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Vcm obd2 not communicating with computer - 1999 Chevrolet Blazer

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Check cig lighter fuse

Posted on Apr 22, 2013

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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Need to get 98 s10 2.2 to rset passlock . howcan i trick computer withturn signal switch, i seen it done once


No you didn't ! you only think you did . Turn signal switch has nothing to do with it .
Ignition Lock Cylinder and Housing
The ignition lock cylinder is located at the upper right side of the steering column. The Passlock™ sensor is in the steering column. The Passlock™ sensor is separate from the key and lock cylinder. The key and the lock cylinder work together in order to determine if the proper ignition key was used to start the vehicle.
In the event of an open Class 2 serial data line between the BCM and the VCM/PCM, the vehicle will become fail-enabled if the VCM/PCM has already received the password from the BCM for that ignition cycle (the engine is running). In this event, the following conditions occur:
• The security telltale will be ON continuously.
• The VCM/PCM will become fail-enabled for future ignition cycles.
If a failure in the Class 2 serial data line occurs before the ignition cycle, when the VCM/PCM is not fail-enabled, the following conditions occur:
• The VCM/PCM will never receive a valid password in order to enable the fuel injectors.
• The vehicle will not start.

The design of the passlock™ system is to prevent the vehicle operation if the proper ignition key is not used in order to start the vehicle. The mechanical key, in normal operation, will turn the passlock™ lock cylinder. The passlock™ sensor will relay the passlock™ data to the body control module (BCM). The BCM will determine the validity of the passlock™ data. The BCM will send a code password to the vehicle/powertrain control module (VCM/PCM). When the VCM/PCM receives the correct code the VCM/PCM allows the fuel injectors to operate normally. The passlock™ system requires the VCM/PCM and the BCM to communicate the various functions in order to operate. These functions transmit over the class 2 serial data line CKT 1807. For an explanation of the class 2 serial data operation refer to Data Link Connector Circuit Description in Wiring Systems.
Your best bet , take it to a qualified repair shop , there is a real possibility of rendering your vehicle useless if you don't know what your doing

Nov 13, 2016 | 1998 Chevrolet S-10 Pickup

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How to program key to ignition for a 1998 Chevy truck w/vortex v6 engine..I tried it myself an it did crank but will not stay running


Program KEY ? There is no transponder in the key for a 1998 Chevy truck . What problem are you have ,no start ? Is the SECRUITY light lit on the dash ? you don't need to program keys with this ant-theft system .
Vehicle Theft Deterrent (VTD) Operation
The design of the passlock system is to prevent the vehicle operation if the proper ignition key is not used in order to start the vehicle. The mechanical key, in normal operation, will turn the passlock lock cylinder. The passlock sensor will relay the passlock data to theEVO/Passlock module. The EVO/Passlock module will determine the validity of the passlock data. The EVO/Passlock module will send a code password to the vehicle/powertrain control module (VCM/PCM). When the VCM/PCM receives the correct code the VCM/PCM allows the fuel injectors to operate normally. The passlock system requires the VCM and the EVO/Passlock module to communicate the various functions in order to operate. These functions transmit over the class 2 serial data line CKT 1807. For an explanation of the class 2 serial data operation refer to Data Link Communications Circuit Description in Wiring Systems.
Passlock System
The design of the passlock system is to prevent vehicle theft by disabling the engine unless the passlock lock cylinder rotates properly by engaging the correct ignition key. The system is similar in concept to the passkey system. However, the passlock eliminates the need for a key mounted resistor pellet. The components of the system are as follows:
?€¢
The ignition lock cylinder


?€¢
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

2 Answers

I PUT A DIFFERENT ENGINE COMPUTER IN MY 1999 GMC SAVANNA VAN 1500 SERIES. CHANGED OUT MONDALE. IT STILL WILL NOT EVEN APEMP TO START.


Important:
?€¢
Service of the vehicle control module (VCM) consists of either replacement of the VCM or reprogramming of the VCM.


?€¢
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

Oct 06, 2015 | GMC Cars & Trucks

2 Answers

Why won't my 2012 ford focus start?


Does it crank over and not start? If so you need to determine if there is fuel supply as well as spark to the spark plugs. Given the fact that the vehicle is fairly new, it shouldn't have problems with these systems so early. IS there a theft light on/flashing? High mileage?

Jun 14, 2015 | 2012 Ford Focus

1 Answer

Replaced stearing column on a 2000 Silverado now it won't start


Did you change the lock cylinder ? You need to put the passlock?"¢ sensor out of your old steering column into the replacement one. Is the security light lit in the instrument cluster ?
The design of the passlock?"¢ system is to prevent the vehicle operation if the proper ignition key is not used in order to start the vehicle. The mechanical key, in normal operation, will turn the ignition lock cylinder. The passlock?"¢ sensor monitoring the position of the lock cylinder will relay the passlock?"¢ data to the body control module (BCM). The BCM will determine the validity of the passlock?"¢ data. The BCM will send a password to the vehicle/powertrain control module (VCM/PCM). When the VCM/PCM receives the correct password the VCM/PCM allows the fuel injectors to operate normally. The passlock?"¢ system requires the VCM/PCM and the BCM to communicate the various functions in order to operate. These functions transmit over the class 2 serial data line CKT 1807. For an explanation of the class 2 serial data operation refer to Data Link Communications Circuit Description in Data Link Communications

May 09, 2015 | Cars & Trucks

1 Answer

2003 CLK 320 NO computer communication with tranny, air bags,brakes . why????


look for problem connections in the wiring harness ( loose ,not connected properly, corroded pins, water)

Mar 08, 2015 | Cars & Trucks

1 Answer

How do you replace the flasher on ford 500 2007


No flasher on your vehicle ! controlled by SJB
Principles of Operation
The smart junction box (SJB) sends multiple voltage reference signals to the multifunction switch. When the multifunction switch is in the LH or RH TURN positions, or the hazard lamp switch is engaged, that input signal is routed to ground.
When the SJB receives a request for a turn signal or hazard lamps, the SJB supplies voltage to the appropriate turn lamps.
  1. Verify the customer concern.
  1. Visually inspect the following for obvious signs of mechanical or electrical damage.


Visual Inspection Chart Mechanical Electrical
  • Multifunction switch
  • Hazard switch
  • Circuitry
  • Bulbs
  • Rear lamp assembly
  • Smart junction box (SJB)

  1. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
NOTE: Make sure the headlamp switch is in the OFF position.
NOTE: Make sure the multifunction switch is in the LOW BEAM position.
  1. NOTE: Make sure to use the latest scan tool software release.
    If the cause is not visually evident, connect the scan tool to the data link connector (DLC).
  1. NOTE: The vehicle communication module (VCM) LED prove-out confirms power and ground from the DLC are provided to the VCM.
    If the scan tool does not communicate with the VCM:
    • Check the VCM connection to the vehicle.
    • Check the scan tool connection to the VCM.
    • Refer to Section 418-00 , No Power to the Scan Tool, to diagnose no communication with the scan tool.
  1. If the scan tool does not communicate with the vehicle:
    • Verify the ignition key is in the ON position.
    • Verify the scan tool operation with a known good vehicle.
    • Refer to Section 418-00 to diagnose no response from the powertrain control module (PCM).
  1. Carry out the network test:
    • If the scan tool responds with no communication for one or more modules, refer to Section 418-00 .
    • If the network test passes, retrieve and record the continuous memory diagnostic trouble codes (DTCs).
  1. Clear the continuous DTCs and carry out the self-test diagnostics for the SJB.
  1. If the DTCs retrieved are related to the concern, go to the Smart Junction Box (SJB) Diagnostic Trouble Code (DTC) Index. For all other DTCs, refer to Section 419-10 .
  1. If no DTCs related to the concern are retrieved, GO to Symptom Chart .
Your best bet would be to take your vehicle to a qualified repair shop !

Aug 14, 2013 | 2007 Ford Five Hundred Limited Sedan

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