I have the same problem few days ago, and still didn't find any solution. Can any one please help?????
Does the security light flash or stay on steady ?
You have the same vehicle 2004 chevy colorado .
When turning the key to run does the instrument cluster light up - warning indicators . Turn the key to start an nothing happens ?
Anti-theft system problem ,maybe . These Colorado's are a puzzle ???? maybe to the guy below . I have thirty plus years as a chevy tech . Yes you vehicle has a few relays that power up the vehicle ,but are controlled by the BCM - body control module . By direct out put control from the BCM or by messages over serial data circuits,
On vehicles that have several control modules connected by serial data circuits, one module is the power mode master (PMM). On this vehicle the PMM is the body control module (BCM). The BCM uses 3 signals from the ignition switch. These are the Ignition Off/Run/Crank , Ignition 1 Run/Crank, and Ignition Accessory.
Circuit Description (BCM Controlled)
Moving the ignition to the START position signals the body control module (BCM) that engine crank has been requested. The BCM verifies that theft is not active and sends a serial data message to the powertrain control module (PCM) requesting engine start. The BCM also energizes the RUN/CRANK RELAY. When the RUN/CRANK RELAY switch side closes, and the vehicle is in Park or Neutral or with the clutch is fully depressed, if equipped, supplies voltage to the starter relay coil. The PCM verifies the transmission is in Park or Neutral and the clutch is fully depressed, if equipped. The PCM will then ground the control circuit of the starter relay, closing the switch supplying voltage to the starter solenoid. On some vehicles the starter will continue to crank the engine with the key released until it starts of the crank command has timed out to prevent excessive heat build up in the starter circuitry or the PCM receives an engine run flag.
or Could be PCM/ECM controlled
Circuit Description (ECM/PCM Controlled)
Moving the ignition switch to the START position sends a 12-volt signal to the engine control module (ECM)/powertrain control module (PCM) Crank Request circuit. The ECM/PCM verifies that the transmission is in the PARK or NEUTRAL position. With the transmission in Park, voltage flows through the Park/Neutral position switch and feeds the starter relay coil. The PCM then grounds the control circuit of the starter relay. When the starter relay is energized it allows battery positive voltage to the starter solenoid S terminal. On some vehicles the starter will continue to crank the engine with the key released until it starts or the crank command has timed out to prevent excessive heat build up in the starter circuitry or the ECM/PCM receives an engine run flag.
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Does the security light flash or stay on steady ?
These Colorado's are a puzzle, they have relays instead of a
computer, they have only two sizes of relays, on the inside of
the relay cover, they are listed as to where they are used. Exchange the starter relay with another the same size. Rotate
until you find witch is bad, It's best to use a new one, you can buy them on line much cheaper.
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ignition switch needs replaced same happened to mine. passlock system acts like someone is trying to steal it shuts off fuel pump for 10 minutes.
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