Heated Seats Problem

[rap169]

Ok i know this is a truck forum, but i have an 01 pontiac grand prix with heated seats. The drivers side seat stopped working. Can anyone tell me some things to check on this? Is there a relay? Or seperate fuse for each side? the passenger side works fine. thanks

[bobcat5544]

Here is the flow chart to help verify the cause.

 

good luck

 

1

Did you review the Heated Seat System Description and Operation and perform the necessary inspections?

--

YES Go to Step 2

NO Go to Symptoms - Seats

 

2

Verify that the Heated Seat Inoperative complaint is present.

 

Does the heated seat system operate as described in the system description and operation?

--

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

NO Go to Step 3

 

3

Turn ON the ignition, with the engine OFF.

While observing the heated seat switch temperature indicators, place the heated seat switch in the HIGH and LOW positions.

Do the HI and LO temperature indicators illuminate?

--

YES Go to Step 4

NO Go to Step 18

 

4

Turn ON the ignition, with the engine OFF.

Probe the heated seat element supply voltage circuit of the heated seat module with a test lamp that is connected to a good ground.

Place the heated seat switch in the HIGH position.

Does the test lamp illuminate?

--

YES Go to Step 9

NO Go to Step 5

 

5

Turn Off the ignition.

Disconnect the heated seat module.

Turn ON the ignition, with the engine OFF.

Probe the battery positive voltage circuit of the heated seat module connector with a test lamp that is connected to a good ground.

Does the test lamp illuminate?

--

YES Go to Step 6

NO Go to Step 24

 

6

Connect a test lamp between the battery positive voltage circuit of the heated seat module connector and the ground circuit of the module connector.

 

Does the test lamp illuminate?

--

YES Go to Step 7

NO Go to Step 25

 

7

Probe the heated seat switch signal circuit of the heated seat module connector with a test lamp that is connected to a good ground.

Place the heated seat switch in the HIGH position.

Does the test lamp illuminate?

--

YES Go to Step 8

NO Go to Step 15

 

8

Important

If the resistance is measured with the seat still warm, the resistance may very outside of the specified range since the thermistor resistance varies with temperature.

 

Measure the resistance between the temperature sensor signal circuit of the heated seat module connector and the ground circuit of the module connector.

 

Does the resistance measure within the specified range?

7-11 K ohms

 

YES Go to Step 11

NO Go to Step 13

 

9

Disconnect the heated seat cushion heating element connector.

Measure the resistance across the cushion heating element connector.

Does the resistance measure less than the specified value?

5 ohms

YES Go to Step 10

NO Go to Step 21

 

10

Disconnect the heated seat back heating element connector.

Measure the resistance across the back heating element connector.

Does the resistance measure less than the specified value?

5 ohms

 

YES Go to Step 16

NO Go to Step 22

 

11

Test the signal circuit of the heated seat temperature sensor for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

 

Did you find and correct the condition?

--

YES Go to Step 31

NO Go to Step 12

 

12

Test the heated seat high/low signal circuit between the heated seat switch and the heated seat module for a short to battery voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

 

Did you find and correct the condition?

--

YES Go to Step 31

NO Go to Step 23

 

13

Test the ground circuit of the heated seat temperature sensor for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

 

Did you find and correct the condition?

--

YES Go to Step 31

NO Go to Step 14

 

14

Test the signal circuit of the heated seat temperature sensor for a short to battery voltage or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

 

Did you find and correct the condition?

--

YES Go to Step 31

NO Go to Step 21

 

15

Test the heated seat switch signal circuit between the heated seat switch and the heated seat module for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

 

Did you find and correct the condition?

--

YES Go to Step 31

NO Go to Step 20

 

16

Test the heated seat element supply voltage circuit between the heated seat module and the seat cushion heating element for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

 

Did you find and correct the condition?

--

YES Go to Step 31

NO Go to Step 17

 

17

Test the heated seat element supply voltage circuit between the seat heating elements for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

 

Did you find and correct the condition?

--

YES Go to Step 31

NO Go to Step 26

 

18

Test the battery positive voltage circuit of the heated seat switch for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

 

Did you find and correct the condition?

--

YES Go to Step 31

NO Go to Step 19

 

19

Test the ground circuit heated seat switch for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

 

Did you find and correct the condition?

--

YES Go to Step 31

NO Go to Step 20

 

20

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

 

Did you find and correct the condition?

--

YES Go to Step 31

NO Go to Step 27

 

21

Inspect for poor connections at the harness connector of the heated seat cushion heating element/temperature sensor. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems.

 

Did you find and correct the condition?

--

YES Go to Step 31

NO Go to Step 28

 

22

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

 

Did you find and correct the condition?

--

YES Go to Step 31

NO Go to Step 29

 

23

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

 

Did you find and correct the condition?

--

YES Go to Step 31

NO Go to Step 30

 

24

Repair the short to ground or open in the battery positive voltage circuit of the heated seat module. Refer to Wiring Repairs or Connector Repairs in Wiring Systems.

 

Did you complete the repair?

--

YES Go to Step 31

--

 

25

Repair the open in the ground circuit of the heated seat module. Refer to Wiring Repairs or Connector Repairs in Wiring Systems.

 

Did you complete the repair?

--

YES Go to Step 31

--

 

26

Repair the open in the ground circuit of the seat heating elements. Refer to Wiring Repairs or Connector Repairs in Wiring Systems.

 

Did you complete the repair?

--

YES Go to Step 31

--

 

27

Replace the heated seat switch. Refer to Heated Seat Switch Replacement .

 

Is the repair complete?

--

YES Go to Step 30

--

 

28

Replace the seat cushion heater element/temperature sensor. Refer to Seat Heater Element Replacement - Front .

 

Is the repair complete?

--

YES Go to Step 31

--

 

29

Replace the seat back heater element. Refer to Seat Heater Element Replacement - Front .

 

Is the repair complete?

--

YES Go to Step 31

--

 

30

Replace the heated seat control module. Refer to Heated Seat Control Module Replacement - Front .

 

Is the repair complete?

--

YES Go to Step 31

--

 

31

Operate the system in order to verify the repair.

 

Did you correct the condition?

--

YES System OK

NO Go to Step 2

[alvocado]

This is helpful. My drivers side heated seat has been non-functional for 2 years. However, when I look under the seat, I'm not familiar with the modules and terminals and there isn't much room to really investigate. Do you know where I can find a diagram defining the components? Also, can the diagnosis generally be done without removing the seat?