Question about 1999 Chevrolet Silverado 1500

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No 4x4 1999 Chev Silverado with the shift on the floor. Had 4x4 but next day didn't. Checked the plug on the actuater and there is 1 source of power all the time (in 4x4, 2x4 or N). Wondering if there should be 2 sources of power or what? The lite on the dash says 4x4. How does one find out if the actuater is working or not? Checked all the fuses and they are fine. Please help!

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  • Chevrolet Master
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Chances are the transfer case motor is sticking, tap the motor with a ballpen hammer and try it again.

Posted on Apr 23, 2009

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Posted on Jan 02, 2017

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94 merc grandmarkee wont go into park wont start will start if you wiggle in nutral


Park neutral safety switch could be bad , also the shift interlock safety system .
Shift Interlock System A brake/shifter interlock system consists of the following:
  • ignition switch (11572)
  • brake pedal stoplight switch (13480)
  • brake shift interlock module
  • brake shift interlock solenoid assembly (attached to key interlock assembly)
  • necessary wiring
On floor-shift vehicles, the ignition/shifter interlock cable (3F719):
  • locks the floor shift transaxle range selector lever in the PARK position when the ignition switch is in the LOCK position.
  • requires the floor shift transaxle range selector lever to be in the PARK position to turn the ignition switch to the LOCK position.
Condition Possible Source Action
  • Shift Interlock System Does Not Release or Lock Properly
  • Circuitry open/shorted.
  • Blown fuse.
  • Damaged stoplight switch.
  • Damaged shift lock actuator.
  • GO to Pinpoint Test A .

PINPOINT TEST A: SHIFT INTERLOCK SYSTEM DOES NOT RELEASE OR LOCK PROPERLY A1 CHECK ELECTRON IGN FUSE
  • Check Fuse 5 (5A) located in fuse junction panel.
Is fuse OK?
Yes No GO to A3 . GO to A2 . A2 CHECK FOR SHORT TO GROUND
  • Turn ignition switch OFF.
  • Remove Fuse 5 (5A).
  • Disconnect shift-lock actuator connector C203 located to the right of steering column.
  • Measure resistance of the Circuit 1003 (GY/Y) between the correct terminal of Fuse 5 (5A) and ground.
Is resistance greater than 10,000 ohms?
Yes No REPLACE Fuse 5 (5A). GO to A3 . SERVICE Circuit 1003 (GY/Y) wire between fuse junction panel and shift-lock actuator. A3 CHECK POWER SUPPLY FROM FUSE 5 (5A)
  • Reinstall Fuse 5 (5A).
  • Turn ignition switch to RUN.
  • Measure voltage on Circuit 1003 (GY/Y) wire and ground.
Is voltage greater than 10 volts?
Yes No GO to A4 . SERVICE Circuit 1003 (GY/Y) wire between interior fuse panel and shift-lock actuator. A4 CHECK POWER SUPPLY FROM FUSE 28 (15A)
  • Turn ignition switch OFF.
  • Disconnect connector C2016.
  • Turn ignition switch ON.
  • Measure voltage on Circuit 10 (LG/R) and ground.
Is voltage B+?
Yes No GO to A5 . SERVICE Circuit 10 (LG/R) for open. RESTORE vehicle and RETEST system. A5 CHECK WIRE BETWEEN STOPLIGHT SWITCH AND SHIFT-LOCK ACTUATOR
  • Turn ignition switch OFF.
  • Disconnect shift-lock actuator connector C203.
  • Apply brake pedal.
  • Measure voltage on Circuit 810 (R/LG) wire and ground.
Is voltage greater than 10 volts with brake pedal applied and less than 1 volt with brake pedal released?
Yes No GO to A6 . SERVICE Circuit 810 (R/LG) wire between stoplight switch and shift-lock actuator. A6 CHECK SHIFT-LOCK ACTUATOR GROUND
  • Measure resistance of Circuit 57 (BK) and ground.
Is resistance less than 5 ohms?
Yes No REPLACE shift-lock actuator. SERVICE BK wire.

Mar 30, 2017 | Cars & Trucks

1 Answer

My 2007 Lincoln MKZ gear shifter is getting stuck in park and comes out after trying a little while, not every time but its increasing more and more.


On your vehicle there is a shifter interlock system ,it's a safety feature . Doesn't allow shifter to be put into gear if your foot isn't on the brake pedal .
Visual Inspection Chart Mechanical Electrical
  • Transmission shift cable
  • Manual control lever
  • Transmission control module out of adjustment (6-speed transaxle)
  • Fuse
  • Connections
  • Wiring harness
  • Brake pedal position (BPP) switch
  • Shift lock actuator
  • Transmission control (TC) switch (MKZ)
Diagnostic Trouble Code (DTC) Chart
DTC Component Description Condition Symptom Action B2572 Brake Shift Interlock Brake Shift Interlock Output Circuit Failure The associated circuitry connected to the smart junction box (SJB) or fuse, or the SJB itself may have an issue causing a brake shift interlock concern. Brake shift interlock is inoperative or does not operate correctly. Go To Pinpoint Test A . Symptom Chart
SYMPTOM CHART Condition Possible Sources Action
  • Shift interlock system does not release/lock correctly
  • Circuitry open/shorted
  • Fuse(s)
  • Stoplight switch
  • Go To Pinpoint Test A .
  • Shift interlock system does not release/lock correctly
  • Shift lock actuator
  • INSTALL a new selector lever assembly. REFER to Selector Lever in this section.
PINPOINT TEST A: THE SHIFT INTERLOCK SYSTEM DOES NOT RELEASE/LOCK CORRECTLY Test Step Result / Action to Take A1 TEST THE BRAKE LIGHTS
  • Apply the brake pedal and view the brake lights.
  • Do the brake lights illuminate?
Yes
GO to A2 .

No
REFER to Section 417-01 . A2 TEST SHIFT INTERLOCK ACTUATOR POWER CIRCUIT
  • Disconnect: Floor Shifter Harness Connector C3245.
  • Key in ON position.
  • Vehicles equipped with a 3.0L or a 2.3L engine, measure the voltage between floor shifter harness connector C3245-1, vehicle harness side and ground, while applying the brake pedal.
    s7s~tr~en~file=n0042138.gif~gen~ref.gif
  • Vehicles equipped with a 3.5L engine, measure the voltage between floor shifter harness connector C2096-1, vehicle harness side and ground, while applying the brake pedal.
    s7s~tr~en~file=n0053796.gif~gen~ref.gif
  • Is the voltage greater than 10 volts?
Yes
GO to A3 .

No
REPAIR the circuit. TEST the system for normal operation. A3 TEST SHIFT INTERLOCK ACTUATOR GROUND CIRCUIT
  • Key in OFF position.
  • Vehicles equipped with a 3.0L or a 2.3L engine, measure the resistance between floor shifter harness connector C3245-4, vehicle harness side and ground.
    s7s~tr~en~file=n0042139.gif~gen~ref.gif
  • Vehicles equipped with a 3.5L engine, measure the resistance between floor shifter harness connector C2096-5, vehicle harness side and ground.
    s7s~tr~en~file=n0053797.gif~gen~ref.gif
  • Is the resistance less than 5 ohms?
Yes
INSTALL a new selector lever. REFER to Selector Lever in this section.

No
REPAIR the circuit. TEST the system for normal operation. Don't try to force it , you'll break something !

Sep 22, 2016 | 2007 Lincoln MKZ

1 Answer

Remove heater ac air posion moter on 2008 chev pickup


I think the part is called the blend door actuator.
1.You have to remove the plastic cover on passenger side. Motor is located over the transmission hump.
2. Remove wiring harness plug.
3. Remove 3 hex head screws.
You need a small 1/4 socket set.

Feb 22, 2015 | 2008 Chevrolet Silverado 1500 2WD

1 Answer

04 silverado 4x4 won,t engage


when the actuator goes, usually the fuse goes as well, check your fuses.

Dec 17, 2013 | Cars & Trucks

1 Answer

The heater/vent system will not blow warm/hot air even when dialed to 90 degrees on climate control


On a newer truck such as yours, the problem is usually the blend door actuator. First try a recalibrations of the system. Remove the HVAC fuse for a couple minutes and then put it back in. Start the truck and let it idle for a few minutes. Check to see if that fixed it.
If not, next check the actuator. I will paste instructions below for taking it out. Once you have it out, plug the connector back in and see if it turns when you change the temperature control. If not, the problem can be in the controller or the actuator. If it is clicking, the problem is stripped gears. If it isn't doing anything, you can check for voltage at the connector with a voltmeter. Connect the black meter lead to a good ground point and probe the connector terminals with the red lead while changing the temperature setting. The part costs $140, so do what you can to make sure it's bad before putting a new one in. Also, it may be worth your time to read my post at http://www.fixya.com/cars/r6235876-no_heat_fan_blowing_cold_air for other ideas. Please let me know if you have questions.

  1. Remove the floor air outlet duct extension (1) from the floor duct (2).
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Fig. Remove the floor air outlet duct extension (1) from the floor duct (2)

2. Disconnect the electrical connection at the blend door actuator (10).

3beb6ca.gif

Fig. Blend door actuator and related components


3. Remove the blend door actuator mounting screws from the HVAC module.

4. Remove the blend door actuator as an assembly with the actuator cam.

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Fig. Remove the blend door actuator mounting screws from the HVAC module

Oct 31, 2010 | 2006 Chevrolet Silverado

2 Answers

I have a 2002 Chevy Silverado 8 cylinder 4wd extended cab. It has the push button shifter for 4wd. When I try to use 4WD Auto or 4WD Hi, the indicator lights come on but the 4wd does not engage. I read...


Fuse is located at the end of eh dash on drivers side and the Actuator is located at the front differential and on the passenger side.
When in 4wd mode, a switch on top of the transfer case conducts 12 volts out to the actuator. Wire #50 (brown) is the 12v feed, and it conducts to the light blue wire (#900) to the actuator.
When shifted out of 4wd, the switch opens up and no voltage goes to the actuator.

Check voltage at the connector for the front actuator (at the front differential - it looks like a large bullet that threads into the front diff.) If it has 12 volts, the actuator is the problem. If it does not have 12 volts, check the transfer case switch and the power feed to the transfer case.

I'll assume it is the actuator, if the plug to the actuator is getting 12 volts when in 4wd.
The way this actuator works, is it is a sealed chamber that gets heated by voltage. When it heats, the pin in the end swells and pushes a shift fork in the front differential. The shift fork engages a spline on the passenger side of the differential, and boom! you have 4WD.

GM offered an upgrade to this actuator that is a motor instead of a heated device. However, it requires a small harness addition, a spacer, and a new actuator. It is about a $150 to $200 option.

Good luck. The actuator is usually the problem 90% of time but recheck all of the wire harness just to maker sure there is no short before replacing any parts. The actuator may not be fully engaged or disengaged and the fork to the spline may be what is causing the grinding.

88-UP C/K ACTUATOR UPGRADE
VEHICLE SERVICED: 88-99 CHEVROLET FULL SIZE
PURPOSE: IMPROVE AXLE CONNECT ENGAGEMENT TIME AND
COMPONENT RELIABILITY.

SYMPTOMS: NO FRONT DRIVE AXLE ENGAGEMENT WHEN SHIFTED INTO 4X4.

Obtain the following GM part numbers:
(1) 26060073 Actuator
(1) 88959465 Harness/Spacer Kit

Feb 03, 2010 | 2002 Chevrolet Silverado

1 Answer

Automatic transmission will not shift out on my '92 chev silverad


check the governor for sticking valves drive gear worn.governor weights or springs binding.check 1-2 shift valve sticking.check the 2-4 band damage or worn band or band not engaged in anchor pin.

Apr 21, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

2005 chev silverado automatic transmission won't shift into high


could be just a shift solinoid ,a tranny shop can scan it and replace it.





Feb 22, 2009 | 2005 Chevrolet Silverado 1500 2WD

1 Answer

1999 CHEVY Z71 4X4 STUCK IN 4X4


i had the same problem and it ended up being short in the front axles where the actuator at or the switch on the transfer case under body where the shift lever at

Oct 22, 2008 | 1999 Chevrolet Silverado 1500

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