Diagnostic Aids
In order to perform valid tests when diagnosing the climate control seat system, the ignition must be cycled OFF then ON between each test in order to reset the climate control seat module.
A short to ground in the heated/cool ventilation module HEAT control circuit will open the HTDST fuse when the heat mode is selected, and the heat mode will be inoperative. However, when the COOL mode is selected, the system will operate normally.
A short to ground in the heated/cool ventilation module COOL control circuit will open the HTDST fuse when the cool mode is selected and the system will be inoperative. However, when the HEAT mode is selected, the system operate normally.
Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Heated/Cooled Seat Schematics Connector End View Reference: Heated/Cooled Seat Connector End Views DEFINITION: This diagnostic table is used to diagnosis the heat and cool seat modes. | ||||
1 | Did you review the heated/cooled seat operation and perform the necessary inspections? | -- | Go to Step 2 | |
2 | Verify that the Heated/Cooled Seat Inoperative complaint is present. Does the heated/cool seat system operate as described in the system description and operation? | -- | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 |
Does the blower motor operate for approximately 4-60 seconds then shut down? | -- | Go to Step 12 | Go to Step 4 | |
4 |
Does the voltage measure within the specified range? | 9-16 V | Go to Step 5 | Go to Step 39 |
5 | Measure the voltage from the battery positive voltage circuit of the climate control seat module to the ground circuit of the climate control seat module. Does the voltage measure within the specified range? | 9-16 V | Go to Step 6 | Go to Step 40 |
6 |
Does the voltage measure within the specified range? | 9-16 V | Go to Step 7 | Go to Step 41 |
7 |
Does the voltage measure near the specified value? | 12 V | Go to Step 8 | Go to Step 17 |
8 | While measuring the voltage from the HVAC heated/cool seat mode signal circuit of the climate control seat module, press the heated/cool seat switch. Does the measured voltage change state? | -- | Go to Step 9 | Go to Step 18 |
9 |
Does the voltage measure within the specified range? | 6-12 V | Go to Step 10 | Go to Step 22 |
10 |
Does the voltage measure within the specified range? | 1.5-12.0 V | Go to Step 11 | Go to Step 20 |
11 |
Does the voltage measure within the specified range? | 1.5-12.0 V | Go to Step 31 | Go to Step 21 |
12 |
Measure the voltage from the tach signal circuit of the blower motor to a good ground. Does the voltage measure within the specified range? | 4-16 V | Go to Step 13 | Go to Step 23 |
13 |
Does the resistance measure within the specified range? | 63-18,000 ohms | Go to Step 14 | Go to Step 25 |
14 | Measure the resistance between the ventilation module heat control circuit and the ventilation module cool control circuit of the seat cushion ventilation module. Does the resistance measure less than the specified value? | 7.5 ohms | Go to Step 15 | Go to Step 27 |
15 | Measure the resistance between the temperature sensor signal circuit and the low reference circuit of the seat back temperature sensor. Does the resistance measure within the specified range? | 63-18,000 ohms | Go to Step 16 | Go to Step 26 |
16 | Measure the resistance between the ventilation module heat control circuit and the ventilation module cool control circuit of the seat back ventilation module. Does the resistance measure less than the specified value? | 7.5 ohms | Go to Step 24 | Go to Step 28 |
17 | Test the HVAC heated/cooled seat mode signal circuit between the HVAC control module and the climate control seat module for a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 47 | Go to Step 36 |
18 | Test the HVAC heated/cool seat mode signal circuit between the HVAC control module and the climate control seat module for an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 47 | Go to Step 19 |
19 | Test the HVAC heated/cooled seat mode signal circuit between the HVAC control module and the climate control seat module for a short to battery voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 47 | Go to Step 38 |
20 | Test the speed control circuit of the blower motor for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 47 | Go to Step 36 |
21 | Test the low reference circuit of the blower motor for an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 47 | Go to Step 36 |
22 | Test the voltage reference circuit of the blower motor for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 47 | Go to Step 36 |
23 | Test the tach signal circuit of the blower motor for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 47 | Go to Step 36 |
24 | Test the tach signal circuit of the blower motor for a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 47 | Go to Step 29 |
25 | Test the temperature sensor signal circuit and the low reference circuit of the seat cushion temperature sensor for an open. Refer to Circuit Testing and Wiring Repairs Did you find and correct the condition? | -- | Go to Step 47 | Go to Step 32 |
26 | Test the temperature sensor signal circuit and the low reference circuit of the seat back temperature sensor for an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 47 | Go to Step 33 |
27 | Test the ventilation module heat control circuit and the ventilation module cool control circuit of the seat cushion ventilation module for an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 47 | Go to Step 34 |
28 | Test the ventilation module heat control circuit and the ventilation module cool control circuit of the seat back ventilation module for an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 47 | Go to Step 35 |
29 | Test the temperature sensor signal circuit of the seat cushion temperature sensor for a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 47 | Go to Step 30 |
30 | Test the temperature sensor signal circuit of the seat back temperature sensor for a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 47 | Go to Step 36 |
31 | Test the speed control circuit of the blower motor for a short to battery voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 47 | Go to Step 37 |
32 | Test the temperature sensor signal circuit of the seat cushion temperature sensor for a short to battery voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 47 | Go to Step 34 |
33 | Test the temperature sensor signal circuit of the seat back temperature sensor for a short to battery voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 47 | Go to Step 35 |
34 | Inspect for poor connections at the harness connector of the seat cushion heated/cool ventilation module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 47 | Go to Step 42 |
35 | Inspect for poor connections at the harness connector of the seat back heated/cool ventilation module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 47 | Go to Step 43 |
36 | Inspect for poor connections at the harness connector of the climate control seat module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 47 | Go to Step 44 |
37 | Inspect for poor connections at the harness connector of the heated/cool seat blower motor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 47 | Go to Step 45 |
38 | Inspect for poor connections at the harness connector of the HVAC control module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 47 | Go to Step 46 |
39 | Repair the short to ground or open in the battery positive voltage circuit of the climate control seat module. Refer to Wiring Repairs . Did you complete the repair? | -- | Go to Step 47 | -- |
40 | Repair the open in the ground circuit of the climate control seat module. Refer to Wiring Repairs . Did you complete the repair? | -- | Go to Step 47 | -- |
41 | Repair the open in the ignition 1 voltage circuit of the climate control seat module. Refer to Wiring Repairs . Did you complete the repair? | -- | Go to Step 47 | -- |
42 | Replace the heated/cool seat cushion ventilation module. Refer to Passenger Seat Cushion Ventilation Heating and Cooling Module Replacement or Driver Seat Cushion Ventilation Heating and Cooling Module Replacement . Did you complete the replacement? | -- | Go to Step 47 | -- |
43 | Replace the heated/cool seat back ventilation module. Refer to Driver Seat Back Ventilation Heating and Cooling Module Replacement or Passenger Seat Back Ventilation Heating and Cooling Module Replacement . Did you complete the replacement? | -- | Go to Step 47 | -- |
44 | Replace the climate control seat module. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 47 | -- |
45 | Replace the heated/cooled seat blower motor. Refer to Driver Seat Ventilation Heating and Cooling Blower Replacement or Passenger Seat Ventilation Heating and Cooling Blower Replacement . Did you complete the replacement? | -- | Go to Step 47 | -- |
46 | Replace the HVAC control module. Refer to HVAC Control Module Replacement for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 47 | -- |
47 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |
