Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Heated Seats Schematics Connector End View Reference: Power Seat Connector End Views or Body Control System Connector End Views in Body Control System DEFINITION: This test assumes that a load shed level 1 or 2 heated seats is not enabled and that the heated seat inhibit is OFF. | ||||
1 | Did you review the power seat operation and perform the necessary inspections? | -- | Go to Step 2 | 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? | -- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 |
Does the voltage measure within the specified range? | 10-15 V | Go to Step 4 | Go to Step 24 |
4 | 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? | 10-15 V | Go to Step 5 | Go to Step 26 |
5 |
Does the voltage measure within the specified range? | 10-15 V | Go to Step 6 | Go to Step 25 |
6 |
Does the test lamp illuminate? | -- | Go to Step 13 | Go to Step 7 |
7 | Probe the heated seat high/low signal circuit of the heated seat module with a test lamp that is connected to battery positive voltage. Does the test lamp illuminate? | -- | Go to Step 17 | Go to Step 8 |
8 |
Does the test lamp illuminate? | -- | Go to Step 10 | Go to Step 9 |
9 |
Does the test lamp illuminate? | -- | Go to Step 27 | Go to Step 18 |
10 |
Does the resistance measure less than the specified value? | 10 ohms | Go to Step 11 | Go to Step 22 |
11 |
Does the resistance measure less than the specified value? | 10 ohms | Go to Step 12 | Go to Step 21 |
12 |
Important: The thermistor resistance varies according to the temperature. Therefore, if you measure the resistance while the seat is still warm, the resistance may vary outside of the specified range. With the seat at room temperature, measure the resistance between the temperature sensor signal circuit and the temperature sensor low reference circuit of the heated seat module connector. Does the resistance measure within the specified value? | 850-1150 ohms | Go to Step 14 | Go to Step 21 |
13 |
Did you find and correct the condition? | -- | Go to Step 33 | Go to Step 23 |
14 | Test the heated seat element supply voltage circuit and the heated seat element control circuit of the seat cushion heating element 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 33 | Go to Step 15 |
15 | Test the heated seat element supply voltage circuit and the heated seat element control circuit of the seat back heating element 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 33 | Go to Step 16 |
16 | Test the temperature sensor signal circuit of the temperature sensor for short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 33 | Go to Step 19 |
17 | Test the heated seat high/low signal circuit of the heated seat module 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 33 | Go to Step 20 |
18 | Test the ground 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? | -- | Go to Step 33 | Go to Step 20 |
19 | Inspect for poor connections at the harness connector of the heated seat 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 33 | Go to Step 31 |
20 | 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 33 | Go to Step 32 |
21 | Inspect for poor connections at the harness connector of the seat cushion heating element/temperature sensor. 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 33 | Go to Step 29 |
22 | Inspect for poor connections at the harness connector of the seat back heating element. 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 33 | Go to Step 28 |
23 | Inspect for poor connections at the harness connector of the rear integration 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 33 | 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 in Wiring Systems. Did you complete the repair? | -- | Go to Step 33 | -- |
25 | 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 33 | -- |
26 | 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 33 | -- |
27 | Repair the open in the high/low signal circuit of the heated seat module. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 33 | -- |
28 | Replace the seat back heating element. Refer to Driver Seat and Passenger Seat Back Cushion Heater Replacement . Did you complete the replacement? | -- | Go to Step 33 | -- |
29 | Replace the seat cushion heating element/temperature sensor. Refer to Driver Seat and Passenger Seat Cushion Heater Replacement . Did you complete the replacement? | -- | Go to Step 33 | -- |
30 | Replace the rear integration module. Refer to Rear Integration Body Control Module Replacement in Body Control Systems. Did you complete the replacement? | -- | Go to Step 33 | -- |
31 | Replace the heated seat module. Refer to Front Seat Heater Control Module Replacement . Did you complete the repair? | -- | Go to Step 33 | -- |
32 | Replace the heated seat switch. Refer to Front Seat Heater Switch Replacement . Did you complete the replacement? | -- | Go to Step 33 | -- |
33 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |
