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2017 Corvette: Service Bulletin: Vehicle Time Out for Parasitic Draw Testing

Vehicle Time Out for Parasitic Draw Testing

GM TechLink - September 18, 2016

Many control modules in a vehicle stay awake for different amounts of time after the ignition is turned off. To help with diagnosis of parasitic drains, a Vehicle Time Out chart has been developed for 2015 ATS, ATS-V; 2017 LaCrosse, CT6, CTS, XT5, Corvette, Acadia (VIN N); and 2016 Camaro models listing the times after a specific event that certain modules stay awake. Components most likely to cause a parasitic draw on a vehicle’s battery are switches, relays, and control modules.

The charts lists the amount of time the modules controlling the HVAC, Flashers, Infotainment/DIC, Drive Mode Switch, Park Assist, Headlamps, and Engine Start/Stop features are awake after each of three specific events — door open/close, key fob unlock, and passive unlock.

Refer to Bulletin #16-NA-272 for the chart. It is not a complete listing of all modules that may be active after the ignition is turned off (for example, the interior lights), but includes the most common. Of the modules or switches that are listed, the backlighting or status LED will be on for the time listed.

Powering Down

After the ignition is turned off, the control modules will begin to go to sleep. However, all control modules do not go to sleep at the same time; some may take up to 30 minutes or longer after turning the ignition off before going to sleep. Other modules may periodically wake up and then go back to sleep. It can take up to two hours before all systems power down allowing the parasitic draw test to pass. An occasional increase in the parasitic draw is normal as long as it returns within one second. These are all normal conditions.

There are many things that can prevent a vehicle from completely going to sleep and passing the parasitic draw test. Make sure all the following conditions are met before performing the parasitic current draw test using the EL 38758 parasitic draw test switch. (Fig. 27)

• Ignition off
• Key out of the ignition switch – when not equipped with keyless access and start
• Retained Accessory Power off – open and close the driver’s door after turning off the ignition
• Scan tool not communicating with a vehicle control module – in some cases it may need to be disconnected from the DLC
• All access doors closed
• Headlamps off – Auto headlamps disabled
• Any delay lighting off
• Disable any underhood lamp, if equipped
• HVAC afterblow off
• Any accessory that can work with ignition off is inactive or off
• Wait up to two minutes or longer, after all other listed conditions are met


#16-NA-272: Information on Vehicle Time Out for Parasitic Draw Testing - (Aug 25, 2016)

Subject Information on Vehicle Time Out for Parasitic Draw Testing

Brand:

Model:

Model Year:

VIN:

Engine:

Transmission:

from

to

from

to

Buick

LaCrosse

2017

2017

       

Cadillac

ATS

2015

2015

ATS-V

2015

2015

CT6

2017

2017

CTS

2017

2017

XT5

2017

2017

Chevrolet

Camaro

2016

2016

Corvette

2017

2017

GMC

Acadia (VIN N)

2017

2017

 

Involved Region or Country

North America and N.A Export Regions

Condition

The chart below shows times after specific events that certain items stay awake. Those events include Door Open Close, Key Fob Unlock, and Passive Unlock. Certain Modules stay awake for a specific amount of time. This information is to inform technicians to avoid mis-diagnosis of parasitic drains.

Vehicle Time Out Chart

Note: This is not a complete listing of all modules that may be active after the ignition is turned off (for example Dome and Interior lights). On the modules or switches that are listed, Customers and Technicians may notice that the backlighting or status LED will be on for the time listed.

Make

Model

Test 1

On Times

Test 2

On Times

Test 3

On Times

 

Buick

LaCrosse

Sitting In Seat Open/Close Door

HVAC - 18 Sec

Flasher - 18 Sec

Infotainment/DIC - 25 Sec

Drive mode Switch - N/A

Park Assist - 18 Sec Head lamp indicator - N/A

Engine Start/Stop - 18 Sec

Standing on the outside of vehicle using FOB unlock

HVAC - 18 Sec

Flasher - 18 Sec

Infotainment/DIC - 40 Sec

Drive mode Switch - N/A

Park Assist - N/A

Head lamp indicator - 30 Sec

Engine Start/Stop - N/A

Standing on outside of vehicle using passive lock

HVAC - N/A

Flasher - N/A

Infotainment/DIC - 10 Sec

Drive mode Switch - N/A

Park Assist - N/A

Head lamp indicator - N/A

Engine Start/Stop - N/A

Cadillac

ATS

ATS-V

Sitting In Seat Open/Close Door

HVAC - 25 Sec

Flasher - N/A

Infotainment/DIC - 25 Sec

Drive mode Switch - 16 Sec

Park Assist - N/A

Head lamp indicator - N/A

Engine Start Stop - N/A

Standing on the outside of vehicle using FOB unlock

HVAC - 10 Sec

Flasher - N/A

Infotainment/DIC - 10 Sec

Drive mode Switch - N/A

Park Assist - N/A

Head lamp indicator - N/A

Engine Start/Stop - N/A

Standing on outside of vehicle using passive lock

HVAC - 10 Sec

Flasher - N/A

Infotainment/DIC - 10 Sec

Drive mode Switch - N/A

Park Assist - N/A

Head lamp indicator - N/A

Engine Start/Stop - N/A

 

CT6

Sitting In Seat Open/Close Door

HVAC - 25 Sec

Flasher - 10 Min

Infotainment/DIC - 25 Sec

Drive mode Switch - N/A

Park Assist - 10 Min

Head lamp indicator - N/A

Engine Start Stop - N/A

Standing on the outside of vehicle using FOB unlock

HVAC - 40 Sec

Flasher - 10 Min

Infotainment/DIC - 40 Sec

Drive mode Switch - N/A

Park Assist - 10 Min

Head lamp indicator - 30 Sec

Engine Start Stop - N/A

Standing on outside of vehicle using passive lock

HVAC - 40 Sec

Flasher - 10 Min

Infotainment/DIC - 40 Sec

Drive mode Switch - N/A

Park Assist - 10 Min

Head lamp indicator - 30 Sec

Engine Start Stop - N/A

CTS

Sitting In Seat Open/Close Door

HVAC - 25 Sec

Flasher - 10 Min

Infotainment/DIC - 25 Sec

Drive mode Switch - 18 Sec

Park Assist - 10 Min

Head lamp indicator - N/A

Engine Start Stop - N/A

Standing on the outside of vehicle using FOB unlock

HVAC - 40 Sec

Flasher - 10 Min

Infotainment/DIC - 40 Sec

Drive mode Switch - N/A

Park Assist - 10 Min

Head lamp indicator - 30 Sec

Engine Start Stop - N/A

Standing on outside of vehicle using passive lock

HVAC - 40 Sec

Flasher - 1 Min 12 Sec

Infotainment/DIC - 40 Sec

Drive mode Switch - N/A

Park Assist - 1 Min 12 Sec

Head lamp indicator - 30 Sec

Engine Start Stop - N/A

XT5

Sitting In Seat Open/Close Door

HVAC - 25 Sec

Flasher - 10 Min

Infotainment/DIC - 16 Sec

Drive mode Switch- N/A

Park Assist - 10 Min

Head lamp indicator - N/A

Engine Start Stop - N/A

Standing on the outside of vehicle using FOB unlock

HVAC - 10 Sec

Flasher - 10 Min

Infotainment/DIC - N/A

Drive mode Switch - N/A

Park Assist - 10 Min

Head lamp indicator - 30 Sec

Engine Start Stop - N/A

Standing on outside of vehicle using passive lock

HVAC - 10 Sec

Flasher - 10 Min

Infotainment/DIC - N/A

Drive mode Switch - N/A

Park Assist - 10 Min

Head lamp indicator - 30 Sec

Engine Start Stop - N/A

Chevrolet

Camaro

Sitting In Seat Open/Close Door

HVAC - 25 Sec

Flasher - N/A

Infotainment/DIC - 25 Sec

Drive mode Switch - 25 Sec

Park Assist - N/A

Head lamp indicator - N/A

Engine Start Stop - N/A

Standing on the outside of vehicle using FOB unlock

HVAC - N/A

Flasher - N/A

Infotainment/DIC - 38 Sec

Drive mode Switch - N/A

Park Assist - N/A

Head lamp indicator - N/A

Engine Start Stop - N/A

Standing on outside of vehicle using passive lock

HVAC - N/A

Flasher - N/A

Infotainment/DIC - 12 Sec

Drive mode Switch - N/A

Park Assist - N/A

Head lamp indicator - N/A

Engine Start Stop - N/A

Corvette

Sitting In Seat Open/Close Door

HVAC - N/A

Flasher - N/A

Infotainment/DIC - 15 Sec

Drive mode Switch - 15 Sec

Park Assist - N/A

Head lamp indicator - N/A

Engine Start Stop - 15 Sec

Standing on the outside of vehicle using FOB unlock

Only lights on Front Dome and Rear Interior- 25 Sec

Standing on outside of vehicle using passive lock

Passive lock pops open door. Refer to Test one

GMC

Acadia

(VIN N)

Sitting In Seat Open/Close Door

HVAC - 15 Sec

Flasher - 18 Sec

Infotainment/DIC - 35 Sec

Drive mode Switch - 10 Min

Park Assist - 18 Sec

Head lamp indicator - N/A

Engine Start Stop - 15 Sec

Standing on the outside of vehicle using FOB unlock

HVAC - N/A

Flasher - N/A

Infotainment/DIC - 35 Sec

Drive mode Switch - 10 Min

Park Assist - N/A

Head lamp indicator - 30 Sec

Engine Start Stop - N/A

Standing on outside of vehicle using passive lock

HVAC - N/A

Flasher - N/A

Infotainment/DIC - 12 Sec

Drive mode Switch - 10 Min

Park Assist - N/A

Head lamp indicator - N/A

Engine Start Stop - N/A

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