Rosser027

Okay so I would like to add VDIM to my 06 is250 AWD so I guess I'm trying to say... Is it possible? And if it is how much time+effort+money would be spent on it?

Gville350

iTrader: (10)

According to Wiki, our cars already have VDIM.

redspencer

iTrader: (1)

I believe the earlier IS250s only had VSC (and a bunch of other nannies acting independently) while the VDIM system remained exclusive to the IS350 for the first 2 or 3 years.

OP, as most of us find the VDIM system to be fairly intrusive when it comes to spirited driving, I would not recommend the conversion (if the conversion is even possible).

Rosser027

well i planned on doing an ISF engine nd tranny conversion nd i believe i may need VDIM for this conversion so its confusing as h*ll so yea but i understand it inhibits the driving experience

redspencer

iTrader: (1)

If you haven't already, you should take a look at mikellucci's thread as he's near completion with the same swap that you're interested in doing.
https://www.clublexus.com/forums/sho...d.php?t=712738

Rosser027

yea ive actually been talking with him!

Gville350

iTrader: (10)

As I'm looking over the Wiki posting again I'm seeing that Red you're right; it mentions the "2005" IS350 (I assume all future years) and the 2008 IS250. So the first few years of the IS250 doesn't appear to come with VDIM.

redspencer

iTrader: (1)

mikellucci

iTrader: (56)

I sent out the full wiring diagram of VDIM. Its touchpoints are plentiful and would require quite a few wire pins to be implemented to a non-vdim car. That said, its doable with proper planning and execution. I'd be real iffy about it after seeing what I've seen just with all the wiring differences on the ISF vs IS350 (vdim equipped).

Here are the VDIM ECU pinouts. Just skimming thru you can get a highlevel of critical touchpoints:

Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
A35-1 (SFRR) - GR - Front decrease solenoid RH output
A35-2 (SRLR) - R - Rear decrease solenoid LH output
A35-3 (MR) - L-B - ABS motor relay output Engine switch on (IG)
A35-4 (FLO) - R-L - Front wheel speed signal LH output
A35-5 (FRO) - G-W - Front wheel speed signal RH output
A35-7 (FR-) - G - Front wheel speed sensor RH input Vehicle speed (forward or backward) input
A35-8 (FR+) - L - Front wheel speed sensor power supply RH output Engine switch on (IG)
A35-9 (FL+) - P - Front wheel speed sensor power supply LH output Engine switch on (IG)
A35-10 (FL-) - L - Front wheel speed sensor LH input Vehicle speed (forward or backward) input
A35-11 (R+) - G - ABS solenoid relay power supply Engine switch on (IG)
A35-12 (SRRR) - W-L - Rear decrease solenoid RH output
A35-13 (SFLR) - W - Front decrease solenoid RH output
A35-14 (SSEL) - Y-B - Solenoid characteristic identification input 1 Engine start Low: 0 V (Normal)Middle: 3.7 to 8.26 VHigh: 7.8 to 14 V
A35-16 (SEL2) - B-L - Solenoid characteristic identification input 2 Engine start Low: 0 V (Normal)Middle: 3.7 to 8.26 VHigh: 7.8 to 14 V
A35-18 (FSW+) - G-B - Brake pedal load sensing switch input Stop light switch OFF → ON (Brake pedal depressed → released)
A35-20 (STP2) - R-B - Stop light control (BRK-LP) relay input Stop light switch ON → OFF (Brake pedal depressed → released)
A35-21 (STPO) - L - Stop light control (BRK-LP) relay output Engine switch on (IG)
A35-22 (GND3) - W-B - Skid control ECU ground 3 Always Below 1 Ω
J77-1 (IG1) - B - IG1 power supply Engine switch on (IG)
J77-3 (RL-) - B - Rear wheel speed sensor LH input Vehicle speed (forward or backward) input
J77-4 (RL+) - LG - Rear wheel speed sensor power supply LH output Engine switch on (IG)
J77-5 (RR+) - B - Rear wheel speed sensor power supply RH output Engine switch on (IG)
J77-6 (RR-) - G - Rear wheel speed sensor RH input Vehicle speed (forward or backward) input
J77-7 (CSW) - P - VSC OFF switch input VSC OFF switch ON → OFF Below 1 Ω →10 kΩ or higher
J77-8 (CANH) - R - CAN communication line H Engine switch off 54 to 67 Ω
J77-9 (SP1) - V - Speed signal output for combination meter While driving Pulse generation(see waveform 3)
J77-10 (STP1) - R - Stop light switch input Stop light switch ON → OFF (Brake pedal depressed → released)
J77-11 (BZ) - L - Skid control buzzer output Engine switch on (IG), buzzer sound → not sound →
J77-12 (D/G) - R - Diagnosis tester communication line Engine switch on (IG)
J77-13 (TS) - SB - Sensor check activation input Engine switch on (IG), terminals TS and CG of DLC3 connect → disconnect
J77-14 (PKB) - Y - Parking brake switch input Engine switch on (IG), parking brake switch ON → OFF
J77-15 (WFSE) - GR - ECU program rewrite input - -
J77-16 (CANL) - W - CAN communication line L Engine switch off 54 to 67 Ω
J78-1 (MRF) - Y - ABS motor fail safe relay output Approx. 1.5 seconds after turning engine switch on (IG)
J78-2 (SR) - V - ABS solenoid relay output Approx. 1.5 seconds after turning engine switch on (IG)
J78-4 (PMC) - R - Master cylinder pressure sensor input Engine switch on (IG), brake pedal released 0.3 to 0.8 V
J78-6 (E2) - W - Master cylinder pressure sensor ground Always Below 1 Ω
J78-7 (RRA+) - L - Rear holding solenoid (+) RH output
J78-8 (FLA-) - W - Front holding solenoid (-) LH output
J78-9 (RLA+) - G - Rear holding solenoid (+) LH output
J78-10 (FRA-) - GR - Front holding solenoid (-) RH output
J78-11 (SM2+) - B - Master cut linear solenoid 2 (+) output
J78-12 (SM1-) - R - Master cut linear solenoid 1 (-) output
J78-13 (AST) - Y - Linear solenoid power supply
J78-14 (GND2) - W-B - Skid control ECU ground 2 Always Below 1 Ω
J78-15 (MT) - GR - ABS motor relay test input Approx. 1.5 seconds after turning engine switch on (IG)
J78-18 (VCM) - B - Master cylinder pressure sensor power supply output Engine switch on (IG) 4.5 to 5.5 V
J78-19 (FSS) - Shielded - Master cylinder pressure sensor shielded ground Always Below 1 Ω
J78-20 (RRA-) - BE - Rear holding solenoid (-) RH output
J78-21 (FLA+) - V - Front holding solenoid (+) LH output
J78-22 (RLA-) - P - Rear holding solenoid (-) LH output
J78-23 (FRA+) - LG - Front holding solenoid (+) RH output
J78-24 (SM2-) - BR - Master cut linear solenoid 2 (-) output
J78-25 (SM1+) - SB - Master cut linear solenoid 1 (+) output
J78-26 (GND1) - W-B - Skid control ECU ground 1