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Thread: Stuck Key and Ignition Circuit Diagram

  1. #1
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    Default Stuck Key and Ignition Circuit Diagram

    Anyone have an ignition circuit diagram for a 08 G8. Having "stuck key problems" and wanted to understand all interconnection devices for starting, locking shifter, etc. Shifter is NOT locked in park, as a matter of fact, it will pull out of park just sitting. But cannot turn key to OFF position to remove. Can start it. Putting it in park will activate the door unlock and the indicator on the dash says it's in park. That tells me the Shift Lock Sensor at least sees that. Brake pedal position sensor does not seem to cause relay to click near the shifter. Saw this in a video. Brake lights work.

    Trying to figure this out so I don't get reamed at either the dealership or a shop.

    Any suggestions?

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    VIP Member STL_G8GT's Avatar
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    Yoire saying you can move shifter without pulling the "trigger" button?
    2009 PBM G8 GT
    Pat G 218/226 & TSP Dual 660s, ARP Bits, DSteck Tuned, Magnacharger Chrome 2300 1:1, RCR Ported/Polished TB, Blower, & L92 Heads w/ LS3 intake valves, Smith Brothers Trunion Bushing Kit, ARH 1 7/8 Magnaflow MidMuff/Solo Axlebacks, RotoFab, VaporWorx PWM 1:1 fuel system, ID1050x injectors
    Mike Norris Motorsports Catchcan, AEM 30-4100, JHP Boost/Fuel Gauge Pod
    TSW Nurburgring Matte Gray 18" w/Nitto 555 & 555R, Satin Black SS Brembo Fronts, BMR Trailing Arms, Pedders Sway Bars, Whiteline Bushings
    Gloss Black Valve Covers, 6k HID, V6 Handles, Interior/License Plate LEDs, Debadged, Holden Black Trim, Polk Dxi, GXP diffusor, a few bits from Crazy Paul

    Originally Posted by TonyKarter
    Anyone who has ever worked on a car has been in your position, and sitting cross-legged on a concrete floor with a dim shop light is its own kind of hell... Chalk it up as one of the rites of passage.
    RIP Charlie - GRRRR8
    RIP Chris Wells - Panzer Leader

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    VIP Member STL_G8GT's Avatar
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    2009 PBM G8 GT
    Pat G 218/226 & TSP Dual 660s, ARP Bits, DSteck Tuned, Magnacharger Chrome 2300 1:1, RCR Ported/Polished TB, Blower, & L92 Heads w/ LS3 intake valves, Smith Brothers Trunion Bushing Kit, ARH 1 7/8 Magnaflow MidMuff/Solo Axlebacks, RotoFab, VaporWorx PWM 1:1 fuel system, ID1050x injectors
    Mike Norris Motorsports Catchcan, AEM 30-4100, JHP Boost/Fuel Gauge Pod
    TSW Nurburgring Matte Gray 18" w/Nitto 555 & 555R, Satin Black SS Brembo Fronts, BMR Trailing Arms, Pedders Sway Bars, Whiteline Bushings
    Gloss Black Valve Covers, 6k HID, V6 Handles, Interior/License Plate LEDs, Debadged, Holden Black Trim, Polk Dxi, GXP diffusor, a few bits from Crazy Paul

    Originally Posted by TonyKarter
    Anyone who has ever worked on a car has been in your position, and sitting cross-legged on a concrete floor with a dim shop light is its own kind of hell... Chalk it up as one of the rites of passage.
    RIP Charlie - GRRRR8
    RIP Chris Wells - Panzer Leader

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    Sorry. No have to pull the button, but do not have to apply brake. Button pulls regardless.

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    Thanks for the PDF's. Those will help. Just trying to narrow this down. Could be as simple as a faulty ignition switch, but was trying to make sure all switches were lined up to let the key go back to off/lock position and be removed. Had transmission worked on in January and was also leaning toward faulty neutral safety switch. But problem just now surfaced.

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    VIP Member STL_G8GT's Avatar
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    Auto trans shifter pinout.

    Auto Trans Shifter Pinout.pdf

    In order for the key cylinder to be unlocked, you've gotta pass ground from pin 3 to 6, I believe.

    I am not totally sure how the cylinder acts, however, if this was simply an interlock issue then maybe you're able to actually turn the key to OFF, just not remove it.

    it sounds like you've said that you can't turn it to the off position, however. But again, as you mentioned, the car is seeing the trans as being in park evidenced by the doors unlocking. Odd for sure.
    2009 PBM G8 GT
    Pat G 218/226 & TSP Dual 660s, ARP Bits, DSteck Tuned, Magnacharger Chrome 2300 1:1, RCR Ported/Polished TB, Blower, & L92 Heads w/ LS3 intake valves, Smith Brothers Trunion Bushing Kit, ARH 1 7/8 Magnaflow MidMuff/Solo Axlebacks, RotoFab, VaporWorx PWM 1:1 fuel system, ID1050x injectors
    Mike Norris Motorsports Catchcan, AEM 30-4100, JHP Boost/Fuel Gauge Pod
    TSW Nurburgring Matte Gray 18" w/Nitto 555 & 555R, Satin Black SS Brembo Fronts, BMR Trailing Arms, Pedders Sway Bars, Whiteline Bushings
    Gloss Black Valve Covers, 6k HID, V6 Handles, Interior/License Plate LEDs, Debadged, Holden Black Trim, Polk Dxi, GXP diffusor, a few bits from Crazy Paul

    Originally Posted by TonyKarter
    Anyone who has ever worked on a car has been in your position, and sitting cross-legged on a concrete floor with a dim shop light is its own kind of hell... Chalk it up as one of the rites of passage.
    RIP Charlie - GRRRR8
    RIP Chris Wells - Panzer Leader

  7. #7
    VIP Member STL_G8GT's Avatar
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    Try this, vague, but it might help...

    Shift lock troubleshooting.pdf
    2009 PBM G8 GT
    Pat G 218/226 & TSP Dual 660s, ARP Bits, DSteck Tuned, Magnacharger Chrome 2300 1:1, RCR Ported/Polished TB, Blower, & L92 Heads w/ LS3 intake valves, Smith Brothers Trunion Bushing Kit, ARH 1 7/8 Magnaflow MidMuff/Solo Axlebacks, RotoFab, VaporWorx PWM 1:1 fuel system, ID1050x injectors
    Mike Norris Motorsports Catchcan, AEM 30-4100, JHP Boost/Fuel Gauge Pod
    TSW Nurburgring Matte Gray 18" w/Nitto 555 & 555R, Satin Black SS Brembo Fronts, BMR Trailing Arms, Pedders Sway Bars, Whiteline Bushings
    Gloss Black Valve Covers, 6k HID, V6 Handles, Interior/License Plate LEDs, Debadged, Holden Black Trim, Polk Dxi, GXP diffusor, a few bits from Crazy Paul

    Originally Posted by TonyKarter
    Anyone who has ever worked on a car has been in your position, and sitting cross-legged on a concrete floor with a dim shop light is its own kind of hell... Chalk it up as one of the rites of passage.
    RIP Charlie - GRRRR8
    RIP Chris Wells - Panzer Leader

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    Thanks again. All of this is electronic is it not? A friend(great mechanic), over the phone said something about a cable to the ignition(mechanical), from the shifter. He has not messed with G8's and is probably used to other systems. Said the release through the cable could be binding. Just a question. I'm going into the shifter now.

  9. #9
    VIP Member STL_G8GT's Avatar
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    All electronic, relays and solenoids. The BCM is involved, as well.

    I would use that last document I posted for the troubleshooting techniques and test it the way they say to. They specifically are talking about what leads to not being able to put the key in the OFF position, much less remove it.

    Good luck!
    2009 PBM G8 GT
    Pat G 218/226 & TSP Dual 660s, ARP Bits, DSteck Tuned, Magnacharger Chrome 2300 1:1, RCR Ported/Polished TB, Blower, & L92 Heads w/ LS3 intake valves, Smith Brothers Trunion Bushing Kit, ARH 1 7/8 Magnaflow MidMuff/Solo Axlebacks, RotoFab, VaporWorx PWM 1:1 fuel system, ID1050x injectors
    Mike Norris Motorsports Catchcan, AEM 30-4100, JHP Boost/Fuel Gauge Pod
    TSW Nurburgring Matte Gray 18" w/Nitto 555 & 555R, Satin Black SS Brembo Fronts, BMR Trailing Arms, Pedders Sway Bars, Whiteline Bushings
    Gloss Black Valve Covers, 6k HID, V6 Handles, Interior/License Plate LEDs, Debadged, Holden Black Trim, Polk Dxi, GXP diffusor, a few bits from Crazy Paul

    Originally Posted by TonyKarter
    Anyone who has ever worked on a car has been in your position, and sitting cross-legged on a concrete floor with a dim shop light is its own kind of hell... Chalk it up as one of the rites of passage.
    RIP Charlie - GRRRR8
    RIP Chris Wells - Panzer Leader

  10. #10
    VIP Member Leon McJones's Avatar
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    When I had intermittent key stuck events I tested relays, fuses, less costly electronics and in the end it was the ground signal switch on the shift assembly. Good luck to you and I hope yours is simpler.
    09 White Hot G8 GT
    Tuned by Rick Crawford
    Kooks, Circle-D, Vararam, HSRK, BP catch can, RP oil
    DBA 4000, Hawk Ceramic, Russel Stanless, Ate Super Blue,
    FE3, Whiteline, BMR, UMI, Spohn

    Homelink, Adams Premium, Infinity Reference

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