I was recently asked to look up part numbers for the various HICAS controllers, I thought I'd post my findings here as I couldn't easily find anything else online with this info. I hope this can help someone else in the future. Keep in mind HICAS was limited only to factory twin turbo models through the entire production run so the below details only relate to these models. Model Year: 1989-07 - 1989-12 Applicability: 2+0 & 2+2 Part number: 28505-43P00 Replacement: 28505-43P50 Appears there was a different part number for very early builds, likely Nissan changed manufacturer or design on the original unit as they are listed as interchangable. Model Year: 1989-12 - 1993-09 Applicability: 2+0 & 2+2 Part number: 28505-43P50 Then there was a part number change when Nissan went from hydraulic to electric HICAS. Model Year: 1993-09 - 1996-07 Applicability: 2+0 & 2+2 Part number: 28505-50P10 Model Year: 1996-07-01 - 1997-01-01 Applicability: 2+0 & 2+2 Part number: 28505-50P15 Interestingly, in 1997 the 2+2 got a new part number for the controller. Model Year: 1997-01-01 - 1998-10-01 Applicability: 2+0 Part number: 28505-50P15 Applicability: 2+2 Part number: 28505-49P10 Then at the end of 1998 for the 2k spec model, they got unique part numbers for each wheelbase. Model Year: 1998-10 on Applicability: 2+0 Part number: 28505-VP100 Applicability: 2+2 Part number: 28505-VP120
Hi Ryan That’s great, thank you! Z1 Motorsports has a second hand unit for sale. The part number sticker says “28505-48P10”. The Z1 stock control guys haven’t listed as coming from a 94 TT. Do you know where in the config family this part number sits? Will it work in my JDM 94 TT? Many thanks in advance MDL
Good question, I should've clarified in my original post that the P/N's apply to RHD JDM cars only. I've not looked into the LHD stuff too closely however assume that if the mounting points are all the same then the different part number would likely indicate a different configuration in the controller. If I were to take a guess I'd say RHD would be configured to handle more hard right hand down turns while LHD would be set for more left hand down turns. It likely will plug in and work however may not function 100% correct. I'd suggest as long as it is an electric ECU to electric rack then it will work ok and may even be more suited to a LHD country but can't confirm this for sure. If you decide to purchase it and fit it I'd be keen to hear the results, however also curious to know why you're considering replacing it in the first place as I've never heard of a HICAS controller failing?
Hey Ryazan Thanks for that! I agree - probably a LHD unit, so you can’t guarantee compatibility in a RHD car. The reason that I’m trying to replace the HiCAS unit is because the yellow “HiCAS Error” light on the dash is coming on, so I assumed that it is indicating a faulty control unit. What other common causes of this error are you aware of? Many thanks MDL
The error light is activated by the float sensor attached to ( under) your reservoir cap. Check your fluid level isn’t low which will trigger it, and that the float isn’t sticking on its shaft or catching on the filter screen.
Sorry to be a numpty - you mean the power steering reservoir, right? My car has the electric HiCAS (JDM ‘94), so is this still the case? I thought the reservoir warning only applied to hydraulically activated systems? Many thanks MDL
Ah , sorry mate. Yes I’m referring to power steering /hydraulic systems, so disregard that. Hopefully though it’s still something simple . Looks like you’ll be getting busy with a multimeter. Best of luck, Andy.
From an old post…. In case you don't have this info already, these are the pages from the '96 FSM for the Electric HICAS. The circuit, wiring diagrams and system diagnostics are included. https://drive.google.com/file/d/15KOB6QOw_ZE0oRByHuLk0Tf3BSsGswBu/view?usp=sharing Also from that post… “there appears to be 2 fuses in drivers kick panel relating to this system. I went thru and found a second blown fuse and now its all functioning again.” Hope this helps, Cheers, Andy.
If you're wanting to keep the HICAS (which being the electronic version I'd recommend) the only tools that can do HICAS diagnostics are Conzult, or a dealership that still has the original Nissan Consult scantool. If you don't have access to these, the FSM also details the pedal dance you can use to pull diagnostic code/s from the HICAS controller to indicate where your fault/s lie.
