Question about 1996 Chevrolet K1500

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How to repace the transfer case control module on a 1996 chevy 4x4 silverdo truck

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6ya6ya
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Posted on Jan 02, 2017

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freetek
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SOURCE: install fuel pump on 1996 chevy 1500

Is the fuel pump really bad?

Our son's erstwhile Ford something had a shock sensitive switch that when tripped by a big pothole, shut the (electric) fuel pump off and had to be reset before it would function again.

Posted on Jul 02, 2008

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SOURCE: 2000 s10 blazer 4x4

i need a picture diagram so I can replace the motor on the transfer case.

Posted on Oct 10, 2008

  • 32 Answers

SOURCE: Chevy Transfer Case

The most common thing to go wrong with chevy transfercase is the rear tailshaft has a snap ring that breakes. Just remove the bolts holding it on and inspect the shaft and see if the snap ring is broken.Then just replace it with a new on from the dealer.

Posted on Feb 12, 2009

  • 7 Answers

SOURCE: transfer case clunk 2000 chevy silverado 1500 4x4

One thing to check, which is often the culprit in these situations is the U-joints. With the truck off, crawl under the vehicle and grab hold of the shaft leading into as well as the shaft going out of your transfer case, If htere is a lot of "slop in it, chance are it is in need of repair. Also I would check the oil level in the transfer case, in an attempt not to challenge you intelligence, there should be a plug located in the lower part about 2 inches from the bottom or so. it usually has a square hole that a 1/2" ratchet fits into. Pull the plug, and stick your pinky into the hole, you should be able to feel the lubricant just below the hole, if not it is in dire need of a filling. also check for metallic remnants in the fluid. this is a sign that things are not as they should be. In that case contact a repairman for a more thorough look.

Posted on Jul 13, 2009

BeninVa
  • 389 Answers

SOURCE: delay wipers only work on

Hello, my name is Ben and I can help you with this problem. This is a very common problem with Chevy. You need what is known in most vehicles as a "pulse board". The pulse board is located inside the wiper motor control module. On many vehicles the pulse board is replaceable, unfortunately on your Silverado you must replace the entire Wiper Motor Control Module which is bolted onto the top of the wiper motor. To get to the wiper motor, first remove those little nut covers on the big end of the windshield wiper arms, if you slip a small screwdriver or your fingernail they just pop off. Now unbolt the windsheild wiper arms, before removing the wiper arms, mark their location on the windsheild with a grease pencil or magic marker. The arms are hard to remove, you need to kinda wiggle and pull at the same time, now that long plastic cowl needs to come off, those clips at the front edge just slide forward, then at each end lift up that rubber flap and remove those TORX screws. Remove the cowl and set it somewhere SAFE, it's easy to break. You will now see the control module mounted on the wiper motor, unplug the electrical connections and remove the TORX screws holding it to the motor. Assembly is the reverse of dis-assembly. If you have any trouble or questions, feel free to ask, Ben.

Posted on Nov 13, 2010

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I have a ratteling /noise comming from my 05 trailblazer ext lt transfer case when hot


Chevy and GMC Transfer Case Problem - YouTube

? 2:32
www.youtube.com/watch?v=Nj5ZS8wOmNk
Jan 30, 2010 - Uploaded by beaud1ns i have a 2004 chevy silverdo with a np8 transfer case that went .... that little anti rattle clip on the case is removed and a new wide one that fit ...

Sep 09, 2015 | Cars & Trucks

1 Answer

2000 chevy siverado z71 4x4 not working


Yes we can ! With the light on and or flashing , DTC'S - diagnostic trouble codes are stored in the 4X4 control module . Have the codes check , not at auto zone or any other parts stores . There code reader tool will not pull this codes . Need to take to a qualified repair shop . Testing also needs to done , not guessing an throwing parts at it . This 4X4 system can set a number of codes .
DTC B2725 ATC Mode Switch Circuit Malfunction
DTC C0300 Rear Speed Sensor Malfunction
DTC C0305 Front Speed Sensor Malfunction
DTC C0308 Motor A/B Circuit Low
DTC C0309 Motor A/B Circuit High
DTC C0310 Motor A/B Circuit Open
DTC C0315 Motor Ground Circuit Open
DTC C0323 T-Case Lock Circuit Low
DTC C0324 T-Case Lock Circuit High
DTC C0327 Encoder Circuit Malfunction
DTC C0362 4LO Discrete Output Circuit High
DTC C0367 Front Axle Control Circuit High
DTC C0374 General System Malfunction
DTC C0376 Front/Rear Shaft Speed Mismatch
DTC C0387 Unable to Perform Shift
DTC C0550 ECU Malfunction
DTC C0611 VIN Information Error

DTC C0387 Unable to Perform Shift
Circuit Description
The transfer case encoder is a switch that converts a shaft position, representing a mode or range position, into electrical signals for use by the transfer case shift control module. The encoder houses 4 Hall effect sensors that are used for channels P, A, B, and C. These sensors provide a path to ground, when a magnet, (part of the Motor Encoder), passes over them.
The transfer case shift control module supplies an 8 V reference and a ground circuit for the encoder hall effect sensors to function.
The transfer case shift control module supplies current limited 5 V on all the channels, thus as these channels are pulled to ground, the module can interpret the location of the transfer case shift position.
This DTC detects that the transfer case is unable to successfully complete a shift to a requested mode or range.

May 07, 2017 | 2000 Chevrolet Silverado 1500

2 Answers

2000 jimmy cant turn 4 wheel drive on pushed thev button n light keeps on flashing n 4 wheel drive


The simple answer is to replace the TCCM (transfer case control module).
Being both cheap and inquisitive, I wanted to investigate further, and I will provide a more in-depth answer.

This answer pertains to various GM vehicles. These include the Chevy Blazer, GMC Jimmy, S10, S15, Sonoma vehicles from 1999, 2000, 2001, 2002, 2003, 2004, & 2005.
Specifically the 15748800 module for the NP8 option 4 button automatic 4X4 NVG-236/246 transfer case.

I doing research online, I find that 15154323 might be an alternate TCCM, and that GM redesigned the module and now sells the replacement for this module with a 12577412 part number for about $300.

This information refers to the 15748800 module.
2000-jimmy-turn-4-bqqpoqfgk1hfvr1c2liydaq2-3-0.jpg Symptoms. If the vehicle is started and driven in 2 hi, the vehicle operates normally.
If the driver attempts to switch the transfer case into any other mode, the transfer case makes noise as it shifts, the service 4x4 light comes on and the newly selected mode indicator light starts to flash.

2000-jimmy-turn-4-bqqpoqfgk1hfvr1c2liydaq2-3-2.jpg The TCCM is mounted behind the passenger side kick panel cover. It should be removed but left connected. Pin F4 should be monitored with either a lamp or meter. This pin should be high or 12 volts when in 2 wheel drive, and low or ground when in 4 wheel drive.
A quick test of the system is to ground the F4 pin, recycle the ignition, and try shifting the transfer case into and out of 4 wheel drive. ( I used a lamp based test light to be safe. Do not an LED based one.) If the mode indicator light remains steady and the Service 4X4 does not light, proceed with this repair procedure. If this does not resolve the issue, please proceed to troubleshoot the front vacuum system, 4X4 solenoid, 4X4 actuator, front axle, or front axle indicator switch.

If this test appears to resolve the issue, you will need to remove the TCCM module from the vehicle. Bend the 8 tabs away from the back cover. Remove the top cover, unscrew the board from the back cover / plate. turn over the board at a static safe work station, and measure the indicated 10,000 ohm SMD resistor. In this module, the resistor is required to operate near it's limits, and I believe that the conformal coating trapped heat and caused the resistor to fail. You can check other resistors nearby for a relative comparison. If found to be open, the resistor can be replaced with a higher power value 10,000 ohm SMD resistor, or a conventional 10,000 ohm resistor with wired leads.

The TCCM should be checked for corrosion on the connectors and cleaned if nessacary. The module can then be restored to the vehicle, and your 4X4 should work normally.

Please respond if this procedure helps you.

2000-jimmy-turn-4-bqqpoqfgk1hfvr1c2liydaq2-3-5.png Front view / pin side
f16f1 Connector Part Information1205210716 Way F Micro-Pack 100 Series (ORN) Pin Wire Color Circuit No. Function
E1 Tan 1569 Transfer Case Lock Soleniod Output
E2 - - Not Used
E3 PNK 1561 AWD/4WD Indicator Lamp Output
E4 Lt GRN/BLK 1563 2 HI Indicator Lamp Output
E5 BRN/WHT 1555 Transfer Case Position Switch Encoder Signal
E6 RED/WHT 1556 Transfer Case Position Switch Encoder Signal
E7 YEL/BLK 1558 Transfer Case Position Switch Encoder Signal
E8 DK BLU/WHT 1557 Transfer Case Position Switch Encoder Signal
E9 DK GRN/WHT 1133 Class 2 Serial Data Signal
E10 BRN 241 Fuse Output - Ignition 3 - Type III Fuse
E11 PPL 806 Fuse Output - Crank - Type III Fuse
E12 YEL 400 Vehicle Speed Sensor Signal
E13 PPL 401 Vehicle Speed Sensor Return
E14 BLK/WHT 1695 Four Wheel Drive Front Wheel Lock Telltale
E15 - - Not Used
E16 BLK/WHT 451 Engine Control Module Ground
F1 PPL/WHT 1565 4 LO Indicator Lamp Output
F2 TAN/BLK 1566 4 HI Indicator Lamp Output
F3 BRN 1560 Neutral Indicator Lamp Output
F4 GRA/BLK 1570 Front Axle Actuator Output
F5 LT BLU 2221 Vehicle Speed Sensor Signal
F6 DK GRN 2222 Vehicle Speed Sensor Return
F7 GRA/BLK 1694 Four Wheel Drive Switch Signal - Low
F8 - F11 - - Not Used
F12 BLK/WHT 1554 Transfer Case Encoder Signal Return
F13 LT GRN/BLK 431 Reference Voltage Feed - 8 Volt Reference
F14 LT GRN/BLK 431 Reference Voltage Feed - 8 Volt Reference
F15 - - Not Used
F16 LT BLU 1693 Four Wheel Drive Switch Signal
2000-jimmy-turn-4-bqqpoqfgk1hfvr1c2liydaq2-3-9.png Front view / pin side

Connector Part Information120528564 Way F Metri-Pack 280 Series (BLK) Pin Wire Color Circuit No. Function
A BLK 1552 Transfer Case Motor Feed - Clockwise
B RED 1553 Transfer Case Motor Feed - Counterclockwise
C BLK 1050 Ground
D ORG 1640 Fuse Output - Battery - Type III Fuse
2000-jimmy-turn-4-bqqpoqfgk1hfvr1c2liydaq2-3-14.jpg

2000-jimmy-turn-4-bqqpoqfgk1hfvr1c2liydaq2-3-20.jpg

2000-jimmy-turn-4-bqqpoqfgk1hfvr1c2liydaq2-3-27.jpg

Jan 28, 2011 | 2000 GMC Jimmy

1 Answer

4x4 not working on my 2002 chevy blazer ls 4.3l replaced the in dash switch and the tcm and the encoder motor what eles can be the issue when it went out it clicked when i switched into 4x4 then down the...


Is the switch lit up , light flashing ? Did you have the system checked for DTC'S - diagnostic trouble codes . Should have had this done before replacing parts . TCM ? your replaced the transmission control module ? Or the transfer case shift control module ? If no codes ,check B+ power and grounds for the control module . Find a wiring diagram so you know which wires are what etc.....Videos on youtube on basic automotive electrical testing , testing inputs an outputs for control modules . This system can set a number of codes !
DTC B2725
DTC C0300
DTC C0305
DTC C0308
DTC C0309
DTC C0310
DTC C0315
DTC C0323
DTC C0324
DTC C0327
DTC C0362
DTC C0367
DTC C0374
DTC C0376
DTC C0387
DTC C0550
DTC C0611

The front axle control circuit consists of a Front Drive Axle Clutch Solenoid which is electronically controlled by the transfer case shift control module. This solenoid opens and closes a vacuum control valve allowing vacuum to apply and release a clutch pack inside the front axle housing. The transfer case shift control module determines whether or not the clutch pack has been applied or released based on a signal from the front axle switch mounted on the front axle housing assembly. The front axle is normally locked or engaged during AUTO 4WD, 4WD HI, and 4WD LO modes. The front axle is unlocked or disengaged only during 2 HI or neutral modes.

The NVG 236/246 transfer case features a 4 button shift control switch located on the instrument panel. When the vehicle has the ignition key in the RUN position, the transfer case shift control module starts monitoring the transfer case shift control switch to determine if the driver desires a new mode/gear position. At a single press of the transfer case shift control switch, the lamp of the new desired position will begin flashing to inform the driver that the transfer case shift control module has received the request for a new mode/gear position. The lamp will continue to flash until all shifting criteria has been met and the new mode/gear position has been reached, or has been engaged. Once the new mode/gear position is fully active, the switch indicator lamp for the new position will remain ON constantly.

The NVG 233 transfer case features a 3 button shift control switch, located on the instrument panel. When the ignition is in the RUN position, the transfer case shift control module starts monitoring the transfer case shift control switch, to determine if a new mode/gear position has been selected. At a single press of the transfer case shift control switch, the lamp of the new position begins flashing to inform the driver that the transfer case shift control module has received the request for a new mode/gear position. The lamp continues to flash until all shifting criteria has been met and the new mode/gear position has been reached, or has engaged. Once the new mode/gear position is fully active, the switch indicator lamp for the new position remains ON constantly.

Which 4X4 system does your's have ? Three or four button ?

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Jul 04, 2017 | 2002 Chevrolet Blazer

1 Answer

99 Chevy Silverado 4x4 not working No light on 4x4 Selector Panel


Your brake an CV joint issue can't an won't cause your 4X4 problem . The 4x4 system has a control module which supply's B+ voltage to the switch . Checking for codes in the 4X4 control module should have been the first step . Your best bet , take it to a qualified repair shop . You don't have the knowledge or test equipment to fix this.
SERVICE indicator (4WD/AWD) Lamp
The SERVICE indicator (4WD/AWD) lamp is an integral part of the cluster and cannot be serviced separately. This lamp is used to inform the driver of the vehicle of malfunctions within the automatic transfer case (ATC) system. The SERVICE indicator (4WD/AWD) lamp is controlled by the transfer case shift control module via CKT 1567.

Transfer Case Shift Control Module
The transfer case shift control module uses the VIN information for calculations that are required for the different calibrations used based on axle ratio, transmission, tire size, and engine. The system does not know which calibration to use without this information.
The direct battery supply line (CKT 1640) provides the power to the module and motor circuitry.
Transfer Case Encoder Motor
The transfer case encoder motor consists of a permanent magnet (PM) DC motor and gear reduction assembly. It is located on the left hand side (drivers side) of the transfer case. When activated it turns the sector shaft of the transfer case (clockwise or counter clockwise) to shift the transfer case. The encoder motor is controlled with a pulse width modulated (PWM) circuit within the transfer case shift control module. This circuit consists of a driver on both the Motor A and Motor B circuits. The encoder motor is bi-directional to allow the motor to shift the transfer case from 2HI or 4HI to NEUTRAL and 4LO positions.
Do you know what DTC'S are ?
DTC B2725 ATC Mode Switch Circuit Malfunction
DTC C0300 Rear Speed Sensor Malfunction
DTC C0305 Front Speed Sensor Malfunction
DTC C0308 Motor A/B Circuit Low
DTC C0309 Motor A/B Circuit High
DTC C0310 Motor A/B Circuit Open
DTC C0315 Motor Ground Circuit Open
DTC C0323 T-Case Lock Circuit Low
DTC C0324 T-Case Lock Circuit High
DTC C0327 Encoder Circuit Malfunction
DTC C0367 Front Axle Control Circuit High
DTC C0374 General System Malfunction
DTC C0376 Front/Rear Shaft Speed Mismatch
DTC C0387 Unable to Perform Shift
DTC C0550 ECU Malfunction
DTC C0611 VIN Information Error

Aug 27, 2017 | 1999 Chevrolet Silverado 1500

2 Answers

Name of the 4x4 computer module


It is called the transfer case control module, a dealer only part.

Feb 20, 2009 | 1994 Chevrolet S-10 Blazer

1 Answer

Ford 2005 4x4 problem.


2-Speed Torque-On-Demand (TOD) Operation
The automatic 4-wheel drive (A4WD) system is a 2-speed torque-on-demand (TOD) operation that utilizes the following components:
  • Transfer case
  • 4-wheel drive (4WD) control module (integral to the powertrain control module [PCM])
  • Mode select switch (MSS)
  • Gearmotor encoder assembly (part of the transfer case shift motor)
  • Transfer case shift motor
  • Shift motor sense plate (part of the gearmotor encoder assembly)
Principles of Operation
Transfer Case Shift Motor The externally mounted transfer case shift motor, located at the rear of the transfer case, turns the shift cam assembly. As the shift cam assembly turns, it positions the reduction shift fork for desired transfer case operation. An integral position sensor in the shift motor provides shift motor position information to the 4WD control module.
Mode Select Switch (MSS) The push button MSS, mounted on the instrument panel, allows the operator to select the 4x4 Auto, 4x4 High, and 4x4 Low transfer case operating modes. The indicator light, on the instrument cluster push button, will illuminate only when the 4x4 Low position is engaged.
Visual Inspection Chart Mechanical Electrical
  • Axle shafts and CV joints
  • Driveshaft and universal joints
  • Fluid leaks
  • Matching tire sizes
  • Transfer case shift motor
  • Battery junction box (BJB) fuses:
    • 8 (30A)
    • 17 (5A)
    • 18 (20A)
  • Central junction box (CJB) fuses:
    • 12 (5A)
    • 24 (15A)
  • 4x4 module (PCM)
  • Wiring harness
  • Gearmotor encoder contact plate
  • Connector(s)
  • Circuitry
  • Mode indication switch (MSS)

  1. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
  1. If the concern is not visually evident, connect the diagnostic tool to the data link connector and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:
    • check that the program card is correctly installed.
    • check the connections to the vehicle.
    • check the ignition switch position.
  1. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool operating manual.
  1. Carry out the diagnostic tool data link test. If the diagnostic tool responds with:
    • CAN circuit fault; all electronic control units no response/not equipped, refer to Section 418-00 .
    • No response/not equipped for 4WD module (PCM), Go To Pinpoint Test G .
    • System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out the 4WD module (PCM) self test.
  1. If the DTCs retrieved are related to the concern, go to the 4WD Control Module (PCM) Diagnostic Trouble Code (DTC) Index to continue diagnostics. 4WD Control Module (PCM) Diagnostic Trouble Code (DTC) Index
    DTC Description Source Action B1317 Battery Voltage HIGH 4WD Module (PCM) REFER to Section 414-00 . B1318 Battery Voltage LOW 4WD Module (PCM) REFER to Section 414-00 . B1319 Driver Door Ajar Circuit Failure 4WD Module (PCM) Go To Pinpoint Test M . B1322 Driver Door Ajar Circuit Short To Ground 4WD Module (PCM) Go To Pinpoint Test M . B1342 ECU is Defective 4WD Module (PCM) CLEAR the DTCs. REPEAT the 4x4 module (PCM) self test. If DTC B1342 is retrieved, INSTALL a new 4x4 module (PCM). REFER to Section 303-14 . CLEAR the DTCs. REPEAT the self test. B1483 Brake Pedal Input Circuit Failure 4WD Module (PCM) Go To Pinpoint Test M . B1485 Brake Pedal Input Short to Battery 4WD Module (PCM) Go To Pinpoint Test M . C1729 Transfer Case Unable to Transition Between 4H and 4L 4WD Module (PCM) Go To Pinpoint Test K . C1970 4WD Low Mode Switch LED Short to Battery 4WD Module (PCM) Go To Pinpoint Test K . C1971 4WD Low Mode Switch LED Circuit Failure 4WD Module (PCM) Go To Pinpoint Test K . P1707 Transfer Case NEUTRAL or PARK/NEUTRAL Indication Circuit 4WD Module (PCM) Go To Pinpoint Test M . P1812 Transmission 4-Wheel Drive Mode Select Circuit Failure 4WD Module (PCM) Go To Pinpoint Test K . P1815 Transmission 4-Wheel Drive Mode Select Short Circuit to Ground 4WD Module (PCM) Go To Pinpoint Test K . P1816 Transmission NEUTRAL Safety Switch Circuit Failure 4WD Module (PCM) Go To Pinpoint Test M . P1819 Transmission NEUTRAL Safety Switch Circuit Short to Ground 4WD Module (PCM) Go To Pinpoint Test M . P1820 Transfer Case Clockwise Shift Relay Coil Circuit Failure 4WD Module (PCM) Go To Pinpoint Test K . P1822 Transfer Case Clockwise Shift Relay Coil Circuit Short To Battery 4WD Module (PCM) Go To Pinpoint Test K . P1824 4-Wheel Drive Clutch Relay Circuit Failure 4WD Module (PCM) Go To Pinpoint Test H . P1826 4-Wheel Drive Low Clutch Relay Short Circuit to Battery 4WD Module (PCM) Go To Pinpoint Test H . P1827 4-Wheel Drive Low Clutch Relay Short Circuit to Ground 4WD Module (PCM) Go To Pinpoint Test H . P1828 Transfer Case Counterclockwise Shift Relay Coil Circuit Failure 4WD Module (PCM) Go To Pinpoint Test K . P1830 Transfer Case Counterclockwise Shift Relay Coil Circuit Short To Battery 4WD Module (PCM) Go To Pinpoint Test K . P1849 Transfer Case Contact Plate A Short Circuit to Ground 4WD Module (PCM) Go To Pinpoint Test K . P1853 Transfer Case Contact Plate B Short Circuit to Ground 4WD Module (PCM) Go To Pinpoint Test K . P1857 Transfer Case Contact Plate C Short Circuit to Ground 4WD Module (PCM) Go To Pinpoint Test K . P1861 Transfer Case Contact Plate D Short Circuit to Ground 4WD Module (PCM) Go To Pinpoint Test K . P1867 Transfer Case Contact Plate General Circuit Failure 4WD Module (PCM) Go To Pinpoint Test K . P1891 Transfer Case Contact Plate Ground Return Open Circuit 4WD Module (PCM) Go To Pinpoint Test K . U1900 CAN Communication BUS Fault 4WD Module (PCM) REFER to Section 418-00 . U2023 External Node Fault 4WD Module (PCM) REFER to Section 418-00 . U2051 One Or More Calibration Files Missing/Corrupt 4WD Module (PCM) Reprogram/Reflash the 4x4 module. REFER to Section 418-00 . - For All Other DTCs 4WD Module (PCM) REFER to Section 418-00 .
  2. Your best bet mite be to take it to a qualified repair shop !

May 30, 2017 | 2005 Ford Explorer

2 Answers

I have a 97 chevy tahoe and the 4x4 wont lock in i just replaced the actuator and it just blinks on 4x4 . i do have 12 volts @ the harness to????


Your transfer case could be locked up. Try pulling the shifter motor (servo) off of the transfer case and manually shifting the vehicle into 4x4. Make sure to block the wheels as it will roll if you shift into neutral. If you cant shift it, you need to have a professional look at the insides of your transfer case.

Dec 22, 2008 | 1997 GMC Jimmy

2 Answers

1996 chevy K1500 transfer case slipping out of 4 wheel drive


Your trouble is most likely not in the transfer case but in the front differential engagement solenoid.

Dec 20, 2008 | 1996 Chevrolet K1500

1 Answer

1996 Yukon 4X4 Electronic Shift on Fly.


I had the same problem with the shift on the fly push-button 4x4 on my 97 Suburban. GM Shop manual indicates that it could be due to an encoder error on the actuator motor. Try pulling the transfer case fuse to reset the transfer case control module. Wait at least one minute. Re-install fuse then re-try operation. Did it last week and that saved me a trip to the dealership and extensive troubleshooting.

Nov 15, 2008 | 1999 GMC Sierra

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