Question about 1998 Chevrolet Astro
After replacing the vcm,( did the passlock relearn procedure), The van ran as it should for about a week.... Now every time I turn the ignition key to the start position, to start the van, the horn blows. No codes, no security lights, just the horn and nothing else. Tried leaving the ignition in the run position, and cranking the motor,( bypassed the start relay). The engine tries to run but dies, ( the same as before the vcm replacement). My gm shop manuel doesn't even mention the passlock system.
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Posted on Jan 02, 2017
Tips for a great answer:
The ignition switch
The passlock sensor
The EVO/Passlock module
The security indicator
The vehicle/powertrain control module (VCM/PCM)
Nov 29, 2015 | Cars & Trucks
If the VCM is being replaced, the knock sensor (KS) module must be transferred to the replacement VCM.
The replacement VCM must be programmed before the vehicle will run.
The replacement VCM must have the Passlock Reprogramming procedure performed before the vehicle will run.
The replacement VCM must have the CKP System Variation Learn procedure performed or a DTC P1336 will set
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