GM Service Manual Online
For 1990-2009 cars only
    • Refer to

LH Front Heated Seats (Partial)


Object Number: 492349  Size: FS
Power Seat Systems Components
Heated Seats Circuit Description
LH Front Heated Seats (Partial)
Handling ESD Sensitive Parts Notice
    • Refer to

RH Front Heated Seats (Partial)


Object Number: 492355  Size: FS
Power Seat Systems Components
Heated Seats Circuit Description
RH Front Heated Seats (Partial)
LH Front Heated Seats (Partial)
Handling ESD Sensitive Parts Notice
    • Refer to

LH Rear Heated Seats (Partial)


Object Number: 492369  Size: FS
Power Seat Systems Components
Heated Seats Circuit Description
LH Rear Heated Seats (Partial)
RH Front Heated Seats (Partial)
Handling ESD Sensitive Parts Notice
    • Refer to

RH Rear Heated Seats (Partial)


Object Number: 492359  Size: FS
Power Seat Systems Components
Heated Seats Circuit Description
RH Rear Heated Seat
LH Rear Heated Seats (Partial)
Handling ESD Sensitive Parts Notice

Circuit Description

The heated seat mode switch is normally open. When the mode switch pressed, it momentarily switches a battery positive voltage (B+) to the mode input of the door module. The door module then momentarily grounds the mode input of the heated seat module. The heated seat module examines the input to determine the change in the heated seat mode.

Conditions for Running the DTC

The door module must be powered and can not have B1328-Battery Voltage High or B1327-Battery Voltage Low set as an active DTC for this DTC to set.

Conditions for Setting the DTC

If the door module detects that a heated seat switch input circuit is shorted to battery positive (B+) for 30 continuous seconds, the switch will be considered shorted and the DTC will set.

Action Taken When the DTC Sets

After the initial heated seat activation, no other heated seat switch activations shall be recognized as a result of this switch input staying active (shorted to voltage).

Conditions for Clearing the DTC

The DTC automatically clears when the switch circuit setting the DTC is no longer active.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. Checks the existing state of the heated seat mode BACK ONLY switch by using the current state of the input parameter.

Step

Action

Value(s)

Yes

No

1

Did you perform the Diagnostic System Check - Power Seat Systems?

--

Go to Step  2

Go to Diagnostic System Check - Power Seat Systems

2

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the Heated Seat Mode parameter in the Door Module data list.

Does the scan tool display OFF?

--

Go to Step  3

Go to Step  4

3

  1. Activate the heated seat BACK ONLY switch.
  2. With a scan tool, observe the Heated Seat Mode parameter.

Does the Heated Seat Mode parameter change state?

--

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step  4

4

  1. Turn OFF the ignition.
  2. Disconnect the heated seat switch connector.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the Heated seat Mode parameter.

Does the scan tool display OFF?

--

Go to Step  7

Go to Step  5

5

Test the back only mode input circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step  10

Go to Step  6

6

Inspect for poor connections at the harness connector of the door module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step  10

Go to Step  8

7

Inspect for poor connections at the harness connector of the heated seat switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step  10

Go to Step  9

8

Replace the door module. Refer to Door Control Module Replacement in Doors.

Did you complete the replacement?

--

Go to Step  10

--

9

Replace the heated seat switch. Refer to Front Seat Heater Switch Replacement or Rear Seat Heater Switch Replacement .

Did you complete the replacement?

--

Go to Step  10

--

10

  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

--

Go to Step  2

System OK