21 replies to this topic

[GMC04Z71]

hey guys i have a 04GMC and the warranty is up on it and the heated seat on the driver side will not work. all it does is when u turn on the seat it lights up for just a second and the relay will click under the dash and go off. but the passenger side works fine, but if u have the passenger side on and u try to cut on the driver side they will all go off. does anybody know what the problem is and what is the cure or how to troubleshoot?

[M. Cueva]

dont work for GM anymore, but here is some info that can help:


Document ID# 1864985
2004 Chevrolet Chevy C Silverado - 2WD


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Subject: Heated Seat Inoperative Or Shuts Off In 30 Seconds - keywords B1825 B2435 B2440 B3606 #PIT3287D - (10/02/2006)



Models: 2003-2006 Cadillac Escalade, Escalade ESV, Escalade EXT

2003-2006 Chevrolet Avalanche, Suburban, Tahoe

2003-2007 Silverado Classic

2003-2007 GMC Sierra Classic, Sierra Denali Classic

2003-2006 Yukon, Yukon Denali, Yukon XL, Yukon Denali XL

2003-2007 Hummer H2




--------------------------------------------------------------------------------

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:
Driver and passenger heated seats inoperative or shut off in 30 seconds. There will be DTCs B2435, B2440, B3606 and/or B1825 set in the Drivers Seat Module. The adjustable pedal position sensor, seat recliner position sensor and both heat seat thermistors share the same 5 volt reference internal to the Drivers Seat Module. A fault in any of these components/circuits can make the heated seats inoperative or shut off in 30 seconds, as well as, the seat recliner and/or adjustment pedals may move in short increments when operated. A fault in heated seats, adjustable pedal or seat recliner will affect BOTH heated seats.

Note:: Even if the vehicle is not equipped with adjustable pedals DTC B3606 still may set.

Recommendation/Instructions:
To help isolate the area of concern use the Tech 2 and go to "Sensor Data" in the Drivers Seat Module. Monitor the following parameters for being out of range:

Recline Position- Normal range .39V-4.58V

Pedal Position (if equipped) - Normal range .39V-4.58V

Psgr. Seat Heat Sensor- Normal range 1V-4V

Drvr. Seat Heat Sensor- Normal range 1V-4V

If a parameter is found to be out of range inspect circuits for any opens, shorts to ground, or voltage. If none found replace the suspect component.

Please be aware of the following common areas of concern:

The adjustable pedal position sensor internally shorted pulling the 5 volt reference low. Disconnect the adjustable pedal position sensor and see if the heated seats start working correctly, if so replace.
Note Important:: The APP (Accelerator Pedal Position) sensor is NOT the adjustable pedal position sensor. Make sure the correct sensor, adjustable pedal position sensor, is disconnected.

The seat recliner position sensor internally shorted pulling the 5 volt reference low. Disconnect the recliner position sensor and see if heated seats start working correctly, if so replace.
An open in either heated seat thermistor circuits (signal or low reference). The most common is the passenger thermistor where it passes through seat connector C305 pin "L" or "K" or C399 pins "R" or "G".
A chaff to ground on either heated seat thermistor signal circuits. The most common is circuit 5475 black/red or dark blue shorted to ground in the passenger seat near the buckle.
Note Important:: The heated seat thermistors act differently to "OPENS and SHORTS" than the adjustable pedal position sensor and seat recliner position sensor. The adjustable pedals and seat recliner sensors can be disconnected for testing of the heated seats. Where as the heated seat thermistor circuit must be working correctly before EITHER heated seat will operate. Disconnecting one thermistor, which may have a concern will not allow the opposite heated seat to work correctly, BOTH side must be operational before EITHER heated seat will operate.

Clearing DTCs

If DTCs will not clear when using the Tech 2 after a repair has been made, try operating the device in which the repair was made. Example, if a repair was made to the passenger heated seat thermistor circuit, the DTCs may not clear unless the passenger heated seat is operated.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.



GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION


© Copyright General Motors Corporation. All Rights Reserved.


--------------------------------------------------------------------------------
Document ID# 1864985
2004 Chevrolet Chevy C Silverado - 2WD




















Document ID# 1471400
2004 Chevrolet Chevy C Silverado - 2WD


--------------------------------------------------------------------------------


Subject: Service Information for Front Heated Seat Inoperative/Cold #04-08-50-007 - (03/12/2004)



Models: 2003-2004 Cadillac Escalade/ESV/EXT

2003-2004 Chevrolet Avalanch/Silverado/Suburban/Tahoe

2003-2004 GMC Denali/Sierra/Yukon/Yukon XL

2003-2004 Hummer H2




--------------------------------------------------------------------------------

The purpose of this bulletin is to provide the technician with the following service information:

• Heated Seats Switch Operation

• Heated Seats Switch Diagnostics

• Heated Seats Switch Customer Information

Switch Operation
The engine must be running for the heated seat feature to work. The heated seats will shut off automatically when the ignition is turned off.



Two buttons, located on the door, are used to control the heated seat.
• Press the horizontal (RH) button to heat the entire seat, back and cushion.

• Press the vertical (LH) button to heat ONLY the seat back.

• The three light bars are an indicator of the level of heat selected for either the entire seat (horizontal button) or ONLY the seat back (vertical button).





To heat both the seat back and seat cushion at the same time, press the horizontal (RH) button with the heated seat symbol one time.
• All 3 light bars will glow indicating the HIGH temperature setting.

• The horizontal (RH) button does NOT have an ON/OFF indicator light.

Press the button a second time, 2 light bars will glow indicating the MEDIUM temperature setting for the entire seat.
Press the button a third time, 1 light bar will glow indicating the LOW temperature setting for the entire seat.
Press the button a fourth time to turn the entire heated seat OFF.



To heat ONLY the seat back, press the vertical (LH) button one time.
• An ON/OFF indicator light over the heated seat back symbol will glow to designate that ONLY the seat back is being heated.

• All 3 light bars over the horizontal (RH) button will glow indicating the HIGH temperature setting for ONLY the seat back.

Press the button a second time, 2 light bars will glow indicating the MEDIUM temperature setting for ONLY the seat back.
Press the button a third time, 1 light bar will glow indicating the LOW temperature setting for ONLY the seat back.
Press the button a fourth time to turn the heated seat back OFF.
Switch Diagnostics
Important: In order to eliminate unnecessary part replacement and comeback repairs, it is essential that the appropriate diagnostic tables and aids found in the applicable manuals are followed.

Verify the condition prior to making any repairs. Refer to Seats and Seat Controls in the applicable Owners Manual or this bulletin for proper heated seat switch operation information.
If an improperly operating front heated seat condition exists, refer to the Diagnostic Information and Procedures in the Seats sub-section of the applicable Service Manual in order to diagnose the system accurately.
When measuring the resistance of the seat heater elements, ensure the values are within the updated range of 1.5-5.5 ohms. Refer to DTC B2425 or B2430-Clearing the DTC in the Diagnostic Information and Procedures in the Seats sub-section of the applicable Service Manual.
Customer Information
Some heated seat components from the above listed vehicles have been returned to the Warranty Parts Center (WPC) for heat function not operating properly. Analyses of these parts show 'no out of specification condition' or No Trouble Found (NTF).

Provide customers with the knowledge that if bumped, either one of the heated seat switches can be activated/deactivated accidentally.
Ensure customers have a thorough understanding of how the heated seat switches function.


GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION


© Copyright General Motors Corporation. All Rights Reserved.


--------------------------------------------------------------------------------
Document ID# 1471400
2004 Chevrolet Chevy C Silverado - 2WD

[GMC04Z71]

dont work for GM anymore, but here is some info that can help:


Document ID# 1864985
2004 Chevrolet Chevy C Silverado - 2WD


--------------------------------------------------------------------------------


Subject: Heated Seat Inoperative Or Shuts Off In 30 Seconds - keywords B1825 B2435 B2440 B3606 #PIT3287D - (10/02/2006)



Models: 2003-2006 Cadillac Escalade, Escalade ESV, Escalade EXT

2003-2006 Chevrolet Avalanche, Suburban, Tahoe

2003-2007 Silverado Classic

2003-2007 GMC Sierra Classic, Sierra Denali Classic

2003-2006 Yukon, Yukon Denali, Yukon XL, Yukon Denali XL

2003-2007 Hummer H2




--------------------------------------------------------------------------------

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:
Driver and passenger heated seats inoperative or shut off in 30 seconds. There will be DTCs B2435, B2440, B3606 and/or B1825 set in the Drivers Seat Module. The adjustable pedal position sensor, seat recliner position sensor and both heat seat thermistors share the same 5 volt reference internal to the Drivers Seat Module. A fault in any of these components/circuits can make the heated seats inoperative or shut off in 30 seconds, as well as, the seat recliner and/or adjustment pedals may move in short increments when operated. A fault in heated seats, adjustable pedal or seat recliner will affect BOTH heated seats.

Note:: Even if the vehicle is not equipped with adjustable pedals DTC B3606 still may set.

Recommendation/Instructions:
To help isolate the area of concern use the Tech 2 and go to "Sensor Data" in the Drivers Seat Module. Monitor the following parameters for being out of range:

Recline Position- Normal range .39V-4.58V

Pedal Position (if equipped) - Normal range .39V-4.58V

Psgr. Seat Heat Sensor- Normal range 1V-4V

Drvr. Seat Heat Sensor- Normal range 1V-4V

If a parameter is found to be out of range inspect circuits for any opens, shorts to ground, or voltage. If none found replace the suspect component.

Please be aware of the following common areas of concern:

The adjustable pedal position sensor internally shorted pulling the 5 volt reference low. Disconnect the adjustable pedal position sensor and see if the heated seats start working correctly, if so replace.
Note Important:: The APP (Accelerator Pedal Position) sensor is NOT the adjustable pedal position sensor. Make sure the correct sensor, adjustable pedal position sensor, is disconnected.

The seat recliner position sensor internally shorted pulling the 5 volt reference low. Disconnect the recliner position sensor and see if heated seats start working correctly, if so replace.
An open in either heated seat thermistor circuits (signal or low reference). The most common is the passenger thermistor where it passes through seat connector C305 pin "L" or "K" or C399 pins "R" or "G".
A chaff to ground on either heated seat thermistor signal circuits. The most common is circuit 5475 black/red or dark blue shorted to ground in the passenger seat near the buckle.
Note Important:: The heated seat thermistors act differently to "OPENS and SHORTS" than the adjustable pedal position sensor and seat recliner position sensor. The adjustable pedals and seat recliner sensors can be disconnected for testing of the heated seats. Where as the heated seat thermistor circuit must be working correctly before EITHER heated seat will operate. Disconnecting one thermistor, which may have a concern will not allow the opposite heated seat to work correctly, BOTH side must be operational before EITHER heated seat will operate.

Clearing DTCs

If DTCs will not clear when using the Tech 2 after a repair has been made, try operating the device in which the repair was made. Example, if a repair was made to the passenger heated seat thermistor circuit, the DTCs may not clear unless the passenger heated seat is operated.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.



GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION


© Copyright General Motors Corporation. All Rights Reserved.


--------------------------------------------------------------------------------
Document ID# 1864985
2004 Chevrolet Chevy C Silverado - 2WD




















Document ID# 1471400
2004 Chevrolet Chevy C Silverado - 2WD


--------------------------------------------------------------------------------


Subject: Service Information for Front Heated Seat Inoperative/Cold #04-08-50-007 - (03/12/2004)



Models: 2003-2004 Cadillac Escalade/ESV/EXT

2003-2004 Chevrolet Avalanch/Silverado/Suburban/Tahoe

2003-2004 GMC Denali/Sierra/Yukon/Yukon XL

2003-2004 Hummer H2




--------------------------------------------------------------------------------

The purpose of this bulletin is to provide the technician with the following service information:

• Heated Seats Switch Operation

• Heated Seats Switch Diagnostics

• Heated Seats Switch Customer Information

Switch Operation
The engine must be running for the heated seat feature to work. The heated seats will shut off automatically when the ignition is turned off.



Two buttons, located on the door, are used to control the heated seat.
• Press the horizontal (RH) button to heat the entire seat, back and cushion.

• Press the vertical (LH) button to heat ONLY the seat back.

• The three light bars are an indicator of the level of heat selected for either the entire seat (horizontal button) or ONLY the seat back (vertical button).





To heat both the seat back and seat cushion at the same time, press the horizontal (RH) button with the heated seat symbol one time.
• All 3 light bars will glow indicating the HIGH temperature setting.

• The horizontal (RH) button does NOT have an ON/OFF indicator light.

Press the button a second time, 2 light bars will glow indicating the MEDIUM temperature setting for the entire seat.
Press the button a third time, 1 light bar will glow indicating the LOW temperature setting for the entire seat.
Press the button a fourth time to turn the entire heated seat OFF.



To heat ONLY the seat back, press the vertical (LH) button one time.
• An ON/OFF indicator light over the heated seat back symbol will glow to designate that ONLY the seat back is being heated.

• All 3 light bars over the horizontal (RH) button will glow indicating the HIGH temperature setting for ONLY the seat back.

Press the button a second time, 2 light bars will glow indicating the MEDIUM temperature setting for ONLY the seat back.
Press the button a third time, 1 light bar will glow indicating the LOW temperature setting for ONLY the seat back.
Press the button a fourth time to turn the heated seat back OFF.
Switch Diagnostics
Important: In order to eliminate unnecessary part replacement and comeback repairs, it is essential that the appropriate diagnostic tables and aids found in the applicable manuals are followed.

Verify the condition prior to making any repairs. Refer to Seats and Seat Controls in the applicable Owners Manual or this bulletin for proper heated seat switch operation information.
If an improperly operating front heated seat condition exists, refer to the Diagnostic Information and Procedures in the Seats sub-section of the applicable Service Manual in order to diagnose the system accurately.
When measuring the resistance of the seat heater elements, ensure the values are within the updated range of 1.5-5.5 ohms. Refer to DTC B2425 or B2430-Clearing the DTC in the Diagnostic Information and Procedures in the Seats sub-section of the applicable Service Manual.
Customer Information
Some heated seat components from the above listed vehicles have been returned to the Warranty Parts Center (WPC) for heat function not operating properly. Analyses of these parts show 'no out of specification condition' or No Trouble Found (NTF).

Provide customers with the knowledge that if bumped, either one of the heated seat switches can be activated/deactivated accidentally.
Ensure customers have a thorough understanding of how the heated seat switches function.


GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION


© Copyright General Motors Corporation. All Rights Reserved.


--------------------------------------------------------------------------------
Document ID# 1471400
2004 Chevrolet Chevy C Silverado - 2WD

thanks man every little bit helps

[M. Cueva]

sure, but I dont know what it could be since I dont have heated seats nor ever heard of the click sound you get when it shuts itself off (short maybe)?

[GMC04Z71]

sure, but I dont know what it could be since I dont have heated seats nor ever heard of the click sound you get when it shuts itself off (short maybe)?

idk what it is i wish i did

[Darkanion]

Since activating the driver's seat heater can turn off the passenger's side, that leaves me thinking there is a short somewhere on the driver's seat. I have no idea where, but I'd probably start by raising that driver's seat up as high as you can get it and look around under there for any exposed or crimped wires... Maybe they got caught in the track for the seat, as it moved back & forth..?

Edited by Darkanion, 26 December 2007 - 10:42 PM.

[M. Cueva]

made a few calls to some former co-workers and they said to pull the seat and look for rubbed wires, they dont necessarly get caught in the seat track, rather they can rub on themselves at times causing the jacket to wear down and causing a short in the wiring. I was also told to check the wires all the way back to the junction area (might have to pull up the carpet a little bit (a little work can go a long way).

[GMC04Z71]

alright thanks ill look at it and post what i found later tonight

[GMC04Z71]

it was the heated seat elements thanks for all the info

[Shawn Stuckey]

I am having the same issue on my 2003 Denali XL. What did you have to do to fix the problem?

[GMC04Z71]

hey man what you have to do is buy the heated seat element for the reclining part of the seat about 80bucks...(what i did i bought both elements to be on the safe side)...and i took it to the GM mechanic and he fixed it but when he got to taking out the other elements (b/c they have already been replaced one time, otherwise they just cut the wires on the original ones and put the new element on top) and when he got to taking out the element on the reclining part the was a burned hole in it about the size of your palm. if ya got ne more questions please feel free to ask...sry it took so long to reply

Edited by GMC04Z71, 13 January 2008 - 09:34 PM.

[04SilveradoLT]

Sorry for bring up an old post. My truck has the same issue. How hard is it to take apart the seat? Is it worth bring to the dealership? Also how come you bought the elements first? Thanks

[Tsmith]

"Condition/Concern:
Driver and passenger heated seats inoperative or shut off in 30 seconds."

The very thing going on with mine. Taking to dealer Friday morning ...

[04SilveradoLT]

Wow this is an old post. I fixed mine. The heating elements were shot. You could see where they burned up.

[Heysdad]

"Condition/Concern:
Driver and passenger heated seats inoperative or shut off in 30 seconds."

The very thing going on with mine. Taking to dealer Friday morning ...

LOL...I just had my Drivers side done last month for the same issue. The back only though. Bottom gets toasty....Back is not as hot...Oh well it works.