Can someone tell me what these wires are for? - JeepForum.com
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post #1 of 17 Old 04-09-2019, 05:05 PM Thread Starter
Fernando
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Can someone tell me what these wires are for?

Dear JeepForum, I keep working on my new to me 1997 Grand Cherokee... under the rear seat, I found this wiring harness all hacked and slashed... seems like it was cut off then reattached, it beats me why anybody would do this, some of the wires are joined together with masking tape... (gotta love the PO)...

I also found my ABS light was on, the bulb was missing from the dash (I kinda expected this) when I went under the car to take a look I found the ABS sensor cables hacked as well, I believe the ABS wires connect here from the rear wheels, but there is only one connected and both are cut off.

Anyway, please look at the pictures, I will try to restore the ABS system, if I can't then I may remove it altogether, but I'd like to try and save it... in the meantime, I need to know what these wires are for.

Thanks!







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post #2 of 17 Old 04-09-2019, 05:17 PM
kg6mov
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Looks like somebody deleted the factory infinity amp.
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Originally Posted by Texas ZJ1 View Post
I heard someone yell "mall crawler" from the back porch. I'll go see who said that. Be right back.
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post #3 of 17 Old 04-09-2019, 05:26 PM Thread Starter
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Quote:
Originally Posted by kg6mov View Post
Looks like somebody deleted the factory infinity amp.
Thank you! there is an aftermarket radio installed, it works, not sure if it is powering all speakers...


Quote:
Originally Posted by JeepHammer
I don't mind writing for Fernando because he reads, and re-reads EVERY WORD!... Good to write for someone that actually READS the answer, and takes time to UNDERSTAND what comes back for an answer!
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post #4 of 17 Old 04-09-2019, 05:48 PM
kg6mov
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The taped together sections are likely acting as an amp bypass, that's a common cheap way to do it. If you're lucky the stock wiring has been abandoned and they ran new cables cleanly.

I'd bet more on the former.

This is from a 98 fsm, and should match a 97. You should be able to match the colors and decipher how it's been setup.
amp-connectors-98.jpg


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1984 F250, 460 BB, T19, work truck/future tow pig
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Originally Posted by Texas ZJ1 View Post
I heard someone yell "mall crawler" from the back porch. I'll go see who said that. Be right back.
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post #5 of 17 Old 04-09-2019, 09:27 PM
1stZJTRUCK
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Yes that is where my amp was located also the wires to the fuel tank and rear abs
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post #6 of 17 Old 04-09-2019, 09:31 PM
Cutlass327
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As for "removing the ABS", If you cannot fix it, just pull the bulb. No need to remove anything, as when the amber bulb is lit, it is basically operating like it never had ABS in the first place. If it is a red brake light, it is a hydraulic issue or e-brake switch.

Rick

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post #7 of 17 Old 04-09-2019, 11:31 PM Thread Starter
Fernando
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Quote:
Originally Posted by kg6mov View Post
The taped together sections are likely acting as an amp bypass, that's a common cheap way to do it. If you're lucky the stock wiring has been abandoned and they ran new cables cleanly.

I'd bet more on the former.

This is from a 98 fsm, and should match a 97. You should be able to match the colors and decipher how it's been setup.
Attachment 3817111
Thank you so much... I will test if all speakers work... I guess the amplifying comes from the new radio now?


Quote:
Originally Posted by Cutlass327 View Post
As for "removing the ABS", If you cannot fix it, just pull the bulb. No need to remove anything, as when the amber bulb is lit, it is basically operating like it never had ABS in the first place. If it is a red brake light, it is a hydraulic issue or e-brake switch.
Do you know by any chance where the ABS computer is located? Thanks!!


Quote:
Originally Posted by JeepHammer
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post #8 of 17 Old 04-10-2019, 01:16 AM
kg6mov
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On a 97 the ABS is part of the PCM IIRC?

Yup, the wires for the speakers at the radio are the same with or without the amp, so with a bypass it's just feeding the doors off the new head.

Not great, but better than a broken infinity amp I guess.


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Quote:
Originally Posted by Texas ZJ1 View Post
I heard someone yell "mall crawler" from the back porch. I'll go see who said that. Be right back.
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post #9 of 17 Old 04-10-2019, 11:30 PM Thread Starter
Fernando
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Quote:
Originally Posted by kg6mov View Post
On a 97 the ABS is part of the PCM IIRC?

Yup, the wires for the speakers at the radio are the same with or without the amp, so with a bypass it's just feeding the doors off the new head.

Not great, but better than a broken infinity amp I guess.
Thank you so much for the help... I guess the stock radio is just a faceplate at the front and the amplifier drove the stock speakers? I know nothing of car audio... I wonder if the radio was louder when the amplifier was working


Quote:
Originally Posted by JeepHammer
I don't mind writing for Fernando because he reads, and re-reads EVERY WORD!... Good to write for someone that actually READS the answer, and takes time to UNDERSTAND what comes back for an answer!
-------------------------------
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post #10 of 17 Old 04-11-2019, 12:06 AM
ZeeJay1997
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ABS computer on a 97 is just fwd of the master cylinder


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post #11 of 17 Old 04-11-2019, 04:13 AM
Timo_90xj
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Yeap, ABS brain box is part of the HCU unit, not in the PCM.


As has been mentioned, the larger connectors are for the infinity amp, the two small connectors are for the rear ABS sensors.

1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...


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***Under construction***
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post #12 of 17 Old 04-11-2019, 10:21 AM Thread Starter
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Quote:
Originally Posted by ZeeJay1997 View Post
ABS computer on a 97 is just fwd of the master cylinder
Is it at the box where all the lines meet? I see a big wiring harness connected to it

Quote:
Originally Posted by Timo_90xj View Post
Yeap, ABS brain box is part of the HCU unit, not in the PCM.


As has been mentioned, the larger connectors are for the infinity amp, the two small connectors are for the rear ABS sensors.
Thank you so much!


Quote:
Originally Posted by JeepHammer
I don't mind writing for Fernando because he reads, and re-reads EVERY WORD!... Good to write for someone that actually READS the answer, and takes time to UNDERSTAND what comes back for an answer!
-------------------------------
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post #13 of 17 Old 04-11-2019, 10:49 AM
Timo_90xj
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Quote:
Originally Posted by Fernando View Post
Is it at the box where all the lines meet? I see a big wiring harness connected to it

Yeap, the machined aluminum chunk with five brake lines (two in, three out) is the ABS hydraulic control unit (HCU), and the brain box is attached to it.

1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...


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1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***

***Under construction***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***
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post #14 of 17 Old 04-11-2019, 11:24 AM
GChief
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Hate to Hi jack but this fits. Where could I find the pin out for a 95 with the Infinity system? Are they the same? Only my passenger dash and door speakers are working.
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post #15 of 17 Old 04-11-2019, 01:38 PM
kg6mov
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The 95 is just different enough to hurt my brain. I don't have a digital 95, so here's transcription.

C323
1 - 16LB/RD - OUT RIGHT FRONT DOOR +
2 - 16LB/BK - OUT RIGHT FRONT DOOR -
3 - 16TN/RD - OUT RIGHT REAR DOOR +
4 - 20VT/YL - IN RIGHT FRONT DOOR +
5 - 20DB - IN RIGHT FRONT DOOR -
6 - 16TN/BK - OUT RIGHT REAR DOOR -
7 - 18GY/OR - ENABLE SIGNAL FROM RADIO
9 - 20DB/WT - IN RIGHT REAR DOOR +
10 - 20DB/OR - IN RIGHT REAR DOOR -

1 - 16WT/RD - OUT LEFT REAR DOOR +
2 - 16VT - FUSED B+
3 - 16LG/RD - OUT LEFT FRONT DOOR +
5 - 20BR/YL - IN LEFT REAR DOOR +
6 - 20DG - IN LEFT FRONT DOOR +
7 - 20BR/RD - IN LEFT FRONT DOOR -
8 - 20BR/LB - IN LEFT REAR DOOR -
10 - 16BK - GROUND
11 - 16BK - GROUND
12 - 16LG/BK - OUT LEFT FRONT DOOR
13 - 16VT - FUSED B+
14 - 16WT/BK - LEFT REAR DOOR -
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Quote:
Originally Posted by Texas ZJ1 View Post
I heard someone yell "mall crawler" from the back porch. I'll go see who said that. Be right back.
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