Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Heated Seats 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 |
Does the voltage measure within the specified range? | 9-15 V | Go to Step 4 | Go to Step 26 |
4 | 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 5 | Go to Step 29 |
5 |
Does the voltage measure within the specified range? | 9-15 V | Go to Step 6 | Go to Step 27 |
6 | Connect a test lamp from the heated seat high/low signal circuit of the heated seat module to a good ground. Does the test lamp illuminate? | -- | Go to Step 30 | Go to Step 7 |
7 | Connect a test lamp from battery positive voltage to the heated seat high/low signal circuit of the heated seat module. Does the test lamp illuminate? | -- | Go to Step 20 | Go to Step 8 |
8 | With the test lamp still connected from battery positive voltage to the heated seat high/low signal circuit of the heated seat module, activate the heated seat HI/LO switch. Does the test lamp illuminate? | -- | Go to Step 10 | Go to Step 9 |
9 |
Does the test lamp illuminate? | -- | Go to Step 28 | Go to Step 19 |
10 | Connect a test lamp from battery positive voltage to the heated seat off signal circuit of the heated seat module. Does the test lamp illuminate? | -- | Go to Step 17 | Go to Step 11 |
11 | Connect a test lamp from battery positive voltage to the inhibit signal circuit of the heated seat module. Does the test lamp illuminate? | -- | Go to Step 18 | Go to Step 12 |
12 |
Does the resistance measure less than the specified value? | 5 ohms | Go to Step 14 | Go to Step 13 |
13 |
Does the resistance measure less than the specified value? | 5 ohms | Go to Step 21 | Go to Step 22 |
14 |
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 15 | Go to Step 21 |
15 | 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 36 | Go to Step 16 |
16 | Test the heated seat element control circuit of the seat 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 36 | Go to Step 23 |
17 | 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 36 | Go to Step 25 |
18 | Test the heated seat control module inhibit signal circuit between the heated seat module and the rear integration 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 36 | Go to Step 24 |
19 | 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 36 | Go to Step 25 |
20 | 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 36 | Go to Step 25 |
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 36 | Go to Step 31 |
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 36 | Go to Step 32 |
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 36 | Go to Step 33 |
24 | 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 36 | Go to Step 34 |
25 | 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 36 | 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 36 | -- |
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 36 | -- |
28 | 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 36 | -- |
29 | 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 36 | -- |
30 | 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 36 | -- |
31 | Replace the heated seat cushion heating element/temperature sensor. Refer to Front Seat Heater Element Replacement . Did you complete the replacement? | -- | Go to Step 36 | -- |
32 | Replace the heated seat back heating element. Refer to Front Seat Heater Element Replacement . Did you complete the replacement? | -- | Go to Step 36 | -- |
33 | Replace the heated seat module. Refer to Front Seat Heater Control Module Replacement . Did you complete the replacement? | -- | Go to Step 36 | -- |
34 | Replace the rear integration module. Refer to Rear Integration Body Control Module Replacement in Body Control System. Did you complete the replacement? | -- | Go to Step 36 | -- |
35 | Replace the heated seat switch. Refer to Heated Seat Switch Replacement . Did you complete the replacement? | -- | Go to Step 36 | -- |
36 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |
