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I need a diagram that describes the front differential actuator connecotr pins and the Transfer case control module(tccm) pin out

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  • GMC Master
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Sorry we do not have these diagrams available.

Posted on Jan 01, 2014

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6ya6ya
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Posted on Jan 02, 2017

Benimur
  • 6966 Answers

SOURCE: electrical diagram

Hi,

Might this help?

They were originally posted here and here.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Posted on Aug 16, 2008

robshow
  • 367 Answers

SOURCE: kia optima 2004 transmission selector wiring colour diagram

Try this website www.kiatechinfo.com

This will be far more usefull than me just handing you the diagram

Posted on Jan 19, 2009

  • 7 Answers

SOURCE: Wiring diagram

If you are going from a 4 pin on your trailer to the 7 pin on the truck. You need to go to parts store or a department store (ex Wal Mart) and look in trailer section and find the adapter. Thats what I did. Also Remember if your lights don't work on trailer, check the plug to make sure its tight or check the fuse under your drivers side rear seat for that fuse box.

Posted on May 17, 2009

  • 94 Answers

SOURCE: Please help me i need the Lighting Control Module diagram

http://i28.photobucket.com/albums/c216/thomaspedemon/99lcm1of3.gif

http://i28.photobucket.com/albums/c216/thomaspedemon/99lcm2of3.gif

http://i28.photobucket.com/albums/c216/thomaspedemon/99lcm3of3.gif

follow the three links for complete wiring diagram of lcm

Posted on Jun 30, 2009

cincinaty5
  • 132 Answers

SOURCE: 1993 chevy 1500 4x4 pickup no power to front actuator

check all wire conections also replace the actuator on the front axle but check for power there first if you have power replace that switch as well .

Posted on Aug 27, 2009

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Stuck in 4 wheel Drive High but no lights are lit


Hi Jimi , There are very specific diagnostic procedures to follow for diagnosing this system. First a good visual inspection of the transfer case an fluid level an wiring connections. The transfer case shift control module is equipped with the ability to store diagnostic information, which is useful to a technician in the event of module, component or wiring failures. This information can be retrieved from the transfer case shift control module by way of flash codes, which are displayed on the three transfer case shift control switch buttons. These buttons are located on the instrument panel to the right of the steering wheel Before obtaining DTCs, perform the following transfer case control module (TCCM) Self-Test.
TCCM Self-Test
  1. Observe the transfer case shift control switch indicators while turning the ignition switch to RUN. A properly operating system will flash all indicators and then will return to the current gear. If the system is operating normally, then proceed to Displaying Codes.
  2. If the TCCM failed the Self-Test, then test the following circuits.
  3. ?€¢
    Battery Positive Voltage (40 and 1640), and Ignition 3 Voltage for battery voltage


    ?€¢
    Ground Circuit for ground


    ?€¢
    Diagnostic enable circuit for an open or high resistance


    ?€¢
    Transfer case shift control switch connector

  4. If the above circuits are normal but the TCCM still fails the Self-Test, replace the TCCM. Refer to Transfer Case Shift Control Module Replacement .
DTC Displaying
  1. Turn OFF the ignition for 10 seconds.
  2. Connect PIN 13 on the data link cable (DLC) to a ground. The DLC is located in the cab under the instrument panel on the driver's side.
  3. Turn ON the ignition, with the engine OFF.
  4. Observe the transfer case shift control switch select buttons for flashing codes. Refer to Diagnostic Trouble Code (DTC) List .
Important: If the transfer case shift control switch buttons all blink only once and then stop, no fault codes are stored in the transfer case shift control module.
?€¢
When one DTC is stored in memory, that code will blink that number of times followed by a 3 second pause and then repeat.


?€¢
If more than one code is stored, the first code will blink, followed by a 3 second pause and then the second code will blink.


?€¢
This sequence will continue until PIN 13 on the DLC is no longer grounded.


?€¢
If the TCCM will not communicate the presence or absence of DTCs, test the above circuits in Self-Test Step 2. If the circuits are complete, then replace the TCCM. Refer to Transfer Case Shift Control Module Replacement .


Let me know if you have any codes , I have code definitions an procedures.

Feb 04, 2015 | 2003 GMC Sonoma Extended Cab

1 Answer

I have a 1998 Chevy Tahoe I tryed to put my truck is 4wd low and it tryed and keep on blinking and went back to 2wd and blow a fuse and I tryed again and did it again but then the the service 4wd light...


Which 4X4 system does your tahoe have ?
Transfer Case System Description (Selectable 4WD)
The New Venture Gear Model NV243 is an electronically controlled optional transfer case for use on four wheel drive K trucks. The driver selects 2HI, 4HI, or 4LO by pushing one of three illuminating shift select buttons mounted on the instrument panel. The shift select buttons display the transfer case mode and range, self-test, diagnostic trouble codes, and electronic shift mechanical engaging problems.

Transfer Case System Description (Automatic 4WD)
The two speed Auto transfer case system utilizes a part time front axle. The system allows the driver to select the transfer case position with a touch of a button. The following positions can be selected: 4-wheel drive high range (4H), All Wheel Drive (AUTO), 2 Wheel Drive high range (2H), Neutral (N), and 4-Wheel Drive low range (4L).
The Auto Transfer Case (ATC) Control Module controls all the shifting action of the transfer case based on input from the driver as well as information from the Vehicle Control Module (VCM) /Powertrain Control Module (PCM).
4WD (4H or 4L) mode: This is accomplished by engaging the front axle, applying PWM to an electric motor to apply maximum torque, (fully compressing the transfer case clutch plates) to the front axle, then removing the ground on circuit 1569, thus locking the motor in position and stop the PWM to the motor.
AUTO mode: When in this mode of operation, the system should engage the front axle, then it monitors the front and rear propshaft speeds for any speed differences. When the system senses rear wheel slip, a difference of propshaft speed between front and rear, the Auto Transfer Case (ATC) Control Module will use pulse width modulation (PWM) to drive an electric motor. This motor transfers only the required torque to the front wheels to gain additional traction on slippery surfaces up to 75 mph. There is no torque applied to the front wheels until the module senses rear wheel slip.
Throttle anticipation (only operational when in AUTO mode): If the vehicle is below 5 mph and the accelerator is pressed quickly beyond a set point, the system will automatically transfer a percentage of torque to the front wheels to help prevent the rear wheels from slipping, as in a hard acceleration from a stopped position.
The Auto Transfer Case (ATC) Control Module also has the capability of engaging the front axle while the vehicle is in motion. It does this by applying PWM to the electric motor to apply torque to the front axle, this action is used to match the speed of the front and rear propshafts. After the module senses the proper speed, it then supplies a ground on circuit 1570 to engage the front axle.
The Auto Transfer Case (ATC) Control Module will accept a mode shift only when the engine is running and a valid Motor/Encoder signal is present. A mode shift is any shift between 2H, 4H, and AUTO.
The Auto Transfer Case (ATC) Control Module will permit a range shift only if the following conditions are met within 30 seconds of the request:

Automatic 4WD Diagnostic Aids
A Scan Tool reads and displays the following information:
• Diagnostic Trouble code(s)
• Code status bit (are codes set or not)
• Transfer case lock status
• Lamp in the switch/lamp assembly
• Motor/Encoder gear position
• Ignition (3) voltage
• Front propshaft speed sensor (KPH)
• Front axle switch (open/closed)
• Front axle requested position (engaged/disengaged)
• Rear propshaft speed sensor (KPH)
• Mode switch position request
• Park switch (open/closed)
• 4WD (Adapt) Mode Auto bit
• Current Mode corrective action PWM
• Average and highest PWM applied during last slip recovery event
• Throttle anticipation mode
• Average and highest PWM applied during last Throttle anticipation corrective action event
• Difference between front and rear propshaft RPM
• Adapt event counter
• Throttle position sensor percentage

Check the transfer case shift control module for DTC's. The transfer case shift control module is not a class 2 device. DTC's are displayed on the transfer case shift control switch. Refer to Diagnostic Trouble Code (DTC) Displaying .
Are any DTC's present?
Diagnostic Trouble Code (DTC) Displaying
The transfer case shift control module is equipped with the ability to store diagnostic information, which is useful to a technician in the event of module, component or wiring failures. This information can be retrieved from the transfer case shift control module by way of flash codes, which are displayed on the three transfer case shift control switch buttons. These buttons are located on the instrument panel to the right of the steering wheel Before obtaining DTCs, perform the following transfer case control module (TCCM) Self-Test.
TCCM Self-Test
Observe the transfer case shift control switch indicators while turning the ignition switch to RUN. A properly operating system will flash all indicators and then will return to the current gear. If the system is operating normally, then proceed to Displaying Codes.
If the TCCM failed the Self-Test, then test the following circuits.
• Battery Positive Voltage (40 and 1640), and Ignition 3 Voltage for battery voltage
• Ground Circuit for ground
• Diagnostic enable circuit for an open or high resistance
• Transfer case shift control switch connector
If the above circuits are normal but the TCCM still fails the Self-Test, replace the TCCM. Refer to Transfer Case Shift Control Module Replacement .
DTC Displaying
Turn OFF the ignition for 10 seconds.
Connect PIN 13 on the data link cable (DLC) to a ground. The DLC is located in the cab under the instrument panel on the driver's side.
Turn ON the ignition, with the engine OFF.
Observe the transfer case shift control switch select buttons for flashing codes. Refer to Diagnostic Trouble Code (DTC) List .
Important: If the transfer case shift control switch buttons all blink only once and then stop, no fault codes are stored in the transfer case shift control module.
• When one DTC is stored in memory, that code will blink that number of times followed by a 3 second pause and then repeat.
• If more than one code is stored, the first code will blink, followed by a 3 second pause and then the second code will blink.
• This sequence will continue until PIN 13 on the DLC is no longer grounded.
• If the TCCM will not communicate the presence or absence of DTCs, test the above circuits in Self-Test Step 2. If the circuits are complete, then replace the TCCM. Refer to Transfer Case Shift Control Module Replacement .

Apr 15, 2017 | Cars & Trucks

2 Answers

I am experiencing grinding in the front differential on my 2003 s10 4x4. It occurs shortly after engaging the 4x4, but only once in awhile. The diff does not make any noise at all when working properly. ...


It's either a vacum shift actuator, Rusty actuator cable, weak spring in side of the differential shift mechanism, TCCM (control module), switch, or vacum switch on transfer case ( start there). But all told, $980.00 in parts and $1200 in labor. Now take a deep breath as you call the tow truck to tow it to the junk yard.

Feb 09, 2011 | 2003 Chevrolet S-10

1 Answer

The Smart Trac AWD is not turning the front wheels. Had it check by mechanic and the drivetrain is spinning but not engaging the front axles. Accuator? or other ideas?


Did you change your transfer case fluid every 50K miles? Very important requirement in the Owner's Manual. And how are the TC and differential fluid levels today? If all this its ok, them sound like the AWD vehicles like yours will need a dealer reprogram if the TCCM came off a 4WD vehicle.

Keep in mind that the part-time 4WD systems like I have (with 4LO as an option in the transfer case) have a front axle disconnect actuator plus the transfer case. But full-time AWD systems like you have use the transfer case only to send or not send torque to the front axle. You don't have a front axle actuator.

If the technician was using the tech tool to talk to the transfer case (not the front axle), then the TC (Transfer Case) could have an internal problem, or the Transfer Case encoder motor could have a problem, or the Control Module. You should definitely try spinning the front driveshaft by hand and see if the front wheels move.

Keep us updated.

Feb 03, 2011 | 2002 Oldsmobile Bravada

1 Answer

04 Trailblazer LS won't go into 4WD. Front hubs don't engage with switch in cab. It will gear down to 4wd Lo but front wheels won't engage. Please help. Can't afford the dealer!


What do the lights on the 4x4 selector switch do when you switch to A4WD or $HI or 4LO positions? Do they blink and revert to previous selection? Has the Transfer Case fluid been changed at 50K intervals?
There are actuators on the Transfer Case and Front Differential that control the application of power to the front wheels. These actuators are controlled by the TCCM (Transfer Case Control Module). It takes a qualified 4 wheel drive technician to diagnose these systems.

Jan 09, 2011 | 2005 Chevrolet TrailBlazer

3 Answers

My 2000 gmc jimmy 4x4 stoped working. It wont go into 4 hi. the vacume pump under the battery is good. can hear and feel the motor switch from 4 low to 2 hi. any ideas? Is there a code reader for this...


Hi, it sounds like your front diff engages but your transfer case is not. raise one of your front tires off the ground and see if it will lock up when you go to 4hi. If it does then the problem is your encoder motor that hangs down under your transfer case.

Aug 21, 2010 | 2000 GMC Jimmy

1 Answer

4x4 push button is not working about how much does


This is something you can do yourself if you have ever worked on a vehicle before. The part you need is called a front drive actuator valve. It costs about $ 50.00, GM part # 15165891.
Here is some more infor about it:

Main 4wd Components:
TCCM
- Transfer Case Control Module - Located behind the glove box. This is the electronic 'brains' behind the shifting.
Switch - The push button switch in the dash - driver input/indicator.
Encoder Motor - Located on the transfer case - This is what actually shifts the transfer case, and tells the TCCM what position it is in.
Vacuum Switch - Also located on the transfer case - This is what sends vacuum to the vacuum actuator (see below) when the transfer care is in 4HI or 4LO.
Vacuum Actuator - Located under the battery tray - This is what engages or disengages the front driveshaft.
Front Axle Switch - Located on the front axle - This is what tells the TCCM when the front axle is engaged.

If you want to try and replace it yourself, please let me know how it goes.

Feb 11, 2010 | 1998 GMC Jimmy

2 Answers

Four wheel drive will not engage when truck is warmed up.sometimes it will engage usually when truck is cold????


On the full size, the front actuator is electric, not vacuum.

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.

88-UP C/K ACTUATOR UPGRADE
VEHICLE SERVICED: 1994 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

Jan 10, 2010 | 1999 Chevrolet K1500

1 Answer

2004 silverado 4 wheel drive does not work, 4 wheel high button remains lit, will not change to any other button


1. Inspect Transfer Case Control Module (TCCM) and encoder/motor wiring, terminal contact, grounds.

2. Install updated TCCM calibration.

3. Inspect for TCCM water intrusion.
4. Replace transfer case encoder/motor. 1. Check voltage on pin A, Light Blue wire at the engage switch.

2. The voltage should remain near 1.0v with no buttons pushed, compare to the value on the scanner when the problem happens.

3. Back close to the switch by hand and check for a glitch.

4. Wiggle tug test harnesses at the switch and TCCM.

5. Check terminal to pin grip. could be your transfercase control module locater under drivers side of dash. or the encoder motor

Oct 23, 2009 | 2004 Chevrolet Silverado 1500 Crew Cab

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