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2009 chevy Silverado code CO321 transfer lock circuit failed

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DTC C0321 01: Transfer Case Lock Circuit Short to Battery
DTC C0321 02: Transfer Case Lock Circuit Short to Ground
DTC C0321 04: Transfer Case Lock Circuit Open
DTC C0321 08: Transfer Case Lock Circuit Signal Invalid

The transfer case shift control module controls the transfer case lock solenoid.
The transfer case lock solenoid is released by being energized. This is accomplished by grounding the lock solenoid control circuit during gears shifts, and in the AUTO 4WD mode. Locking action is applied when power or ground are taken away from the lock solenoid, the transfer case motor is prevented from moving. The system is capable of providing a 2HI, 4HI and 4LO lock-up without the need of additional vehicle power to hold the transfer case in these positions.
This DTC detects an open lock solenoid coil, open motor lock control circuit, or an open batter positive voltage circuit, or a short to voltage or ground on the lock solenoid control circuit.


Circuit/System Testing
The battery positive voltage circuit and the lock solenoid control circuit must be tested for opens, shorts to ground, shorts to voltage, and high resistance. This can also result from a electrically faulted solenoid.
With the ignition on check which DTC is set. If DTC C0321 is set with failure type byte 04 then do the following.
? The transfer case lock is unable to hold during a hold test and the transfer case actuator will need to be replaced, and the motor learn procedure performed. If this is not the case continue to the next step.
Disconnect the transfer case actuator, turn on the ignition and with a DMM check the battery positive voltage circuit for battery voltage at the transfer case actuator.
? If battery voltage is not seen then repair the battery positive voltage circuit for an open or high resistance. If the circuit checks out proceed to the next step.
Disconnect the transfer case control module connector X2 and check the circuit for an open, high resistance, short to ground, or short to voltage. If condition is found repair the circuit or inline connector 109 as necessary, if the condition is not found refer to component testing.

Posted on May 18, 2018

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Posted on Jan 02, 2017

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jturcotte

Jeffrey Turcotte

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SOURCE: Im trying to find a

Do these match the color you have there?
2009 Chevrolet Silverado C1500 Car Stereo Wire Schematic
Car Radio Battery Constant 12v+ Wire: Red/White
Car Radio Accessory Switched 12v+ Wire: Dark Green
Car Radio Ground Wire: Black
Car Radio Illumination Wire: N/A
Car Stereo Dimmer Wire: Yellow
Car Stereo Power Antenna Trigger Wire: N/A
Car Stereo Amp Turn-On Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Tweeter Size: 1? Tweetersir?t=modilife-20&l=as2&o=1&a=b00009uhre
Car Audio Front Tweeter Depth: 1?
Car Audio Front Tweeter Location: N/A
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Car Audio Front Speakers Size: 6 1/2? Speakersir?t=modilife-20&l=as2&o=1&a=b00009uhre
Car Audio Front Speakers Depth: 4?
Car Audio Front Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue
Right Rear Speaker Negative Wire (-): Light Blue
Car Audio Rear Speakers Size: 4? x 6? Speakersir?t=modilife-20&l=as2&o=1&a=b00009uhre
Car Audio Rear Speakers Depth: 2 1/2?
Car Audio Rear Speakers Location: N/A
Car Subwoofer Speaker Size: N/A
Car Subwoofer Speaker Depth: N/A
Car Subwoofer Speaker Location: N/A
Car Subwoofer Speaker Positive Wire (+): N/A
Car Subwoofer Speaker Negative Wire (-): N/A

Posted on Apr 06, 2011

Jeff Armer

  • 15575 Answers

SOURCE: Why would both passenger windows quit working on my 2009 Chevy Silverado extended cab, is there a fuse or circuit breaker I am unaware of

The DDS- (driver door switch) controls the passenger window through a GMLAN message to the PDS (passenger door switch). When a power window switch is activated in the up or down positions the PDS supplies power and ground to the window motor control circuits to drive the window motor in the required direction. Prior to activating a power window motor the PDS will supply the control circuit with a low current bias voltage in order to determine that a short to ground condition does not exist, and during window motor operation the PDS continues to monitor the motor current to verify proper window motor operation. (Scan tool support is available for this system .
There are two circuit breakers , one for the left side windows front an rear an one for the right side front an rear . If both front windows work it's not a fuse or circuit breaker problem ! The windows are controlled by the BCM - body control module > Watch this video on how to test computer controlled power windows .
T How to test computer controlled door locks

Posted on Apr 23, 2016

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2000 chevy siverado z71 4x4 not working


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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.

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