Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Heated Seats Schematics | ||||
1 | Did you review the Heated Seat System Description and 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 |
Do the HI and LO temperature indicators illuminate? | -- | Go to Step 4 | Go to Step 18 |
4 |
Does the test lamp illuminate? | -- | Go to Step 9 | Go to Step 5 |
5 |
Does the test lamp illuminate? | -- | Go to Step 6 | 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? | -- | Go to Step 7 | Go to Step 25 |
7 |
Does the test lamp illuminate? | -- | Go to Step 8 | 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 | Go to Step 11 | Go to Step 13 |
9 |
Does the resistance measure less than the specified value? | 5 ohms | Go to Step 10 | Go to Step 21 |
10 |
Does the resistance measure less than the specified value? | 5 ohms | Go to Step 16 | 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? | -- | Go to Step 31 | 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? | -- | Go to Step 31 | 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? | -- | Go to Step 31 | 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? | -- | Go to Step 31 | 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? | -- | Go to Step 31 | 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? | -- | Go to Step 31 | 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? | -- | Go to Step 31 | 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? | -- | Go to Step 31 | 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? | -- | Go to Step 31 | Go to Step 20 |
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 31 | 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 Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 31 | 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 Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 31 | Go to Step 29 |
23 | 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 31 | 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? | -- | 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? | -- | 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? | -- | Go to Step 31 | -- |
27 | Replace the heated seat switch. Refer to Heated Seat Switch Replacement . Is the repair complete? | -- | Go to Step 30 | -- |
28 | Replace the seat cushion heater element/temperature sensor. Refer to Front Seat Heater Element Replacement . Is the repair complete? | -- | Go to Step 31 | -- |
29 | Replace the seat back heater element. Refer to Front Seat Heater Element Replacement . Is the repair complete? | -- | Go to Step 31 | -- |
30 | Replace the heated seat control module. Refer to Front Seat Heater Control Module Replacement . Is the repair complete? | -- | Go to Step 31 | -- |
31 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |
