Diagnostic Aids
The following conditions must be met in order to perform valid tests when diagnosing the climate control seat (CCS) system:
| • | The ignition must be cycled OFF then ON between each test in order to reset the climate control seat module (CCSM). |
| • | The engine must be running in order to supply the CCSM with the amount of current needed to operate the heated/cool seat system. |
With a short to ground in the heated/cool ventilation module COOL control circuit, the system will operate normally in the HEAT mode. However, when the COOL mode is selected, the short will open the HTDST fuse and the system will become inoperative.
With a short to ground in the heated/cool ventilation module HEAT control circuit, the system will operate normally in the COOL mode. However, when the HEAT mode is selected, the short will open HTDST fuse and the system will become inoperative.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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This step determines if the climate control seat module turns ON by using the current state of the blower motors. While performing this test, pay close attention to the blower motors because they may operate at a low RPM and for a short period of time. Listen for a low audible noise or feel for light air from the exhaust ducts of both blower motors.
-
This step determines the operation of the blower motors. While performing this test, pay close attention to the blower motors because they may operate at a low RPM and for a short period of time. Listen for a low audible noise or feel for light air from the exhaust ducts of both blower motors.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: Driver Seat Schematics or Passenger Seat Schematics Connector End View Reference: Power Seat Connector End Views | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
2 | Verify that the Heated/Cooled Seat Inoperative complaint is present. Attempt to operate the system in both the heat and cool modes. Does the heated/cool 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 heated/cool seat system operate in only the cool mode? | -- | Go to Step 6 | Go to Step 4 |
4 |
Does the Seat Cool Mode Switch parameter change state? | -- | Go to Step 9 | Go to Step 5 |
5 | Probe the switch supply voltage circuit of the heated/cooled seat switch with a test lamp that is connected to a good ground. Does the test lamp illuminate? | -- | Go to Step 7 | Go to Step 41 |
6 |
Does the Seat Heat Mode Switch parameter change state? | -- | Go to Step 18 | Go to Step 8 |
7 |
Does the Seat Cool Mode Switch parameter change state? | -- | Go to Step 46 | Go to Step 40 |
8 |
Does the Seat Heat Mode Switch parameter change state? | -- | Go to Step 46 | Go to Step 40 |
Does either one or both of the blower motors operate for approximately 4-60 seconds then shut down? | -- | Go to Step 10 | Go to Step 12 | |
Do both of the blower motors operate for approximately 4-60 seconds then shut down? | -- | Go to Step 16 | Go to Step 11 | |
11 | Does just the seat cushion blower operate for approximately 4-60 seconds then shut down? | -- | Go to Step 21 | Go to Step 20 |
12 | Measure the voltage from the battery positive voltage circuit of the climate control seat module to a good ground. Does the voltage measure within the specified range? | 9-16 V | Go to Step 13 | Go to Step 47 |
13 | Measure the voltage from the battery positive voltage circuit of the climate control seat module connector to the ground circuit of the climate control seat module. Does the voltage measure within the specified range? | 9-16 V | Go to Step 14 | Go to Step 48 |
14 |
Does the voltage measure within the specified range? | 9-16 V | Go to Step 15 | Go to Step 49 |
15 |
Does the measured voltage change state? | -- | Go to Step 24 | Go to Step 45 |
16 |
Important: If the resistance is measured with the seat still warm or cool, the resistance will vary. Allow the seat and/or the TED stabilize to room temperature before performing this test.
Does the resistance measure within the specified range? | 300 ohms-18K ohms | Go to Step 17 | Go to Step 30 |
17 |
Important: If the resistance is measured with the seat still warm or cool, the resistance will vary. Allow the seat and/or the TED stabilize to room temperature before performing this test.
Does the resistance measure within the specified range? | 300 ohms-18K ohms | Go to Step 32 | Go to Step 31 |
18 |
Important: If the resistance is measured with the seat still warm or cool, the resistance will vary. Allow the seat and/or the TED stabilize to room temperature before performing this test.
Does the resistance measure within the specified range? | 0.9-10.0 ohms | Go to Step 19 | Go to Step 34 |
19 |
Important: If the resistance is measured with the seat still warm or cool, the resistance will vary. Allow the seat and/or the TED stabilize to room temperature before performing this test. Measure the resistance between the heat control circuit and the cool control circuit of the seat back heated/cool ventilation module. Does the resistance measure within the specified range? | 0.9-10.0 ohms | Go to Step 44 | Go to Step 35 |
20 |
Does the voltage measure within the specified range? | 4-12 V | Go to Step 22 | Go to Step 26 |
21 |
Does the voltage measure within the specified range? | 4-12 V | Go to Step 23 | Go to Step 28 |
22 |
Does the voltage measure within the specified range? | 9-16 V | Go to Step 42 | Go to Step 36 |
23 |
Does the voltage measure within the specified range? | 9-16 V | Go to Step 43 | Go to Step 37 |
24 |
Does the voltage measure within the specified range? | 9-16 V | Go to Step 25 | Go to Step 38 |
25 |
Does the voltage measure within the specified range? | 9-16 V | Go to Step 44 | Go to Step 39 |
26 | Test the blower speed control circuit of the seat cushion blower motor 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 55 | Go to Step 27 |
27 | Test the low reference circuit of the seat cushion blower motor for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 55 | Go to Step 44 |
28 | Test the blower speed control circuit of the seat back blower motor 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 55 | Go to Step 29 |
29 | Test the low reference circuit of the seat back blower motor for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 55 | Go to Step 44 |
30 | Test the temperature sensor signal circuit and the low reference circuit of the seat cushion temperature sensor for a short to battery voltage and an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 55 | Go to Step 42 |
31 | Test the temperature sensor signal circuit and the low reference circuit of the seat back temperature sensor for a short to battery voltage and an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 55 | Go to Step 43 |
32 | Test the temperature sensor signal circuit of the seat cushion 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 55 | Go to Step 33 |
33 | Test the temperature sensor signal circuit of the seat back 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 55 | Go to Step 44 |
34 | Test the heat control circuit and the cool control circuit of the seat cushion heated/cool ventilation module for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 55 | Go to Step 42 |
35 | Test the heat control circuit and the cool control circuit of the seat back heated/cool ventilation module for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 55 | Go to Step 43 |
36 | Test the blower voltage reference circuit of the seat cushion blower motor for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 55 | Go to Step 44 |
37 | Test the blower voltage reference circuit of the seat back blower motor for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 55 | Go to Step 44 |
38 | Test the blower voltage reference circuit of the seat cushion blower motor 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 55 | Go to Step 44 |
39 | Test the blower voltage reference circuit of the seat back blower motor 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 55 | Go to Step 44 |
40 | Test the inoperative heat or cool switch signal circuit between the heated/cool seat switch and the door control module for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 55 | Go to Step 45 |
41 | Test the switch supply voltage circuit of the heated/cool 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 55 | Go to Step 45 |
42 | Inspect for poor connections at the harness connector of the heated/cool seat cushion ventilation 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 55 | Go to Step 50 |
43 | Inspect for poor connections at the harness connector of the heated/cool seat back ventilation 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 55 | Go to Step 51 |
44 | 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 in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 55 | Go to Step 52 |
45 | Inspect for poor connections at the harness connector of the door control 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 55 | Go to Step 53 |
46 | Inspect for poor connections at the harness connector of the heated/cool 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 55 | Go to Step 54 |
47 | Repair the short to ground or open in the battery positive voltage circuit of the climate control seat module. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 55 | -- |
48 | Repair the open in the ground circuit of the climate control seat module. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 55 | -- |
49 | Repair the open in the ignition 1 voltage circuit of the climate control seat module. Refer to Wiring Repairs in Wiring Systems. Did you complete the repair? | -- | Go to Step 55 | -- |
50 | Replace the heated/cool seat cushion ventilation module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 55 | -- |
51 | Replace the heated/cool seat back ventilation module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 55 | -- |
52 | Replace the climate control seat module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 55 | -- |
53 | Replace the door control module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? | -- | Go to Step 55 | -- |
54 | Replace the heated/cool seat switch. Refer to Heated and Cooled Seat Switch Replacement . Did you complete the replacement? | -- | Go to Step 55 | -- |
55 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |
