Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Driver Seat Schematics or Passenger Seat Schematics Connector End View Reference: Power Seat Connector End Views DEFINITION: This test assumes that load shed level 1 or 2 heated seats is not enabled. | ||||
1 | Did you review the Heated 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 | Are both the heated seat cushion and seat back inoperative? | -- | Go to Step 5 | Go to Step 4 |
4 | Is the heated seat cushion inoperative? | -- | Go to Step 16 | Go to Step 17 |
5 |
Does the voltage measure within the specified range? | 9-15 V | Go to Step 6 | Go to Step 30 |
6 | Measure the voltage from the battery positive voltage circuit of the heated seat module to the ground circuit of the heated seat module. Does the voltage measure within the specified range? | 9-15 V | Go to Step 7 | Go to Step 31 |
7 |
Does the voltage measure within the specified range? | 9-15 V | Go to Step 8 | Go to Step 32 |
8 | Probe the heated seat control module inhibit 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 20 | Go to Step 9 |
9 |
Does the test lamp illuminate? | -- | Go to Step 34 | Go to Step 10 |
10 | 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 22 | Go to Step 11 |
11 |
Does the test lamp illuminate? | -- | Go to Step 13 | Go to Step 12 |
12 |
Does the test lamp illuminate? | -- | Go to Step 33 | Go to Step 23 |
13 | Probe the heated seat off 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 21 | Go to Step 14 |
14 |
Does the resistance measure less than the specified value? | 5 ohms | Go to Step 15 | Go to Step 35 |
15 |
Important: If the resistance is measured with the seat still warm, the resistance may vary outside of the specified range since the thermistor resistance varies with temperature. Measure the resistance between the temperature sensor signal circuit and the sensor low reference circuit of the heated seat module connector. Does the resistance measure within the specified range? | 850-11,500 ohms | Go to Step 18 | Go to Step 24 |
16 |
Does the resistance measure less than the specified value? | 8 ohms | Go to Step 35 | Go to Step 25 |
17 |
Does the resistance measure less than the specified value? | 8 ohms | Go to Step 35 | Go to Step 26 |
18 | Test the temperature sensor signal circuit 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 41 | Go to Step 19 |
19 | Test the heated seat element control circuit of the seat heating elements for a short to battery voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 41 | Go to Step 27 |
20 | Test the heated seat control module inhibit signal circuit between the heated seat module and the HVAC control 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 41 | Go to Step 28 |
21 | Test the heated seat off signal circuit between the heated seat module and the heated seat switch 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 41 | Go to Step 29 |
22 | Test the heated seat high/low signal circuit between the heated seat module and the heated seat switch 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 41 | Go to Step 29 |
23 | 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 41 | Go to Step 29 |
24 | Test the signal circuit and the low reference circuit of the heated seat temperature sensor for a short to battery voltage and an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 41 | Go to Step 25 |
25 | Inspect for poor connections at the harness connector of the heated 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 41 | Go to Step 36 |
26 | Inspect for poor connections at the harness connector of the heated 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 41 | Go to Step 37 |
27 | 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 41 | Go to Step 38 |
28 | Inspect for poor connections at the harness connector of the HVAC control 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 41 | Go to Step 39 |
29 | 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 41 | Go to Step 40 |
30 | 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 41 | -- |
31 | 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 41 | -- |
32 | Repair the short to ground or open in the ignition 1 voltage circuit of the heated seat module. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 41 | -- |
33 | Repair the open in the heated seat high/low signal circuit of the heated seat module. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 41 | -- |
34 | Repair the short to voltage in the heated seat high/low signal circuit of the heated seat module. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 41 | -- |
35 | Repair the open in the supply voltage circuit or the control circuit of the seat heating elements. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 41 | -- |
36 | Replace the heated seat cushion heating element/temperature sensor. Refer to Driver Seat and Passenger Seat Cushion Heater Replacement . Did you complete the replacement? | -- | Go to Step 41 | -- |
37 | Replace the heated seat back heating element. Refer to Driver Seat and Passenger Seat Back Cushion Heater Replacement . Did you complete the replacement? | -- | Go to Step 41 | -- |
38 | Replace the heated seat module. Refer to Front Seat Heater Control Module Replacement . Did you complete the replacement? | -- | Go to Step 41 | -- |
39 | Replace the HVAC control module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 41 | -- |
40 | Replace the heated seat switch. Refer to Heated Seat Switch Replacement . Did you complete the replacement? | -- | Go to Step 41 | -- |
41 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |
