Question about 2005 GMC Sierra Denali

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Acc mode on ignition switch

I need to know if my 05 Denali's ignition switch is supposed to turn counter clockwise to run accessories in my vehicle?  And if the acc position of this vehicle is set up like imports, should the batt light on the dash illuminate or do I have alternator issues?

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  • lumpdady Apr 19, 2009

    In my search Ive found that domestic vehicles no lognger turn back for acc. I also had a test done on the batt and found that while it still starts fine I have a small drain/bad batt cell. So ill be getting a yellow top batt soon 

  • Anonymous Mar 17, 2014

    Vehicle won't start. Motor turns over and all accessories work but it just won' start

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Hello, no you should not be able to turn it back and yes in accessory position it will have the alternator light comming on without engine running. Please rate this answer, thank you.

Posted on Mar 10, 2009

  • suterman
    suterman Mar 11, 2009

    Hello, I'm very sorry I told you it would not turn . I was meaning to say no the alternator light will not come on when key is turned backwards,but the light will come on when turned to accessary position. I am very sorry for the mistake.

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Yes it should turn backwards and the alt light should be on without the truck running and the key turned forward or in the acc position

Posted on Mar 10, 2009

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I have a 2009 g envoy and when I turn my key it wont do anything.replaced the ignition switch and it has worked fine for about 5 months and now it is doing the same thing sometimes it will start right


On GM vehicles starting back in mid 2000's , maybe even before that. They started using inputs to the body control module from the ignition switch, from there the BCM controls all vehicle systems .
Power Mode Description and Operation
Serial Data Power Mode
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 0, Ignition 1, and Accessory.
To determine the correct power mode the BCM uses:
?€¢
The state of these signals


?€¢
The sequence of switch closures received by the BCM


?€¢
The status of the engine run flag

The chart indicates the power modes detected and transmitted by the BCM:

Correct Ignition Switch Inputs
Ignition Key Position

Power Mode Parameter

Engine Running

Sampled Ignition Signal State

Accessory

Ignition 1

Ignition 0
OFF
Off-Awake or RAP
No
Inactive
Off
Off
UNLOCK
Unlock or RAP Unlock
No
Inactive
Off
On
ACC
Accessory
No
Active
Off
On
ON
Run
No
Active
On
On
START
Crank
No
Inactive
On
On
ON
Run
Yes
Active
On
On
Fail-safe Operation
Since the operation of the vehicle systems depends on the power mode, there is a fail-safe plan in place should the body control module (BCM) fail to send a power mode message. The fail-safe plan covers modules with discrete ignition signal inputs as well as those modules using exclusively serial data control of power mode.
Serial Data Messages The modules that depend exclusively on serial data messages for power modes stay in the state dictated by the last valid BCM message until they receive the engine status from the powertrain control module (PCM). If the BCM fails, the modules monitor the serial data circuit for the engine run flag serial data. If the engine run flag serial data is true, indicating that the engine is running, the modules fail-safe to Run. In this state the modules and their subsystems can support all operator requirements. If the engine run flag serial data is false, indicating that the engine is not running, the modules fail-safe to OFF-AWAKE. In this state the modules are constantly checking for a change status message on the serial data circuits and can respond to both local inputs and serial data inputs from other modules on the vehicle.
Discrete Ignition Signals Those modules that have discrete ignition signal inputs also remain in the state dictated by the last valid BCM message received on the serial data circuits. They then check the state of their discrete ignition input to determine the current valid state. If the discrete ignition input is active, B+, the modules will fail-safe to the RUN power mode. If the discrete ignition input is not active, open or 0 voltage, the modules will fail-safe to OFF-AWAKE. In this state the modules are constantly checking for a change status message on the serial data circuits and can respond to both local inputs and serial data inputs from other modules on the vehicle.
You would need a scan tool that can read data from the BCM . What may be the problem is a lose connector , these pin's at connectors are tiny and doesn't take much for one to become lose.

Jan 16, 2015 | 2009 GMC Envoy

1 Answer

I connect the acc wire to 12 volt and stereo stays on all the time


The accessory wire is suppose to be hooked up to your ignition wire and not a constant 12 volt power source. Hooking it up to your ignition wire will only give the stereo power when your key is in the accessory position or in the running position. The constant power source that you mostly connected to is meant for the memory wire on your stereo which will allows it to save your setting when you turn the vehicle off and your stereo kicks off. Otherwise you will end up setting the clock and adjusting your EQ every time you turn it on.

Feb 22, 2014 | 2004 Pontiac Sunfire

1 Answer

Color code


Most newer vehicles (yours included) have a lot more contacts than just the three you are talking about. I have a 2001 dodge grand caravan and it has 13 different wires running to the ignition switch. The point here is that you will have to combine several wires on one contact which may or may not do the same things the original switch does which may lead to all sorts of strange problems with the engine, transmission and all the other accessories on the vehicle. The other problem is since you will have more things running on one contact, your new switch may be overloaded and prematurely fail or even start a fire since some of the main feeder wires to the ignition switch may not be fused small enough to prevent overheating the switch. A factory/OEM switch may be more expensive but in the long run will save way more problems than the cheaper switch will. To specifically answer your question, most over-the-counter vehicle service manuals available at any auto parts store or in some libraries have generic wiring diagrams that should show you which wire would go where.

May 12, 2013 | 2000 Dodge Caravan

1 Answer

Yes i have a 2007 gmc yukon denali. when i bought it they didnt give me the keyless entry pad with remote start, then when they did give me one it wasnt the one for my vehicle, they told me all i had to do...


Close all the vehicle doors.
Insert the ignition key into the ignition lock cylinder.
Press and hold the DOOR unlock switch.
While holding the DOOR lock switch in the unlock position, cycle the ignition ON, OFF, ON, OFF.
Release the DOOR unlock switch. The doors will lock and unlock to confirm the program mode.
Press and hold the LOCK button and the UNLOCK button simultaneously on one keyless remote. After a delay of approximately 15 seconds , the doors will lock and unlock to confirm the programming of that transmitter.
Repeat the previous step to program up to four transmitters.
Turn the ignition switch to the RUN (one more click forward) position in order to exit the keyless entry transmitter mode.
Operate the transmitter functions in order to verify correct system operation

Feb 11, 2011 | 2007 GMC Yukon Denali

3 Answers

Key locks in the ignition in the ACC position. can't take key out


when you turn key to acc pos that is telling the ignition to go into a accessory mode which runs the radio,wipers etc... but it doesnt allow the ignition circuit to run, and the key in most vehicles will not be able to come out,this is a security protection so that you do not leave accessories on that will drain the battery. The ignition key should only be able to be removed in the OFF position.

Jan 21, 2011 | 2001 Saturn L-Series

2 Answers

None of my power windows on 1998 Mercury Mountaineer work, checked fuses but can't find power relay if there is one. Any suggestions


If you checked the fuses and they are fine, try this. With the key on and the window button down or up, open and close the door holding in the up or down position. If the window moves, there is a wire(s) are broken in the wire harness that goes from the door jam to the door. This is a common problem that we find with window and door operating problems. You may find 1 bad or broken wire, or 4-5 broken wires. Let us know if this help you find a repair, for this concern. Craig

Jan 23, 2010 | 1998 Mercury Mountaineer

1 Answer

1994 K1500- key will not turn to start truck,will turn to acc., but not start position


Two possibile solutions:

1. Steering wheel may be "binding" the ignition switch. Turn the steering wheel slightly either clockwise or counter-clockwise while turning the key.
2.Use different key or "flip" your key.

Hope this helps!

Sep 10, 2009 | 1994 Chevrolet K1500

1 Answer

Set the keyless entry


TS06 DEC 05 Keyless Entry - Transmitter(s) Inoperative

There was a recall in DEC. 05 for this particular vehicles remote transmitter system....though im not sure if they would do service free of charge now...

Moving along...if you have no working transmitter, you have to do the following to get it working again:

* Ensure vehicle audio PIN number is known or audio PIN security system is deactivated prior to battery disconnection.
* Ensure a door is open
* Disconnect the negative battery cable, wait minimum 5 seconds then reconnect
* Within 20 seconds of reconnecting the battery cable, insert the keyin ignition then cycle the ignition key from the "ACC" position to the"ON" position 20 times, leaving the key in the "OFF" position after thetwentieth turn.
* the vehicle's indicators will flash 20 times to indicate successfulentry. NOTE: Should the indicators fail to flash, wait 5 seconds thenquickly turn the ignition switch from the "ACC" to "ON" position 10times, leave the ignition "OFF" after the 10th turn and wait 15 secondsthen recycle the ignition switch 20 times.
* the vehicle's indicators will flash 20 times to indicate successful entry.
* within 10 seconds of the indicators having ceased flashing, press the button once on each transmitter.
* turn the ignition key to the "ON" position to lock in and exit from the programming mode.

And if you have even 1 transmitter that does work, its not nearly as difficult:

* ensure a door is open
* remove key from ignition
* lock the doors using the transmitter
* unlock the doors using the transmitter

Within 20 seconds of unlocking, insert key in ignition, turn theignition key from the "ACC" position to the "ON" position 20 times,leaving the key in the "OFF" position after the twentieth turn.

The vehicle's indicators will flash 20 times to indicate successful entry.

Within 10 seconds of the indicators having ceased flashing, press thebutton once on each transmitter. Once finished, turn the ignition keyto the "ON" position to lock in and exit from the programming mode.

Hope this helped,
Jem

Nov 12, 2008 | 2004 Suzuki Verona

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