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GMC Safari/Chevy Astro Electrical Issues

83 messages,  Last post on Nov 02, 2008 at 7:30 PM

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What is this discussion about? Chevrolet Astro, GMC Safari, GMC Safari Cargo, Electrical, Van

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#76 of 83 Re: Brake and ABS lights. [spike99] by egillett Jun 22, 2008 (5:32 am)
Replying to: spike99 (Jun 13, 2008 4:57 am) Very dangerous situation pulling the fuse. Yes you can stop but if you are in a bad accident, your screwed if they find the fuse pulled. Have the front wheel sensors cleaned and that will usually fix the problem. Replies to this message: spike99 (Jun 22, 2008 7:22 pm)
#77 of 83 Re: Brake and ABS lights. [egillett] by spike99 Jun 22, 2008 (7:22 pm)
Replying to: egillett (Jun 22, 2008 5:32 am) Thanks for your concern.... For your records, there's a known problem with the ABS system on the Astro/Safari vans. There's an official TSB but NO recall. Still amazes me why no formal recall. For details....   Bottom line is... Defector sensor (which needs to be replaced) or the existing sensor is too "rusted up" to work properly...    -----------------   .... Basically, dirty sensor mounting surfaces cause the signal to drop out at low speeds, which fools the ABS system into thinking that it is experiencing an ABS event when it's not.   Antilock Brake (ABS) Activation At Low Speeds (Clean Wheel Speed Sensor Mounting Surface) #02-05-25-006A - (11/26/2002) Antilock Brake (ABS) Activation At Low Speeds (Clean Wheel Speed Sensor Mounting Surface) 1999-2000 Cadillac Escalade   1995-1999 Chevrolet Silverado (Old Style)   1995-2000 Chevrolet Suburban, Tahoe (Old Style)   1995-2003 Chevrolet Astro Van, Blazer, S10   1995-1999 GMC Sierra (Old Style)   1995-2000 GMC Yukon, Yukon XL (Old Style)   1995-2001 GMC Envoy, Jimmy   1995-2003 GMC Safari Van, Sonoma   1995-2001 Oldsmobile Bravada   This bulletin is being revised to change model information. Please discard Corporate Bulletin Number 02-05-25-006 (Section 05 -- Brakes).   Condition Some customers may comment on ABS activation at low speeds, usually below 8 km/h (5 mph). Upon investigation, the technician will find no DTCs set.   Cause The cause of this condition may be an increased air gap between the wheel speed sensor and the hub reluctor ring due to rust and debris built up on the sensor mounting surface.   Correction Measure AC voltage and clean wheel speed sensor mounting surfaces.   1.. Raise the vehicle on a hoist. 2.. Disconnect both the front wheel speed sensor harness connectors. 3.. Place a DVM across the terminals of each sensor connector. 4.. Rotate the wheel with hand speed and measure the ACmV's. The reading should be at least 350 ACmV's. 5.. If the reading is between 200 and 350 ACmV's, remove the wheel, caliper and rotor in order to gain access to the speed sensor. 6.. Remove the wheel speed sensor and plug the hole to prevent debris from falling into the hub during service. 7.. Clean the speed sensor mounting surface on the hub to remove rust and corrosion.   Important Make sure that the sensor sits flat on the hub. If the sensor flange is distorted, replace the sensor.   8.. Apply a thin layer of bearing grease to the hub surface prior to sensor installation. 9.. Install either the original sensor or a new one in the hub and secure the sensor. Ensure that the sensor is seated flush against the hub. 10.. Install the rotor, the caliper and the wheel. 11.. Place the DVM across the sensor terminals and recheck the voltage while rotating the wheel by hand. The voltage should now read at least 350 ACmV's.
#78 of 83 1999 Safari SLE- morning no start by hawk24 Jul 28, 2008 (7:52 am)
My '99 Safari, for the last week or so will not start in the mornings and even longer into the day if it's rainy. I have had it on a scope and all systems, fuel pressure, and spark checked out ok. There was however signs of moisture under the distributor cap. I had new cap, rotor, cables and plugs installed but the problem occurred again last morning after a hot day cool night. Once the sun comes out I have no problems starting up. Replies to this message: spike99 (Jul 30, 2008 7:19 am) hawk24 (Jul 31, 2008 12:59 pm)
#79 of 83 Re: 1999 Safari SLE- morning no start [hawk24] by spike99 Jul 30, 2008 (7:19 am)
Replying to: hawk24 (Jul 28, 2008 7:52 am) A few months back, my 2001 Safari van didn't want to start either. Turned out to be bad distributor cap and bad rotor. After they replaced these items, it still wouldn't "consistantly" start. Especially on wet days. After some more testing, they replaced its battery. Funny thing was, that other battery was only 8 months old. They replaced the battery with higher cranking amps. Since then, my van's engine has started every time. Seems the other battery had enough "registered" power but not enough to fuel its starter and electrical system at the same time. Thus, it might or might not start. For my van, higher "cold" cranking amps in replacement battery seems to work. Been starting great ever since. Hopefully, new (stronger cranking) battery in your van helps as well...   . Replies to this message: hawk24 (Jul 31, 2008 12:59 pm)
#80 of 83 Re: 1999 Safari SLE- morning no start [spike99] by hawk24 Jul 31, 2008 (12:59 pm)
Replying to: spike99 (Jul 30, 2008 7:19 am) Thanks for that spike99...I have read that solution before but the problem was not similar to mine. Your issue however, seems to be exactly what I am experiencing. I will make the switch. Thanks.
#81 of 83 Re: 1995 GMC Safari that has no spark. [falconjim] by captainjerry Sep 28, 2008 (9:15 am)
Replying to: falconjim (May 18, 2008 4:18 pm) My 2000 GMC Safari had the same problem, The dealer replaced the Crank Sensor and found wires in the bundle that had heated up and fused themselves together. However, after over $1500 in money paid to the dealer, when they restored the spark, they found that that the Autozone Spark plug wires, when sprayed with a water mist while the motor was running, lit up like a christmas tree. They replaced the wires, the distributor cap (Autozone) and said they fixed it. The next rain, it would not start, back to the dealer. They said the Computer was bad and the cost for the compuer would be over $400 plus labor. I called GM and they said the computer is warranted for 80,000 miles, and after a long and angry discussion with the Service Rep, I called GM and they called the dealer. Computer + labor free! The next rain It would not start again, I pulled the dog house off and checked, Gas, good, spark not good. Removed the Distributor cap and removed the Rotor, well it had more burn marks on it than if it had been in a fire, and it was still the autozone one. It seems that the GM Dealer did not replace it...is that a way to pump more $ out of me? About a year and a half later the problem reappeared, so I removed the dog house, dist cap and the rotor was again burned and very dirty. I used the air gin and blew out the distributor and paid special attention to a recess and a hole in the bottom which was plugged. I even poked a small wire in it to see if it was open. No more problems yet, but If it does I know to replace the rotor with a genuine GM.
#82 of 83 power locks by pops9 Oct 07, 2008 (2:37 pm)
changed the battery in my 2002 Astro van because it was 5 years old had no starting problems ever since I changed it the power locks & dome light go on & off when I hit a bump & the front bounces or make a turn the battery is secure and the cables are tight & clean at the battery & starter all I did was replace the battery I even took the new battery back thinking it had a loose plate but it does the same thing with the second battery any ideas
#83 of 83 1997 GMC Safari - dim headlights on low beam by jrekj Nov 02, 2008 (7:30 pm)
My 1997 GMC Safari has dim headlights when on low beam. I have checked fuses (all ok), replaced both bulbs, and I;ve cleaned up numerous electrical grounds. The alternator is only a couple of years old. Any suggestions? Thanks.

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