BIG wiring issue - gauge cluster not lighting up.

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06-23-08, 03:58 PM

#16

tavarish

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here are the diagrams that OLT posted:

https://www.clublexus.com/gallery/dat...erdiagram9.JPG

https://www.clublexus.com/gallery/dat...erdiagram8.JPG

https://www.clublexus.com/gallery/dat...erdiagram5.JPG

https://www.clublexus.com/gallery/dat...erdiagram4.JPG

https://www.clublexus.com/gallery/dat...erdiagram3.JPG

https://www.clublexus.com/gallery/dat...erdiagram2.JPG

https://www.clublexus.com/gallery/dat...erdiagram1.JPG

If someone can help me out, I'll paypal you a little something for helping out.

Thanks,
-Freddy

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06-24-08, 09:05 AM

#17

tavarish

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bump.....realy need help with this one.

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06-24-08, 09:52 PM

#18

gdc5ind

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i am having the same problem but i didnt touch the 2 ground bolts. does anyone know where that yellow wire with the 2 copper ground rings on the each end goes?

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06-30-08, 09:44 AM

#19

tavarish

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Problem found. i went over my wiring again, and one wire that I previously had labeled as ECT was a ground. Cluster works fine, but the fuel and water temp needles aren't working. No biggie though.

On a side note: The SC400 tach will not read right with a 1jz swap. I swapped out an SC300 tach, put it into the SC400 cluster, and it works fine.

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07-01-08, 03:47 PM

#20

gdc5ind

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whats your water temp read??

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04-19-09, 01:45 PM

#21

sc4002soar

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dam my cluster went out yesterday..........

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10-01-09, 11:58 PM

#22

bangdangvn

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Do you know which pin to hot wire to turn on cluster without having to plug into car? thanks

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10-02-09, 07:58 PM

#23

tavarish

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Quote:

Originally Posted by bangdangvn

Do you know which pin to hot wire to turn on cluster without having to plug into car? thanks

The entire cluster works off of several circuits. There's no simple power/ground.

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09-22-11, 08:24 AM

#24

Klaus

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Quote:

Originally Posted by tavarish

The entire cluster works off of several circuits. There's no simple power/ground.

OLD *** thread bump, but I'm trying to figure this out right now too. The supra and SC clusters are similar. My guage illumination is out. I tried bypassing rheostat and blew my panel fuse- is the illumination circuit 12v? Or is it lower? If lower, than my rheostat's probably bad, I'll need a new one, no big. But if it is 12v, then that means I have a short somewhere and I want to see if it's in my cluster. So is there any way to test the cluster illumination outside of the car?

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08-16-14, 06:30 PM

#25

mikef

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This helped me fix my problem with no cluster lights and steering wheel and seats only move when your not in acc

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11-29-22, 04:25 PM

#26

Dknapp

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Quote:

Originally Posted by tavarish

Here's the diagram and pinouts I made:

The ones I'm having an issue with are highlighted in bold.
Harness A (21 pin)

1-5 = Auto tranny (not used, i'm 5spd)
6 - X (not used)7 - seat belt
8 - fuel
9 - x
10 - airbag
11 - airbag pos (12v tested)
12 - open door
13 - parking brake
14 - charge pos (12v tested)
15 - charge
16 - A/T (not used)
17 - speed sensor
18 - O/D (not used)
19 - Oil
20 - Cruise (not used)
21 - X

Harness B (18 pin)

1 - Trac off (not used)
2 - x
3 - Check Engine light
4 - ECT (not used)
5 - Trac (not used)
6 - ground (tested)
7 - High beam
8 - oil level
9 - washer (not used)
10 - X
11 - rear light
12 - X
13 - X
14 - X
15 - ABS
16 - LH Turn
17 - RH Turn
18 - coolant

Harness C (23 pin)

1 - Power (12v tested)
2 - Rheostat
3 - Rheostat
4 - Rheostat
5 - Rheostat
6 - trip - Power (12v tested)
7 - fuel
8 - fuel
9 - Tach signal
10 - Ground (tested)
11 - Power (tested)
12 - Power? Ground? It tested as a ground, with 40 ohm resistance.
13 - speed sensor
14 - speed sensor to ECU (tested 12v???)
15 - speed sensor
16 - Trip
17 - Trip
18 - Trip
19 - Trip
20 - Trip
21 - Water temp (not used)
22 - ground (tested)
23 - ECT (not used)

As you see, my problem is in interpreting the diagram that OLT has provided, i'll post them up in a bit. The main discrepancies are in harness C. I dont know what the values for the rheostat and trip plugs are and should be, and pin 12 remains a mystery on whether it is a ground or power.

If anyone can chime in, I'd be very grateful.

Thanks,
-Freddy

Hey I know this is a 14 year old post but I'm having a similar issue and my c10 has continuity with both ground and positive I would imagine this is a short but I am not confident

Last edited by Dknapp; 11-29-22 at 04:28 PM.