Test Description
The numbers below refer to the step numbers on the diagnostic table.
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This step tests the integrity of the heated seat switch signal from the rear integration module. This signal is a momentary 35 millisecond one shot pulse signal that is monitored through a momentary voltage change in the volt meter when the switch is pressed. In order to accurately recognize the change in voltage, the volt meter reading should be stable before performing this test.
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This step tests the integrity of the heated seat inhibit signal circuit from the rear integration module. Do not proceed with this test if the heated seat load shed level 1 or 2 heated seats is enabled.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Heated Seats Schematics Connector End View Reference: Power Seat Connector End Views or Power Door Systems Connector End Views in Doors DEFINITION: This test assumes that load shed level 1 or 2 heated seats is not enabled, and that heated seats inhibit is off. | ||||
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 scan tool display ON? | -- | Go to Step 4 | Go to Step 13 |
4 | Measure the voltage from the battery positive voltage circuit of the heated seat module to a good ground. Does the voltage measure within the specified range? | 10-15 V | Go to Step 5 | Go to Step 33 |
5 | 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? | 10-15 V | Go to Step 6 | Go to Step 35 |
6 | Measure the voltage from the Ign 3 voltage circuit of the heated seat module to a good ground. Does the voltage measure within the specified range? | 10-15 V | Go to Step 7 | Go to Step 34 |
Activate the heated seat switch. Does the measured voltage momentarily change state? | -- | Go to Step 9 | Go to Step 8 | |
8 |
Does the voltage measure within the specified range? | 4.50-5.50 V | Go to Step 32 | Go to Step 18 |
Does the resistance measure less than the specified value? | 10 ohms | Go to Step 26 | Go to Step 10 | |
10 |
Does the resistance measure less than the specified value? | 6 ohms | Go to Step 11 | Go to Step 17 |
11 |
Does the resistance measure less than the specified value? | 6 ohms | Go to Step 12 | Go to Step 29 |
12 |
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 signal circuit of the temperature sensor and the low reference circuit of the temperature sensor. Does the resistance measure within the specified value? | 850 ohms - 1150 K ohms | Go to Step 20 | Go to Step 16 |
13 |
Does the test lamp illuminate? | -- | Go to Step 31 | Go to Step 14 |
14 | Test the heated seat switch signal circuit between the heated seat switch and the door module 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 42 | Go to Step 15 |
15 | Test the ground circuit of the heated seat switch for 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 42 | Go to Step 27 |
16 | Test the temperature sensor signal circuit and the sensor low reference circuit between the heated seat module and the temperature sensor for 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 42 | Go to Step 25 |
17 | Test the element supply voltage circuit and the element control circuit between the heated seat module and the seat cushion heating element for 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 42 | |
18 | Test the rear heated seat switch signal circuit between the heated seat module and the rear integration module for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 42 | Go to Step 19 |
19 | Test the rear heated seat switch signal circuit between the heated seat module and the rear integration module for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 42 | Go to Step 28 |
20 | Test the element supply voltage circuit and the element control circuit between the heated seat module and 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 42 | Go to Step 21 |
21 | Test the element supply voltage circuit and the element control circuit between the heated seat module and the seat cushion heating element for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 42 | Go to Step 22 |
22 | Test the element supply voltage circuit and the element control circuit between the heated seat module and 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 42 | Go to Step 23 |
23 | Test the element supply voltage circuit and the element control circuit between the heated seat module and the seat back heating element for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 42 | Go to Step 24 |
24 | 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 42 | Go to Step 28 |
25 | Test the temperature sensor signal circuit between the heated seat module and the temperature sensor for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 42 | Go to Step 30 |
26 | 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 42 | Go to Step 32 |
27 | Inspect for poor connections at the harness connector of the heated seat switch. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 42 | Go to Step 36 |
28 | 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 42 | Go to Step 37 |
29 | 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 42 | Go to Step 38 |
30 | Inspect for poor connections at the harness connector of the seat cushion heating element and 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 42 | Go to Step 39 |
31 | Inspect for poor connections at the harness connector of the door 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 42 | Go to Step 40 |
32 | 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 42 | Go to Step 41 |
33 | 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 42 | -- |
34 | Repair the open in the IGN 3 voltage circuit of the heated seat module. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 42 | -- |
35 | 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 42 | -- |
36 | Replace the heated seat switch. Refer to Rear Seat Heater Switch Replacement . Did you complete the replacement? | -- | Go to Step 42 | -- |
37 | Replace the heated seat module. Refer to Rear Seat Heater Control Module Replacement . Did you complete the replacement? | -- | Go to Step 42 | -- |
38 | Replace the seat back heating element. Refer to Rear Seat Back Cushion Cover and Pad Replacement . Did you complete the replacement? | -- | Go to Step 42 | -- |
39 | Replace the seat cushion heating element/temperature sensor. Refer to Rear Seat Cushion Cover and Pad Replacement . Did you complete the replacement? | -- | Go to Step 42 | -- |
40 | Replace the door module. Refer to Door Control Module Replacement in Doors. Did you complete the replacement? | -- | Go to Step 42 | -- |
41 | 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 42 | -- |
42 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |
