GMC Repair: Heated seat failure on 01 Buick LeSabre, seat failure, gmc suburban

Question
Have 2001 Buick LeSabre. Drivers heated seat doesn't heat.  Accessory fuses are fine. No loose, broken wires under seat. Seat switch module cycles from HI to LO to OFF. Would the diagnostics be the same as for the 99 gmc suburban already posted? How do i replace the seat or back heating element?


Answer
Hi
No the diagnostics is NOT the same.
Here is the procedure.
It is VERY long and fairly technical. You'll also need access to a scan tool.

.

1
Did you perform the Diagnostic System Check-Power Seat Systems?
--
Go to Step 2
Go to Diagnostic System Check - Power Seat Systems

2
Verify that the Heated Seat Inoperative complaint is present.

Does the heated seat system operate as described in the system description and operation?
--
Go to Testing for Intermittent and Poor Connections in Wiring Systems
Go to Step 3

3
Install a scan tool.
Turn ON the ignition, with the engine OFF.
With a scan tool, observe the Heated Seat Switch parameter in the Driver Door Module data list.
Press the heated seat switch.
Does the Heated Seat Switch parameter change state?
--
Go to Step 6
Go to Step 4

4
Disconnect the heated seat switch harness connector.
Connect a 3-amp fused jumper from the heated seat switch signal circuit of the switch connector to a good ground.
With a scan tool, observe the Heated Seat Switch parameter.
Does the Heated Seat Switch parameter change state?
--
Go to Step 5
Go to Step 14

5
Connect a 3-amp fused jumper between the heated seat switch signal circuit of the switch connector and the ground circuit of the switch connector.
With a scan tool, observe the Heated Seat Switch parameter.
Does the Heated Seat Switch parameter change state?
--
Go to Step 19
Go to Step 25

6
Turn OFF the ignition.
Disconnect the heated seat module connector C1.
Measure the voltage from the battery positive voltage circuit of the heated seat module connector to a good ground.
Does the voltage measure within the specified range?
9-16 V
Go to Step 7
Go to Step 26

7
Measure the voltage from the battery positive voltage circuit of the heated seat module connector to the ground circuit of the heated seat module connector.

Does the voltage measure within the specified range?
9-16 V
Go to Step 8
Go to Step 28

8
Turn ON the ignition, with the engine OFF.
Measure the voltage from the ignition 3 voltage circuit of the heated seat module connector to a good ground.
Does the voltage measure within the specified range?
9-16 V
Go to Step 9
Go to Step 27

9
Turn OFF the ignition.
Connect the heated seat module connector C1.
Turn ON the ignition, with the engine OFF.
Measure the voltage from the heated seat high/low signal circuit of the heated seat module to a good ground.
Does the voltage measure within the specified range?
4.50-5.50 V
Go to Step 10
Go to Step 15

10
While measuring the voltage from the heated seat high/low signal circuit of the heated seat module, press the heated seat switch.

Does the measured voltage change state?
--
Go to Step 11
Go to Step 16

11
Disconnect the heated seat module harness connector C2.
Measure the resistance between the heated seat element supply voltage circuit and the element control circuit of the module connector.
Does the resistance measure less than the specified value?
5 ohms
Go to Step 13
Go to Step 12

12
Disconnect the heated seat back heating element connector.
Measure the resistance between the heated seat element supply voltage circuit and the element control circuit of the seat back heating element connector.
Does the resistance measure less than the specified value?
5 ohms
Go to Step 22
Go to Step 21

13

Important
If the resistance is measured with the seat still warm, the resistance may vary within the specified range depending on the temperature of the seat.


Measure the resistance between the temperature sensor signal circuit and the sensor low reference circuit of the temperature sensor connector.

Does the resistance measure within the specified range?
280 ohms -300 K ohms
Go to Step 17
Go to Step 22

14
Test the heated seat switch signal circuit between the heated seat switch and the door control module for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?
--
Go to Step 35
Go to Step 23

15
Test the heated seat high/low signal circuit between the rear integration module and the heated seat module 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 35
Go to Step 20

16
Test the heated seat high/low signal circuit between the rear integration module 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?
--
Go to Step 35
Go to Step 24

17
Test the element control ground circuit of the heating elements for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?
--
Go to Step 35
Go to Step 18

18
Test the temperature sensor signal circuit of the temperature sensor for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?
--
Go to Step 35
Go to Step 20

19
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?
--
Go to Step 35
Go to Step 29

20
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?
--
Go to Step 35
Go to Step 30

21
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?
--
Go to Step 35
Go to Step 31

22
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?
--
Go to Step 35
Go to Step 32

23
Inspect for poor connections at the harness connector of the door control module. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?
--
Go to Step 35
Go to Step 33

24
Inspect for poor connections at the harness connector of the rear integration module. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?
--
Go to Step 35
Go to Step 34

25
Repair the open in the ground circuit of the heated seat switch. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?
--
Go to Step 35
--

26
Repair the short to ground or open in the battery positive voltage circuit of the heated seat module. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?
--
Go to Step 35
--

27
Repair the open in the ignition 3 voltage circuit of the heated seat module. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?
--
Go to Step 35
--

28
Repair the open in the ground circuit of the heated seat module. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?
--
Go to Step 35
--

29
Replace the heated seat switch. Refer to Heated Seat Switch Replacement .

Did you complete the replacement?
--
Go to Step 35
--

30
Replace the heated seat module. Refer to Heated Seat Control Module Replacement - Front .

Did you complete the replacement?
--
Go to Step 35
--

31
Replace the heated seat back heating element. Refer to Seat Heater Element Replacement - Front .

Did you complete the replacement?
--
Go to Step 35
--

32
Replace the heated seat cushion heating element/temperature sensor. Refer to Seat Heater Element Replacement - Front .

Did you complete the replacement?
--
Go to Step 35
--

33
Replace the door control module. Refer to Door Control Module Replacement in Doors.

Did you complete the replacement?
--
Go to Step 35
--

34
Replace the rear integration module. Refer to Rear Integration Module Replacement in Body Control System.

Did you complete the replacement?
--
Go to Step 35
--

35
Operate the system in order to verify the repair.

Did you correct the condition?
--
System OK
Go to Step 2

Hope this helps
Pawl