K 2500 Suburban 4WD V8-5.7L VIN R (1999)
Vehicle Control Module: Service and Repair
VCM Replacement/Programming
NOTE: In order to prevent possible electrostatic discharge (ESD) damage to the VCM, do not touch the connector pins or soldered components on the
circuit board.
IMPORTANT:
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Service of the VCM consists of either replacement of the VCM or reprogramming of the VCM.
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If the VCM is being replaced the Knock Sensor (KS) module must be transferred to the replacement VCM.
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The replacement VCM must be programmed before the vehicle will run.
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The replacement VCM must have the Passlock Reprogramming procedure performed before the vehicle will run.
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The replacement VCM must have the CKP System Variation Learn procedure performed or a DTC P1336 will set.
A shorted solenoid, relay coil, or harness will not damage the output driver module (ODM) in the VCM. A shorted solenoid, relay coil, or harness will
cause the circuit and the controlled component to be inoperative.
When the circuit fault is not present or the technician has repaired the fault, the output driver module (ODM) will again operate in a normal manner due
to its fault protected design.
Removal Procedure
CAUTION: Refer to Battery Disconnect Caution in Cautions and Notices
1. Disconnect the negative battery cable.
NOTE: Refer to Electrostatic Damage and the VCM Notice in Cautions and Notices.
2. Remove the VCM retainer clip.
3. Remove the VCM from the VCM bracket.
