Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Heated Seats Schematics Connector End View Reference: Power Seat Connector End Views or Body Control System Connector End Views in Body Control System 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 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 Pressed? | -- | Go to Step 4 | Go to Step 21 |
4 |
Does the voltage measure within the specified range? | 10-15 V | Go to Step 5 | Go to Step 22 |
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 24 |
6 | Measure the voltage from the ignition 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 23 |
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 20 | Go to Step 15 |
9 |
Does the resistance measure less than the specified value? | 6 ohms | Go to Step 11 | Go to Step 10 |
10 |
Does the resistance measure less than the specified value? | 6 ohms | Go to Step 19 | Go to Step 18 |
11 |
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 range? | 850 ohms - 1150 K ohms | Go to Step 12 | Go to Step 19 |
12 | 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 30 | |
13 | 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 30 | Go to Step 14 |
14 | 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 30 | Go to Step 17 |
15 | Test the heated seat high/low signal circuit between the rear integration module and the heated seat 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 30 | Go to Step 16 |
16 | Test the heated seat high/low signal circuit between the rear integration module and the heated seat 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 30 | Go to Step 17 |
17 | 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 30 | Go to Step 25 |
18 | 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 30 | Go to Step 26 |
19 | 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 30 | Go to Step 27 |
20 | Inspect for poor connections at the harness connector of the rear integration module (RIM). 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 30 | Go to Step 28 |
21 | Inspect for poor connections at the harness connector of the HVAC control module. 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 30 | Go to Step 29 |
22 | 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 30 | -- |
23 | 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 30 | -- |
24 | 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 30 | -- |
25 | Replace the heated seat module. Refer to Front Seat Heater Control Module Replacement . Did you complete the replacement? | -- | Go to Step 30 | -- |
26 | Replace the seat back heating element. Refer to Driver Seat and Passenger Seat Back Cushion Heater Replacement . Did you complete the replacement? | -- | Go to Step 30 | -- |
27 | Replace the seat cushion heating element/temperature sensor. Refer to Driver Seat and Passenger Seat Cushion Heater Replacement . Did you complete the replacement? | -- | Go to Step 30 | -- |
28 |
Important: After replacement of the RIM perform the set up procedure for the RIM. Refer to Body Control Module (BCM) Programming/RPO Configuration 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 30 | -- |
29 | Replace the HVAC control module. Refer to HVAC Control Module Replacement in HVAC Systems-Automatic. Did you complete the replacement? | -- | Go to Step 30 | -- |
30 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |
