF and steering wheel in neutral (straight position)
4. Turn ign sw ON
5. Verify DIAG displays
6. Press the function key until VSC is displayed
<Note: I have done all of the above previously and obtained Code 36 and Code 43>
7. Clear DTC by depressing brake pedal (fully so it trips the depressed switch AND the released switch) 8 times within 5 seconds (this didn't work the last time I tried, but maybe I wasn't depressing the brake pedal far enough).
8. If the above doesn't work to clear the codes, then perhaps I can try to just turn the ignition switch to ACC or LOCK while in test mode, during or after the next step.
9. Check VSC/Yaw Rate Sensor by following steps 2(a)(1) through (8) of DI-364 (Which aptoslexus so graciously provided - thanks aptoslexus!)

GS4302001

When I checked for VSC (i.e. performed steps 1 - 6 above), I only had Code 43 show up. I did the test multiple times. I also tried the 8 pumps of the brakes to clear the code, again to no avail.

So, I proceeded with the VSC/Yaw Rate Sensor check according to DI-364.

• When I started the car with the jumper installed between E1 and Tc on the DLC1, it did NOT go into VSC TEST mode. Rather, it simply did the DIAG and VSC, again - just like when the engine was not started but key was on.
• I blindly went ahead with the rest of the test, i.e. sat for about 10 seconds with the steering wheel in the neutral position, then drove slowly ahead, turned back 180 degrees and stopped. Nothing.
  • I forgot to do step 6, check the steering position sensor, but...
• I imagine, I need to do the DI-394 or DI-360 to account for the VSC TEST not coming on. aptoslexus, will you please post these two instructions?

I don't know if this comes into play, but the Brake Wear Indicator started to show up on the display (usually shortly after the ABS and VSC OFF lights come on), since the post I last made in August. I looked at the brake pads, they all have >3/8". I think the front sensor must be bad. I'll short the wires together tomorrow and see what we have, then.

Thanks!

GS4302001

OK, I see why nobody responded - because I didn't follow the directions for the VSC Sensor Check. I jumpered Tc to E1 instead of Ts to E1. However, I jumpered TS to E1 last night and again today and still didn't get VSC TEST to appear on the display. So, I need DI-394 and DI-360, if anyone has these to post.

I also found the wires I had spliced together on the rear break pad wear sensor had come apart. So, now the Brake Wear indicator no longer appears.

Another thing that I find kind of funny (in a strange kind of way) is the telescoping steering wheel doesn't make as much noise when it retracts and moves to its setting. I don't know why that would be, but before I started messing with this whole ordeal it always made noise when it was moving. Now, it is pretty quiet.

Thanks!

GS4302001

The last check I did using DI-364 down to the point of doing the VSC Sensor Check, I see I only have C1223/43 Malfunction in ABS control system. Does anyone have DI-382 for a 1999 LS400?

Also, since I wasn't able to get the VSC TEST to show up, I could also use DI-394 and DI-360 (please).

Thanks!

Sin1UZFE

OP did u ever get it resolved?