BIG wiring issue - gauge cluster not lighting up.
#16
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
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
#19
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.
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.
#24
Instructor
iTrader: (1)
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?
#26
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
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
Last edited by Dknapp; 11-29-22 at 04:28 PM.
Thread
Thread Starter
Forum
Replies
Last Post
attis
SC- 1st Gen (1992-2000)
4
04-15-08 06:53 AM
lex400sc
Lexus Audio, Video, Security & Electronics
6
10-10-04 09:30 AM