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Old 04-29-2009, 02:38 PM
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Do-It-Yourself VSC ABS Break + Tire P. lights

New member old man. I have a 04 Gold HL Ltd (~39Kmiles) bought new in 04 while I was still working. Last week the VSC, ABS, Break and Tire pressure lights came on while driving normal. Scanned with actron cp9135 scanner showed no codes passed with lights on. Did some research, found to read DTS codes short pins 4 & 13 on scanner input connector, returned code 33 (right rear wheel speed abnormal). Reset code via pins 4 & 13 shorted and key on + pump brake pedal 8 times in 3 sec. Drove about 2 blocks and same lights came back on. Next checked resistance to rear wheel sensors w/ model 87 Fluke DVM at connector to Skid Control ECU pins 5(RR+) to 19(RR-) and 6(RL-) to 20(RL+)…both read 1.1xxK ohms, which is Good? I think. Other checks: gas cap tight, vacuum hoses on breather, fuses (any labeled ABS, ECU, IC, and the ones I didn’t know).
Can any one suggest anything else I can do before taking it to the local sealer. Thanks
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Old 04-29-2009, 03:25 PM
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Default Re: VSC ABS Break + Tire P. lights

If the RR sensor was just a little off, say missing every tenth rotation, then only the tire pressure light should come on. My gut is that it's not reading any rotations.

The part is ~200 bucks, so I'd be weary of just replacing it. I'd pull the RR wheel off and unplug/reseat the connector there, and under the passenger seat (which I guess you already did). If there's nothing there and no obvious damage, I guess I'd take it to the dealer and pay 75 bucks for a diagnosis over just throwing money at parts since it could just as easily be the wiring harness somewhere.

Then again, you know the wiring isn't shorted to the chassis because the resistance is correct, and 75 bucks wasted if they only tell you what you already know...
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Old 04-29-2009, 08:00 PM
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Thumbs up Re: VSC ABS Break + Tire P. lights

OK here’s the deal, bepper reminded me to be mechanical. For years I was a electronic/instrumentation tech. and have a tendency to think electrical. I hadn’t pulled the wheel (heavy too) to do a physical inspection. I found the sensor was cocked because the 6mm bolt holding the sensor was almost all the way backed out, about 1 ½ threads in. I tried to screw it in but it wouldn’t go. Backed it out and sprayed some skunk oil (wd40) and tried to screw it in a little at the time, in & out cleaning the threads. Got about half way and on the way out broke the bolt about 3 threads from the head. Tried to back it out with vice grips, noooo. Drilled a 5/32 hole to use an easy out, noooo. Wound up using a #6 SS Sheet-metal screw in the hole I drilled (monkey engineering) with enough washer/spacers to get it tight with about 2 ½ turns. Reset the codes as in first post and took it for a test drive. Lookadare… worked like a champ. Thanks bepper saved me $100+ I’m sure.
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Old 05-01-2009, 09:40 AM
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Default Re: VSC ABS Break + Tire P. lights

Wheel Speed Sensor was not not seated properly...thus not sensing the lobes correctly while spinning.

Great fix. It worked.
LT

Last edited by LifeTech; 05-01-2009 at 09:41 AM.
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