GM Service Manual Online
For 1990-2009 cars only

Step

Action

Values

Yes

No

Schematic Reference: Heated Seats Schematics

1

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

--

Go to Step 2

Go to Symptoms - Seats

2

Operate the heated seat system.

Does the system operate normally?

--

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

Go to Step 3

3

  1. Turn ON the ignition, with the engine OFF.
  2. Backprobe the heated seat switch signal circuit terminal in the power seat inline harness connector with a DMM.
  3. Measure the voltage while activating the heated seat switch in the high and low modes.

Is the measured voltage within the specified value while the switch is activated in the high and low modes?

6-12 V

Go to Step 4

Go to Step 6

4

Connect a test lamp from the battery voltage supply circuit 2340 terminal in the body harness connector half to a good ground.

Does the test lamp illuminate?

--

Go to Step 5

Go to Step 13

5

Connect a test lamp from battery voltage to the ground circuit terminal in the body harness connector half.

Does the test lamp illuminate?

--

Go to Step 9

Go to Step 14

6

  1. Disconnect the heated seat switch connector.
  2. Connect a test lamp from the ignition voltage supply circuit terminal in the harness connector to a good ground.

Does the test lamp illuminate?

--

Go to Step 7

Go to Step 15

7

Connect a test lamp from battery voltage to the ground circuit terminal in the heated seat switch harness connector.

Does the test lamp illuminate?

--

Go to Step 8

Go to Step 16

8

Test the heated seat switch signal circuit for a open or short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 20

Go to Step 11

9

  1. Disconnect the power seat harness to seat cushion heater element assembly 3 way connector.
  2. Test the following circuits in the power seat harness for an open or short to ground:
  3. • Battery voltage supply circuit 2340
    • Heated seat switch signal circuit
    • Heated seat ground circuit

Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 20

Go to Step 10

10

  1. Disconnect the seat back heater element connector.
  2. Measure the resistance through the seat back heater element.

Is the resistance within the specified values?

0.5-2.0 ohms

Go to Step 12

Go to Step 17

11

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

Did you find and correct the condition?

--

Go to Step 20

Go to Step 18

12

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

Did you find and correct the condition?

--

Go to Step 20

Go to Step 19

13

Repair the heated seat battery voltage supply circuit for an open or short to ground. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 20

--

14

Repair the heated seat ground circuit for an open or high resistance. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 20

--

15

Repair the heated seat switch ignition voltage supply circuit for an open or short to ground. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 20

--

16

Repair the heated seat switch ground circuit for an open or high resistance. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 20

--

17

Replace the seat back heater element. Refer to Driver Seat and Passenger Seat Back Cushion Heater Replacement .

Did you complete the repair?

--

Go to Step 20

--

18

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

Did you complete the repair?

--

Go to Step 20

--

19

Replace the seat cushion heater element assembly. Refer to and Driver Seat and Passenger Seat Cushion Heater Replacement .

Did you complete the repair?

--

Go to Step 20

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20

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 2