Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Heated Seats Schematics | ||||
1 | Did you review the heated seat operation and perform the necessary inspection? | -- | 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 test lamp illuminate? | -- | Go to Step 9 | Go to Step 4 |
4 |
Does the test lamp illuminate? | -- | Go to Step 5 | Go to Step 24 |
5 | Connect a test lamp between the battery positive voltage circuit of the heated seat module connector to the ground circuit of the module connector. Does the test lamp illuminate? | -- | Go to Step 6 | Go to Step 25 |
6 |
Does the test lamp illuminate? | -- | Go to Step 8 | Go to Step 7 |
7 | Probe the battery positive voltage circuit of the heated seat switch with a test lamp that is connected to a good ground. Does the test lamp illuminate. | -- | Go to Step 19 | Go to Step 26 |
8 |
Important: If the resistance is measured with the seat still warm, the resistance may vary outside of the specified range since the thermister 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 heated seat module connector. Does the resistance measure within the specified range? | 850-11.50 K ohms | Go to Step 16 | Go to Step 14 |
9 |
Does the resistance measure less than the specified value? | 5 ohms | Go to Step 34 | Go to Step 10 |
10 | Measure the resistance between the heated seat element supply voltage circuit of the seat cushion heating element connector C 1 and the ground circuit of the heated seat module connector. Does the resistance measure less than the specified value? | 5 ohms | Go to Step 27 | Go to Step 11 |
11 | Measure the resistance between the heated seat element supply voltage circuit of the seat cushion heating element connector C 1 and the ground circuit of the seat back heating element connector C 4. Does the resistance measure less than the specified value? | 5 ohms | Go to Step 29 | Go to Step 12 |
12 |
Does the resistance measure less than the specified value for each heating element? | 5 ohms | Go to Step 13 | Go to Step 21 |
13 |
Does the resistance measure less than the specified value for each heating element? | 5 ohms | Go to Step 28 | Go to Step 22 |
14 | Test the temperature sensor signal circuit between the heated seat module and the 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 34 | Go to Step 15 |
15 | Test the temperature sensor ground circuit between the heated seat module and the 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 34 | Go to Step 21 |
16 | Test the temperature sensor signal circuit between the heated seat module and the 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 34 | Go to Step 17 |
17 | Test the temperature sensor signal circuit between the heated seat module and the temperature sensor 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 34 | Go to Step 18 |
18 | 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 34 | Go to Step 23 |
19 | Test the heated seat switch signal circuit between the heated seat switch and the heated seat module for a short to ground, a high resistance, or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 34 | 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 34 | Go to Step 30 |
21 | Inspect for poor connections at the harness connector of the heated seat cushion heating elements/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 34 | Go to Step 31 |
22 | Inspect for poor connections at the harness connector of the heated seat back heating elements. 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 34 | 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 34 | Go to Step 33 |
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 34 | -- |
25 | 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 34 | -- |
26 | Repair the open in the battery positive voltage circuit of the heated seat switch. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 34 | -- |
27 | Repair the open in the heated seat element supply voltage circuit between the heated seat module and the seat cushion heating element connector C 1. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 34 | -- |
28 | Repair the open in the heated seat element supply voltage circuit between the seat heating elements. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 34 | -- |
29 | Repair the open in the ground circuit of the seat heating elements. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 34 | -- |
30 | Replace the heated seat switch. Refer to Heated Seat Switch Replacement . Did you complete the replacement? | -- | Go to Step 34 | -- |
31 | Replace the faulty heat element. Refer to Bulletin 03-08-50-005. Did you complete the replacement? | -- | Go to Step 34 | -- |
32 | Replace the faulty heat element. Refer to Bulletin 03-08-50-005. Did you complete the replacement? | -- | Go to Step 34 | -- |
33 | Replace the heated seat module. Refer to Front Seat Heater Control Module Replacement . Did you complete the replacement? | -- | Go to Step 34 | -- |
34 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |
